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High-efficiency method for treating arsenic-containing wastewater

A waste water and oxidation treatment technology, applied in biological water/sewage treatment, neutralized water/sewage treatment, water/sewage multi-stage treatment, etc., can solve the problems of low arsenic removal efficiency, secondary pollution, and low arsenic removal efficiency , to achieve the effect of improving the efficiency of arsenic removal

Inactive Publication Date: 2011-06-29
湖南布鲁斯凯碳资产管理有限公司
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Problems solved by technology

These methods have the following defects: the efficiency of arsenic removal is low, if the wastewater contains a large amount of arsenic or As3+, the arsenic removal efficiency is not high; the use of strong oxidants such as sodium hypochlorite in the arsenic removal process is likely to cause secondary pollution; When the sludge is finished, the formed arsenic-containing sludge is dehydrated and dried with iron salt and then simply discharged, and the arsenic is easily leached by rainwater or groundwater to form secondary pollution

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  • High-efficiency method for treating arsenic-containing wastewater

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Embodiment Construction

[0014] figure 1 It is a brief explanatory diagram of an embodiment of the method for treating arsenic-containing wastewater according to the present invention.

[0015] figure 1 Among them, 9 is the first reaction tank, waste water 1 is added, and at the same time, bacterial oxidant 2′ composed of ferrooxidans is added to pre-oxidize As3+, and then slaked lime 2 is added to adjust the pH value; 10 is the first aggregation sedimentation tank, in the reaction The aggregates formed in the tank are precipitated and separated here; 11 is the second reaction tank, the supernatant discharged from the first aggregation sedimentation tank 10 is added, and flocculant is added to adjust the pH value; 12 is the second aggregation sedimentation tank , the aggregate that generates in the second reaction tank 11 is precipitated and separated here; 13 is a sludge storage tank, and the arsenic-containing sludge (a The first-level aggregate sedimentation sludge 6 and the second-level aggregat...

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Abstract

The invention discloses a high-efficiency method for treating arsenic-containing wastewater, solves the problems in the prior art, and provides a complete method for treating the arsenic-containing wastewater. Arsenic (As3 plus) can be catalytically oxidized in advance through self-oxidation iron oxide flow bacilli; arsenious acid ions are oxidized to arsenic acid ions; then calcium compounds are added to gather arsenic-containing waste in the water; solid-liquid separation is conducted twice; and sludge can enter the wastewater again to circularly remove arsenic. After treatment, the arsenic content in the wastewater is very low, the discharged arsenic-containing sludge becomes non-toxic matters to be land-filled after being dried and roasted, and the water needing to be discharged can be discharged directly.

Description

technical field [0001] The invention relates to a method capable of efficiently treating arsenic-containing wastewater to make it harmless, and belongs to the technical field of environmental protection engineering. Background technique [0002] Conventional treatment methods for making arsenic-containing wastewater harmless by removing arsenic include: adsorption, ion exchange, sulfide precipitation, co-precipitation of hydroxides, etc. A typical treatment idea is to use the co-precipitation method of hydroxides such as calcium oxides, iron salts, and magnesium compounds. These methods have the following defects: the efficiency of arsenic removal is low, if the wastewater contains a large amount of arsenic or As3+, the arsenic removal efficiency is not high; the use of strong oxidants such as sodium hypochlorite in the arsenic removal process is likely to cause secondary pollution; After the sludge is finished, the formed arsenic-containing sludge is dehydrated and dried w...

Claims

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Application Information

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IPC IPC(8): C02F9/14C02F3/34C02F1/66C02F1/52C02F11/06C02F101/20
Inventor 孔祥勇刘晓文刘修建刘卓锫
Owner 湖南布鲁斯凯碳资产管理有限公司
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