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Chelating precipitation method for removing heavy metals from industrial wastewater

A technology for industrial wastewater and heavy metals, applied in chemical instruments and methods, flocculation/sedimentation water/sewage treatment, water pollutants, etc., can solve problems such as low effect, easy dehydration, complex removal of heavy metals, etc., to achieve good results and efficient treatment The method is simple and the effect of flocculation and sedimentation is good

Inactive Publication Date: 2019-02-01
广州市粤新工程技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the deficiencies of the prior art, the present invention provides a chelation precipitation method for removing heavy metals in industrial wastewater, which has the advantages of relatively simple treatment method, good effect of removing heavy metals, good flocculation and sedimentation effect, less sludge and easy dehydration, etc. , which solves the problem of complex and low-efficiency removal of heavy metals in the prior art

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A chelation precipitation method for removing heavy metals in industrial waste water, comprising the following steps:

[0023] S1. The industrial wastewater is transported to the filter tank, and activated carbon is installed inside the filter tank, and the activated carbon is used to absorb the large particles in the industrial wastewater, and the cycle is 2 times;

[0024] S2. Transport the industrial wastewater filtered by activated carbon to the centrifugal filter, so that the smaller particles are separated from the liquid and circulated once;

[0025] S3. Concentrate the industrial waste water filtered by the centrifugal filter into a pool without sundries for treatment;

[0026] S4, preparing the reaction kettle for synthesizing a polymer chelating agent containing a dithiocarbamate group;

[0027] S5. Put the polyethyleneimine aqueous solution and carbon disulfide into the reactor for chemical reaction, the concentration of the polyethyleneimine aqueous solutio...

Embodiment 2

[0032] S1. Transport the industrial wastewater to the filter tank. Activated carbon is installed inside the filter tank, and the activated carbon is used to adsorb the large particles in the industrial wastewater, and the cycle is 3 times;

[0033] S2. Transport the industrial wastewater filtered by activated carbon to the centrifugal filter, so that the smaller particles are separated from the liquid and circulated twice;

[0034] S3. Concentrate the industrial waste water filtered by the centrifugal filter into a pool without sundries for treatment;

[0035] S4, preparing the reaction kettle for synthesizing a polymer chelating agent containing a dithiocarbamate group;

[0036] S5. Put the polyethyleneimine aqueous solution and carbon disulfide into the reactor for chemical reaction, the concentration of the polyethyleneimine aqueous solution is 30%, and the temperature in the reactor is controlled to be 30°C;

[0037] S6, polyethyleneimine has the alkyl group, amino group,...

Embodiment 3

[0041] S1. Transport the industrial wastewater to the filter tank. Activated carbon is installed inside the filter tank, and the activated carbon is used to absorb the large particles in the industrial wastewater, and the cycle is 4 times;

[0042] S2. Transport the industrial wastewater filtered by activated carbon to the centrifugal filter, so that the smaller particles are separated from the liquid and circulated 3 times;

[0043] S3. Concentrate the industrial waste water filtered by the centrifugal filter into a pool without sundries for treatment;

[0044] S4, preparing the reaction kettle for synthesizing a polymer chelating agent containing a dithiocarbamate group;

[0045] S5. Put the polyethyleneimine aqueous solution and carbon disulfide into the reactor for chemical reaction, the concentration of the polyethyleneimine aqueous solution is 30%, and the temperature in the reactor is controlled to be 32°C;

[0046] S6, polyethyleneimine has the alkyl group, amino grou...

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Abstract

The invention relates to the technical field of environmental protection, and discloses a chelating precipitation method for removing heavy metals from industrial wastewater. According to the chelating precipitation method, industrial wastewater is conveyed to a filtering pool, active carbon is arranged inside the filtering pool, the large-particle substances in the industrial wastewater are adsorbed by the active carbon, and the industrial wastewater adsorbed and filtered by the active carbon is conveyed into a centrifugal filter so as to separate the small-volume particles from the liquid; and a chelating agent is placed in the pool of S3, and rapidly reacts with Cu, Zn, Hg, Cd, Pb, Mn, Ni, Cr and other heavy metal ions in the wastewater to generate water-insoluble chelating salts. According to the present invention, the treatment method is simple, the heavy metal ions can be removed only by adding a small amount of the chelating agent, the chelating agent can be strongly chelated with the heavy metals so as to achieve the good heavy metal ion removing effect, and the chelating agent and the heavy metal ions can form good flocs so as to achieve the good flocculation precipitationeffect; and with the method, the amount of sludge is low, and dewatering is easily performed.

Description

technical field [0001] The invention relates to the technical field of environmental protection, in particular to a chelation precipitation method for removing heavy metals in industrial wastewater. Background technique [0002] Heavy metal scavengers can combine heavy metal ions to form stable and insoluble metal chelates. The heavy metal collector has the advantages of simple treatment method and low cost. It can meet the requirements of environmental protection after one treatment under the condition of coexistence of multiple heavy metal ions. It can also fully exert its effect on the coexistence salt and complex salt of heavy metal in wastewater. And it has the characteristics of thick flocs, fast sedimentation, fast dehydration, easy post-treatment, less sludge, stable and non-toxic, and no secondary pollution. Therefore, it overcomes the shortcomings of traditional chemical treatment methods and provides convenience for subsequent treatment. Especially for wastewater...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F1/52C02F1/56C02F101/20
CPCC02F1/004C02F1/283C02F1/5236C02F1/56C02F9/00C02F2101/20
Inventor 郭大海何星亮梁玲玲
Owner 广州市粤新工程技术有限公司
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