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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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  • 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 co-precipitation all contain heavy metal arsenic and become hazardous waste that cannot be recycled and used as waste residue. The waste of valuable metal resources endangers the ecological environment

Method used

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  • Sewage treatment method and sewage treatment system
  • Sewage treatment method and sewage treatment system

Examples

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Effect test

Embodiment 1

[0050] A sewage treatment method of the present invention, treating 1L of acidic sewage from a certain colored smelter, wherein the acid mass fraction (calculated as sulfuric acid) is 1.5%, the concentration of arsenic ions is 125.163mg / L, the concentration of lead ions is 4.518mg / L, and the concentration of copper ions is 36.35mg / L, cadmium ion concentration 21.896mg / L, nickel ion concentration 80.089mg / L, zinc ion concentration 50.949mg / L, sulfate radical concentration 35000mg / 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 in the acid sewage after homogenization treatment, add Mg(OH ) 2 600mg, adjust the pH of the sewage to 3.5, react for 2 hours, filter and separate, and obtain 350mg of filter residue, the main component is iron arsenate; the co...

Embodiment 2

[0058] A sewage treatment method of the present invention, treating 1L of acid sewage from a certain colored smelting industry, wherein 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 45.968mg / L, nickel ion concentration 127.89mg / L, zinc ion concentration 73.493mg / L. The processing method includes the following steps, the process is as follows: figure 1 Shown:

[0059] (1) Oxidation-neutralization reaction: add hydrogen peroxide (industrial grade 30wt% content) 1.8g, ferrous sulfate (specifically ferrous sulfate heptahydrate, industrial grade 56wt% content) 12.5 g in the acid sewage after homogenization treatment After g, add Mg(OH) 2 1.1g, adjust the pH of the sewage to 3.6, react for 2 hours, filter and separate, and obtain 2.1g of filter residue, the main component is iron arsenate; the concentration o...

Embodiment 3

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

[0067] Such as figure 2 As shown, the sewage treatment system includes an oxidation 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, and the air flotation device 4 is provided with a The first outlet of the air flotation device 4 communicates with the oxidation neutralization reaction tank 1 after discharging the first outlet of the alkaline neutralizing agent obtained by air flotation separation.

[0068] In this embodiment, the air flotation device 4 is provided with a gas-liquid mixing tube 10, 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 to mix the reac...

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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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