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A heavy metal sewage treatment agent

A technology for sewage treatment and heavy metals, applied in water/sewage treatment, adsorbed water/sewage treatment, water/sludge/sewage treatment, etc. Chemically stable effect

Active Publication Date: 2021-04-09
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In view of the fact that the residual heavy metals discharged from the factory into the municipal sewage plant exist in suspended, free and complex states at the same time, different methods or water treatment chemicals are required to remove heavy metals in different forms, which increases the difficulty of operation; on the other hand, the existing water treatment chemicals In order to achieve the discharge of heavy metals in industrial wastewater, it is often necessary to overdosing, but excessive dosing in municipal sewage will lead to the collapse of the biochemical system on the one hand, and on the other hand, the residual chemicals in the factory water will increase biological toxicity and endanger environmental health; at the same time, urban sewage plants in my country It has covered the whole country, and the sewage plant is limited by space and operating cost control. It does not have the ability to build additional structures to treat heavy metals and cannot use high-cost treatment methods such as electrochemistry and reverse osmosis membranes.

Method used

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  • A heavy metal sewage treatment agent
  • A heavy metal sewage treatment agent
  • A heavy metal sewage treatment agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Embodiment 1 The influence of pH and heavy metal species on treatment effect

[0019] Take the following heavy metal standard solutions to prepare simulated heavy metal water samples containing mercury (II), lead (II), copper (II), nickel (II), cadmium (II), zinc (II) and manganese (II), respectively.

[0020] The heavy metal treatment agent of this example mainly comprises the following raw materials in parts by weight: 2 parts of anionic polyacrylamide; 5 parts of chitosan; 12 parts of montmorillonite; 15 parts of calcium chloride; 12 parts of sodium alginate; 30 parts of tetraacetic acid; 24 parts of sodium dimethyl dithiocarbamate.

[0021] Specific treatment method: Take 500 ml of three simulated heavy metal water samples, adjust the pH to 5.8, 6.8 and 7.8 in turn, then add 5 mg / L of heavy metal treatment agent, stir and react for 2 minutes, then directly filter with a 0.45 micron filter membrane, using inductive coupling The plasma-mass spectrometer was used to d...

Embodiment 2

[0025] Embodiment 2 The influence of treatment agent of the present invention on biochemical treatment system

[0026] The main process of the first-phase and second-phase treatment facilities of a sewage treatment plant adopts the AAO activated sludge method. The suspended solids in the wastewater entering the plant have a pH value of 6.5-7.5. For heavy metals such as cadmium ions, zinc ions, and manganese ions, the treatment process did not design a heavy metal removal unit, resulting in heavy metals in the effluent exceeding the discharge standard.

[0027] Treatment process: At the end of the biochemical tank, the sludge mixture is dropped from the biochemical tank into the well to add different dosages of heavy metal sewage treatment agents (prepared according to Example 1). Under the turbulent mixing state, fully mix and contact with the wastewater for 5 minutes, and enter the secondary settling tank with the sludge mixture for mud-water separation. Take the effluent fro...

Embodiment 3

[0041] Embodiment 3 Compounding effect of heavy metal sewage treatment agent components of the present invention

[0042] Take the following heavy metal standard solutions to prepare simulated heavy metal water samples containing mercury (II), lead (II), copper (II), nickel (II), cadmium (II), zinc (II) and manganese (II), respectively. The heavy metal treatment medicament of the present invention and the medicament other than the formula ratio of the heavy metal treatment medicament of the present invention are respectively adopted.

[0043] The heavy metal treatment medicament of this example (prepared by Example 1), the medicament A other than the heavy metal treatment medicament formula ratio of the present invention, the medicament B other than the heavy metal treatment medicament formula ratio of the present invention, the composition of A and B is specifically as follows:

[0044] The heavy metal sewage treatment agent A comprises the following raw materials in parts by w...

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Abstract

The invention belongs to the technical field of sewage treatment, and in particular relates to a heavy metal sewage treatment agent. The heavy metal sewage treatment agent comprises the following raw materials in parts by weight: 1-5 parts of anionic polyacrylamide; 2-8 parts of chitosan; 5-15 parts of montmorillonite; 5-20 parts of calcium chloride; 2‑15 parts of sodium; 20‑40 parts of ethylenediaminetetraacetic acid; 10‑30 parts of dialkyldithiocarbamate. It has the characteristics of high efficiency and non-toxicity, short reaction time, convenient operation and no impact on the biochemical treatment system.

Description

Technical field: [0001] The invention belongs to the technical field of sewage treatment, and in particular relates to a heavy metal sewage treatment agent. Background technique: [0002] With the rapid development of industries such as electroplating, chemical industry, metal pickling, metallurgy and electronics, industrial wastewater with high concentrations of heavy metals will be produced during production. After the enterprise adopts necessary pollution control facilities, the content of different heavy metals in wastewater can be significantly reduced to the discharge standard of 0.05-5.0 mg / L, but the concentration of heavy metals is still higher than the acceptance limit of municipal sewage treatment plants. Heavy metals are already a part of municipal sewage. important and common pollutants. At the same time, the lack of advanced industrial wastewater treatment technology, illegal discharge and sudden heavy metal pollution accidents directly lead to the heavy metal...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/00C02F1/28C02F1/42C02F1/52C02F1/54C02F1/56C02F101/20
CPCC02F1/00C02F1/285C02F1/286C02F1/42C02F1/5236C02F1/54C02F1/56C02F2101/20C02F2101/206C02F2209/001C02F2209/06C02F2209/08C02F2209/14C02F2209/16C02F2209/18
Inventor 兰华春张顺安晓强刘锐平吉庆华刘会娟曲久辉
Owner TSINGHUA UNIV
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