CN1047155C - New technology for treating electroplating waste water with micro-organism - Google Patents
New technology for treating electroplating waste water with micro-organism Download PDFInfo
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- CN1047155C CN1047155C CN 93106616 CN93106616A CN1047155C CN 1047155 C CN1047155 C CN 1047155C CN 93106616 CN93106616 CN 93106616 CN 93106616 A CN93106616 A CN 93106616A CN 1047155 C CN1047155 C CN 1047155C
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- waste water
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- electroplating
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Abstract
The present invention relates to a new method for treating electroplating waste water by using complex bacteria such as fusobacterium nucleatum, paracoccus denitrificane, Edwardsiclla tarda, peptococcus anaerobius, etc. The present invention can effectively reduce hexavalent chrome in the electroplating waste water into trivalent chromium, and settles the hexavalent chrome out of water solution in a chromium hydroxide compound form so as to achieve the purpose of purifying water. The settled chromium can be recovered by simple chemical or physical methods. The method simultaneously discharges chromium, nickel, copper, zinc, etc. by reaching the standards, and has the advantages of good quality of treated water, no secondary pollution, strong adaptability to waste water, simple technology flow path, energy saving, good economic performance and low cost.
Description
The invention belongs to the technology of chromium-electroplating waste water being carried out microbial treatment.
Chromic some compound has carcinogenesis to the crowd.The Cr of water soluble ion state (VI) is easily by intestinal absorption, and permeate through cell membranes makes some biomolecules oxidation and combines and produce with it and causes toxication.Chromium poisoning can make nose diaphragm and tympanic member perforation, skin ulcer, and perleche causes the digestive system function disorder, diarrhoea and initiation meningitis and lung cancer.
Chromic salts is important inorganic chemistry product, it is widely used in metallurgy, chemical industry, light industry, machinery and electronics department, the water-solubility Cr (VI) that Electroplate Factory under these departments, smeltery, Alloy Plant, dye processing plant, tannery, timber mill and rubber plant produce is very big to human body and environmental risk, farm crop and HUMAN HEALTH are endangered, therefore, thorough improvement to enterprise's chrome waste water is extremely urgent, and having arrived must be thorough improvement the time.
To the existing 20 years history of the improvement of chromate waste water, middle nineteen sixties, great majority adopt chemical method, as FeS reduction method, FeSO
4Reduction method is removed Cr (VI) to reach emission standard, does not have solution to abandon gradually but the sludge quantity of these methods is big.Use BaCrO thereafter
4The precipitator method, but this method is also because of collecting difficulty, chromium again can not reuses, use lessly, the seventies, chemical method has had new development, ion exchange method, electrolytic reduction is handled in the switch-back outward by line and is handled, reduced sludge quantity, floor space and investment all reduce, but the reuse of part rinse water.But the Fe of electrolytic process, Cr mud also can't further be handled, and this method is serious to equipment corrosion, and power consumption is big, applies difficulty.Finally, whole electroplating industry has almost all adopted ion exchange method to handle waste water, and this is considered to administer the standard method of electroplating wastewater.In big area practice, prove that this method investment is big, difficult management, the chromic acid of recovery can not direct reuse, and zero release does not still realize.The eighties has reverse osmosis method, electroosmose process, and film evaporation method, the air supporting method, activated carbon method, ferrite process and extraction process etc. occur in succession, and electrolytic process and ion exchange method have new development again.It is few wherein to regurgitate pouring countercurrent rinsing method water consumption, Cr
6+The reclamation rate height has been realized closed cycle, but that this method is only applicable to volume of bath solution is little, the orthoscopic plating machine that steam output is few, and also investment is big, and regulation and control are difficult, promote being restricted in vast small towns Electroplate Factory.Improvement to chrome waste water remains the Conservation Scientist in for some time from now on, metallurgy, the problem of joint researches such as chemical engineering teacher and biologist.
Once with decolouring bacillus (Bac.Dechromaticans) anaerobic treatment chromate waste water, every gram dry biomass can be with 2.1 gram K in 3 days for Luo Manenke (Romanenko) etc.
2CrO
4In Cr
6+Be reduced to Cr
3+H.C. Xie Erbo Cray promise husband waits the bacterial strain with AeromonasDechromaticans KC-11, makes carbon source with Sweet natural gas or ethane, purifies 500ml chrome liquor (24.0mg Cr
6+/ L) its purification efficiency can be the same with activated sludge process, and can shorten the clarification time, reduce expense 1.1-1.5 doubly; A.M.Marques etc. have reported with pseudomonas aeruginosa (Pseudomonas aeruginosa) chromium in the substratum is reduced; Y.Sag etc. have studied exsiccant and have given birth to the moving glue bacterium of branch (Zooglea ramigera) under 2,25 ℃ of conditions of pH, to Cr
6+Adsorption rate be up to 20%; Report such as the K.Komori reducible chromic salt of enterobacter cloacae; No. 81001 bacterial strains of usefulness chromate reduction bacterium such as Sun Guoyu add the active sludge treatment waste electroplating liquor containing chromium certain effect.But these researchs only limit to adopt single bacterial strain, and belong to laboratory test.
In view of above-mentioned problem and shortage in existence aspect technology and the research, it is simple that task of the present invention provides a kind of processing chromium-electroplating waste water equipment, and primary purification can reach emission standard, reclaims Cr simultaneously
6+, not causing secondary pollution, energy consumption is little, and cost of investment is significantly less than the microbial method new technology of existing chemical method.
Present technique is according to the function of microorganism and the characteristics of electroplating wastewater, proposed to reclaim the science scheme of heavy metal in the waste water based on the microbially decontaminate of function yeast, be that function yeast is grown in cheap matrix, its meta-bolites becomes trivalent chromium with the hexavalent chrome reduction in the chromium-electroplating waste water, forming chromium hydroxide compound flocculation sediment comes out, thereby reach the purpose of purifying liquid waste, sedimentary chromium slag is through simple chemical treatment, promptly recyclable chromium.
Technical solution of the present invention is:
Studied in great detail from electroplate Fusobacterium nucleatum (Fusobacteriumnucleatum) in the mud, Paracoccus denitrificans (Paracoccus denitrificans), blunt like Fahrenheit bacterium (Edwardsiella tarda), peptococcus anaerobius (Peptococcus anaerobius) to the resistance of metal, purify on condition, kinetics and purification mechanism, combination, antagonism and the complementary function basis of chromium (VI), with this Fusobacterium nucleatum, Paracoccus denitrificans, bluntly like to such an extent that Fahrenheit bacterium, four kinds of bacterium of peptococcus anaerobius are formed composite bacteria.
2. utilize composite bacteria in process of growth, its meta-bolites reduction is with HCrO
4 -, Cr
2O
7 2-, CrO
4 2-The Cr (IV) that form exists is Cr (III), forms Cr (OH)
3Precipitation, with the oxyhydroxide of other metal ions of thalline, sulfide coagulating sedimentation and being removed, and portion C r
3+, can by the thalline surface-OH ,-CHO ,-SH ,-COOH ,-groups such as NH absorption and being removed.
Concrete technical process is:
The first step, will by Fusobacterium nucleatum, Paracoccus denitrificans, blunt like the composite bacteria formed of Fahrenheit bacterium, peptococcus anaerobius, join in the growth matrix pond with common sanitary wastewater or industrial beer waste water or industrial food waste water and carried out cultivation 24 hours;
Second step joined cultured composite bacteria liquid in the treating pond I that fills the pending chrome waste water of certain volume and other metallic wastewaters, after 3 hours, the bacterium waste mixed solution sent in the treating pond II stopped 13 hours;
In the 3rd step, the liquid that will stop in the treating pond II after 13 hours is sent into settling tank precipitation 8 hours, and supernatant liquor passes through filtering emission then, the Cr (OH) under the precipitation
2And Cu (OH)
2, Ni (OH)
2, Zn (OH)
2Precipitation is used for reclaiming, and the part thalline is then accepted reuse again in settling tank and the treating pond.
After whole process was handled, the purification rate of chromium reached more than 99% in the electroplating wastewater, and chromium recovery ratio is more than 80%.Whole process flow is seen accompanying drawing.In the accompanying drawing: 1 baterial cultivation pool; 2 pending electroplating wastewaters are deposited the pond; 3 treating pond I; 4 treating pond II; 5 settling tanks; 6 sand filters; The recovery of 7 chromium and other metals; 8 waste water of qualified discharge.
Compared with the prior art the present invention has the following advantages:
1. adaptability: it is strong that chromium concn in the waste water is changed adaptability, and handling wastewater flow rate can greatly can be little, and the pH of waste water and waste water composition are changed also adaptability preferably.
2. the water quality after handling: can guarantee to realize chromium qualified discharge in the treating water.It is good to handle the back effluent quality, can reuse.
3. mud is heavy: the sludge quantity of generation only is 1% of a chemical method, the recyclable utilization of chromium, and non-secondary pollution has been accomplished the thorough improvement to chrome waste water.
4. substratum: growth matrix can be common sanitary sewage, also can be industrial beer waste water, industrial food waste water, and these wastewater sources are convenient, do not need special funds.
Embodiment 1:
Certain medium-sized Electroplate Factory, 5 tons of day discharging chromium plating wastewaters, chromium (VI) fluctuation of concentration scope is a 65.4-192.0mg/L treating pond I, molten the amassing of II respectively is 0.58 cubic metre.
According to above-mentioned condition, technological design is by above-mentioned process flow sheet.It is 0.5 ton that day is handled the chrome waste water amount, and growth matrix is got food plant wastewater, BOD value scope 500-1400mg/L, and COD value scope 1500-2000mg/L, the bacterial concentration of adding is 1.6 * 10
7Individual/ml.Sampling monitoring after 24 hours.
The water outlet monitoring result:
Chromium (VI) content: be lower than 0.5mg/L
Total chrome content: be lower than 1.0mg/L
BOD concentration: be lower than 60mg/L
COD concentration: be lower than 100mg/L
Composite bacteria amount: normal
Effluent quality meets GB GB8978-88 integrated wastewater discharge standard fully.
Embodiment 2:
Certain large-scale Electroplate Factory, day discharging chromium-electroplating waste water 1-100 ton, chromium (VI) fluctuation of concentration scope is 1-100mg/L, the treating pond I, the II volume respectively is 50 cubic metres.
According to above-mentioned condition, technological design is by above-mentioned process flow sheet.Handle 1-100 ton electroplating wastewater day, bacterial classification is a composite bacteria, and growth matrix is common sanitary sewage, and adding bacterial concentration is 1.6 * 10
7/ ml, after 3 hours, sampling monitoring.
The water outlet monitoring result:
Chromium (VI) content: be lower than 0.1mg/L
Total chrome content: be lower than 0.5 mg/L
Zinc content: be lower than 0.4 mg/L
Nickel content: be lower than 0.2 mg/L
Copper content: be lower than 0.1 mg/L
Indexs such as the BOD of water outlet, COD, SS, pH, colourity all are lower than GB GB8978-88 integrated wastewater discharge standard.
Claims (2)
1. use the method for the treatment of electroplating waste water with micro-organism, it is characterized in that: the composite bacteria of using in the treating processes is by Fusobacterium nucleatum (Fusobacterium nucleatum), Paracoccus denitrificans (Paracoccus denitrificans), blunt like Fahrenheit bacterium (Edwardsiella tarda), peptococcus anaerobius (Peptococcus anaerobius) is formed by four kinds of bacterium, the technical process of its processing is: earlier with common sanitary sewage, industry beer waste water or industrial food waste water carry out cultivation and join after 24 hours and fill in the pending electroplating wastewater pond, after primary treatment, carry out secondary treatment again, water after the processing enters settling tank and precipitates, the supernatant liquor of post precipitation enters sand filter and filters back discharging, chromium that precipitates and nickel, copper, zinc reclaims.
2. press the method for the described treating electroplating waste water with micro-organism of claim 1, it is characterized in that: the condition that purifies electroplating wastewater is pH 5.0-7.5, temperature is 15-30 ℃, the required residence time of whole process of handling is: purifying for the first time is 3 hours, purifying for the second time is 13 hours, is precipitated as 8 hours in settling tank.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 93106616 CN1047155C (en) | 1993-06-11 | 1993-06-11 | New technology for treating electroplating waste water with micro-organism |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 93106616 CN1047155C (en) | 1993-06-11 | 1993-06-11 | New technology for treating electroplating waste water with micro-organism |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1096769A CN1096769A (en) | 1994-12-28 |
| CN1047155C true CN1047155C (en) | 1999-12-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 93106616 Expired - Lifetime CN1047155C (en) | 1993-06-11 | 1993-06-11 | New technology for treating electroplating waste water with micro-organism |
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Families Citing this family (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100424167C (en) * | 2002-12-04 | 2008-10-08 | 上海一本生命科技工程有限公司 | YB microbe function fungus and domestic organic garbage treating machine |
| CN1327039C (en) * | 2004-02-06 | 2007-07-18 | 赵开方 | Technology for treating electroplating effluent by biochemical process |
| CN100434197C (en) * | 2004-08-03 | 2008-11-19 | 中国科学院过程工程研究所 | Chromic slag treatment method of detoxifying hexavalent chromium directly by biologic method |
| CN100410190C (en) * | 2005-08-25 | 2008-08-13 | 中南大学 | Method of processing high concentration basic chromium-containing wastewater with bacteria |
| CN100552019C (en) * | 2006-05-23 | 2009-10-21 | 北京未名凯拓作物设计中心有限公司 | One strain denitrogen paracoccus and cultural method thereof and application |
| CN100545097C (en) * | 2007-04-12 | 2009-09-30 | 同济大学 | A kind of active sludge microorganism that utilizes is removed chromic method in the sewage |
| CN103073123B (en) * | 2012-12-28 | 2014-06-25 | 广东威迪科技股份有限公司 | Metal plating wastewater recycle using and recycling technology process |
| CN103397340B (en) * | 2013-08-09 | 2016-08-03 | 内蒙古科技大学 | Utilize the method that microorganism electrolysis cell reclaims nickel from nickel-containing waste water |
| CN105967464B (en) * | 2015-07-26 | 2021-04-27 | 佛山市顺德区环洁水处理有限公司 | Method for removing chromium-containing sewage pollutants |
| CN105692872B (en) * | 2016-04-25 | 2020-11-27 | 邱宏声 | Method for removing zinc ions in electroplating wastewater by using pulsed high-voltage electricity-microorganism flocculation reaction tank |
| CN108059309A (en) * | 2018-01-30 | 2018-05-22 | 深圳职业技术学院 | A kind of plating method for processing organic wastewater and device |
| CN111573969A (en) * | 2020-04-30 | 2020-08-25 | 鞍钢众元(鞍山)环保有限公司 | Combined biological treatment method for high-concentration COD chromium-containing electroplating cleaning wastewater |
| CN113023902B (en) * | 2021-03-01 | 2021-12-21 | 同济大学 | Method for promoting removal of hexavalent chromium through co-culture of paracoccus denitrificans and Shewanella |
-
1993
- 1993-06-11 CN CN 93106616 patent/CN1047155C/en not_active Expired - Lifetime
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| Publication number | Publication date |
|---|---|
| CN1096769A (en) | 1994-12-28 |
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