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Processing technology for electroplating synthetic wastewater

A comprehensive electroplating and treatment process technology, applied in the fields of metallurgical wastewater treatment, special compound water treatment, multi-stage water treatment, etc., can solve the problems that the treatment of heavy metals is not easy to meet the standard, and the cost is high. Effect

Active Publication Date: 2016-04-20
XIAMEN CLEANED ENVIRONMENT PROTECTING TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is difficult to deal with heavy metals, and the cost is very high

Method used

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  • Processing technology for electroplating synthetic wastewater
  • Processing technology for electroplating synthetic wastewater
  • Processing technology for electroplating synthetic wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A process for treating comprehensive electroplating wastewater, the specific steps are:

[0032] (1) network breaking: add sulfuric acid to the comprehensive electroplating wastewater, adjust the pH value to 2, and stir for 30min; then add a complex breaking agent, and the addition amount is 1.0Kg per ton of waste water, and the reaction is 30min;

[0033] (2) coagulation: adding ferrous sulfate to the waste water to carry out coagulation reaction, the dosage is 0.5Kg per ton of waste water, and the reaction is 30min;

[0034] (3) Adjust pH value: adjust the pH value of wastewater to 11 with NaOH;

[0035] (4) flocculation: add polyacrylamide for flocculation, and the addition amount is 100g per ton of water;

[0036] (5) Precipitation treatment for 2h, after solid-liquid separation, the supernatant liquid is the first-level effluent;

[0037] (6) network breaking: add a network breaking agent in the primary effluent, the amount of addition is 0.5Kg per ton of waste w...

Embodiment 2

[0049] A process for treating comprehensive electroplating wastewater, the specific steps are:

[0050] (1) network breaking: add sulfuric acid to the comprehensive electroplating wastewater, adjust the pH value to 3, and stir for 30min; then add a network breaking agent, and the addition amount is 2.0Kg per ton of waste water, and the reaction is 30min;

[0051] (2) coagulation: adding ferrous sulfate to the waste water to carry out coagulation reaction, the dosage is 0.5Kg per ton of waste water, and the reaction is 30min;

[0052] (3) Adjust pH value: adjust the pH value of wastewater to 10.5 with NaOH;

[0053] (4) flocculation: add polyacrylamide for flocculation, and the addition amount is 200g per ton of water;

[0054] (5) Precipitation treatment for 1h, after solid-liquid separation, the supernatant liquid is the first-level effluent;

[0055] (6) network breaking: adding a network breaking agent in the primary effluent to break the network, the addition amount is 0.5...

Embodiment 3

[0062] A process for treating comprehensive electroplating wastewater, the specific steps are:

[0063] (1) network breaking: add sulfuric acid in the comprehensive electroplating wastewater, adjust the pH value to 2, and stir for 30min; then add Na2S, the addition amount is 2.0Kg per ton of wastewater, and the reaction is 40min;

[0064] (2) coagulation: adding ferrous sulfate to the waste water to carry out coagulation reaction, the dosage is 0.5Kg per ton of waste water, and the reaction is 30min;

[0065] (3) Adjust pH value: adjust the pH value of wastewater to 11 with NaOH;

[0066] (4) flocculation: add polyacrylamide for flocculation, and the addition amount is 150g per ton of water;

[0067] (5) Precipitation treatment for 2h, after solid-liquid separation, the supernatant liquid is the first-level effluent;

[0068] (6) network breaking: adding a network breaking agent in the primary effluent to break the network, the addition amount is 0.5Kg per ton of waste water...

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Abstract

The invention belongs to the field of wastewater treatment, and particularly relates to a processing technology for electroplating synthetic wastewater. The process includes the specific steps of firstly, conducting a first-order reaction, wherein after the electroplating synthetic wastewater is subjected to complex breakage, coagulation, pH value regulation (the pH value is regulated to 10.5-11.5), flocculation, precipitation treatment and solid-liquid separation in sequence, supernatant liquid is first-order output water; secondly, conducting a second-order reaction, wherein after the first-order output water is subjected to complex breakage, coagulation, pH value regulation (the pH value is regulated to 10.5-11.5), an adsorption enhancement reaction, polyacrylamide flocculation, precipitation treatment and solid-liquid separation in sequence, the pH value of the supernatant liquid is regulated to 6-9, and standard discharge is achieved. After the electroplating synthetic wastewater is treated through the technology, the heavy metal content and the COD content in discharged water are both much lower than those of water treated through a traditional technology and meet the limit value standard in the table 3 of the GB21900-2008 Electroplating Pollutant Discharge Standard.

Description

technical field [0001] The invention belongs to the field of wastewater treatment, and in particular relates to a treatment process for comprehensive electroplating wastewater. Background technique [0002] Electroplating comprehensive wastewater generally refers to pre-plating treatment degreasing and pickling wastewater, floor dripping wastewater, various equipment cleaning wastewater, etc. Some manufacturers also include galvanizing and copper plating wastewater. The composition is the most complex, with high COD and contains Heavy metal ions such as copper, zinc, and nickel. The traditional treatment method is generally only chemical coagulation and precipitation, and the heavy metal ions and COD in the effluent cannot meet the current national electroplating pollutant discharge standards. The current domestic treatment of electroplating wastewater is mainly divided into three categories: (1) chromium-containing wastewater: by reducing hexavalent chromium to trivalent c...

Claims

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Application Information

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IPC IPC(8): C02F9/04C02F1/00C02F1/28C02F1/52C02F1/56C02F1/66C02F101/20C02F101/22C02F103/16
CPCC02F1/00C02F1/28C02F1/52C02F1/5245C02F1/56C02F1/66C02F9/00C02F2101/20C02F2101/22C02F2103/16C02F2209/06C02F2301/08C02F2305/00C02F2305/023C02F2305/04
Inventor 黄辉樟
Owner XIAMEN CLEANED ENVIRONMENT PROTECTING TECH CO LTD
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