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A method for treating multi-valence arsenic-containing sludge

A sludge treatment and multivalent state technology, which is applied in sludge treatment, fixed/solidified sludge treatment, water/sludge/sewage treatment, etc., can solve the problem of high cost of chemical treatment, lack of safety guarantee, Reaction end point is not easy to control and other problems, to achieve good strength, good inertness, and reduce toxicity

Inactive Publication Date: 2017-10-24
云南大地绿坤环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the cost of chemical treatment is high, and the reaction end point is not easy to control; the stability of physical treatment of arsenic ions is not high, and the safety cannot be guaranteed; the method of biological treatment is still in the research stage, and there is no suitable biological method to deal with arsenic. hazardous solid waste

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] At room temperature, weigh 100g of polyvalent arsenic-containing sludge, add 30mL of water, and mix for 10min; add 1.5ml of waste dilute hydrochloric acid, and stir until the pH value is 5; add 8g of potassium persulfate, and oxidize for 20min; SiO 2 , 3g MgO and 6g KAl (SO 4 ) 12H 2 O was added to the reacted sludge and reacted for 30 minutes; then 5g of lime was added to adjust the pH to about 8.5, and finally 20g of cement and 4g of acid and alkali resistant clay were added to the sludge in turn, mixed and stirred for 15 minutes for curing.

[0023] Performance test: According to the solid waste toxic leaching method-horizontal oscillation method (GB 5086.2-1997), the arsenic leaching concentration meets the pollution control standard of hazardous waste landfill (GB 18598-2001).

Embodiment 2

[0025] At room temperature, weigh 100g of polyvalent arsenic-containing sludge, add 25mL of water, and mix for 10min; add 2ml of waste dilute hydrochloric acid, and stir until the pH value is 6; add 12g of potassium persulfate and oxidize for 25min; take 8g of SiO 2 , 4g MgO and 4g KAl (SO 4 ) 12H 2 O was added to the reacted sludge and reacted for 25 minutes; then 7g of lime was added to adjust the pH to about 7.5, and finally 15g of cement and 4g of acid and alkali resistant clay were added to the sludge in turn and mixed for 20 minutes for curing.

[0026] Performance test: According to the solid waste toxic leaching method-horizontal oscillation method (GB 5086.2-1997), the arsenic leaching concentration meets the pollution control standard of hazardous waste landfill (GB 18598-2001).

Embodiment 3

[0028] At room temperature, weigh 250g of polyvalent arsenic-containing sludge, add 55mL of water, and mix for 15min; add 3ml of waste dilute hydrochloric acid, and stir until the pH value is 4.5; add 18g of potassium persulfate and oxidize for 30min; take 10g of SiO 2 , 6g MgO and 8g into 6gKAl (SO 4 ) 12H 2 O was added to the reacted sludge and reacted for 25 minutes; then 9g of lime was added to adjust the pH to about 8, and finally 40g of cement and 5g of acid and alkali resistant clay were added to the sludge in turn and mixed for 20 minutes for curing.

[0029] Performance test: According to the solid waste toxic leaching method-horizontal oscillation method (GB 5086.2-1997), the arsenic leaching concentration meets the pollution control standard of hazardous waste landfill (GB 18598-2001).

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PUM

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Abstract

A method for treating multi-valence arsenic-containing sludge is disclosed. The method includes steps of adding the arsenic-containing sludge into a proper amount of water at room temperature, stirring the mixture, adjusting the pH value of the arsenic-containing sludge to obtain a mixture I, adding a certain amount of an oxidant into the arsenic-containing sludge to obtain a mixture II, then adding a stabilizer into the mixture to obtain a mixture III, stirring the mixture for a certain time period, then adjusting the pH of a solidified body to alkalinity to obtain a mixture IV, and finally adding a curing agent. The method has advantages of capability of oxidizing low-valence arsenic into stable low-toxicity arsenic, the stable and high-strength solidified body, a simple process, and high operationality.

Description

technical field [0001] The invention belongs to the technical field of safe treatment of solid hazardous waste, and in particular relates to a method for treating multivalent arsenic-containing sludge. Background technique [0002] Arsenic-containing compounds are a series of highly toxic compounds. The lethal dose of common arsenic trioxide (commonly known as arsenic) is about 0.2g. Arsenic is a carcinogenic and teratogenic element that can be absorbed by the human body through the respiratory tract, skin and digestive tract, causing various diseases , a serious threat to the living environment of human beings. [0003] In nature, arsenic exists in many different valence states, the common ones are As 2+ 、As 3+ and As 5+ , can form inorganic arsenic compounds and organic arsenic compounds with other simple ions or complexing groups. Most inorganic arsenic compounds are more toxic than organic arsenic compounds. In the formed compounds, the toxicity of the compounds var...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/00C02F11/06
CPCC02F11/008C02F11/06
Inventor 周建邱金成尹砾珩杨兆标李本贤
Owner 云南大地绿坤环保科技有限公司
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