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Treatment method of arsenic wastewater

A treatment method and wastewater technology, applied in water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., can solve the problem that heavy metal sediments cannot be effectively separated and recovered, sludge is difficult to recover and Utilization, large amount of sludge and other problems, to achieve the effect of high chemical utilization rate and reaction efficiency, small chemical dosage, and short construction period

Active Publication Date: 2013-05-22
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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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 treatment method of arsenic wastewater. The treatment method comprises the following steps: optionally adding acid liquor into the arsenic wastewater to adjust the pH value to 0-5; introducing the arsenic wastewater into a reaction unit, continuously removing arsenic by adding sulfide in multistage manner; carrying out solid-liquid separation on the effluent after reaction, recycling the separated arsenic slag; adding alkali into the separated effluent to perform electrochemical advanced treatment, wherein the electrochemical advanced treatment includes an electrolytic coagulation step, an electrolytic flotation step and an electrolytic oxidation reduction step, in the electrolytic coagulation, cations are generated by the electrolyzation of a soluble anodic iron plate for flocculation; carrying out aerated oxidation on the effluent after flocculation to generate floc and micelle sediment including ferric ions, and then carrying out solid-liquid separation, wherein the liquid supernatant after separation can be recycled or reach the standard and drain outwards. The treatment method of arsenic wastewater has the advantages of simple technology, low investment, low cost and high resource recovery and recycling rate, and being green and environment-friendly, and being capable of treating continuously 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 Applications(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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