Sewage treatment method and sewage treatment system

A sewage treatment method and sewage technology, which are used in flotation water/sewage treatment, neutralized water/sewage treatment, oxidized water/sewage treatment, etc., can solve the waste of valuable metal resources, cannot be recycled, harm the ecological environment, etc. problems, to achieve the effect of reducing treatment costs, saving pharmaceutical dosage, and high recovery value

Pending Publication Date: 2017-06-20
湖南求是检测科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method ensures that the acidic sewage with heavy metal content fluctuations (especially high arsenic content) meets the discharge standards, but the produced sulfide precipitation and iron salt c

Method used

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  • Sewage treatment method and sewage treatment system

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0049] Example 1:

[0050] A sewage treatment method of the present invention treats 1L of a non-ferrous smelting acidic sewage, in which the acid mass fraction (calculated as sulfuric acid) is 1.5%, the arsenic ion concentration is 125.163mg / L, the lead ion concentration is 4.518mg / L, and the copper ion concentration is 36.35mg / L, the cadmium ion concentration is 21.896 mg / L, the nickel ion concentration is 80.089 mg / L, the zinc ion concentration is 50.949 mg / L, and the sulfate concentration is 35000 mg / L. The processing method includes the following steps, the process is as follows figure 1 Shown:

[0051] (1) Oxidation-neutralization reaction: add hydrogen peroxide (industrial grade 30wt% content) 280mg, ferrous sulfate heptahydrate (industrial grade 56wt% content) 1700mg to the acidic sewage after homogenization, then add Mg(OH) ) 2 600mg, adjust the sewage pH to 3.5, after 2 hours of reaction, filter and separate to obtain 350mg of filter residue, the main component is iron ...

Example Embodiment

[0057] Example 2:

[0058] The sewage treatment method of the present invention treats 1L of a non-ferrous smelting acidic sewage, in which the acid mass fraction (calculated as sulfuric acid) is 2.8%, the arsenic ion concentration is 820.51mg / L, the lead ion concentration is 7.68mg / L, and the copper ion concentration is 56.75mg / L, cadmium ion concentration is 45.968mg / L, nickel ion concentration is 127.89mg / L, zinc ion concentration is 73.493mg / L. The processing method includes the following steps, the process is as follows figure 1 Shown:

[0059] (1) Oxidation-neutralization reaction: Add 1.8 g of hydrogen peroxide (industrial grade 30wt% content) and ferrous sulfate (specifically, ferrous sulfate heptahydrate, industrial grade 56wt% content) into the acidic sewage after homogenization treatment. After g, add Mg(OH) 2 1.1g, adjust the pH of the sewage to 3.6, after 2 hours of reaction, filter and separate to obtain 2.1g of filter residue, the main component is iron arsenate; t...

Example Embodiment

[0065] Example 3

[0066] A sewage treatment system of the present invention. The treatment methods of Embodiment 1 and Embodiment 2 can be implemented by using the treatment system, but are not limited to this system.

[0067] Such as figure 2 As shown, the sewage treatment system includes an oxidation and neutralization reaction tank 1, a filter 5, a vulcanization reaction tank 2, a first filter press 6, a neutralization reaction tank 3, and an air flotation device 4 connected in sequence. The air flotation device 4 is provided with At the first outlet for discharging the alkaline neutralizer obtained by air flotation separation, the first outlet of the air flotation device 4 is in communication with the oxidation neutralization reaction tank 1.

[0068] In this embodiment, a gas-liquid mixing tube 10 is provided in the air flotation device 4, and the gas-liquid mixing tube 10 is provided with a nano-distribution head 9 near the outlet end. The gas-liquid mixing tube 10 is used ...

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Abstract

The invention discloses a sewage treatment method and a sewage treatment system. The treatment method comprises the following steps: adding an oxidant, a ferrous salt and an alkaline neutralizer to acidic sewage, carrying out a reaction, filtering the obtained sewage, adding sodium sulfide to the obtained filtrate, carrying out a reaction, carrying out press filtration, adding lime milk to the obtained filtrate, carrying out a reaction, and carrying out air floatation separation and post-treatment. The treatment system comprises an oxidation and neutralization reaction tank, a filter, a sulfuration reaction tank, a first filter press, a neutralization reaction tank and an air flotation device which are sequentially connected, and the first outlet of the air floatation device communicates with the oxidation and neutralization reaction tank. The treatment method and the treatment system have the advantages of high-efficiency treatment of acidic sewage with high content of heavy metals, respective enrichment of arsenic and other heavy metals, recycling and harmless utilization of hazardous waste residues, high recovery value and no secondary pollution.

Description

technical field [0001] The invention belongs to the technical field of heavy metal acid sewage treatment for environmental protection, and in particular relates to a sewage treatment method and a treatment system. Background technique [0002] Most metal minerals such as copper, nickel, lead, and zinc in non-ferrous smelting exist in the form of sulfide, and a large amount of sulfur-containing flue gas will be produced during the smelting process, and these sulfur-containing flue gases are mostly made into industrial sulfuric acid. The industrial acid production process of non-ferrous smelting generally uses a wet purification process. The empty tower, packed tower, and dynamic wave equipment used in the purification process will produce a large amount of acidic sewage, which is referred to as sewage in the present invention. In addition to containing a large amount of sulfuric acid, acid sewage also contains impurities such as arsenic, lead, nickel, cadmium, copper, fluorin...

Claims

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Application Information

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IPC IPC(8): C02F9/04C02F101/20C02F101/10
CPCC02F9/00C02F1/001C02F2101/103C02F2101/20C02F1/52C02F1/66C02F1/72C02F1/24
Inventor 谭自强梁学武任恒周桂生李鹏文乐彭懿
Owner 湖南求是检测科技有限公司
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