CN101172688B - Method for removing heavy metal in electroplating waste - Google Patents
Method for removing heavy metal in electroplating waste Download PDFInfo
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- CN101172688B CN101172688B CN2007100714622A CN200710071462A CN101172688B CN 101172688 B CN101172688 B CN 101172688B CN 2007100714622 A CN2007100714622 A CN 2007100714622A CN 200710071462 A CN200710071462 A CN 200710071462A CN 101172688 B CN101172688 B CN 101172688B
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Abstract
The invention provides a method of removing the heavy metal in electroplating waste water, and belongs to the technical filed of environmental protection. Electroplating waste water is waste water containing chrome (Cr), waste water containing nickel (Ni), waste water containing cadmium (Cd), waste water containing copper (Cu), waste water containing zinc (Zn), waste water containing aurum (Au) and waste water containing argentums (Ag), or mixed-heavy metal waste water containing various heavy metals. 2 to 5 grams of tanning wet sludge is added into each liter of electroplating waste water; quickly stirring for 20 to 30 minutes and resting for 30 minutes, after the suspended sludge particles are settled, the solid is separated from the liquid; the supernatant solution can be discharged, and the sludge is dehydrated and compressed and then performed harmless treatment. The tanning wet sludge is the sludge produced during producing the raw hide, with 50 to 60 percent of water ratio, 30to 50 percent of crude protein and 27 to 44 percent of cellulose.
Description
Technical field
The invention belongs to environmental protection technical field, relate to the treatment technology of pollutant effluents, particularly a kind of with the dirty green technology of dirt system, be specially the removal method of heavy metal in a kind of electroplating wastewater.
Background technology
According to statistics, the electroplating wastewater discharge capacity in the whole nation is 4 * 10 at present
8Ton/a, the discharge capacity that economize in Guangdong, Zhejiang and Jiangsu etc. is maximum.The composition of electroplating wastewater is very complicated, and except that containing cyanogen (CN-) waste water and acidic and alkaline waste water, heavy metal wastewater thereby is to electroplate the great waste water classification of industry potential hazard property.Classify according to contained heavy metal element in the heavy metal wastewater thereby, generally can be divided into and contain chromium (Cr) waste water, nickeliferous (Ni) waste water, contain cadmium (Cd) waste water, cupric (Cu) waste water, contain zinc (Zn) waste water, contain gold (Au) waste water, argentiferous (Ag) waste water etc.Its processing method has chemical precipitation method, flocculent precipitation, electrolysis, ion-exchange and reverse osmosis membrane, biochemical process.Chemical method and flocculent precipitation operating cost are high, and secondary pollution is serious; Electrolysis investment and operating cost are lower, but treatment effect is not good enough, does not see the certain scale case history; Ion-exchange and reverse osmosis membrane treatment effect are best, but investment is big, and expense is higher, and the complicated operation disposal ability is restricted; The investment and the operating cost of biochemical process are lower, and treatment effect is also more satisfactory, but sludge quantity is big, and treatment effect receives the influence of low temperature and cyanide bigger.In general, electroplating wastewater is the industrial wastewater of one type of big high-pollution load of intractability.
China's leather industry development is very rapid, and every processing 1t rawhide produces 150kg mud approximately in the process hides process, and China produces leather-making mud 3.75 ten thousand t every year approximately, accounts for national mud total amount about 1/10.For leather-making mud, modes such as general at present employing landfill, burning, stacking are handled, and not only take valuable land resource, but also possibly cause secondary pollution to environment.
Summary of the invention
The objective of the invention is to remove the heavy metal in the electroplating wastewater, with the preliminary treatment of simple and effective way completion cheaply to electroplating wastewater.
The removal method of heavy metal in the electroplating wastewater of the present invention; Described electroplating wastewater is for containing chromium (Cr) waste water, nickeliferous (Ni) waste water, contain cadmium (Cd) waste water, cupric (Cu) waste water, contain zinc (Zn) waste water, contain gold (Au) waste water and argentiferous (Ag) waste water etc., or contains the mixture-metal waste water of various heavy.Add 2～5 by every liter of electroplating wastewater and restrain the wet mud of leather, add the wet mud of process hides, stirred fast 20～30 minutes; Left standstill 30 minutes, mud granule thing post precipitation to be suspended carries out Separation of Solid and Liquid; Supernatant can discharge, harmless treatment separately after the sludge dewatering compression.
The wet mud of process hides according to the invention is the mud that the processing rawhide produces in the process hides process, and the moisture content of the wet mud of said process hides is 50～60%, and crude protein content is 30～50%, content of cellulose 27～44%.
The present invention program further narrates as follows:
In containing the electroplating wastewater of heavy metal; The dosage that adds the wet mud of 2～5g process hides with 1000ml waste water adds the wet mud of an amount of process hides, stirs fast 20～30 minutes, leaves standstill 30 minutes; Particle post precipitations such as mud to be suspended; Carry out Separation of Solid and Liquid, supernatant can reach integrated wastewater discharge standard, carries out harmless treatment in addition after the sludge dewatering compression and disposes.
Leather-making mud is rich in organic matter; Wherein crude protein content is 30～50%; Content of cellulose 27～44%, and quite high sulfoprotein, natural organic matters such as protein are arranged is typical colloidal solid thing; Be the good complexing agent or the chelating agent of heavy metal in the water body, wherein the adsorption capacity of sulfoprotein is far above other commercial adsorbents.After this type colloidal substance is suspended in the heavy metal ion in water body and a large amount of absorption waste water; Because the electric charge of colloid surface can descend with the surface; Colloid takes place to assemble and sedimentation; The colloid that the cellulose of high-load acts on gathering in the leather-making mud makes to be assembled settlement action and strengthens, and then reaches heavy metal wastewater thereby and purify and the mud recovery, reaches the purpose of waste resource second use.
Advantage:
1. technology is simple; Do not increase any equipment investment, convenient management: the present invention substitutes commercial adsorbent and flocculant with leather-making mud, and its technique for applying is identical with the pretreating process of present electroplating wastewater; Do not increase any optional equipment and structures, easy to operate.
2. the environmental protection policy that meets country: the present invention utilizes the discarded object leather-making mud through as adsorbent, can remove the heavy metal more than 90%, and makes processing back water outlet satisfy corresponding discharge standard, realizes qualified discharge.The basic principle that meets Ecological Industrial and recycling economy.
3. saving cost, environmental protection: leather-making mud this as harmful solid waste, before it being carried out necessary securityization and harmless treatment disposal; As the sorbent treatment electroplating wastewater, and its applicable pH value wide ranges, need not to regulate raw wastewater pH; Sedimentation is rapid, to the advantages of good adsorption effect of heavy metal.
Application prospect
Material Used of the present invention is a bazardous waste; Its applied technical procedure is simple, is particularly suitable for the resource circulation utilization of the neighbour industrial park of electroplating enterprise and leather-making enterprises, extensive reduction of discharging, energy-saving and cost-reducing; Alleviating leather-making enterprises and electroplating enterprise blowdown pressure; When reducing the enterprise production cost, also can save social resources, have more wide application prospect.
The specific embodiment
Instance 1 is that 56% wet leather-making mud 350kg joins in the copper-contained electroplating waste water of 100000L with moisture content; Speed with 150rpm stirs 30min; Leave standstill 30min, particle post precipitations such as mud to be suspended enter sewage webmaster, sludge dewatering compression with supernatant.The content of heavy metal copper drops to 1.65mg/l by the 15.45mg/l of raw wastewater in the supernatant after treatment.
Instance 2 is that 60% wet leather-making mud 250kg joins in the Zinc-containing electroplating waste water of 50000L with moisture content; Speed with 100rpm stirs 20min; Leave standstill 40min, particle post precipitations such as mud to be suspended enter sewage webmaster, sludge dewatering compression with supernatant.The content of heavy metal zinc drops to 0.65mg/l by the 12.38mg/l of raw wastewater in the supernatant after treatment.Supernatant (water outlet) reaches three grades of discharge standards of national sewage comprehensive discharge.
Instance 3 is that 50% wet leather-making mud 200kg joins the integrative electroplating waste of 100000L (Cr is 7.38mg/l with moisture content; Cu is 0.68mg/l; Ni is 2.07mg/l, and Zn is 3.04mg/l) in, with the speed stirring 60min of 50rpm; After staticly settling, supernatant is entered sewage webmaster, sludge dewatering compression.Heavy metal drops to Cr0.04mg/l, Cu0.0.10mg/l, Ni0.05mg/l, Zn1.97mg/l respectively in the supernatant after treatment.Supernatant (water outlet) reaches three grades of discharge standards of national sewage comprehensive discharge.
Claims (1)
1. the removal method of heavy metal in the electroplating wastewater, described electroplating wastewater be for containing chromium (Cr) waste water, nickeliferous (Ni) waste water, contain cadmium (Cd) waste water, cupric (Cu) waste water, contain zinc (Zn) waste water, contain gold (Au) waste water and argentiferous (Ag) waste water, or contain the mixture-metal waste water of various heavy; It is characterized in that: add 2～5 by every liter of electroplating wastewater and restrain the wet mud of leather; Add the wet mud of process hides, stirred fast 20～30 minutes, left standstill 30 minutes; Mud granule thing post precipitation to be suspended; Carry out Separation of Solid and Liquid, supernatant can discharge, harmless treatment separately after the sludge dewatering compression;
The wet mud of said process hides is the mud that the processing rawhide produces in the process hides process, and the moisture content of the wet mud of said process hides is 50～60%, and crude protein content is 30～50%, content of cellulose 27～44%, and each components contents summation is 100%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007100714622A CN101172688B (en) | 2007-09-28 | 2007-09-28 | Method for removing heavy metal in electroplating waste |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007100714622A CN101172688B (en) | 2007-09-28 | 2007-09-28 | Method for removing heavy metal in electroplating waste |
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| Publication Number | Publication Date |
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| CN101172688A CN101172688A (en) | 2008-05-07 |
| CN101172688B true CN101172688B (en) | 2012-07-25 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2007100714622A Expired - Fee Related CN101172688B (en) | 2007-09-28 | 2007-09-28 | Method for removing heavy metal in electroplating waste |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101492212B (en) * | 2008-11-25 | 2015-07-08 | 林挺 | Environment friendly electroplating waste processing method |
| CN101717134B (en) * | 2009-12-04 | 2011-05-18 | 浙江师范大学 | Method for treating zinc-containing electroplating wastewater and recovering zinc by electrolysis |
| CN102503054A (en) * | 2011-11-02 | 2012-06-20 | 长沙华清泰污泥处理科技有限公司 | Textile dyeing sludge processing method for removing heavy metal and dehydrating |
| CN103641209B (en) * | 2013-11-08 | 2015-12-09 | 华南理工大学 | A kind of copper-containing wastewater combined electrolysis groove treatment process |
| CN104592397B (en) * | 2015-01-24 | 2018-01-23 | 浙江工商大学 | Thioglycolic acid modified cellulose, its preparation method and application |
| CN106587110B (en) * | 2016-11-15 | 2018-02-02 | 北京中水信科技有限公司 | A kind of method for removing dedusting ash and extracting residual heavy metal ion during sylvite |
| CN107930605B (en) * | 2017-11-30 | 2021-05-04 | 重庆精创联合环保工程有限公司 | Adsorbent for adsorption treatment of electroplating wastewater |
Citations (3)
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| CN1122776A (en) * | 1994-11-05 | 1996-05-22 | 四川省遂宁市环保实业公司 | Highly efficient composite coagulant for industrial wastewater treatment |
| CN1718551A (en) * | 2005-01-21 | 2006-01-11 | 桂林工学院 | Method of preparing active red mud by mechanical force activating process |
| CN1772653A (en) * | 2005-09-21 | 2006-05-17 | 陈勇 | Stuffing and configuration of anaerobic reactor |
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- 2007-09-28 CN CN2007100714622A patent/CN101172688B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1122776A (en) * | 1994-11-05 | 1996-05-22 | 四川省遂宁市环保实业公司 | Highly efficient composite coagulant for industrial wastewater treatment |
| CN1718551A (en) * | 2005-01-21 | 2006-01-11 | 桂林工学院 | Method of preparing active red mud by mechanical force activating process |
| CN1772653A (en) * | 2005-09-21 | 2006-05-17 | 陈勇 | Stuffing and configuration of anaerobic reactor |
Non-Patent Citations (2)
| Title |
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| 游伟民等.制革污泥资源化利用技术研究进展.《皮革化工》.2005,第22卷(第3期), * |
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