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Method for strengthening sulfidizing treatment of arsenic-containing wastewater by utilizing sulfur dioxide

A technology for sulfur dioxide and sulfurization treatment, which is applied in water/sewage treatment, chemical instruments and methods, water/sludge/sewage treatment, etc. It can solve the problems of low arsenic removal efficiency, high cost, secondary pollution, etc. Arsenic efficiency, enhanced stability, good effect of waste treatment

Pending Publication Date: 2021-09-28
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method has low arsenic removal efficiency and high cost, and it is easy to cause secondary pollution and other problems during system operation.

Method used

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  • Method for strengthening sulfidizing treatment of arsenic-containing wastewater by utilizing sulfur dioxide

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Effect test

Embodiment 1

[0032] In this embodiment, a set of sulfidation and arsenic removal devices equipped with gaseous hydrogen sulfide as a sulfidation agent from an actual copper smelter includes a volume of 30m 3 A sealed cylindrical autoclave and a volume of 30m 3 A sealed cylindrical exhaust gas treatment tank. Among them, the pH of the wastewater treated by the vulcanization tank is 7, the concentration of arsenic is 10000mg / L, and the treatment volume is 20m 3 For waste water, the concentration of hydrogen sulfide gas used is 50%, and the flow rate is 500m 3 / h, the treatment time is 1 hour, and the arsenic removal efficiency is about 40%. Switch to SO2-enhanced method, first, use 5% SO2 gas at 120m 3 The flow rate of / h is aerated for 20min. At this time, the pH of the wastewater drops to about 2.7, and then 50% hydrogen sulfide gas is used to 3 / h flow aeration for 1 hour, at this time, the arsenic removal efficiency reaches 95%, stop feeding hydrogen sulfide gas, and reuse 5% sulfur ...

Embodiment 2

[0034] A lead smelter is equipped with a sulfidation arsenic removal device using sodium sulfide as the sulfidation agent, which includes a 50m 3 A sealed cylindrical autoclave and a volume of 30m 3 A sealed cylindrical exhaust gas treatment tank. Among them, the vulcanization tank is equipped with a stirring device, the pH of the treated wastewater is 4, the concentration of arsenic is 3000mg / L, and the treatment volume is 30m 3 For waste water, the sodium sulfide liquid concentration used is 20%, adding 3m each time 3 , the treatment time is 1 hour, and the arsenic removal efficiency is about 50%. Switch to SO2-enhanced method, first, use 5% SO2 gas at 120m 3 The flow rate of / h is aerated for 20 minutes. At this time, the pH of the wastewater drops to about 2.3. After injecting sodium sulfide solution for 1 hour, re-use 5% sulfur dioxide gas at 120m 3 The flow rate of / h is aerated for 2 hours. At this time, the pH of the wastewater is about 2, and the arsenic removal e...

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Abstract

The invention relates to a method for strengthening sulfidizing treatment of arsenic-containing wastewater by utilizing sulfur dioxide. The method comprises the following steps of: 1, introducing sulfur dioxide gas with a proper concentration into the arsenic-containing wastewater with a pH value of more than 3, and rapidly reducing the pH value of the wastewater; 2, when the pH value of the wastewater is lower than 3, stopping aeration with the sulfur dioxide gas, and then adding a sulfidizing agent to enable sulfide precipitates to gradually aggregate and grow; 3, introducing sulfur dioxide gas into the sulfurized wastewater in a stirring state again; and 4, filtering the treated wastewater to obtain arsenic sulfide slag, recycling the arsenic sulfide slag, and subjecting low-concentration arsenic waste liquid formed by a supernatant to deep removal of arsenic. Compared with the prior art, the arsenic removal efficiency of the wastewater can be remarkably improved, and meanwhile, the problems of acid consumption and additional waste salt generation caused by pH value adjustment of the wastewater can be solved; and the method has the good effects of recycling resources and treating the waste with the waste.

Description

technical field [0001] The invention belongs to the field of environmental protection. In particular, it relates to a method for using sulfur dioxide to strengthen the sulfidation treatment of arsenic-containing wastewater. Background technique [0002] With the rapid development of China's economy, the impact of human activities on the environment has gradually increased people's awareness of environmental protection. Among them, the arsenic (As)-containing wastewater produced in industrial production is extremely harmful to the environment. At present, the sulfuration method has become the main method for removing arsenic in high-acid wastewater with fast speed and high efficiency. However, for As-containing wastewater with a high pH value (>3), the sulfidation method has the problems of low As removal efficiency, slow sedimentation of arsenic trisulfide and poor filterability of the precipitate, and increasing the S / As ratio cannot improve As On the contrary, the re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/52C02F101/10
CPCC02F1/5236C02F2101/103
Inventor 晏乃强纪蕾朋瞿赞黄文君徐浩淼丁羽辰
Owner SHANGHAI JIAO TONG UNIV
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