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Method for treating acidic waste-water contg. nonferrous metals

A technology for acidic wastewater and non-ferrous metals, applied in chemical instruments and methods, multi-stage water/sewage treatment, water/sludge/sewage treatment, etc. To achieve the effect of reducing the amount of pollutants

Inactive Publication Date: 2003-05-21
株洲冶炼集团有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0003] The above-mentioned method belongs to one-stage neutralization method. For acid wastewater containing ferrous metal ions, when the content of metal ions is high, it is difficult for one-stage neutralization method to meet the national first-level discharge standard. Therefore, there is still pollution to rivers, which is Disadvantages of a period of neutralization

Method used

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  • Method for treating acidic waste-water contg. nonferrous metals
  • Method for treating acidic waste-water contg. nonferrous metals

Examples

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Effect test

example 1

[0016] Referring to the accompanying drawings, the accompanying drawings are a process flow chart of the present invention's two-stage method for treating nonferrous metal acidic wastewater. The acidic wastewater containing ferrous metal ions enters the mixing tank after sedimentation and homogenization, and milk of lime is added to the mixing tank. , to carry out a period of lime neutralization, after neutralization, the liquid is sent to the reaction tank and the inclined plate sedimentation tank, and the supernatant of the sedimentation tank is put into the mixing and stirring tank, and polyferric sulfate is added to the stirring tank to carry out the second stage of polyferric precipitation, and the mixed liquid enters another The inclined plate sedimentation tank, the supernatant is returned to use or discharged, the bottom flow of the homogenization tank and the bottom flow of other processes enter the filter press for filtration, the filter residue is sent to the producti...

example 2

[0021] Wastewater composition (mg / l): Cu1.82, Pb9.40, Cd7.12, Zn138.48, pH value 3.5.

[0022] The milk of lime concentration is 6%, until the pH value reaches 7.5, the composition of the supernatant (mg / l) after neutralization is sampled and tested: Cu0.40, Pb1.04, Cd0.16, Zn2.14, and the pH value is 7.5.

[0023] Concentration of 5% polyferric sulfate 70PPM (equivalent to 28kg / hour), sampling test supernatant composition after polymerization precipitation (mg / l): Cu0.28, pb0.97, Cd0.07, Zn1.93, pH value 7.5 , and the rest are the same as Example 1.

example 3

[0025] Wastewater composition (mg / l): Cu5.65, Pb11.79, Cd6.89, Zn629.65, PH value 4.0.

[0026] The concentration of milk of lime is 10%, and until the pH value reaches 9.0, the composition of the supernatant (mg / l) after neutralization is sampled and tested: Cu0.28, Pb1.31, Cd0.16, Zn9.55, and the pH value is 9.0.

[0027] The polyferric sulfate 200PPM of concentration 20%, the supernatant liquid composition (mg / l) after the sampling assay polymerization precipitation: Cu0.24, Pb0.92, Cd0.07, Zn2.00, pH value 9.0, all the other are with example 1.

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Abstract

The new process for treating acidic waste water containing non-ferrous metal ions includes two-stage treatment method, one of them adopts lime neutralization treatment step, the lime milk can be added into said acidic waste water to make the pH value of waste water up to 7.5-9, and another method is a ferric polysulfate precipitation treatment step, the ferric polysulfate is added into the supernatant fluid of the waste water, and the pH value of said waste water can be up to 7.5-9.

Description

technical field [0001] The invention relates to a method for treating nonferrous metal acidic wastewater, which belongs to the wastewater treatment process. Background technique [0002] Chinese invention patent 01145534.9 discloses a high-density sludge treatment process for acidic wastewater, which consists of a first reactor, a second reactor, an aeration tank, a settler, a filter press and other equipment systems. The technology of returning sludge and adding a neutralizing agent to it is used to make the neutralizing agent adsorb on the surface of the sludge carrier, and then use this carrier to neutralize the wastewater, so that various metal ions in the wastewater form metals with high density and large particle size Precipitation of hydroxides improves sludge sedimentation efficiency and solid content of sludge, reduces sludge dehydration time, and reduces waste water treatment costs. The invention is suitable for being widely used in steel, mining, chemical industr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/02C02F9/04
Inventor 袁硕夫彭黎胜唐建平李卫红
Owner 株洲冶炼集团有限责任公司
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