CN102616962A - Deep stage treatment method for industrial wastewater - Google Patents
Deep stage treatment method for industrial wastewater Download PDFInfo
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- CN102616962A CN102616962A CN2012100895794A CN201210089579A CN102616962A CN 102616962 A CN102616962 A CN 102616962A CN 2012100895794 A CN2012100895794 A CN 2012100895794A CN 201210089579 A CN201210089579 A CN 201210089579A CN 102616962 A CN102616962 A CN 102616962A
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Abstract
The invention discloses a deep stage treatment method for industrial wastewater. The method comprises the following steps of: 1, primarily reducing hardness, settling, and neutralizing; 2, filtering; 3, performing electro-adsorption to appropriately remove salt; and 4, performing reverse osmosis to deeply remove salt. According to deep stage treatment method for the industrial wastewater, the water quality application range is wide, a process can run stably, salt can be deeply removed by the method, and a small amount of sewage which is produced by a treatment system and meets the standard is discharged, and secondary pollution is avoided; and the treated industrial wastewater can be used as industrial circulating water, industrial circulating cooling water, and boiler water. The problems that a reverse osmosis membrane is easy to pollute, and reverse osmosis concentrated water which does not meet standard is discharged, and the problem of low running stability are solved; all the discharged sewage which is discharged meets the standard; and the produced water has various water qualities, and the recycling range is widened.
Description
Technical field
The present invention is a kind of trade effluent degree of depth hierarchical processing method.Belong to the waste water multiple-stage treatment.
Background technology
Waste water, sewage utilize through handling again, not only can the saves valuable water resources, and can reduce sewage discharge significantly, and the human physical environment of depending on for existence of protection, significant for the mankind's life with economic Sustainable development.
The contaminated degree of trade effluent is bigger, developed country generally with trade effluent in the production scene through simple process, the urban sewage treatment system that gets into very well equipped with handle after sewage mixes, independent reuse is actually rare in industrially developed country.
Trade effluent desalination Treatment for Reuse flow process is than municipal sewage treatment long flow path, generally adopts the flow process of reuse of secondary biochemical treatment-filtration-charcoal absorption-r-o--again.
In the prior art, refinery is the outer draining after up to standard with secondary biochemical treatment, and the recirculated cooling water moisturizing is done in reuse after flocculation sediment, filtration and germicidal treatment.Find through investigation, can adopt this technology, but, when advanced treatment and reclamation, must remove part or almost whole inorganic salt, could satisfy the requirement of reuse water for the higher trade effluent of salts contg for soft, low-corrosiveness, hyposaline sewage.
At present, desalination mode commonly used mainly contains: electrodialysis, r-o-, ion exchange method and electro-adsorption method.The electroosmose process easy scale formation, floor space is bigger, is mainly used in groundwater treatment at present, is used for the waste water treating and reutilizing aspect and also is not reported.
Reverse osmosis membrane requires very strict to influent quality, though desalination is comparatively thorough, film pollution, energy consumption are higher, and dense shipwreck is to reach emission standard.
Ion exchange method is more commonly used, is mainly used in clean water treatment, but to consume a large amount of acid, alkali carries out manipulation of regeneration; Ion exchange resin also is subject to the water Organic pollutants.
The electro-adsorption method requires wide to water inlet, certain contamination resistance is arranged, and non-secondary pollution is partial deionization technology, produces water and only is applicable to the recirculated cooling water moisturizing at present.
Chinese patent CN200520087169.1 discloses a kind of sewage water recycling and processing equipment.This patent adopts the electro-adsorption method to remove salt, partial organic substances in the sewage of biochemical treatment, and effluent reuse is in circulating water system.The water quality that this device is fit to is that specific conductivity is less than 2500 μ S/cm.When specific conductivity during greater than 2500 μ S/cm, tangible scaling tendency will appear in system, causes system's fluctuation of service, the frequent matting of needs, and effluent quality also is difficult to satisfy the circulating cooling make-up water water quality requirement simultaneously.
Chinese patent CN201010265113.6 discloses a kind of less energy-consumption waste water recycling preparation system.Adopt r-o----nanofiltration combination process reuse waste water,, concentrated organic dense water and had the problem that intractability is big, processing cost is high only to rejection to organics but there is not Degradation.
In sum, after secondary biochemical treatment, reach the outer draining of emission standard, the main processing technology that present advanced treatment and reclamation is adopted is reverse osmosis method desalination process and electro-adsorption method desalination process, and there is following technical problem in they:
1. r-o-deep desalting technology owned by France, desalination is comparatively thorough, and it is better to produce water water quality, but that this technology requires influent quality is comparatively strict, and reverse osmosis membrane is vulnerable to pollute, and especially when variation water quality, the steady running of reverse osmosis process is with influenced;
2, reverse osmosis desalination technology is when handling waste water, and organism can only concentrate and can not degrade in dense water side in the waste water, causes the reverse osmosis concentrated water organic content to surpass emission standard, produce secondary pollution, and the reverse osmosis concentrated water intractable is to emission standard;
3. electro-adsorption demineralization technology is when handling waste water, influent quality required lower, in desalination, organism had certain removal effect, but that it produces water water quality is poor than r-o-, belongs to appropriate desalination, and it produces water and can only be used as the recirculated cooling water moisturizing at present.The advantage of electro-adsorption demineralization technology is that the sewer organism is degraded by part, do not concentrate, but dense water qualified discharge.
Summary of the invention
The objective of the invention is to avoid above-mentioned weak point of the prior art, a kind of suitable water quality is wide in range, technology is stable and provide, can deep desalting, a small amount of sewage qualified discharge of producing of treatment system, do not produce secondary pollution; Trade effluent after treatment is applicable to the trade effluent degree of depth hierarchical processing method of industrial circulating water, industrial circulating cooling water, BW.
The object of the invention can reach through following measure:
Trade effluent degree of depth hierarchical processing method of the present invention; It is characterized in that said advanced treatment apparatus is connected, is composited with reverse osmosis advanced desalination unit sequencing by preliminary reduction hardness operating unit, high efficiency filter operating unit, electro-adsorption appropriateness desalination unit; Wherein, Electro-adsorption appropriateness desalination unit output water reaches the industrial circulate water standard, and reverse osmosis advanced desalination unit output water quality reaches the BW standard; Treatment process comprises the steps:
1.. tentatively reduce hardness, deposition, neutralization
Pending trade effluent at first gets into the preliminary hardness operating unit that reduces, and adds alkaline matter, and hybrid reaction under agitation reduces sedimentation after the hardness, removes throw out; Waste water neutralizes with acidic substance, is equipped with to filter; Processing condition are following:
2.. filter
Trade effluent after 1. step is handled gets into the high efficiency filter operating unit, after the reaction of adding flocculation agent, adds sterilant again, through filtering, removes the suspended substance in the waste water, is equipped with appropriate desalination; Processing condition are following:
Flocculant addition mg/L 0～50
Flocculation reaction time min 5～30
Sterilant add-on mg/L 0～20
3.. electro-adsorption appropriateness desalination
Through the 2. trade effluent of filtration treatment of step, get into electro-adsorption appropriateness desalination unit, processing condition are following:
The mould of electro-adsorption module is to WV V 1.0～1.8
Desalination working hour min 20～100
Regeneration backwash time min 20～100
After product water reached the reuse water quality standard, an output water part was sent to the industrial circulate water water reservoir, and another part gets into reverse osmosis advanced desalination unit; Regeneration sewer qualified discharge;
4.. reverse osmosis advanced desalination
From the trade effluent behind the 3. appropriate desalination of step, get into reverse osmosis advanced desalination unit behind adding Scale inhibitors, the reductive agent, processing condition are following:
The ratio % 0～100 of reverse osmosis advanced desalination cell processing electro-adsorption appropriateness desalination output water
Producing water ratio % 20～80
Output water is sent to water storage tank on the boiler of feeding, and dense water returns the high efficiency filter operating unit, mixes with trade effluent after 1. step is handled, gets into step together 2., continues to participate in handling.
It is the metals ion fouling in follow-up desalination treatment unit that prevents in the sewage that the present invention is provided with the unitary purpose of preliminary reduction hardness, influences the continous-stable operation of desalting system.In the high efficiency filter unit, the suspended substance that tentatively reduces in the hardness unit output water further to be handled, purpose is to eliminate the influence of suspended substance to the operation of desalination plant continous-stable.In the electro-adsorption demineralization unit, high efficiency filter unit output water to be carried out desalination handle, purpose is that part is removed the zwitterion in the water, makes it to reach the circulating cooling make-up water water quality requirement; Simultaneously, there is certain Degradation electro-adsorption appropriateness desalination unit to organism, and electro-adsorption product water is low than entering organic matter of water concentration, and saltiness is low, and especially hardness is low, can alleviate the unitary film of reverse osmosis advanced desalination greatly and pollute, and makes the reverse osmosis unit operation more stable.
Electro-adsorption demineralization is to utilize charging electrode surface adsorption water intermediate ion and electrically charged particle; Make that dissolved salts and other charged contaminants concentrate and the implementation part desalination in the electrode surface enrichment in the water; Therefore have the influent quality requirement low, stable, energy consumption is low, long service life, maintenance of the equipment simply, do not produce characteristics such as secondary pollution.In reverse osmosis advanced desalination unit electro-adsorption is produced the further desalting treatment of water; The water quality of output water can reach the BW standard, and dense water returns the high efficiency filter operating unit, mixes with trade effluent after 1. step is handled; Get into step together 2., continue to participate in handling.But electro-adsorption regeneration sewer qualified discharge.
More than four operating units have complementary advantages, cooperation, accomplished task of the present invention jointly.
The object of the invention can also reach through following measure:
Trade effluent degree of depth hierarchical processing method of the present invention, step 1. described in processing condition following:
It is optimized technical scheme.
Trade effluent degree of depth hierarchical processing method of the present invention is characterized in that processing condition described in step is 1. are following:
It is preferred technical scheme.
Trade effluent degree of depth hierarchical processing method of the present invention, step 1. described in alkaline matter be in sodium hydroxide, unslaked lime, the calcium hydroxide any one; Said acidic substance are sulfuric acid or hydrochloric acid.
Trade effluent degree of depth hierarchical processing method of the present invention, step stir to adopt any one in air blast stirring, mechanical stirring or the pipeline alr mode described in 1.; Said deposition is any one perhaps its any two or more combinations in natural sedimentation, inclined plate sedimentation, the flocculating settling.
It is any one or its any two or more combinations in sand filtration, fiber filter, lamination filtration, micro-filtration, the ultrafiltration that trade effluent degree of depth hierarchical processing method of the present invention, step filter described in 2..
Trade effluent degree of depth hierarchical processing method of the present invention, step 2. described in processing condition following:
Flocculant addition mg/L 0～30
Flocculation reaction time min 5～20
Sterilant add-on mg/L 0～10.
It is optimized technical scheme.
Trade effluent degree of depth hierarchical processing method of the present invention, step 2. described in sterilant be in chlorine, dioxide peroxide, Youxiaolin, the ozone any one.
Trade effluent degree of depth hierarchical processing method of the present invention, step is 3.. described in electro-adsorption appropriateness desalination process condition following:
The mould of electro-adsorption module is to WV V 1.2～1.6
Desalination working hour min 30～60
Regeneration backwash time min 30～60.
It is optimized technical scheme.
Trade effluent degree of depth hierarchical processing method of the present invention, step 3. described in electro-adsorption appropriateness desalination unit, its module operation scheme is the array configuration of the above series, parallel of single-stage, two-stage or series connection-parallel connection.
Trade effluent degree of depth hierarchical processing method of the present invention, step 4. described in processing condition be:
The ratio % 20～100 of reverse osmosis advanced desalination cell processing electro-adsorption appropriateness desalination output water
Producing water ratio % 50～75.
It is optimized technical scheme.
Trade effluent degree of depth hierarchical processing method of the present invention, step 4. described in Scale inhibitors FLOCON 260 preferably, add-on is 3～7mg/L.
Trade effluent degree of depth hierarchical processing method of the present invention, step 4. described in reductive agent sodium sulfite anhy 96 preferably, add-on is 1～4mg/L.
Trade effluent degree of depth hierarchical processing method of the present invention is characterized in that after treatment output water is applicable to industrial circulate water, BW and requires to mix the mixing water that gets with arbitrary proportion by the output water of above two kinds of specifications according to reuse technology.
The technical scheme of requirement protection of the present invention has produced following beyond thought technique effect:
1. provide that a kind of suitable water quality is wide in range, technology is stable, can deep desalting, a small amount of sewage qualified discharge of producing of treatment system, do not contain the generation secondary pollution; Trade effluent after treatment is applicable to the trade effluent degree of depth hierarchical processing method of industrial circulating water, industrial circulating cooling water, BW.
2. utilize the electro-adsorption demineralization technology characteristics lower to the influent quality requirement; At first handle trade effluent; After the organism of electro-adsorption product water and salts contg were all stable, part was as the water inlet of reverse osmosis process, when having solved reverse osmosis process processing industrial sewage; Film is prone to pollute the problem of fluctuation of service;
3. utilize electro-adsorption demineralization technology in desalination, organism to be had the characteristics of certain removal effect, reverse osmosis concentrated water secondary treatment that can not qualified discharge has solved the problem that reverse osmosis concentrated water can not qualified discharge.The dense water of electro-adsorption demineralization technology can qualified discharge, and therefore, the externally discharged waste water of a whole set of technology can qualified discharge;
4. the present invention produces water has the electro-adsorption of reverse osmosis produced water and the partial deionization of deep desalting to produce water, two kinds produce water can be separately or mix and supply water by reuse requirements, it is diversified to produce water water quality, has widened the reuse scope.
Description of drawings
Fig. 1 is the process flow diagram of trade effluent degree of depth hierarchical processing method of the present invention
Among the figure
1 trade effluent
2 alkali
The 3 preliminary hardness operating units that reduce
4 acid
5 neutralization tanks
6 high efficiency filter operating units
7 electro-adsorption appropriateness desalination unit
8 reverse osmosis concentrated waters
9 electro-adsorption produce the pond
10 Scale inhibitorss, reductive agent
11 reverse osmosis advanced desalination unit
12 reverse osmosis produced water outlets
13 electro-adsorption sewers
14 electro-adsorption output water
Embodiment
The present invention below will combine embodiment to make further detailed description:
Embodiment 1
Adopt technical scheme of the present invention to handle the chemical engineering sewage of qualified discharge, influent quality is specific conductivity 3000 μ S/cm, COD30mg/L, hardness 900mg/L (in lime carbonate).Preliminary reduction hardness alkaline matter that operating unit adds is a sodium hydroxide, and the pH value is controlled to be 10.5, and alr mode is that air blast is stirred, and the hybrid reaction time is 20min, and the throw out removing method of generation is an inclined plate sedimentation, and the settling time is 4h; The acidic substance that neutralization reaction adds are sulfuric acid, and the pH value is controlled to be 6.8, and the neutralization reaction time is 10min.Preliminary reduction hardness operating unit effluent quality is specific conductivity 2800 μ S/cm, hardness 200mg/L (in lime carbonate).High efficiency filter operating unit filter type is that lamination filters, and filtering accuracy is 20 μ m, does not add flocculation agent, sterilant.The module operation scheme is a two-stage series connection in the electro-adsorption appropriateness desalination plant, and it is 1.2V that every counter electrode adds piezoelectric voltage, working hour 34min, backwash time 34min.It is 20% that reverse osmosis advanced desalination plant is handled the ratio of producing water in electro-adsorption appropriateness desalination unit, and Scale inhibitors FLOCON260 adds concentration 5mg/L, and the reductive agent sodium sulfite anhy 96 adds concentration 2.5mg/L, the unitary producing water ratio 75% of reverse osmosis advanced desalination.Electro-adsorption appropriateness desalination unit produces water conductivity 1000 μ S/cm, COD 20mg/L; The unitary product water conductivity 40 μ S/cm of reverse osmosis advanced desalination, COD does not detect; Sewer COD 30mg/L.
Embodiment 2
Adopt technical scheme of the present invention to handle the chemical engineering sewage of qualified discharge, influent quality is specific conductivity 5000 μ S/cm, COD45mg/L, hardness 1000mg/L (in lime carbonate).Preliminary reduction hardness alkaline matter that operating unit adds is a sodium hydroxide, and the pH value is controlled to be 12.0, and alr mode is that air blast is stirred, and the hybrid reaction time is 10min, and the throw out removing method of generation is a natural subsidence, and the settling time is 6h; The acidic substance that neutralization reaction adds are sulfuric acid, and the pH value is controlled to be 7.0, and the time of neutralization reaction is 10min.Preliminary reduction hardness operating unit effluent quality is specific conductivity 4600 μ S/cm, hardness 100mg/L (in lime carbonate).High efficiency filter operating unit filter type is sand filtration+fiber filter combination, does not add flocculation agent, sterilant.The module operation scheme is a two-stage series connection in the electro-adsorption appropriateness desalination plant, and it is 1.6V that every counter electrode adds piezoelectric voltage, working hour 34min, backwash time 34min.It is 50% that reverse osmosis advanced desalination plant is handled the ratio of producing water in the electro-adsorption unit, and Scale inhibitors FLOCON260 adds concentration 5mg/L, and the reductive agent sodium sulfite anhy 96 adds concentration 2.5mg/L, reverse osmosis produced water rate 50%.The unitary product water conductivity 1100 μ S/cm of electro-adsorption appropriateness desalination, COD 28mg/L; Reverse osmosis advanced desalination unit produces water conductivity 55 μ S/cm, and COD does not detect; Sewer COD 42mg/L.
Adopt technical scheme of the present invention to handle the chemical engineering sewage of qualified discharge, influent quality is specific conductivity 5000 μ S/cm, COD45mg/L, hardness 1000mg/L (in lime carbonate).Preliminary reduction hardness alkaline matter that operating unit adds is a sodium hydroxide, and the pH value is controlled to be 8.5, and alr mode is a mechanical stirring, and the hybrid reaction time is 30min, and the throw out removing method of generation is an inclined plate sedimentation, and the settling time is 8h; The acidic substance that neutralization reaction adds are sulfuric acid, and the pH value is controlled to be 7.0, and the time of neutralization reaction is 30min.Preliminary reduction hardness operating unit effluent quality is specific conductivity 4850 μ S/cm, hardness 500mg/L (in lime carbonate).High efficiency filter operating unit filter type is that sand filtration+lamination filters combination, adds the polymeric ferric aluminum flocculation agent before the sand filtration, and concentration is 50mg/L, flocculation reaction time 15min.The module operation scheme is a two-stage series connection in the electro-adsorption appropriateness desalination plant, and it is 1.5V that every counter electrode adds piezoelectric voltage, working hour 20min, backwash time 40min.It is 50% that reverse osmosis advanced desalination plant is handled the ratio of producing water in the electro-adsorption unit, and Scale inhibitors FLOCON260 adds concentration 5mg/L, and the reductive agent sodium sulfite anhy 96 adds concentration 2.5mg/L, reverse osmosis advanced desalination unit producing water ratio 66%.Electro-adsorption appropriateness desalination produces water conductivity 1200 μ S/cm, COD29mg/L; The unitary product water conductivity 62 μ S/cm of reverse osmosis advanced desalination, COD does not detect; Sewer COD 44mg/L.
Embodiment 4
Adopt technical scheme of the present invention to handle the chemical engineering sewage of qualified discharge, influent quality is specific conductivity 3800 μ S/cm, COD40mg/L, hardness 700mg/L (in lime carbonate).Preliminary reduction hardness alkaline matter that operating unit adds is a sodium hydroxide, and the pH value is controlled to be 10.5, and alr mode is that air blast is stirred, and the hybrid reaction time is 10min, and the throw out removing method of generation is an inclined plate sedimentation, and the settling time is 4h; The acidic substance that neutralization reaction adds are sulfuric acid, and the pH value is controlled to be 8.0, and the time of neutralization reaction is 5min.Preliminary reduction hardness operating unit effluent quality is specific conductivity 3700 μ S/cm, hardness 240mg/L (in lime carbonate).The filter type of high efficiency filter operating unit is that sand filtration+lamination filters combination, adds the polymeric ferric aluminum flocculation agent before the sand filtration, and concentration is 20mg/L, flocculation reaction time 5min.The module operation scheme is a two-stage parallel connection in the electro-adsorption appropriateness desalination plant, and it is 1.4V that every counter electrode adds piezoelectric voltage, working hour 40min, backwash time 40min.It is 50% that reverse osmosis advanced desalination plant is handled the ratio of producing water in electro-adsorption appropriateness desalination unit, and Scale inhibitors FLOCON260 adds concentration 5mg/L, and the reductive agent sodium sulfite anhy 96 adds concentration 2.5mg/L, the unitary producing water ratio 75% of reverse osmosis advanced desalination.The unitary product water conductivity 1200 μ S/cm of electro-adsorption appropriateness desalination, COD 30mg/L; The unitary product water conductivity 55 μ S/cm of reverse osmosis advanced desalination, COD does not detect; Sewer COD 40mg/L.
Embodiment 5
Adopt technical scheme of the present invention to handle the chemical engineering sewage of qualified discharge, influent quality is specific conductivity 4000 μ S/cm, COD40mg/L, hardness 900mg/L (in lime carbonate).Preliminary reduction hardness alkaline matter that operating unit adds is a sodium hydroxide, and the pH value is controlled to be 10.8, and alr mode is that air blast is stirred, and the hybrid reaction time is 5min, and the throw out removing method of generation is an inclined plate sedimentation, and the settling time is 4h; The acidic substance that neutralization reaction adds are sulfuric acid, and the pH value is controlled to be 6.5, and the time of neutralization reaction is 10min.Preliminary reduction hardness operating unit effluent quality is specific conductivity 3700 μ S/cm, hardness 200mg/L (in lime carbonate).The filter type of high efficiency filter operating unit is that sand filtration+lamination filters combination, adds the polymeric ferric aluminum flocculation agent before the sand filtration, and concentration is 10mg/L, and flocculation reaction time 30min, sterilant are Youxiaolin, and concentration is 5mg/L.The module operation scheme is a two-stage series connection in the electro-adsorption appropriateness desalination plant, and it is 1.5V that every counter electrode adds piezoelectric voltage, working hour 34min, backwash time 34min.It is 50% that reverse osmosis advanced desalination plant is handled the ratio of producing water in electro-adsorption appropriateness desalination unit, and Scale inhibitors FLOCON260 adds concentration 5mg/L, and the reductive agent sodium sulfite anhy 96 adds concentration 2.5mg/L, the unitary producing water ratio 66% of reverse osmosis advanced desalination.The unitary product water conductivity 1000 μ S/cm of electro-adsorption appropriateness desalination, COD 25mg/L; The unitary product water conductivity 30 μ S/cm of reverse osmosis advanced desalination, COD does not detect; Sewer COD 36mg/L.
Adopt technical scheme of the present invention to handle certain contaminated underground water, influent quality is specific conductivity 2500 μ S/cm, COD25mg/L, hardness 800mg/L (in lime carbonate).Preliminary reduction hardness alkaline matter that operating unit adds is a sodium hydroxide, and the pH value is controlled to be 102, and alr mode is a mechanical stirring, and the hybrid reaction time is 10min, and the throw out removing method of generation is a natural subsidence, and the settling time is 6h; The acidic substance that neutralization reaction adds are sulfuric acid, and the pH value is controlled to be 6.5, and the time of neutralization reaction is 10min.Preliminary reduction hardness operating unit effluent quality is specific conductivity 2350 μ S/cm, hardness 300mg/L (in lime carbonate).The filter type of high efficiency filter operating unit is that sand filtration+lamination filters combination, adds the polymeric ferric aluminum flocculation agent before the sand filtration, and concentration is 10mg/L, flocculation reaction time 30min; Sterilant is a Youxiaolin, and concentration is 10mg/L.The module operation scheme is a two-stage series connection in the electro-adsorption appropriateness desalination plant, and it is 1.8V that every counter electrode adds piezoelectric voltage, working hour 60min, backwash time 60min.It is 50% that reverse osmosis advanced desalination plant is handled the ratio of producing water in the electro-adsorption unit, and Scale inhibitors FLOCON260 adds concentration 5mg/L, and the reductive agent sodium sulfite anhy 96 adds concentration 2.5mg/L, reverse osmosis produced water rate 66%.The unitary product water conductivity 700 μ S/cm of electro-adsorption appropriateness desalination, COD 15mg/L; The unitary product water conductivity 25 μ S/cm of reverse osmosis advanced desalination, COD does not detect; Sewer COD 23mg/L.
Embodiment 7
Adopt technical scheme of the present invention to handle certain contaminated underground water, influent quality is specific conductivity 2000 μ S/cm, COD25mg/L, hardness 500mg/L (in lime carbonate).Preliminary reduction hardness alkaline matter that operating unit adds is a sodium hydroxide, and the pH value is controlled to be 10.5, and alr mode is that air blast is stirred, and the hybrid reaction time is 15min, and the throw out removing method of generation is an inclined plate sedimentation, and the settling time is 1.5h; The acidic substance that neutralization reaction adds are sulfuric acid, and the pH value is controlled to be 5.0, and the time of neutralization reaction is 10min.Preliminary reduction hardness operating unit effluent quality is specific conductivity 1850 μ S/cm, hardness 250mg/L (in lime carbonate).The filter type of high efficiency filter operating unit is sand filtration+fiber filter combination, adds the polymeric ferric aluminum flocculation agent before the sand filtration, and concentration is 10mg/L, flocculation reaction time 30min; Sterilant is a Youxiaolin, and concentration is 10mg/L.The module operation scheme is a two-stage series connection in the electro-adsorption appropriateness desalination plant, and it is 1.4V that every counter electrode adds piezoelectric voltage, working hour 100min, backwash time 100min.It is 100% that reverse osmosis advanced desalination plant is handled the ratio of producing water in the electro-adsorption unit, and Scale inhibitors FLOCON260 adds concentration 5mg/L, and the reductive agent sodium sulfite anhy 96 adds concentration 2.5mg/L, the unitary producing water ratio 75% of reverse osmosis advanced desalination.The unitary product water conductivity 900 μ S/cm of electro-adsorption appropriateness desalination, COD 20mg/L; Reverse osmosis produced water conductivity 25 μ S/cm, COD does not detect; Sewer COD 30mg/L.
Comparative example:
The present invention below will combine the comparative example of embodiment 5 to do further to detail:
Comparative example 1
Adopt technical scheme of the present invention to handle the chemical engineering sewage of qualified discharge, influent quality is specific conductivity 4000 μ S/cm, COD40mg/L, hardness 900mg/L (in lime carbonate).Preliminary reduction hardness alkaline matter that operating unit adds is a sodium hydroxide, and the pH value is controlled to be 10.8, and alr mode is that air blast is stirred, and the time range of hybrid reaction is 5min, and the throw out removing method of generation is an inclined plate sedimentation, and the settling time scope is 4h; The acidic substance that neutralization reaction adds are sulfuric acid, and the pH value is controlled to be 6.5, and the time of neutralization reaction is 10min.Preliminary reduction hardness operating unit effluent quality is specific conductivity 3700 μ S/cm, hardness 200mg/L (in lime carbonate).The filter type of high efficiency filter operating unit is that sand filtration+lamination filters combination, adds the polymeric ferric aluminum flocculation agent before the sand filtration, and concentration is 10mg/L, flocculation reaction time 30min; Sterilant is a Youxiaolin, and concentration is 5mg/L.Electro-adsorption appropriateness desalination plant is not set.Reverse osmosis advanced desalination plant Scale inhibitors FLOCON260 adds concentration 5mg/L, and the reductive agent sodium sulfite anhy 96 adds concentration 2.5mg/L, reverse osmosis produced water rate 66%, and reverse osmosis produced water conductivity 62 μ S/cm, COD does not detect; Sewer COD 118mg/L.
Comparative example 2
Adopt technical scheme of the present invention to handle the chemical engineering sewage of qualified discharge, influent quality is specific conductivity 4000 μ S/cm, COD40mg/L, hardness 900mg/L (in lime carbonate).Preliminary reduction hardness alkaline matter that operating unit adds is a sodium hydroxide, and the pH value is controlled to be 10.8, and alr mode is that air blast is stirred, and the time range of hybrid reaction is 5min, and the throw out removing method of generation is an inclined plate sedimentation, and the settling time scope is 4h; The acidic substance that neutralization reaction adds are sulfuric acid, and the pH value is controlled to be 6.5, and the time of neutralization reaction is 10min.Preliminary reduction hardness operating unit effluent quality is specific conductivity 3700 μ S/cm, hardness 200mg/L (in lime carbonate).The filter type of high efficiency filter operating unit is that sand filtration+lamination filters combination, adds the polymeric ferric aluminum flocculation agent before the sand filtration, and concentration is 10mg/L, flocculation reaction time 30min; Sterilant is a Youxiaolin, and concentration is 5mg/L.The module operation scheme is a two-stage series connection in the electro-adsorption appropriateness desalination plant, and it is 1.5V that every counter electrode adds piezoelectric voltage, working hour 34min, backwash time 34min.Reverse osmosis advanced desalination plant is not set, and electro-adsorption produces water conductivity 1050 μ S/cm, COD23mg/L; Sewer COD 32mg/L.
Claims (14)
1. the trade effluent degree of depth and hierarchical processing method; It is characterized in that said advanced treatment apparatus is connected, is composited with reverse osmosis advanced desalination unit sequencing by preliminary reduction hardness operating unit, high efficiency filter operating unit, electro-adsorption appropriateness desalination unit; Wherein, Electro-adsorption appropriateness desalination unit output water reaches the industrial circulate water standard, and reverse osmosis advanced desalination unit output water quality reaches the BW standard; Treatment process comprises the steps:
1.. tentatively reduce hardness, deposition, neutralization
Pending trade effluent at first gets into the preliminary hardness operating unit that reduces, and adds alkaline matter, and hybrid reaction under agitation reduces sedimentation after the hardness, removes throw out; Waste water neutralizes with acidic substance, is equipped with to filter; Processing condition are following:
2.. filter
Trade effluent after 1. step is handled gets into the high efficiency filter operating unit, after the reaction of adding flocculation agent, adds sterilant again, through filtering, removes the suspended substance in the waste water, is equipped with appropriate desalination; Processing condition are following:
Flocculant addition mg/L 0～50
Flocculation reaction time min 5～30
Sterilant add-on mg/L 0～20
3.. electro-adsorption appropriateness desalination
Through the 2. trade effluent of filtration treatment of step, get into electro-adsorption appropriateness desalination unit, processing condition are following:
The mould of electro-adsorption module is to WV V 1.0～1.8
Desalination working hour min 20～100
Regeneration backwash time min 20～100
After product water reached the reuse water quality standard, an output water part was sent to the industrial circulate water water reservoir, and another part gets into reverse osmosis advanced desalination unit; Regeneration sewer qualified discharge;
4.. reverse osmosis advanced desalination
From the trade effluent behind the 3. appropriate desalination of step, get into reverse osmosis advanced desalination unit behind adding Scale inhibitors, the reductive agent, processing condition are following:
The ratio % 0～100 of reverse osmosis advanced desalination cell processing electro-adsorption appropriateness desalination output water
Producing water ratio % 20～80
Output water is sent to water storage tank on the boiler of feeding, and dense water returns the high efficiency filter operating unit, mixes with trade effluent after 1. step is handled, gets into step together 2., continues to participate in handling.
2. according to the trade effluent degree of depth hierarchical processing method of claim 1, it is characterized in that processing condition described in step is 1. are following:
3. according to the trade effluent degree of depth hierarchical processing method of claim 1, it is characterized in that processing condition described in step is 1. are following:
4. according to the trade effluent degree of depth hierarchical processing method of claim 1, it is characterized in that alkaline matter described in step 1. is any one in sodium hydroxide, unslaked lime, the calcium hydroxide; Said acidic substance are sulfuric acid or hydrochloric acid.
5. according to the trade effluent degree of depth hierarchical processing method of claim 1, it is characterized in that stirring described in step 1. and adopt in air blast stirring, mechanical stirring or the pipeline alr mode any one; Said deposition is any one perhaps its any two or more combinations in natural sedimentation, inclined plate sedimentation, the flocculating settling.
6. according to the trade effluent degree of depth hierarchical processing method of claim 1, it is characterized in that filtering described in step 2. is any one perhaps its any two or more combinations in sand filtration, fiber filter, lamination filtration, micro-filtration, the ultrafiltration.
7. according to the trade effluent degree of depth hierarchical processing method of claim 1, it is characterized in that processing condition described in step is 2. are following:
Flocculant addition mg/L 0～30
Flocculation reaction time min 5～20
Sterilant add-on mg/L 0～10.
8. according to the trade effluent degree of depth hierarchical processing method of claim 1, it is characterized in that sterilant described in step 2. is any one in chlorine, dioxide peroxide, Youxiaolin, the ozone.
9. according to the trade effluent degree of depth hierarchical processing method of claim 1, it is characterized in that step is 3.. described in electro-adsorption appropriateness desalination process condition following:
The mould of electro-adsorption module is to WV V 1.2～1.6
Desalination working hour min 30～60
Regeneration backwash time min 30～60.
10. according to the trade effluent degree of depth hierarchical processing method of claim 1, it is characterized in that electro-adsorption appropriateness desalination unit described in step is 3., its module operation scheme is the array configuration of the above series, parallel of single-stage, two-stage or series connection-parallel connection.
11., it is characterized in that processing condition are described in step is 4. according to the trade effluent degree of depth hierarchical processing method of claim 1:
The ratio % 20～100 of reverse osmosis advanced desalination cell processing electro-adsorption appropriateness desalination output water
Producing water ratio % 50～75.
12. according to the trade effluent degree of depth hierarchical processing method of claim 1, it is characterized in that Scale inhibitors is FLOCON 260 described in step 4., add-on is 3～7mg/L.
13. according to the trade effluent degree of depth hierarchical processing method of claim 1, it is characterized in that reductive agent is a sodium sulfite anhy 96 described in step 4., add-on is 1～4mg/L.
14., it is characterized in that after treatment output water is applicable to industrial circulate water, BW and requires to mix the mixing water that gets with arbitrary proportion by the output water of above two kinds of specifications according to reuse technology according to the trade effluent degree of depth hierarchical processing method of claim 1.
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