CN102260008A - Treatment method and treatment system for cold-rolling oily wastewater - Google Patents
Treatment method and treatment system for cold-rolling oily wastewater Download PDFInfo
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- CN102260008A CN102260008A CN 201010187458 CN201010187458A CN102260008A CN 102260008 A CN102260008 A CN 102260008A CN 201010187458 CN201010187458 CN 201010187458 CN 201010187458 A CN201010187458 A CN 201010187458A CN 102260008 A CN102260008 A CN 102260008A
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Abstract
The invention discloses a treatment method and a treatment system for cold-rolling oily wastewater. The treatment method comprises the following steps: (1) firstly, successively carrying out biological treatment and flocculent settling on the cold-rolling oily wastewater, and then introducing into a storage tank; (2) transferring the wastewater in the storage tank to an ultrafiltration device for filtration; (3) introducing filtrate obtained after treatment by the ultrafiltration device into an alkalinity adjusting tank to adjust the pH value of the effluent to 6-8, and then introducing into a first intermediate water tank; (4) conveying the water in the first intermediate water tank into an electric absorption device for treatment, and after treatment, introducing into a second intermediate water tank; (5) after treating the water in the second intermediate water tank with a filter, introducing into a third intermediate water tank; and (6) conveying the water in the third intermediate water tank into a reverse osmosis treatment device for treatment and then conveying the effluent to a pure water tank. Through the treatment method and treatment system disclosed by the invention, the water quality can reach the requirements of cold-rolling production water, the recycling rate of the wastewater is high and a lot of water resources are saved.
Description
Technical field
The present invention relates to field of waste water treatment, particularly a kind of cold rolling oily wastewater treatment method and system thereof.
Background technology
Smelter produces a large amount of oily(waste)waters at rolling process, and roughly there are following three parts in its source:
The one, in order to eliminate the thermal distortion of cold rolling generation, need to adopt emulsion to cool off and lubricate, therefrom the cold-rolling emulsion waste water of Chan Shenging in the belt steel rolling process.The emulsion that is adopted mainly is made up of 2～10% the mineral oil or the emulsifying agent and the water of vegetables oil, anionic or non-ionic type.
The 2nd, the cooling zone steel all will be used alkaline degreasing solution before open coil annealing, produces a large amount of alkaline oily(waste)waters.Used basic solution main component is a sodium hydroxide, tensio-active agent etc.
The 3rd, the mechanical oils of in rolling equipment, leaking out during the various device fault.
Above-mentioned three parts are the chief component of cold rolling oily(waste)water.General oily wastewater treatment method such as air supporting method, absorption method, biological process, chemical methods etc. all are difficult to obtain the ideal treatment effect.Chinese patent CN1736906A discloses a kind of method and system thereof of cold rolling emulsion wastewater treatment, it adopts physical sepn, biological treatment to add the mode of chemical precipitation, remove each pollutant, discharge after reaching environmental requirement, its effluent index is oleaginousness≤10mg/l, ss suspended solid≤30mg/l, COD≤100mg/l, do not carry out advanced treatment, water outlet can't be as cold rolling water of productive use reuse, can only discharge or do stock yard dust suppression water etc. and require undemanding water of productive use to use.The phenomenon that repeat usage is low, water resource waste is serious of present cold rolling industry ubiquity water.
Summary of the invention
For addressing the above problem, the invention provides a kind of cold rolling oily wastewater treatment method and system thereof, after being handled, cold rolling oily(waste)water can reach cold rolling water of productive use requirement.
For achieving the above object, cold rolling oily wastewater treatment method of the present invention may further comprise the steps:
Step 1, cold rolling oily(waste)water earlier through biological treatment, again pass through flocculation sediment after, enter storage tanks;
Step 4, the water in above-mentioned first intermediate water tank sent into send into second intermediate water tank after the electro-adsorption device is handled;
Step 6, the water in described the 3rd intermediate water tank is sent into the reverse-osmosis treated device handle, then the pure water case is sent in the water outlet of described reverse-osmosis treated device.
Preferably, the dense water with the discharging of the device of reverse-osmosis treated described in the step 6 is sent to described first intermediate water tank.
Cold rolling oily(waste)water control indexes in the described step 1 behind the flocculation sediment is at COD＜200mg/l, specific conductivity＜4500us/cm, oleaginousness＜10mg/l.
Cold rolling oil-contained waste water treatment system of the present invention comprises the bin, ultra-filtration equipment, basicity adjustment groove, first intermediate water tank, electro-adsorption device, second intermediate water tank, strainer, the 3rd intermediate water tank and the reverse-osmosis treated device that connect successively.
Preferably, described reverse-osmosis treated device comprises water outlet port and dense water end (W.E.) mouth, and described dense water end (W.E.) mouth is connected with described first intermediate water tank.
Described electro-adsorption device comprises two or three placed in-line electro-adsorption modules.
Described electro-adsorption device is two, and two described electro-adsorption devices are used alternatingly.
Described strainer is a more medium filter.
Before the described reverse-osmosis treated device security personnel's strainer is installed.
Described reverse-osmosis treated device is two, and two described reverse-osmosis treated device series connection are used.
Cold rolling oily wastewater treatment method of the present invention and system thereof, the cold rolling oily(waste)water after the processing can reach PH6-9, specific conductivity＜10us/cm, muriate＜1.0mg/l, producing water ratio＞75% satisfies cold rolling water of productive use needs.
By cold rolling oily wastewater treatment method of the present invention and system thereof, handle the emission standard that back water quality is better than water greatly, reduced pollution to external world, and water quality can reach the requirement of cold rolling water of productive use, the repeating utilization factor height can be saved great lot of water resources.
Description of drawings
Fig. 1 is a cold rolling oily(waste)water Processing Equipment schema of the present invention.
Embodiment
Fig. 1 is a cold rolling oily(waste)water Processing Equipment schema of the present invention.As shown in the figure,
Cold rolling oil-contained waste water treatment system of the present invention comprises the bin 1, ultra-filtration equipment 2, basicity adjustment groove 3, first intermediate water tank 4, electro-adsorption device 5, second intermediate water tank 6, strainer 7, the 3rd intermediate water tank 8 and the reverse-osmosis treated device 9 that connect successively.
Described reverse-osmosis treated device 9 comprises water side and dense water end (W.E.), and described dense water end (W.E.) is connected with described first intermediate water tank 4.Described water side is connected with pure water case 10.The water outlet of described reverse-osmosis treated device 9 can be stored in and be used in the pure water case 10 producing, and the dense water of described reverse-osmosis treated device 9 dischargings can be sent to described first intermediate water tank 4 and handle.
Cold rolling oily wastewater treatment method of the present invention may further comprise the steps:
Step 1, cold rolling oily(waste)water earlier through biological treatment, again pass through flocculation sediment after, enter storage tanks 1.
The above contact oxidation method of two-stage is adopted in wherein said biological treatment.Biological contact oxidation process is a kind of bio membrane process between activated sludge process and biological filter, be characterized in the pond, being provided with filler, aeration carries out oxygenation to sewage at the bottom of the pond, and make body interior sewage in pond be in flow state, to guarantee that sewage fully contacts with filler in the sewage, avoids existing in the biological contact oxidation pond sewage to contact the defective of inequality with filler.
I and II contact-oxidation pool aeration intensity 10～25m
3/ m
2H, 2～5 hours one-level contact-oxidation pool residence time, 4～8 hours two-stage biological contact oxidation pond residence time, PH is controlled at 6-9, and temperature is controlled at the 25-45 degree.
The flocculation agent of described flocculation sediment adopts polyacrylamide, and the flocculation agent configuration concentration is 1 ‰～1.5 ‰, and dosage is every liter of waste water 1.2～1.5ml, and settling tank can adopt inclined-plate clarifying basin, rectangular sedimentation tank, vertical sedimentation basin.
Cold rolling oily(waste)water behind the described flocculation sediment is controlled at COD＜200mg/l, specific conductivity＜4500us/cm, oleaginousness＜10mg/l.
COD is meant chemical oxygen demand (COD), is under certain conditions, when adopting certain strong oxidizer to handle water sample, and the oxidant content that is consumed.
The ultra-filtration membrane of described ultra-filtration equipment can adopt external placed type ultra-filtration membrane or built-in board-like ceramic membrane, and the ultra-filtration membrane aperture is 4～10nm.Effluent index reaches: COD＜180mg/l, specific conductivity＜4500us/cm, oleaginousness＜10mg/l.
Described mineral acid can be sulfuric acid, nitric acid, hydrochloric acid.Reach through the adjusted cold rolling wastewater of basicity: the pH value is 6～8, specific conductivity＜4500us/cm.
Step 4, the water in above-mentioned first intermediate water tank 4 sent into send into second intermediate water tank 6 after electro-adsorption device 6 is handled.
The core of electro-adsorption device 6 is electro-adsorption modules, and described electro-adsorption device 6 comprises two or three placed in-line electro-adsorption modules, forms secondary or three grades of electro-adsorption modules.Preferably, described electro-adsorption device 6 is two, described two electro-adsorption device 6 parallel connections, and alternate run during production so that one of them is cleaned, reaches the quantity-produced purpose.
6 cycles of operation of electro-adsorption device are divided into: pre-treatment, work, cleaning three phases.At pretreatment stage, flow set is 70～100% of a working flow, and bin 1 is returned in water outlet, and carrying out the pretreated time is 5～20 minutes.Press 100% flow work at working stage.The wash phase of described electro-adsorption device 6 adopts 2 to 3 grades of back flush, finishes behind 4000-5000us/cm until the flushing electrical conductivity of water.
As follows through effluent index after the two-stage electro-adsorption resume module: COD20～60mg/l, specific conductivity 400～700us/cm, chlorion 100～361mg/l.
Effluent index is as follows after three grades of electro-adsorption resume module: COD20～50mg/l, and specific conductivity 300～500us/cm, chlorion 40～60mg/l,
Described strainer 7 adopts more medium filter to carry out filtration treatment.The filtration medium of described more medium filter is selected from filtration medium and is selected from quartz sand, hard coal, anthracite, the natural manganese sand two or more.Quartz sand (or natural manganese sand) is (2～4) with the volume ratio of hard coal (anthracite): (1～3), strainer 7 also can adopt the single-activity carbon filter in addition.
Step 6, the water in described the 3rd intermediate water tank 8 is sent into reverse-osmosis treated device 9 handle, then water outlet is sent into pure water case 10.
Water in the pure water case 10 can be used as water of productive use.
Before the described reverse-osmosis treated device 9 security personnel's strainer can be installed, its aperture is 5～10um, to reduce the probability that reverse osmosis membrane damages because of unforeseen circumstances.Preferably two in described reverse-osmosis treated device 9, two described reverse-osmosis treated device 9 series connection are used.Described reverse osmosis membrane is the aromatic polyamide composite membrane, as: Hydranautics ESPA2-40401 type reverse osmosis membrane.
Reverse osmosis is a kind of reverse locomotory movement, is a kind of under pressure-driven, the separation method that solute in the solution and solvent is separated by the selection crown_interception of permeable membrane.In the treating processes, with reverse osmosis technology with Impurity removals such as the mineral ion in the water, bacterium, organism, to obtain high-quality water.Described reverse-osmosis treated device 9 also comprises the dense water of discharging except water outlet, be the dense environmental pollution by water that prevents to discharge after reverse-osmosis treated device 9 is handled, and waste water.Therefore, the dense water of described discharging after reverse-osmosis treated device 9 is handled can be sent to described first intermediate water tank 4.Can handle this dense water, this mode can improve the producing water ratio of whole technology again.
Carry out can also using Scale inhibitors before the reverse-osmosis treated, using the effect of Scale inhibitors is further to avoid reverse osmosis membrane generation scale formation, increases the service life.
Water after the reverse osmosis membrane processing device is handled can reach following index: COD＜15mg/l, PH6-9, muriate＜1.0mg/l, specific conductivity＜10us/cm.
Below be two preferred embodiments of cold rolling oily wastewater treatment method of the present invention
Embodiment 1:
Cold rolling oily(waste)water deep treatment method as shown in Figure 1, may further comprise the steps:
Step 1, cold rolling oily(waste)water earlier through biological treatment, again pass through flocculation sediment after, enter storage tanks 1.The water inlet index is as follows:
Step 4, the water in above-mentioned first intermediate water tank 4 sent into send into second intermediate water tank 6 after electro-adsorption device 6 is handled.The electro-adsorption device is that Aisite Purifying Apparatus Co., Ltd., Changzhou produces, and the electro-adsorption device adopts secondary electro-adsorption module, and each index of water outlet is as follows after electro-adsorption is handled:
Step 6, the water in described the 3rd intermediate water tank 8 is sent into reverse-osmosis treated device 9 handle, and pure water case 10 is sent in water outlet.Reverse-osmosis treated device 9 adopts two steps ro to handle, i.e. two reverse-osmosis treated device series connection.The reverse osmosis membrane of reverse-osmosis treated device adopts Hydranautics ESPA2-40401 type reverse osmosis membrane.
The system pressure 1.4Mpa of 1 grade of reverse-osmosis treated, dense water get back to first intermediate water tank 4.The every data of water outlet are as follows:
The system pressure 1.4Mpa of 2 grades of reverse-osmosis treated, dense water get back to first intermediate water tank 4.Effluent index is as follows:
This water can be used as cold rolling full factory water of productive use.Producing water ratio 77.78%
Embodiment 2:
Cold rolling oily(waste)water deep treatment method as shown in Figure 1, may further comprise the steps:
Step 1, cold rolling oily(waste)water earlier through biological treatment, again pass through flocculation sediment after, enter storage tanks 1.Water inlet index condition is as follows:
Step 4, the water in above-mentioned first intermediate water tank 4 sent into send into second intermediate water tank 6 after electro-adsorption device 6 is handled.The electro-adsorption device is that Aisite Purifying Apparatus Co., Ltd., Changzhou produces, and the electro-adsorption device adopts three grades of electro-adsorption modules, and each index of water outlet is as follows after electro-adsorption is handled:
Step 6, the water in described the 3rd intermediate water tank 8 is sent into reverse-osmosis treated device 9 handle, and pure water case 10 is sent in water outlet.Reverse-osmosis treated device 9 adopts two steps ro to handle, i.e. two reverse-osmosis treated device series connection.The reverse osmosis membrane of reverse-osmosis treated device adopts Hydranautics ESPA2-40401 type reverse osmosis membrane.Before the reverse-osmosis treated device 9 aperture being installed is security personnel's strainer of 5um, security personnel's strainer water outlet SDI=6, and wherein SDI is dirty stifled index.
The system pressure 1.3Mpa of 1 grade of reverse-osmosis treated, dense water get back to first intermediate water tank 4.The every data of water outlet are as follows:
The system pressure 1.4Mpa of 2 grades of reverse-osmosis treated, dense water get back to first intermediate water tank 4.Effluent index is as follows:
This water can be used as cold rolling full factory water of productive use.Producing water ratio 76.08%
Embodiment among the present invention only is used for that the present invention will be described, does not constitute the restriction to the claim scope, and other substituting of being equal in fact that those skilled in that art can expect are all in protection domain of the present invention.
Claims (10)
1. a cold rolling oily wastewater treatment method is characterized in that, may further comprise the steps:
Step 1, cold rolling oily(waste)water earlier through biological treatment, again pass through flocculation sediment after, enter storage tanks;
Step 2, change the waste water in the described storage tanks over to ultra-filtration equipment and carry out filtration treatment;
Step 3, the filtrate after described ultra-filtration equipment is handled enter basicity and adjust groove, and the pH value of detection filtrate, if pH value greater than 8, then adds mineral acid in described basicity is adjusted groove, after the pH value that makes described basicity adjust waste water in the groove is adjusted into 6～8, send into first intermediate water tank;
Step 4, the water in above-mentioned first intermediate water tank sent into send into second intermediate water tank after the electro-adsorption device is handled;
Step 5, with the water in described second intermediate water tank, through after the filter process, send into the 3rd intermediate water tank;
Step 6, the water in described the 3rd intermediate water tank is sent into the reverse-osmosis treated device handle, then the pure water case is sent in the water outlet of described reverse-osmosis treated device.
2. cold rolling oily wastewater treatment method as claimed in claim 1 is characterized in that, the dense water that the device of reverse-osmosis treated described in the step 6 is discharged is sent to described first intermediate water tank.
3. cold rolling oily wastewater treatment method as claimed in claim 1 or 2 is characterized in that, the cold rolling oily(waste)water control indexes in the described step 1 behind the flocculation sediment is at COD＜200mg/l, specific conductivity＜4500us/cm, oleaginousness＜10mg/l.
4. cold rolling oil-contained waste water treatment system, it is characterized in that, comprise the bin, ultra-filtration equipment, basicity adjustment groove, first intermediate water tank, electro-adsorption device, second intermediate water tank, strainer, the 3rd intermediate water tank and the reverse-osmosis treated device that connect successively.
5. cold rolling oil-contained waste water treatment system as claimed in claim 4 is characterized in that, described reverse-osmosis treated device comprises water outlet port and dense water end (W.E.) mouth, and described dense water end (W.E.) mouth is connected with described first intermediate water tank.
6. as claim 4 or 5 described cold rolling oil-contained waste water treatment systems, it is characterized in that described electro-adsorption device comprises two or three placed in-line electro-adsorption modules.
7. as claim 4 or 5 described cold rolling oil-contained waste water treatment systems, it is characterized in that described electro-adsorption device is two, two described electro-adsorption devices are used alternatingly.
8. as claim 4 or 5 described cold rolling oil-contained waste water treatment systems, it is characterized in that described strainer is a more medium filter.
9. as claim 4 or 5 described cold rolling oil-contained waste water treatment systems, it is characterized in that, before the described reverse-osmosis treated device security personnel's strainer is installed.
10. as claim 4 or 5 described cold rolling oil-contained waste water treatment systems, it is characterized in that described reverse-osmosis treated device is two, two described reverse-osmosis treated device series connection are used.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102616962A (en) * | 2012-03-30 | 2012-08-01 | 中国石油化工股份有限公司 | Deep stage treatment method for industrial wastewater |
| CN103253799A (en) * | 2012-02-17 | 2013-08-21 | 中冶赛迪工程技术股份有限公司 | Steel production wastewater reuse treatment process |
| CN103508607A (en) * | 2012-06-28 | 2014-01-15 | 中国石油化工股份有限公司 | Method for improving water production rate of advanced wastewater treatment |
| CN104341066A (en) * | 2013-08-06 | 2015-02-11 | 中国科学院过程工程研究所 | Deep-treatment and reusing system and method for industrial standard-meeting externally-discharged wastewater |
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| JP2000237793A (en) * | 1999-02-16 | 2000-09-05 | Ebara Corp | Treatment of organic waste water and device |
| CN101219836A (en) * | 2007-01-12 | 2008-07-16 | 北京世博恒业科技有限公司 | System and technique for processing oily wastewater with high saline salinity |
| CN101434447A (en) * | 2008-12-18 | 2009-05-20 | 上海宝钢工程技术有限公司 | Technological process for advanced treatment and recycle of cold rolling water |
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2010
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2000237793A (en) * | 1999-02-16 | 2000-09-05 | Ebara Corp | Treatment of organic waste water and device |
| CN101219836A (en) * | 2007-01-12 | 2008-07-16 | 北京世博恒业科技有限公司 | System and technique for processing oily wastewater with high saline salinity |
| CN101434447A (en) * | 2008-12-18 | 2009-05-20 | 上海宝钢工程技术有限公司 | Technological process for advanced treatment and recycle of cold rolling water |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103253799A (en) * | 2012-02-17 | 2013-08-21 | 中冶赛迪工程技术股份有限公司 | Steel production wastewater reuse treatment process |
| CN102616962A (en) * | 2012-03-30 | 2012-08-01 | 中国石油化工股份有限公司 | Deep stage treatment method for industrial wastewater |
| CN103508607A (en) * | 2012-06-28 | 2014-01-15 | 中国石油化工股份有限公司 | Method for improving water production rate of advanced wastewater treatment |
| CN103508607B (en) * | 2012-06-28 | 2016-03-02 | 中国石油化工股份有限公司 | Improve the method for advanced treatment of wastewater producing water ratio |
| CN104341066A (en) * | 2013-08-06 | 2015-02-11 | 中国科学院过程工程研究所 | Deep-treatment and reusing system and method for industrial standard-meeting externally-discharged wastewater |
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