CN103395933A - Processing technology for electroplating wastewater and heavy metal wastewater - Google Patents
Processing technology for electroplating wastewater and heavy metal wastewater Download PDFInfo
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- CN103395933A CN103395933A CN2013103325706A CN201310332570A CN103395933A CN 103395933 A CN103395933 A CN 103395933A CN 2013103325706 A CN2013103325706 A CN 2013103325706A CN 201310332570 A CN201310332570 A CN 201310332570A CN 103395933 A CN103395933 A CN 103395933A
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Abstract
The invention discloses a processing technology for electroplating wastewater and heavy metal wastewater. The processing technology comprises a pre-treatment process, a lime milk treatment process, a pH value adjustment process, a hydrolysis-acidification process, an aerobic treatment process, a solid-liquid separation process and a sludge treatment process successively along a treatment sequence. By adopting a series of treatment of the above pre-treatment process, the lime milk treatment process, the pH value adjustment process, the hydrolysis-acidification process, aerobic treatment process, the solid-liquid separation process and the sludge treatment process, the finally obtained processed water discharged to nature meets a standard completely; and mud in sewage can be separated out, to realize classified discharge.
Description
Technical field
The invention belongs to the environmental protection equipment technical field, relate in particular to the treatment process of a kind of electroplating wastewater and heavy metal wastewater thereby.
Background technology
Electroplating wastewater is mainly derived from electroplating industry, yet electroplate, is one of the world today's three large contaminated industries, and the high water usage amount in plating production process and the heavy metal that gives off have all greatly restricted the Sustainable development of electroplating industry to the pollution of water surrounding.The composition of this type of waste water is very complicated, and except cyanide wastewater and acidic and alkaline waste water, heavy metal wastewater thereby is the great waste water classification of electroplating industry potential hazard.And other trade effluents that contain heavy metal ion are mainly derived from smelting and the part chemical enterprise of mechanical workout, mining industry, iron and steel and non-ferrous metal, this type of waste water is substantially similar to the water quality characteristic of electroplating wastewater, generally can be divided into chromate waste water, nickel-containing waste water, cadmium wastewater, copper-containing wastewater and zinc-containing water etc.Such waste water belongs to difficult for biological degradation, and the waste water of very large toxicity is arranged again.
Above-mentioned electroplating wastewater and heavy metal wastewater thereby need pass through a series of processing for this reason, can be discharged in the Nature, otherwise directly be discharged into meeting polluted-water in the nature water body, cause water hypoxia and affect the existence of fish and other hydrocoles, suspended substance in sewage easily under anaerobic decomposes and produces foul smell simultaneously, worsens water quality.
To general employing of processing that is discharged into nature organic sewage before, to the organism in sewage, use microbial strains to degrade, but this traditional sewage treatmentmethod exist the incomplete phenomenon of processing.
Summary of the invention
Technical problem to be solved by this invention is to provide the treatment process of a kind of electroplating wastewater and heavy metal wastewater thereby, has the advantages that harmless treatment effect is good.
For solving the problems of the technologies described above, technical scheme of the present invention is: the treatment process of a kind of electroplating wastewater and heavy metal wastewater thereby, its innovative point is, along processing sequence, comprises successively pretreatment technology, milk of lime treatment process, pH value adjusting process, acidication technique, aerobic treatment process, solid-liquid separation process and sludge treatment technique.
Preferably, described pretreatment technology is mainly: at first treatment sewage is sent in equalizing tank, then utilize pump that the treatment sewage in equalizing tank is sent into to neutralization reaction in the PH adjustment tank, then sewage being sent into to redox in the redox reaction groove processes, then sewage is sent in the one air-floating apparatus and carried out the removing dross processing, it is standby that sewage after processing is sent into intermediate pool, and the scum silica frost of separating is sent in sludge thickener.
Preferably, described milk of lime treatment process is mainly: the sewage in pretreated intermediate pool is sent into to the lime reaction pond, make milk of lime, polyacrylamide and sewage reaction in the lime reaction pond, remove suspended substance and negatively charged ion in sewage.
Preferably, described pH value adjusting process is mainly: the sewage after milk of lime is processed is sent into the total adjustment tank of PH, and sulfuric acid amount and sewage in the total adjustment tank of allotment PH carry out neutralization reaction, make the pH value of sewage in the total adjustment tank of PH equal 5.
Preferably, described acidication technique is mainly: the sewage after the pH value adjusting process is sent into to the acidication treating pond, by acidication, process the macromolecular substance open loop chain rupture in sewage, be converted into small-molecule substance.
Preferably, described aerobic treatment process is mainly: the sewage after acidication technique is sent into to activated sludge tank, make active sludge in the activated sewage pond and the suspended solids in sewage and jelly be adsorbed on active sludge, and the organism in sewage and activated sludge reaction generate carbonic acid gas and water.
Preferably, described solid-liquid separation process is mainly: the sewage after aerobic treatment is sent into to biochemical sedimentation basin, precipitate and isolate clear water and mud, wherein clear water is sent in the discharging pond, and mud is sent in sludge thickener.
Preferably, described sludge treatment technique is mainly: the mud in sludge thickener is squeezed into to pressure filter and carried out press dewatering with pneumatic diaphragm pump pressurization, the mud cake that obtains after dehydration carries out drying and other treatment, and the clear liquid that the pressure filter press filtration produces enters in the discharging pond.
The invention has the advantages that: by adopting a series of processing of above-mentioned pretreatment technology, milk of lime treatment process, pH value adjusting process, acidication technique, aerobic treatment process, solid-liquid separation process and sludge treatment technique, make finally that to be discharged in the Nature treated water fully up to standard, simultaneously the mud in sewage is separated, accomplished classified emission.
Embodiment
The treatment process of electroplating wastewater of the present invention and heavy metal wastewater thereby, comprise pretreatment technology, milk of lime treatment process, pH value adjusting process, acidication technique, aerobic treatment process, solid-liquid separation process and sludge treatment technique successively along processing sequence.
Wherein pretreatment technology is mainly: at first treatment sewage is sent in equalizing tank, then utilize pump that the treatment sewage in equalizing tank is sent into to neutralization reaction in the PH adjustment tank, then sewage being sent into to redox in the redox reaction groove processes, then sewage is sent in the one air-floating apparatus and carried out the removing dross processing, it is standby that sewage after processing is sent into intermediate pool, and the scum silica frost of separating is sent in sludge thickener.
Redox process according to acid adding in the alkalescence of waste water or acid this groove that do not coexist or add alkali, to guarantee follow-up redox reaction, can thoroughly carry out.If while in waste water, mainly containing complex compound, redox reaction groove domestic demand adds oxygenant; If while in waste water, mainly containing sexavalent chrome, redox reaction groove domestic demand adds reductive agent.
The principle of one air-floating apparatus is that the form of air with micro-bubble passed in water, make micro-bubble in the particle adhesion that suspends in water, form water-gas-particle three-phase mixed system, on particle adhesion after bubble, density namely floats on the surface of the water less than water, thereby solid, liquid is separated.Simultaneously dosing coagulant, flocculation agent can further be strengthened air flotation effect in the breakdown of emulsion reactive tank, to remove grease in waste water etc., can reduce CODcr, BOD, the colourity of waste water etc. simultaneously.
Wherein the milk of lime treatment process is mainly: the sewage in pretreated intermediate pool is sent into to the lime reaction pond, make milk of lime, polyacrylamide and sewage reaction in the lime reaction pond, remove suspended substance and negatively charged ion in sewage.By above-mentioned processing, make salinity in anhydrous reduce the ，Wei Hou road and process normally to move basis is provided.Due to the reduction of salinity, reduced the impact load of sewage to facility in addition.
Wherein the pH value adjusting process is mainly: the sewage after milk of lime is processed is sent into the total adjustment tank of PH, and sulfuric acid amount and sewage in the total adjustment tank of allotment PH carry out neutralization reaction, make the pH value of sewage in the total adjustment tank of PH equal 5.By the pH value by sewage, transfer to neutrality, for follow-up biochemical microbial growth breeding provides comparatively suitable water quality environment.
Wherein acidication technique is mainly: the sewage after the pH value adjusting process is sent into to the acidication treating pond, by acidication, process the macromolecular substance open loop chain rupture in sewage, be converted into small-molecule substance.
Wherein aerobic treatment process is mainly: the sewage after acidication technique is sent into to activated sludge tank, make active sludge in the activated sewage pond and the suspended solids in sewage and jelly be adsorbed on active sludge, and the organism in sewage and activated sludge reaction generate carbonic acid gas and water.
Wherein solid-liquid separation process is mainly: the sewage after aerobic treatment is sent into to biochemical sedimentation basin, precipitate and isolate clear water and mud, wherein clear water is sent in the discharging pond, and mud is sent in sludge thickener.
Wherein sludge treatment technique is mainly: the mud in sludge thickener is squeezed into to pressure filter and carried out press dewatering with pneumatic diaphragm pump pressurization, and the mud cake that obtains after dehydration carries out drying and other treatment, and the clear liquid that the pressure filter press filtration produces enters in the discharging pond.
By adopting a series of processing of above-mentioned pretreatment technology, milk of lime treatment process, pH value adjusting process, acidication technique, aerobic treatment process, solid-liquid separation process and sludge treatment technique, make finally that to be discharged in the Nature treated water fully up to standard, simultaneously the mud in sewage is separated, accomplished classified emission.
An above embodiment to the invention has been described in detail, but described content only is the preferred embodiment of the invention, can not be considered to be used to limiting the practical range of the invention.All equalizations of doing according to the invention application range change and improve etc., within all should belonging to the patent covering scope of the invention.
Claims (8)
1. the treatment process of an electroplating wastewater and heavy metal wastewater thereby, it is characterized in that, along processing sequence, comprise successively pretreatment technology, milk of lime treatment process, pH value adjusting process, acidication technique, aerobic treatment process, solid-liquid separation process and sludge treatment technique.
2. the treatment process of a kind of electroplating wastewater as claimed in claim 1 and heavy metal wastewater thereby, it is characterized in that, described pretreatment technology is mainly: at first treatment sewage is sent in equalizing tank, then utilize pump that the treatment sewage in equalizing tank is sent into to neutralization reaction in the PH adjustment tank, then sewage being sent into to redox in the redox reaction groove processes, then sewage is sent in the one air-floating apparatus and carried out the removing dross processing, it is standby that sewage after processing is sent into intermediate pool, and the scum silica frost of separating is sent in sludge thickener.
3. the treatment process of a kind of electroplating wastewater as claimed in claim 1 and heavy metal wastewater thereby, it is characterized in that, described milk of lime treatment process is mainly: the sewage in pretreated intermediate pool is sent into to the lime reaction pond, make milk of lime, polyacrylamide and sewage reaction in the lime reaction pond, remove suspended substance and negatively charged ion in sewage.
4. the treatment process of a kind of electroplating wastewater as claimed in claim 1 and heavy metal wastewater thereby, it is characterized in that, described pH value adjusting process is mainly: the sewage after milk of lime is processed is sent into the total adjustment tank of PH, sulfuric acid amount and sewage in the total adjustment tank of allotment PH carry out neutralization reaction, make the pH value of sewage in the total adjustment tank of PH equal 5.
5. the treatment process of a kind of electroplating wastewater as claimed in claim 1 and heavy metal wastewater thereby, it is characterized in that, described acidication technique is mainly: the sewage after the pH value adjusting process is sent into to the acidication treating pond, by acidication, process the macromolecular substance open loop chain rupture in sewage, be converted into small-molecule substance.
6. the treatment process of a kind of electroplating wastewater as claimed in claim 1 and heavy metal wastewater thereby, it is characterized in that, described aerobic treatment process is mainly: the sewage after acidication technique is sent into to activated sludge tank, make active sludge in the activated sewage pond and the suspended solids in sewage and jelly be adsorbed on active sludge, and the organism in sewage and activated sludge reaction generate carbonic acid gas and water.
7. the treatment process of a kind of electroplating wastewater as claimed in claim 1 and heavy metal wastewater thereby, it is characterized in that, described solid-liquid separation process is mainly: the sewage after aerobic treatment is sent into to biochemical sedimentation basin, precipitate and isolate clear water and mud, wherein clear water is sent in the discharging pond, and mud is sent in sludge thickener.
8. the treatment process of a kind of electroplating wastewater as claimed in claim 1 and heavy metal wastewater thereby, it is characterized in that, described sludge treatment technique is mainly: the mud in sludge thickener is squeezed into to pressure filter and carried out press dewatering with pneumatic diaphragm pump pressurization, the mud cake that obtains after dehydration carries out drying and other treatment, and the clear liquid that the pressure filter press filtration produces enters in the discharging pond.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104150680A (en) * | 2014-06-19 | 2014-11-19 | 浙江海洋学院 | Treatment method and system for electroplating wastewater |
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| JPS55109490A (en) * | 1979-01-29 | 1980-08-22 | Tsukuba Daigaku | Treating method of cyan-containing waste water |
| US5647996A (en) * | 1995-06-16 | 1997-07-15 | Ormet Corporation | Groundwater total cyanide treatment method |
| CN101337747A (en) * | 2008-08-07 | 2009-01-07 | 常卫平 | Automation control electroplating waste processing process |
| CN101875520A (en) * | 2010-08-10 | 2010-11-03 | 南京师范大学 | Processing method of electroplating wastewater containing cyanogens and chrome |
| CN102775004A (en) * | 2011-10-31 | 2012-11-14 | 何学文 | Mixed electric plating wastewater treatment system and process method of mixed electric plating wastewater treatment system |
| CN202829777U (en) * | 2012-08-25 | 2013-03-27 | 东莞市优赛科创企业管理咨询有限公司 | Electroplating wastewater treatment system |
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- 2013-08-02 CN CN2013103325706A patent/CN103395933A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55109490A (en) * | 1979-01-29 | 1980-08-22 | Tsukuba Daigaku | Treating method of cyan-containing waste water |
| US5647996A (en) * | 1995-06-16 | 1997-07-15 | Ormet Corporation | Groundwater total cyanide treatment method |
| CN101337747A (en) * | 2008-08-07 | 2009-01-07 | 常卫平 | Automation control electroplating waste processing process |
| CN101875520A (en) * | 2010-08-10 | 2010-11-03 | 南京师范大学 | Processing method of electroplating wastewater containing cyanogens and chrome |
| CN102775004A (en) * | 2011-10-31 | 2012-11-14 | 何学文 | Mixed electric plating wastewater treatment system and process method of mixed electric plating wastewater treatment system |
| CN202829777U (en) * | 2012-08-25 | 2013-03-27 | 东莞市优赛科创企业管理咨询有限公司 | Electroplating wastewater treatment system |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104150680A (en) * | 2014-06-19 | 2014-11-19 | 浙江海洋学院 | Treatment method and system for electroplating wastewater |
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Application publication date: 20131120 |