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Treatment method of acidic heavy metal wastewater

A treatment method and heavy metal technology, applied in metallurgical wastewater treatment, water/sewage treatment, special compound water treatment, etc., can solve the problems of poor treatment effect and high cost of secondary treatment, and improve flocculation performance and molecular bridging ability , Reduce the cost of solid waste treatment, and reduce the effect of usage

Inactive Publication Date: 2020-11-27
NANNING XIAYANG CHEM TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the defects of poor treatment effect and high secondary treatment cost in existing acidic heavy metal wastewater treatment, the invention provides a treatment method for acidic heavy metal wastewater

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] In this embodiment, the acidic heavy metal wastewater discharged from a metallurgical plant is treated. After measurement, in the sewage discharged from the plant, the concentration of copper ions is 12.2 mg / L, the concentration of nickel ions is 8.6 mg / L, and the concentration of cadmium ions is 5.6 mg / L. L, the mercury ion concentration is 0.8mg / L, and the lead ion concentration is 3.5mg / L.

[0025] The specific processing steps are as follows:

[0026] (1) Transport the acidic wastewater containing heavy metals discharged from metallurgy to the mixing tank, and after standing for 30 minutes, continue to transport the upper layer of wastewater to the neutralization tank, add magnesium hydroxide solution with a concentration of 2mol / L, and adjust the pH to 8, After stirring at 60r / min for 10min, let it settle for 60min, and send the upper waste liquid to the mixing tank;

[0027] (2) In the mixing tank according to H 2 o 2 The input amount is 0.3g / L waste liquid, ad...

Embodiment 2

[0037]In this embodiment, the acidic heavy metal wastewater discharged from an electroplating factory is treated. After measurement, in the sewage discharged from the factory, the concentration of copper ions is 10.6 mg / L, the concentration of nickel ions is 10.6 mg / L, and the concentration of cadmium ions is 8.6 mg / L. L, mercury ion concentration is 0.4mg / L, lead ion concentration is 4.5mg / L.

[0038] The specific processing steps are as follows:

[0039] (1) Transport the acidic wastewater containing heavy metals discharged from metallurgy and electroplating to the mixing tank, and after standing for 40 minutes, continue to transport the upper layer of wastewater to the neutralization tank, add magnesium hydroxide solution with a concentration of 3mol / L, and adjust the pH to 10. After stirring at 60r / min for 10min, let it settle for 120min, and send the upper waste liquid to the mixing tank;

[0040] (2) In the mixing tank according to H 2 o 2 The input amount is 0.45g / L ...

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Abstract

The invention provides a treatment method of acidic heavy metal wastewater. The method comprises the following steps: firstly, adding magnesium oxide with less slag amount as an acid removing agent into the acid wastewater to treat the acid wastewater; adjusting a pH value, removing most heavy metals capable of being precipitated and removed, and oxidizing and breaking complex metals and reducinghigh-valence chromium under the cooperative effect of a Fenton reagent; and adding polyacrylamide and polyferric sulfate coagulants to deeply remove the heavy metals. The method is suitable for treating acid heavy-metal-containing wastewater in the industries of metallurgy, electroplating and the like, can realize standard discharge of heavy metal pollutants and greatly reduces subsequent solid waste treatment cost due to the fact that the amount of generated solid waste is greatly reduced; and a magnesium salt in the wastewater can be crystallized and recycled.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, in particular to a treatment method for acidic heavy metal wastewater. Background technique [0002] Electroplating and metallurgy are industrial industries with serious pollution. The wastewater discharged during the production process contains heavy metal ions such as copper, nickel, chromium, highly toxic substances such as cyanide, and a large number of organic pollutants. The water quality is complex and difficult to control. One of the difficult industrial wastewater. The composition of heavy metal wastewater is relatively complex. At present, there are many methods to treat this kind of wastewater at home and abroad, such as chemical precipitation method, electrochemical method, heavy metal capture method, artificial wetland method, etc. For the more harmful acidic heavy metal wastewater, chemical precipitation is currently the most important treatment method. Neutralizers used ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C08F220/56C08F226/02C02F103/16C02F101/20
CPCC02F9/00C08F220/56C02F2101/20C02F2103/16C02F2001/007C02F1/66C02F1/725C02F1/722C02F1/56C02F1/5236C02F2305/026C08F226/02
Inventor 韦明
Owner NANNING XIAYANG CHEM TECH CO LTD
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