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: 2005-09-14
株洲冶炼集团有限责任公司
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The above method belongs to the one-stage neutralization method. For the acidic wastewater containing ferrous metal ions, the one-stage neutralization method is difficult to meet the national first-level discharge standards. Therefore, the rivers are still polluted. This is the shortcoming of the one-stage neutralization method.

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

Experimental program
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Effect test

Embodiment 1

[0017] Non-ferrous metal acid wastewater flow rate 400M 3 / hour (continuous flow), wastewater composition (mg / l); Cu3.88, Pb14.63, Cd12.65, Zn139.29, pH value 5.0.

[0018] One-stage lime neutralization: add milk of lime with a concentration of 6% in the mixing tank until the pH value reaches 8.5, take a sample and test the neutralized components (mg / l): Cu0.26, Pb1.22, Cd0.45, Zn17 .86.

[0019] Two-stage polymerized ferric sulfate precipitation: put 200PPM (equivalent to 80kg / hour) of polymerized ferric sulfate with a concentration of 10% into the mixing tank, and take a sample to test the composition of the clarified liquid after the polymerized precipitation (mg / l): Cu0.20, Pb0.91 , Cd0.08, Zn1.43, pH 8.5.

example 2

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

[0022] The concentration of milk of lime is 6%, until the pH value reaches 7.5, the composition of the clarified liquid after neutralization (mg / l) 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 and testing the clarified liquid composition (mg / l) after polymerization and precipitation: Cu0.28, Pb0.97, Cd0.07, Zn1.93, pH value 7.5, Feeding and sampling locations are the same as in 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%, until the pH value reaches 9.0, the composition of the clarified liquid after neutralization (mg / l) is sampled and tested: Cu0.28, Pb1.31, Cd0.16, Zn9.55, and the pH value is 9.0.

[0027] Concentration of 20% polyferric sulfate 200PPM, sampling and testing the composition of the clarified liquid after polymerization precipitation (mg / l): Cu0.24, Pb1.20, Cd0.07, Zn3.23, pH value 9.0, feeding and sampling locations are the same as examples 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 Patents(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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