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A kind of heavy metal high polyflocculation agent and its application

A flocculant and heavy metal technology, applied in the direction of flocculation/sedimentation water/sewage treatment, metallurgical wastewater treatment, water pollutants, etc., can solve the problems of unsatisfactory effect, slow response, difficult recovery of precious metals, etc., to enhance the net catch ability and Settling ability, strong mesh bridging ability, thick and dense floc effect

Active Publication Date: 2015-12-02
湖南省环境保护科学研究院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The pollution factors of various heavy metal mixed wastewater are complex, and the valence, structure, and form of various heavy metal ions are different, and the concentration varies greatly. The requirements for treatment compliance are relatively strict. Traditional treatment technologies have the disadvantages of using a large amount of treatment agents, high energy consumption, and difficult to control the reaction. , slow reaction, unsatisfactory effect, poor water quality, unstable residue, difficult recovery of precious metals, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Preparation of high aggregation flocculant

[0025] (1) Preparation of polysilicic acid solution: Weigh 6.2g of sodium silicate and dissolve it in 120ml of water to make sodium silicate solution, and then use 4mol / LH 2 SO 4 Titrate to pH 1.5-2.0, stir; leave at room temperature to activate for 1.5 hours.

[0026] (2) Preparation of polysilicate aluminum ferric sulfate solution: 6.28g FeSO 4 ·7H 2 O was dissolved in 29.2ml deionized water to prepare ferric sulfate solution; 3.14gAl 2 (SO 4 )·7H 2 Dissolve O in 14.6mL deionized water to prepare aluminum sulfate solution, mix the two and adjust the alkalization degree B=1.0 with 6mol / L NaOH, slowly add the mixed solution into 120ml polysilicate solution, stir, and react for 1.5-2h; stand still 1. After aging for 2-5 hours, a light brown-red polyaluminum iron silicate solution is obtained;

[0027] (3) Mix 163.8mL polysilicate aluminum ferric sulfate solution with 16.4mL dimethyl diallyl ammonium chloride solution, a...

Embodiment 2

[0029] Preparation of high aggregation flocculant

[0030] (1) Preparation of polysilicic acid solution: Weigh 2.17kg of sodium silicate and dissolve it in 42L of water to make a sodium silicate solution, and then use 6mol / LH 2 SO 4 Titrate to pH 1.5-2.0, stir; leave at room temperature to activate for 1.5 hours.

[0031] (2) Preparation of polysilicate aluminum ferric sulfate solution: 1.148KgFeSO 4 ·7H 2 O was dissolved in 10.22L deionized water to prepare ferric sulfate solution; 1.099KgAl 2 (SO 4 )·7H 2 Dissolve O in 5.11L deionized water to prepare aluminum sulfate solution, mix the two and adjust the alkalization degree B=1.0 with 4mol / L NaOH, slowly add the mixed solution into 42.57L polysilicate solution, stir, and react for 1.5-2h; After placing and aging for 2-5 hours, a light brown-red polyaluminum iron silicate solution is obtained;

[0032] (3) Mix 58.6L polysilicate aluminum ferric sulfate solution with 8.79L dimethyl diallyl ammonium chloride solution, an...

Embodiment 3

[0034] The zinc smelting wastewater of a large smelting enterprise in Hunan Province was selected as the research object. The wastewater contains As, Cd, Zn and other heavy metals, and the pH value is between 5-6 under normal working conditions. Measure 500mL of wastewater, first adjust the pH value of the wastewater to 8-9 with alkali (sodium hydroxide), stir rapidly to mix the wastewater evenly, and then slowly add the high-coagulant flocculant prepared in Example 1 at a slower stirring speed 4mL, mixed completely and left to settle for 30min, the supernatant was taken to detect the concentration of heavy metal ions in the wastewater, in which As decreased from 9.5mg / L to 43.5μg / L, Cd decreased from 24.7mg / L to 65μg / L, Zn decreased from 217mg / L is reduced to 1.1mg / L, which can realize the discharge of wastewater up to standard.

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Abstract

The invention relates to heavy-metal high flocculant and application thereof in the treatment of heavy metal-containing waste water and belongs to the technical field of waste water treatment. The flocculant is obtained by uniformly mixing a polysilicate aluminum ferric sulfate solution and a dimethyl diallyl ammonium chloride solution, wherein the preferable mixing temperature is 70-100 DEG C. The high flocculant is used for treating the low-concentration heavy-metal mixed waste water, and the concentration of the heavy metal can reach the standard so as to be discharged after being subjected to the flocculation deposition; when the high flocculant is used for the high-concentration heavy-metal waste water, a majority of the heavy metal is transferred into the floc after being subjected to the flocculation deposition, so that the load can be alleviated for the subsequent treatment, and the precipitate floc can be returned to a smelting process so as to recycle the heavy metal.

Description

technical field [0001] The invention relates to a heavy metal high polyflocculation agent and its application in the treatment of heavy metal-containing wastewater, which belongs to the technical field of wastewater treatment. Background technique [0002] Heavy metal pollution is one of the serious problems facing my country's water environment, and it is also a hugely harmful water pollution problem. Due to its high toxicity, accumulation and persistence, it seriously threatens the ecology of the water environment and the safety of drinking water. Heavy metal pollution widely comes from mining, mineral processing, smelting, chemical industry, metal processing and other industries. The main pollution factors are lead, cadmium, chromium, mercury, arsenic, zinc, etc. The national "Eleventh Five-Year Plan" water special project also takes heavy metal control in the Xiangjiang River Basin as the main control target. It is very difficult to achieve the standard discharge of va...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/54C02F101/20C02F103/10C02F103/16
Inventor 许友泽宋伟龙成应向唐彬李二平钟振宇付广义邱亚群
Owner 湖南省环境保护科学研究院
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