CN105060642A - Sewage treatment method and system used for enhancing phosphorus and nitrogen removal and based on sludge carbon source circulation - Google Patents
Sewage treatment method and system used for enhancing phosphorus and nitrogen removal and based on sludge carbon source circulation Download PDFInfo
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Abstract
The invention discloses a sewage treatment method and system for enhancing phosphorus and nitrogen removal and based on sludge carbon source circulation in order to solve the problem of low phosphorus and nitrogen removal efficiency caused by shortage of feedwater carbon source in a conventional sewage treatment plant. The system comprises a mainstream sewage treatment system with phosphorus and nitrogen removal functions and a sidestream sludge carbon source circulation system, wherein the mainstream sewage treatment system comprises a grit basin, a biological phosphorus and nitrogen removal tank and a secondary sedimentation tank; the sidestream sludge carbon source circulation system comprises a sludge inorganic matter separator, a sludge carbon sourcing tank and a sludge dehydration system. According to the method and the system, the sidestream sludge carbon source circulation system is embedded on the basis of a traditional phosphorus and nitrogen removal technology, and enhanced hydrolytic acidification is performed on most residual sludge, so that a solid carbon source is converted into a dissolved-state easily-degradable carbon source substance such as VFAs (volatile fatty acids); the dissolved-state easily-degradable carbon source substance is then taken as a supplemented carbon source to flow to the biological phosphorus and nitrogen removal tank, accordingly, competition of denitrifying bacteria and phosphorus-accumulating bacteria for the carbon source is relieved, and the biological phosphorus and nitrogen removal efficiency is improved; meanwhile, the sludge carbon source is recycled.
Description
Technical field
The invention belongs to technical field of sewage, relate to a kind of reinforced phosphor-removing denitrifying sewage water treatment method based on sludge carbon source circulation and system.
Background technology
In recent years, due to the continuous increase of China's urban drainage system imperfection and the daily water yield of resident, the situation of China's municipal wastewater treatment plant ubiquity water-inlet carbon source deficiency is caused.The shortage of carbon source directly exacerbates denitrifying bacteria and polyP bacteria to the competition of carbon source, thus causes that biological dephosphorize denitrification effect is poor and effluent quality is not up to standard.In order to ensure that stable effluent quality is up to standard, most of sewage work has to improve biological dephosphorize denitrification efficiency by the mode adding outer carbon source (as: methyl alcohol, glucose, ethanol etc.).Although this mode can realize stable water outlet effect up to standard, the working cost of sewage work can be added greatly because a large amount of outer carbon sources need be added, thus increase the weight of its economical load run.
As the inevitable outcome of sewage work---although excess sludge, containing a large amount of organism, is often taken as offal treatment, not only increases processing cost, also result in the waste of resource simultaneously.
Therefore develop a kind of reinforced phosphor-removing denitrifying Sewage treatment systems based on sludge carbon source recycle for the problem of current municipal wastewater treatment plant carbon source deficiency and method significant.
Summary of the invention
For prior art above shortcomings, the object of the present invention is to provide a kind of reinforced phosphor-removing denitrifying sewage water treatment method based on sludge carbon source circulation and system.
To achieve these goals, the technical solution used in the present invention is as follows:
Based on a reinforced phosphor-removing denitrifying sewage water treatment method for sludge carbon source recycle, operate according to the following steps:
1) after sewage being carried out the separation of sand water, the sewage separated is imported biological dephosphorize denitrification pond, make it to run to realize denitrogenation, dephosphorization and organic removal according to the mode of anaerobic-anoxic-oxic, the oxygen needed for the nutrition in microbial decomposition sewage is provided by biological dephosphorize denitrification pond aerating system; The sewage completing biological dephosphorize denitrification is completed mud-water separation by precipitation, the water purification after process is discharged; The front end that the mud a precipitated part is back to biological dephosphorize denitrification pond is formed returned sluge, and another part is then as excess sludge;
2) inert inorganic matter in the excess sludge described in step 1) is separated, and then form the lower underflow mud of organic content and the higher overflow sludge of organic content; After underflow mud carries out processed, outward transport after making its water ratio that dewaters be less than 80%;
3) by step 2) described in overflow sludge make organic matter wherein be the easy degraded carbon source of solubilised state from solid-state difficult degradation organic matter transformation by enhanced hydrolysis acidification technique, and promote the conversion of voltaile fatty acid, and then form carbon source phegma; This carbon source phegma is back to the front end in biological dephosphorize denitrification pond; Realize the recycle of sludge carbon source.
In order to the treatment effect making aforesaid method reach good, the sludge concentration of the overflow sludge described in step 3) answers >=10000mg/L, and in mud, organic content answers >=40%; The time that this overflow sludge carries out enhanced hydrolysis acidifying is no less than one day, carries out the ORP≤50mv of the reaction environment of enhanced hydrolysis acidifying.
Further, as required, using the 4-10%(mass ratio of the precipitated mud described in step 1)) as excess sludge.
Based on the reinforced phosphor-removing denitrifying Sewage treatment systems of sludge carbon source recycle, comprise main flow Sewage treatment systems and the effluent sludge carbon source recycle system:
Described main flow Sewage treatment systems comprises settling pit, biological dephosphorize denitrification pond and second pond, and described settling pit is provided with water inlet pipe, and for being introduced by sewage, this settling pit is communicated with described biological dephosphorize denitrification pond by settling pit rising pipe; Described biological dephosphorize denitrification pond is provided with aerating system, and for aeration, this biological dephosphorize denitrification pond is communicated with described second pond by mixed solution delivery pipe; Described second pond is provided with rising pipe, mud return line and excess sludge discharge pipe for discharging the rear water purification of process; Described mud return line one end is communicated with second pond, and the other end is communicated with the front end in biological dephosphorize denitrification pond, for by activity sludge reflux; Described excess sludge discharge pipe one end is communicated with second pond, and the other end is communicated with the effluent sludge carbon source recycle system, for mud is entered the sludge carbon source recycle system.
When biological dephosphorize denitrification pond needs outer throwing carbon source, start the effluent sludge carbon source recycle system and carry out benefit carbon.
The described effluent sludge carbon source recycle system comprises mud inorganics separator, sludge carbon source pond and sludge dewatering system; Described excess sludge discharge pipe is communicated with mud inorganics separator; Described mud inorganics separator is communicated with described sludge carbon source pond by overflow sludge delivery pipe, is communicated with described sludge dewatering system by underflow mud discharging pipe; Sludge carbon source pond is communicated with the front end in biological dephosphorize denitrification pond by sludge carbon source return line.
Further, described biological dephosphorize denitrification pond can be A
2/ O biochemical reaction tank, oxidation ditch and its develop the facility that technique etc. has denitrogenation, dephosphorization and organics removal function.
Further, in order to regulate the sludge quantity entering the effluent sludge carbon source recycle system, described excess sludge discharge pipe 12 is provided with variable valve.
Compared with prior art, the present invention has following beneficial effect:
1, the inert inorganic matter comprised in excess sludge can be separated by mud inorganics separator, reaches the object improving excess sludge organic content, thus improves sludge carbon source efficiency.
2, excess sludge carbon source is made by measures such as enhanced hydrolysis acidifyings, be that system internal carbon source is back in main flow sewage treatment process system with sludge carbon source, not only can alleviate the carbon source competition of anaerobic phosphorus release and anoxic denitrification, improve the efficiency of Sewage treatment systems denitrogenation dephosphorizing, ensure effluent quality.Resource utilization and the sludge carbon source recycle of excess sludge can also be realized, avoid adding of outer carbon source, effectively reduce the working cost of Sewage Plant.
Accompanying drawing explanation
Fig. 1 is that Sewage treatment systems structure of the present invention and Commodity flow are to schematic diagram.
In figure, 1-settling pit; 2-biological dephosphorize denitrification pond; 3-second pond; 4-mud inorganics separator; 5-sludge carbon source pond; 6-sludge dewatering system; 7-water inlet pipe; 8-settling pit rising pipe; 9-mixed solution delivery pipe; 10-rising pipe; 11-mud return line; 12-excess sludge discharge pipe; 13-underflow mud discharging pipe; 14-overflow sludge delivery pipe; 15-sludge carbon source return line; 16-aerating system.
Embodiment
Below in conjunction with specific embodiment, the present invention is described in further detail.
one, a kind of reinforced phosphor-removing denitrifying sewage water treatment method based on sludge carbon source recycle, operate according to the following steps:
1) after sewage being carried out the separation of sand water, the sewage separated is imported biological dephosphorize denitrification pond, make it to run to realize denitrogenation, dephosphorization and organic removal according to the mode of anaerobic-anoxic-oxic, the oxygen needed for the nutrition in microbial decomposition sewage is provided by biological dephosphorize denitrification pond aerating system; The sewage completing biological dephosphorize denitrification is completed mud-water separation by precipitation, the water purification after process is discharged; The front end that the mud a precipitated part is back to biological dephosphorize denitrification pond is formed returned sluge, and another part is then as excess sludge;
2) inert inorganic matter in the excess sludge described in step 1) is separated, and then form the lower underflow mud of organic content and the higher overflow sludge of organic content; After underflow mud carries out processed, outward transport after making its water ratio that dewaters be less than 80%;
3) by step 2) described in overflow sludge make organic matter wherein be the easy degraded carbon source of solubilised state from solid-state difficult degradation organic matter transformation by enhanced hydrolysis acidification technique, and promote the conversion of voltaile fatty acid, and then form carbon source phegma; This carbon source phegma is back to the front end in biological dephosphorize denitrification pond; Realize the recycle of sludge carbon source.
Enhanced hydrolysis acidification technique described in step 3) is the improvement carried out on the basis of traditional anaerobic sludge digestion technique acidication section.The acidication of mud refers to being collectively referred to as of hydrolysis stage in anaerobic sludge digestion and souring stage, and acidication effect can make macromole and hardly degraded organic substance chain rupture and be converted into small molecular organic acid.Microorganism main in Hydrolysis Acidification is hydrolysis bacterium and acid-producing bacteria, and above-mentioned two bacterial classifications are amphimicrobe.Utilize hydrolytic action, allow acid formers by the bacterial exopolysaccharide cement layer hydrolysis in mud, the cell walls of bacterium is opened, and macromolecular cellular material is degraded to small organic molecule matter, also the organism of large amount of complex in mud is made, be hydrolyzed into small organic molecule as comprised carbohydrate, protein, lipid etc., the final VFAs obtaining a large amount of readily biodegradables, the carbon source made it as a supplement carrys out the removal of enhanced biological nutritive substance (nitrogen, phosphorus).But Hydrolysis Acidification is very slowly, hydrolysis becomes the conditioning step of sludge disintegration.Enhanced hydrolysis acidification technique is then by artificial applying measure, and as added alkali, ultrasonic wave, machinery crack etc., and measure carrys out reinforcement sludge Hydrolysis Acidification, the cracking and impel particulate organic matter to be converted into dissolved organic matter of accelerate sludge cell.Thus realize sludge carbon source.The present invention is artificial in sludge carbon source pond 5 applies enhanced hydrolysis acidifying measure, make mud be converted into the organism (carbon source) of solubilised state efficiently, and the front end being back to biological dephosphorize denitrification pond 2 is used for supplementary carbon source, thus improves the processing efficiency of system.
As one preferred embodiment, in order to the treatment effect making aforesaid method reach good, the sludge concentration of the overflow sludge described in step 3) answers >=10000mg/L, and in mud, organic content answers >=40%; The time that this overflow sludge carries out enhanced hydrolysis acidifying is no less than one day, carries out the ORP≤50mv of the reaction environment of enhanced hydrolysis acidifying.
As one preferred embodiment, as required, using the 4-10%(mass ratio of mud precipitated described in step 1)) as excess sludge.
The present invention makes excess sludge crack in carbon source pond by measures such as enhanced hydrolysis acidifyings, and mud is solvability readily biodegradable carbon source from solid-state difficult degradation organic matter transformation; This sludge carbon source is back to biological dephosphorize denitrification pond as internal carbon source, alleviates the carbon source competition of anaerobic phosphorus release and anoxic denitrification to a certain extent, thus improves biological dephosphorize denitrification efficiency.Because excess sludge is from main flow Sewage treatment systems, is back to after excess sludge carries out carbon source in main flow Sewage treatment systems as internal carbon source not only in the effluent sludge carbon source recycle system, thus achieves the recycle of sludge carbon source.
two, based on the reinforced phosphor-removing denitrifying Sewage treatment systems of sludge carbon source recycle, as shown in Figure 1, comprise main flow Sewage treatment systems and the effluent sludge carbon source recycle system:
Described main flow Sewage treatment systems comprises settling pit 1, biological dephosphorize denitrification pond 2 and second pond 3, and described settling pit 1 is provided with water inlet pipe 7, and for being introduced by sewage, this settling pit is communicated with described biological dephosphorize denitrification pond 2 by settling pit rising pipe 8; Described biological dephosphorize denitrification pond 2 is provided with aerating system 16, and for aeration, this biological dephosphorize denitrification pond 2 is communicated with described second pond 3 by mixed solution delivery pipe 9; Described second pond 3 is provided with rising pipe 10, mud return line 11 and excess sludge discharge pipe 12 for discharging the rear water purification of process; Described mud return line 11 one end is communicated with second pond 3, and the other end is communicated with the front end in biological dephosphorize denitrification pond 2, for by activity sludge reflux; Described excess sludge discharge pipe 12 one end is communicated with second pond 3, and the other end is communicated with the effluent sludge carbon source recycle system, for mud is entered the sludge carbon source recycle system.
Wherein, the inorganic particle of more than 0.2mm is mainly removed in the effect of settling pit 1; A can be used in biological dephosphorize denitrification pond 2
2/ O biochemical reaction tank, oxidation ditch and its develop the facility that technique etc. has denitrogenation, dephosphorization and organics removal function.
When biological dephosphorize denitrification pond 2 needs outer throwing carbon source, start the effluent sludge carbon source recycle system and carry out benefit carbon.
The described effluent sludge carbon source recycle system comprises mud inorganics separator 4, sludge carbon source pond 5 and sludge dewatering system 6; Described excess sludge discharge pipe 12 is communicated with mud inorganics separator 4; Described mud inorganics separator 4 is communicated with described sludge carbon source pond 5 by overflow sludge delivery pipe 14, is communicated with described sludge dewatering system 6 by underflow mud discharging pipe 13; Sludge carbon source pond is communicated with the front end in biological dephosphorize denitrification pond 2 by sludge carbon source return line 15.
The effect of effluent sludge carbon source recycle system each several part is as follows:
Mud inorganics separator 4: be a kind of based on cyclonic separation principle, according to the equipment that mud is separated mud with density difference with the granularity difference of inorganics, inert inorganic matter material can be separated from mud, thus reach the object improving mud organic matter." a kind of being applicable to removes the separator of silt from activated sludge of sewage treatment plant " disclosed in CN102302974B can be selected as mud inorganics separator of the present invention.
Sludge carbon source pond 5: by techniques such as enhanced hydrolysis acidifyings, most of surplus mud is cracked, solid-state difficult degradation organic matter transformation is that solvability is easily degraded carbon source; Improve the biodegradability of sludge carbon source.
Sludge dewatering system 6: underflow mud enters sludge dewatering system 6 and completes dehydration, after the moisture percentage in sewage sludge after dehydration is less than 80%, can transport outward.
As one preferred embodiment, in order to regulate the sludge quantity entering the effluent sludge carbon source recycle system, described excess sludge discharge pipe 12 is provided with variable valve.
three, application example
With the settling pit water outlet of sewage work of Chongqing City for handling object, its influent quality is COD=64 ~ 203mg/L, BOD=24 ~ 100mg/L, SS=52 ~ 508mg/L, TP=2.12 ~ 10.8mg/L, TN=30 ~ 73mg/L, NH
3-N=12 ~ 38mg/L.Biological dephosphorize denitrification pond effective volume 1m
3, wherein anaerobic zone 0.1m
3, oxygen-starved area 0.2m
3, aerobic zone 0.7m
3, mud decrement pond effective volume is 0.25m
3, day output 1.5m
3.
Operating parameter: sludge age (SRT) 20 days, MLSS4000mg/L, return sludge ratio 100%, 2 days sludge carbon source pond residence time, sludge carbon source pond ORP≤50mv, the sludge concentration >=10000mg/L in sludge carbon source pond.
Result: water outlet COD≤30mg/L, TN≤13mg/L, NH
3-N≤4mg/L, TP≤0.5mg/L, average removal rate is respectively 90%, 74%, 86.7%, 90%, and effluent quality meets " urban wastewater treatment firm pollutant emission standard " (GB18918-2002) one-level A standard.Wherein, sludge carbon source rate and contribution rate are respectively 40% and 35%.
In formula: SCOD
efor the resolvable chemical oxygen demand (mg/L) after carbon source, SCOD
0for resolvable chemical oxygen demand before treatment (mg/L), TCOD
efor the total chemical oxygen demand (COD) (mg/L) after carbon source, TCOD
0for total chemical oxygen demand (COD) (mg/L) before treatment.
In formula: SCOD
efor the resolvable chemical oxygen demand (mg/L) after carbon source, CODi is the chemical oxygen demand (COD) (mg/L) of water inlet, Vs and Vi is respectively volume and the water inlet volume of sludge carbon source.
The above embodiment of the present invention is only for example of the present invention is described, and is not the restriction to embodiments of the present invention.For those of ordinary skill in the field, other multi-form change and variations can also be made on the basis of the above description.Here cannot give exhaustive to all embodiments.Every belong to technical scheme of the present invention the apparent change of amplifying out or variation be still in the row of protection scope of the present invention.
Claims (6)
1., based on a reinforced phosphor-removing denitrifying sewage water treatment method for sludge carbon source recycle, it is characterized in that, comprise the following steps:
1) after sewage being carried out the separation of sand water, the sewage separated is imported biological dephosphorize denitrification pond, make it to run to realize denitrogenation, dephosphorization and organic removal according to the mode of anaerobic-anoxic-oxic, the oxygen needed for the nutrition in microbial decomposition sewage is provided by biological dephosphorize denitrification pond aerating system; The sewage completing biological dephosphorize denitrification is completed mud-water separation by precipitation, the water purification after process is discharged; The front end that the mud a precipitated part is back to biological dephosphorize denitrification pond is formed returned sluge, and another part is then as excess sludge;
2) inert inorganic matter in the excess sludge described in step 1) is separated, and then form the lower underflow mud of organic content and the higher overflow sludge of organic content; After underflow mud carries out processed, outward transport after making its water ratio that dewaters be less than 80%;
3) by step 2) described in overflow sludge make organic matter wherein be the easy degraded carbon source of solubilised state from solid-state difficult degradation organic matter transformation by enhanced hydrolysis acidification technique, and promote the conversion of voltaile fatty acid, and then form carbon source phegma; This carbon source phegma is back to the front end in biological dephosphorize denitrification pond; Realize the recycle of sludge carbon source.
2. the reinforced phosphor-removing denitrifying sewage water treatment method based on sludge carbon source recycle according to claim 1, is characterized in that, the sludge concentration >=10000mg/L of the overflow sludge described in step 3), organic content >=40% in mud; The time that this overflow sludge carries out enhanced hydrolysis acidifying is no less than one day, carries out the ORP≤50mv of the reaction environment of enhanced hydrolysis acidifying.
3. the reinforced phosphor-removing denitrifying sewage water treatment method based on sludge carbon source recycle according to claim 1, is characterized in that, the massfraction that the excess sludge described in step 1) accounts for the mud precipitated is 4-10%.
4. based on the reinforced phosphor-removing denitrifying Sewage treatment systems of sludge carbon source recycle, it is characterized in that, comprise main flow Sewage treatment systems and the effluent sludge carbon source recycle system;
Described main flow Sewage treatment systems comprises settling pit (1), biological dephosphorize denitrification pond (2) and second pond (3), described settling pit (1) is provided with water inlet pipe (7), for being introduced by sewage, this settling pit is communicated with described biological dephosphorize denitrification pond (2) by settling pit rising pipe (8); Described biological dephosphorize denitrification pond (2) is provided with aerating system (16), and for aeration, this biological dephosphorize denitrification pond (2) is communicated with described second pond (3) by mixed solution delivery pipe (9); Described second pond (3) is provided with rising pipe (10), mud return line (11) and excess sludge discharge pipe (12) for discharging the rear water purification of process; Described mud return line (11) one end is communicated with second pond (3), and the other end is communicated with the front end of biological dephosphorize denitrification pond (2), for by activity sludge reflux; Described excess sludge discharge pipe (12) one end is communicated with second pond (3), and the other end is communicated with the effluent sludge carbon source recycle system, for mud is entered the sludge carbon source recycle system;
The described effluent sludge carbon source recycle system comprises mud inorganics separator (4), sludge carbon source pond (5) and sludge dewatering system (6); Described excess sludge discharge pipe (12) is communicated with mud inorganics separator (4); Described mud inorganics separator (4) is communicated with described sludge carbon source pond (5) by overflow sludge delivery pipe (14), is communicated with described sludge dewatering system (6) by underflow mud discharging pipe (13); Sludge carbon source pond is communicated with the front end of biological dephosphorize denitrification pond (2) by sludge carbon source return line (15).
5. the reinforced phosphor-removing denitrifying Sewage treatment systems based on sludge carbon source recycle according to claim 4, is characterized in that, described biological dephosphorize denitrification pond (2) is A
2/ O biochemical reaction tank or oxidation ditch.
6. the reinforced phosphor-removing denitrifying Sewage treatment systems based on sludge carbon source recycle according to claim 4, it is characterized in that, described excess sludge discharge pipe (12) is provided with variable valve, for regulating the sludge quantity entering the effluent sludge carbon source recycle system.
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| CN106976965A (en) * | 2017-05-23 | 2017-07-25 | 上海华畅环保设备发展有限公司 | It is a kind of to include the oxidation ditch sewage treatment and device of the broken scattered processing of eddy flow |
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| CN109205937A (en) * | 2018-09-29 | 2019-01-15 | 山东天水务工程有限公司 | Biochemical sludge zero-emission sewage treatment process |
| CN111792759A (en) * | 2020-07-30 | 2020-10-20 | 中冶华天工程技术有限公司 | Sewage sludge conditioning process and system based on carbon source recycling |
| CN113636641A (en) * | 2021-08-27 | 2021-11-12 | 南开大学深圳研究院 | Carbon dioxide emission reduction sewage treatment method for converting high carbon source into activated sludge and biomass coupled carbon sequestration to prepare soil conditioner |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105366811A (en) * | 2015-12-09 | 2016-03-02 | 浦华环保股份有限公司 | Sewage treatment plant sludge treatment system, and treatment method thereof |
| CN106186574A (en) * | 2016-08-31 | 2016-12-07 | 柳州市润广科技有限公司 | A kind of processing method of industrial wastewater |
| CN106976965A (en) * | 2017-05-23 | 2017-07-25 | 上海华畅环保设备发展有限公司 | It is a kind of to include the oxidation ditch sewage treatment and device of the broken scattered processing of eddy flow |
| CN107265635A (en) * | 2017-06-16 | 2017-10-20 | 扬州大学 | The cyclic activated sludge process of mud decrement in situ |
| CN109205937A (en) * | 2018-09-29 | 2019-01-15 | 山东天水务工程有限公司 | Biochemical sludge zero-emission sewage treatment process |
| CN111792759A (en) * | 2020-07-30 | 2020-10-20 | 中冶华天工程技术有限公司 | Sewage sludge conditioning process and system based on carbon source recycling |
| CN114426373A (en) * | 2020-10-10 | 2022-05-03 | 中国石油化工股份有限公司 | Method and device for improving nitrogen and phosphorus removal effect of AO system |
| CN114426373B (en) * | 2020-10-10 | 2023-01-20 | 中国石油化工股份有限公司 | Method and device for improving nitrogen and phosphorus removal effect of AO system |
| CN113636641A (en) * | 2021-08-27 | 2021-11-12 | 南开大学深圳研究院 | Carbon dioxide emission reduction sewage treatment method for converting high carbon source into activated sludge and biomass coupled carbon sequestration to prepare soil conditioner |
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