Unlock instant, AI-driven research and patent intelligence for your innovation.

Electroplating wastewater treatment method

A treatment method, a technology for electroplating wastewater, applied in metallurgical wastewater treatment, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., can solve problems such as high operating costs, high investment, secondary pollution, etc., and achieve operational Low cost and reduced investment effect

Active Publication Date: 2014-05-28
上海瑞勇实业有限公司
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional electroplating wastewater treatment methods include chemical precipitation, electrolysis, extraction, adsorption, membrane separation, and biological methods, all of which have limitations such as high investment, high operating costs, poor results, and secondary pollution.
At present, the commonly used method is: firstly, chemical precipitation is used to break chromium and cyanide, and alkali or lime is added to precipitate heavy metal ions, and then filtered through quartz sand filter, activated carbon filter, and heavy metal trap, and finally acid is added to adjust the pH to 6. ~9, discharge after meeting the emission standards, this method has the problem that heavy metals cannot be completely precipitated, especially after the implementation of the new standard "Electroplating Pollutant Discharge Standard" (GB21900-2008) in 2008, this method cannot reach the new discharge standard

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Embodiment 1: A kind of treatment method of electroplating wastewater, at first by chemical method broken chromium and broken cyanide, then by adding alkali or lime heavy metal ion, then filter and process by quartz sand filter, activated carbon filter and heavy metal catcher successively, Finally, add acid to adjust ph to 6-9, and discharge after meeting the discharge standard; wherein, after adding alkali or lime precipitation to carry out a precipitation, after precipitating most of the heavy metal ions, the following steps are also included: (1) Add acid to adjust the pH value to 8.5; (2) Add sodium sulfide Na 2 S and ferrous sulfate Fe 2 SO 4 , where Na 2 S and Fe 2 SO 4 Dosing at a ratio of 1:4, reacting for 10 minutes; (3) adding flocculant to precipitate hydroxide to form larger alum flower precipitation, and the precipitated sludge enters the sludge collection tank, and the supernatant is further processed.

Embodiment 2

[0012] Embodiment 2: A kind of treatment method of electroplating waste water, at first by chemical method broken chromium and broken cyanide, add alkali or lime to precipitate heavy metal ion, then filter and process by quartz sand filter, active carbon filter and heavy metal catcher successively, finally Add acid to adjust the pH to 6-9, and discharge after meeting the discharge standard; among them, after adding alkali or lime for precipitation to precipitate most of the heavy metal ions, the following steps are also included: (1) Add acid to adjust the pH value to 8.2 ; (2) adding sodium sulfide Na 2 S and ferrous sulfate Fe 2 SO 4 , where Na 2 S and Fe 2 SO 4 Dosing at a ratio of 1:3.5, reacting for 12 minutes; (3) adding flocculant to precipitate hydroxide to form larger alum flower precipitation, and the precipitated sludge enters the sludge collection tank, and the supernatant is further processed.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses an electroplating wastewater treatment method, which comprises the following steps of: breaking chromium and breaking cyanogens by using a chemical method, and adding alkali or lime to precipitate heavy metal ions; filtering and treating by using a quartz sand filter, an active carbon filter and a heavy metal catcher in turn; and adding acid to regulate the pH to be 6-9, and discharging the wastewater after the treated wastewater meets a discharge standard, wherein after the step of adding the alkali or lime to precipitate the heavy metal ions, the method also comprises the following steps of: (1) adding acid to regulate the pH value to be 8-9; (2) adding sodium sulfide Na2S and ferrous sulfate Fe2SO4 in a ratio of 1:(3-5), and reacting for 8 to 12 minutes; and (3) adding a flocculating agent, so that a hydroxide precipitate forms a larger alumen ustum precipitate, precipitated sludge enters a sludge collecting tank, and supernate is further treated. The method has the advantages of small investment and low operating cost, and can realize stable standard discharge.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment, in particular to a method for treating electroplating wastewater. Background technique [0002] Electroplating is one of the three major polluting industries in the world today. Electroplating wastewater, especially comprehensive electroplating wastewater, has the characteristics of many types of pollutants, complex components, high toxicity and serious hazards. The main pollutants are various heavy metal ions, cyanide, waste acid and waste alkali, etc. Traditional electroplating wastewater treatment methods include chemical precipitation, electrolysis, extraction, adsorption, membrane separation, and biological methods, all of which have limitations such as high investment, high operating costs, poor results, and secondary pollution. At present, the commonly used method is: firstly, chemical precipitation is used to break chromium and cyanide, and alkali or lime is added to precipi...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04C02F103/16
Inventor 张勇安
Owner 上海瑞勇实业有限公司