CN102659259A - Acid-cleaning wastewater treatment method for correcting and regulating pH value - Google Patents
Acid-cleaning wastewater treatment method for correcting and regulating pH value Download PDFInfo
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- CN102659259A CN102659259A CN2012101089418A CN201210108941A CN102659259A CN 102659259 A CN102659259 A CN 102659259A CN 2012101089418 A CN2012101089418 A CN 2012101089418A CN 201210108941 A CN201210108941 A CN 201210108941A CN 102659259 A CN102659259 A CN 102659259A
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Abstract
The invention, relating to the technical field of environmental protection, discloses an acid-cleaning wastewater treatment method for correcting and regulating a pH value, comprising the following steps: successively sending acid-cleaning wastewater in a first-order reaction tank, a second-order reaction tank, a process tank, an inclined plate sedimentation tank, and an intermediate tank, and filtering through a walnut shell filter to complete the wastewater treatment. The method is characterized in that the first-order reaction tank and the second-order reaction tank are both provided with lime automatic feeding units, the lime automatic feeding unit comprises a pH detector, a 4-20 mA analog input execution mechanism, electric V-type regulating ball valves with the caliber of 50 mm, and a controller, the controller is connected with the pH detector and the execution mechanism, the execution mechanism controls the electric V-type regulating ball valves; the two electric V-type regulating ball valves controls the opening degrees according to the design requirements; and in the above control operation, manual detection of the pH correction is added to the controller. The method solves the problems of unstable effects of acid-cleaning wastewater treatment, uncontrollable addition dosage, high processing cost and the like in the prior art, and is mainly suitable for the wastewater treatment in production lines of plated and coated steel plates.
Description
(1) technical field: the present invention relates to the environmental technology field on the coating steel plate production line, especially a kind of pickling waste waters treatment process of revising the adjustment pH value.
(2) technical background: in the production line of coating steel plate, need handle pickling waste waters at last, recycle then.Acid-base neutralisation is an important ring during pickling waste waters is handled, and the pH value of continous-stable is one of key factor that influences water treatment effect.The treatment scheme of existing acid waste water is: the rinsing acid waste water (major ingredient is a hydrochloric acid) by zinc-plated pickling line discharging is sent into the first order reaction pond respectively successively.The pH value of waste water between 2-3, need get into secondary neutralization reaction pond usually again about the first order reaction pond carries out just being transferred to 7.In secondary neutralization reaction pond again accurate adjustment to the optimum handling effect section of 8-9.PH value drops into Poly aluminum Chloride (PAC) and SEPIGEL 305 at the waste water of 8-9 in process pool (coagulation+help and coagulate), in inclined-plate clarifying basin, reach the precipitate and separate effect of waste water.Supernatant changes intermediate pool in inclined-plate clarifying basin, filters through walnut shell filter and gets into reuse pool, and the water in the reuse pool just can utilize or efflux again.
In the existing wastewater treatment process, the I and II reaction tank is carrying out there is the bigger problem of fluctuation when pH value is regulated, and major cause is that to add valve be switching value input electrically operated valve to existing lime; Can only when the upper and lower limit of pH value fluctuation, carry out complete shut-down and standard-sized sheet action; Make the waste water pH value that gets in the coagulation basin extremely unstable, be dark width of cloth sawtooth waveform, PH detects meter probe work under bad environment on the other hand; After use is long-time; Usually deviation can occur, the pH value that records is inaccurate, and design pickling waste waters processing optimum handling pH value is between the 8-9.Because Equipment Inspection and the precision that feeds intake are restricted, through in the two-stage and after the waste water pH value often between 7-13, fluctuate.Not only influence the pH value of discharge water; Treatment effect is also unstable; Adding dose and also can't accurately regulating of Poly aluminum Chloride (PAC) and SEPIGEL 305 is to guarantee treatment effect, and way is to add the volume pump ratio to Poly aluminum Chloride (PAC) and SEPIGEL 305 to be adjusted into 100% usually; Thereby cause the waste that adds drug material, the processing cost of waste water is increased.
The (3) summary of the invention: the object of the invention to solve exactly existing pickling waste waters handle in pH value control not accurate, fluctuation is big, treatment effect is extremely unstable; It is uncontrollable to add dose; Consumption is big, and the problem that processing cost is high provides a kind of pickling waste waters treatment process of revising the adjustment pH value.
Concrete scheme of the present invention is: improve to existing pickling waste waters treatment process, concrete technical process is pickling waste waters to be sent into first order reaction pond adding lime successively carry out neutralization reaction, and the waste water pH value just is transferred to 6-7; Waste water entering second order reaction pond adding lime carries out neutralization reaction then; The accurate adjustment of waste water pH value to 8-9, is sent into waste water and is divided two sections to add Poly aluminum Chloride (PAC) respectively and carry out coagulation with SEPIGEL 305 and coagulate with helping in the process pool, last waste water successively through sloping plate deposition, press mud to transport outward; The intermediate pool transition; Walnut shell filter filters completion wastewater treatment entering reuse pool and waits to utilize, and it is characterized in that: in first order reaction pond and second order reaction pond, all be furnished with the lime automatic release device, this device includes pH value and detects meter; 4-20mA analog quantity input topworks; Bore is electric V-shaped adjusting ball valve and the unit of 50mm, and unit detects meter with pH value simultaneously and is connected the electric V-shaped adjusting ball valve of actuating mechanism controls with topworks; The electric V-shaped adjusting ball valve that wherein is installed in the first order reaction pond is controlled aperture: PH≤5 by following requirement, and aperture is 100%; PH value 5-6, aperture is 80%; PH value 6-7, aperture is 50%; PH value 7-7.5, aperture is 20%; PH value 7.5-8, aperture is 10%; PH>=8, aperture are 0; The electric V-shaped adjusting ball valve that is installed in the second order reaction pond is controlled aperture: PH≤7 by following requirement, and aperture is 100%; PH value 7-7.5, aperture is 60%; PH value 7.5-8, aperture is 40%; PH value 8-8.5, aperture is 25%; PH value 8.5-9, aperture is 10%; PH >=9, aperture are 0; And in above-mentioned red-tape operati; Unit is added manual detection pH value modified value; The pH value that promptly uses the PH test paper that the waste water detection in the reaction tank is obtained through manual work detects the detected value of counting with PH and compares, and both differences are put into unit correction.
The present invention has following characteristics:
1. through the PH debugging functions, guaranteed waste water soda acid verity in the control process, guaranteed to regulate the safety of potential of hydrogen, for follow-up coagulation and help the effect of coagulating reaction to lay a good foundation;
2. the present invention adds valve and the closed-loop control that is changed into aperture multilevel simulation amount and waste water pH value by switch change with liming, makes the waste water pH value that gets in the coagulation basin narrow down to the fluctuation between 8-9 by fluctuation between the original 6-12, has improved the stability of system;
3. reduced the consumption of waste water conditioner Poly aluminum Chloride (PAC) and SEPIGEL 305.Because system process is stable, also can realize stable control aspect adding at medicament.In the prior art, the Poly aluminum Chloride (PAC) average quantity used in unit volume blasted is 0.4 kilogram of/ton waste water on the production line, and the SEPIGEL 305 average quantity used in unit volume blasted is 0.06 kilogram of/ton waste water.Embodiment of the present invention post polymerization aluminum chloride average quantity used in unit volume blasted is 0.18 kilogram of/ton waste water; The SEPIGEL 305 average quantity used in unit volume blasted is 0.04 kilogram of/ton waste water. handled 4000 tons of waste water by every month, can practice thrift in year and consume 117324 yuan.
The (4) description of drawings:
Fig. 1 is a process flow sheet of the present invention.
The (5) embodiment:
Referring to Fig. 1, the concrete technical process of pickling waste waters treatment process of the present invention is pickling waste waters to be sent into first order reaction pond adding lime successively carry out neutralization reaction, and the waste water pH value just is transferred to 6-7; Waste water entering second order reaction pond adding lime carries out neutralization reaction then; The accurate adjustment of waste water pH value to 8-9, is sent into waste water and is divided two sections to add Poly aluminum Chloride (PAC) respectively and carry out coagulation with SEPIGEL 305 and coagulate with helping in the process pool, last waste water successively through sloping plate deposition, press mud to transport outward; The intermediate pool transition; Walnut shell filter filters completion wastewater treatment entering reuse pool and waits to utilize, and particularly: in first order reaction pond and second order reaction pond, all be furnished with the lime automatic release device, this device includes pH value and detects meter; 4-20mA analog quantity input topworks; Bore is electric V-shaped adjusting ball valve and the unit of 50mm, and unit detects meter with pH value simultaneously and is connected the electric V-shaped adjusting ball valve of actuating mechanism controls with topworks; The electric V-shaped adjusting ball valve that wherein is installed in the first order reaction pond is controlled aperture: PH≤5 by following requirement, and aperture is 100%; PH value 5-6, aperture is 80%; PH value 6-7, aperture is 50%; PH value 7-7.5, aperture is 20%; PH value 7.5-8, aperture is 10%; PH>=8, aperture are 0; The electric V-shaped adjusting ball valve that is installed in the second order reaction pond is controlled aperture: PH≤7 by following requirement, and aperture is 100%; PH value 7-7.5, aperture is 60%; PH value 7.5-8, aperture is 40%; PH value 8-8.5, aperture is 25%; PH value 8.5-9, aperture is 10%; PH >=9, aperture are 0; And in above-mentioned red-tape operati; Unit is added manual detection pH value modified value; The pH value that promptly uses the PH test paper that the waste water detection in the reaction tank is obtained through manual work detects the detected value of counting with PH and compares, and both differences are put into unit correction.
Claims (1)
1. a pickling waste waters treatment process of revising the adjustment pH value is pickling waste waters to be sent into first order reaction pond adding lime successively carry out neutralization reaction, and the waste water pH value just is transferred to 6-7; Waste water entering second order reaction pond adding lime carries out neutralization reaction then; The accurate adjustment of waste water pH value to 8-9, is sent into waste water and is divided two sections to add Poly aluminum Chloride (PAC) respectively and carry out coagulation with SEPIGEL 305 and coagulate with helping in the process pool, last waste water successively through sloping plate deposition, press mud to transport outward; The intermediate pool transition; Walnut shell filter filters completion wastewater treatment entering reuse pool and waits to utilize, and it is characterized in that: in first order reaction pond and second order reaction pond, all be furnished with the lime automatic release device, this device includes pH value and detects meter; 4-20mA analog quantity input topworks, bore is electric V-shaped adjusting ball valve and the unit of 50mm; Unit detects meter with pH value simultaneously and is connected the electric V-shaped adjusting ball valve of actuating mechanism controls with topworks; The electric V-shaped adjusting ball valve that wherein is installed in the first order reaction pond is controlled aperture: PH≤5 by following requirement, and aperture is 100%; PH value 5-6, aperture is 80%; PH value 6-7, aperture is 50%; PH value 7-7.5, aperture is 20%; PH value 7.5-8, aperture is 10%; PH>=8, aperture are 0; The electric V-shaped adjusting ball valve that is installed in the second order reaction pond is controlled aperture: PH≤7 by following requirement, and aperture is 100%; PH value 7-7.5, aperture is 60%; PH value 7.5-8, aperture is 40%; PH value 8-8.5, aperture is 25%; PH value 8.5-9, aperture is 10%; PH>=9, aperture are 0; And in above-mentioned red-tape operati; Unit is added manual detection pH value modified value; The pH value that promptly uses the PH test paper that the waste water detection in the reaction tank is obtained through manual work detects the detected value of counting with PH and compares, and both differences are put into unit correction.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103058418A (en) * | 2013-01-18 | 2013-04-24 | 北京市环境保护科学研究院 | Pretreatment device and method for biochemically treating acrylic waste water |
| CN103268127A (en) * | 2013-05-27 | 2013-08-28 | 天津市环境保护科学研究院 | Single-factor lime automatic dosing control device and method for pickling wastewater in iron and steel industry |
| CN103663784A (en) * | 2013-12-04 | 2014-03-26 | 天能电池(芜湖)有限公司 | Treatment and recovery system for battery lead-acid waste water |
| CN104787926A (en) * | 2015-03-30 | 2015-07-22 | 沈阳飞机工业（集团）有限公司 | Sewage treatment system and sewage treatment method |
| CN107381764A (en) * | 2017-08-31 | 2017-11-24 | 河南幔利橡树自动化科技技术有限公司 | A kind of PH automatons |
| CN107585908A (en) * | 2017-09-28 | 2018-01-16 | 陕西富兴环保科技有限公司 | Automatic business processing control system for titanium processing pickling sewage |
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| CN102295354A (en) * | 2010-06-25 | 2011-12-28 | 宝山钢铁股份有限公司 | Dosing control method of phosphate in middle-low pressure boiler |
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- 2012-04-16 CN CN2012101089418A patent/CN102659259A/en active Pending
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| CN102295354A (en) * | 2010-06-25 | 2011-12-28 | 宝山钢铁股份有限公司 | Dosing control method of phosphate in middle-low pressure boiler |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103058418A (en) * | 2013-01-18 | 2013-04-24 | 北京市环境保护科学研究院 | Pretreatment device and method for biochemically treating acrylic waste water |
| CN103268127A (en) * | 2013-05-27 | 2013-08-28 | 天津市环境保护科学研究院 | Single-factor lime automatic dosing control device and method for pickling wastewater in iron and steel industry |
| CN103663784A (en) * | 2013-12-04 | 2014-03-26 | 天能电池(芜湖)有限公司 | Treatment and recovery system for battery lead-acid waste water |
| CN104787926A (en) * | 2015-03-30 | 2015-07-22 | 沈阳飞机工业（集团）有限公司 | Sewage treatment system and sewage treatment method |
| CN104787926B (en) * | 2015-03-30 | 2017-02-08 | 盛大环境工程有限公司 | Sewage treatment system and sewage treatment method |
| CN107381764A (en) * | 2017-08-31 | 2017-11-24 | 河南幔利橡树自动化科技技术有限公司 | A kind of PH automatons |
| CN107585908A (en) * | 2017-09-28 | 2018-01-16 | 陕西富兴环保科技有限公司 | Automatic business processing control system for titanium processing pickling sewage |
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Application publication date: 20120912 |