Treatment method of arsenic wastewater

A treatment method and technology for wastewater, applied in water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc. It can achieve the effects of high chemical utilization rate and reaction efficiency, small chemical dosage, and short construction period.

Active Publication Date: 2014-07-23
CHANGSHA HASKY ENVIRONMENTAL PROTECTION TECH DEV CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Conventional treatment methods need to add a large amount of metal salts, lime or calcium carbide slag, which leads to a large amount of waste residue in the wastewater treatment stage, and cannot effectively separate and recycle the arsenic and various heavy metal precipitates contained in the waste residue. The amount of sludge produced in the end is also very large and the composition is complex. These sludges are also difficult to recycle and utilize. If they are treated as hazardous waste, they will bring huge economic burdens to enterprises and easily cause secondary pollution.

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  • Treatment method of arsenic wastewater
  • Treatment method of arsenic wastewater
  • Treatment method of arsenic wastewater

Examples

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Embodiment 1

[0037] A kind of wastewater containing high concentration of arsenic and heavy metals to be treated, wherein the content of arsenic is 10000mg / L, the content of cadmium is 100mg / L, the content of copper is 50mg / L, the content of lead is 80mg / L, the pH of the wastewater is 8, and the present invention is adopted as Figure 4 The treatment method shown is to treat the arsenic-containing wastewater by adopting a continuous water inflow method, and the treatment volume is controlled at 500L / h, which specifically includes the following steps:

[0038] (a) pH adjustment: transport the waste water to be treated to the first adjustment tank, add concentrated sulfuric acid to the waste water to be treated, and adjust its pH value to below 5;

[0039] (b) Sulfurization and arsenic removal: Pass the pH-adjusted wastewater into a tubular arsenic removal continuous treatment device (referred to as the tubular arsenic removal device), and control the pH value of the reaction environment in ...

Embodiment 2

[0062] A kind of wastewater containing high concentration of arsenic and heavy metals to be treated, wherein the content of arsenic is 5000mg / L, the content of cadmium is 80mg / L, the content of copper is 30mg / L, the content of lead is 50mg / L, the pH of wastewater=6, adopt the present invention The treatment method for this arsenic-containing wastewater is treated by continuous water inflow, and the treatment volume is controlled at 1000L / h, which specifically includes the following steps:

[0063] (a) pH adjustment: step (a) of this example is the same as Example 1;

[0064] (b) Sulfurization and arsenic removal: Step (b) of this example is the same as that of Example 1;

[0065] (c) Solid-liquid separation: Step (c) of this example is the same as Example 1; the arsenic content in the effluent after centrifugation is 0.3 mg / L, the cadmium content is 0.8 mg / L, and the copper content is 0.4 mg / L. The lead content is 1.2 mg / L (see Table 2 below); it can be seen that the removal ...

Embodiment 3

[0072] A kind of wastewater containing high concentration of arsenic and heavy metals to be treated, wherein the content of arsenic is 1000mg / L, the content of cadmium is 10mg / L, the content of copper is 8mg / L, the content of lead is 20mg / L, the pH of wastewater=5, adopt the present invention The treatment method for this arsenic-containing wastewater is treated by continuous water inflow, and the treatment volume is controlled at 2000L / h, which specifically includes the following steps:

[0073] (a) pH adjustment: step (a) of this example is the same as Example 1;

[0074] (b) Sulfurization and arsenic removal: Step (b) of this example is the same as that of Example 1;

[0075] (c) Solid-liquid separation: Step (c) of this example is the same as Example 1; the arsenic content in the effluent after centrifugation is 0.4 mg / L, the cadmium content is 0.2 mg / L, and the copper content is 0.3 mg / L. The lead content is 0.5mg / L (see Table 3 below); it can be seen that the removal ra...

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Abstract

The invention discloses a method for treating arsenic-containing wastewater, which comprises the following steps: selectively adding acid solution to the arsenic-containing wastewater to adjust its pH value from 0 to 5; then passing the arsenic-containing wastewater into a reaction device, Continuous treatment and removal of arsenic by adding sulfide in multiple stages; solid-liquid separation of the effluent after reaction, and recycling of the separated arsenic slag; addition of alkali to the separated effluent, electrochemical advanced treatment of the effluent, electrochemical advanced treatment includes electrolysis Coagulation, electrolytic air flotation and electrolytic redox steps; in electrolytic coagulation, cations are generated by electrolysis of soluble anode iron plates for flocculation; the subsequent effluent is aerated and oxidized to generate flocs containing ferric ions in the effluent, The micelle-like precipitate is then separated from the solid and liquid, and the separated supernatant can be recycled or discharged up to the standard. The invention has the advantages of short process, small investment, low cost, high resource recycling rate, environmental protection, continuous processing and the like.

Description

technical field [0001] The invention relates to a method for treating wastewater, in particular to a method for treating arsenic-containing wastewater. Background technique [0002] With the development of the metallurgical and chemical industries, a large amount of arsenic elements have entered into industrial wastewater, and arsenic-containing wastewater often contains other heavy metal elements, such as Cu, Pb, Cd, etc. The acidity of this type of wastewater is high, generally at 5 % to 10%, and the concentration of arsenic can be as high as tens of thousands of milligrams. The treatment of this kind of polluted acid wastewater containing high concentration of arsenic and heavy metals is a major problem faced by the smelting industry at present. [0003] The existing treatment methods of arsenic-containing wastewater mainly include lime method, lime-iron salt method, chemical method and so on. Conventional treatment methods need to add a large amount of metal salts, lim...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/06
Inventor 蒋晓云何劲松任树谭勇毛世超
Owner CHANGSHA HASKY ENVIRONMENTAL PROTECTION TECH DEV CO LTD
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