A kind of cyanide-containing high-concentration ammonium sulfite wastewater treatment method

A technology for ammonium sulfite and wastewater treatment, applied in water/sewage treatment, multi-stage water/sewage treatment, degassed water/sewage treatment, etc., can solve the problem of increased alkali consumption, liquid alkali waste, and increased wastewater discharge Quantity and other issues, to achieve the effect of low product cost, sufficient ammonia recovery, and reduced input

Active Publication Date: 2022-05-03
ZHONGYE-CHANGTIAN INT ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Cyanide can form a buffer pair with ammonia. When the wastewater is adjusted to be alkaline to recover ammonia, the alkali consumption will increase sharply, resulting in waste of liquid caustic soda and increased wastewater discharge.

Method used

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  • A kind of cyanide-containing high-concentration ammonium sulfite wastewater treatment method
  • A kind of cyanide-containing high-concentration ammonium sulfite wastewater treatment method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0087] A kind of cyanide-containing high-concentration ammonium sulfite wastewater treatment method comprises the following steps:

[0088] 1) remove sulfite ion: add sulfite precipitant to waste water, generate sulfite precipitate, separate after reaction is completed, obtain filtrate;

[0089] 2) removing cyanide ions: adding an oxidant to the filtrate, the cyanide ions react with the oxidant to obtain a solution for removing cyanide ions;

[0090] 3) Ammonia gas recovery: add lye to the solution from which cyanide ions have been removed, adjust the solution to alkaline, and recover ammonia gas through the ammonia gas recovery system.

Embodiment 2

[0092] A method for treating cyanogen-containing high-concentration ammonium sulfite wastewater, the method comprising the following steps:

[0093] 1) Remove sulfite ions: add calcium oxide to the wastewater to generate calcium sulfite precipitate, stir for 12 hours, and separate by filtration after the reaction is completed to obtain the filtrate;

[0094] 2) Removing cyanide ions: adding hydrogen peroxide to the filtrate, the cyanide ions react with hydrogen peroxide, the reaction time is 0.5h, and the reaction temperature is 40°C; a solution for removing cyanide ions is obtained;

[0095] 3) Recover ammonia: add sodium hydroxide to the solution from which cyanide ions are removed, adjust the solution to be alkaline, and the pH value is 9-12; recover ammonia through the ammonia recovery system;

[0096] Wherein: the concentration of sulfurous acid in the high-concentration ammonium sulfite wastewater containing cyanide is 0.08mol / L; Step 1) the ratio of the molar weight of ...

Embodiment 3

[0098] Repeat embodiment 2, just the concentration of sulfurous acid in the high-concentration ammonium sulfite wastewater containing cyanide is 0.15mol / L, replace calcium oxide with ferrous sulfate in step 1), adopt suction filtration to separate; Step 1) add ferrous sulfate The ratio of the molar amount of sulfite ion to the molar amount of sulfite ion in wastewater is 1:1.

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Abstract

A method for treating cyanide-containing high-concentration ammonium sulfite wastewater, comprising the following steps: 1) removing sulfite ions: adding a sulfite precipitant to the wastewater to generate sulfite precipitates, and separating after the reaction is completed to obtain a filtrate; 2) remove cyanide ion: add oxidizing agent in filtrate, cyanide ion reacts with oxidizing agent, obtain the solution that removes cyanide ion; 3) recover ammonia: add lye to the solution that removes cyanide ion, adjust solution to alkali Ammonia gas is recovered through the ammonia gas recovery system. A method for treating cyanide-containing high-concentration ammonium sulfite wastewater provided by the scheme of the present invention: first remove sulfite ions and cyanide ions in high-concentration ammonium sulfite successively, and then add lye to adjust the pH value of the solution. This reduces the amount of lye used to recover the ammonia, thereby reducing the cost of recovering the ammonia.

Description

technical field [0001] The invention relates to a wastewater treatment method, in particular to a method for treating cyanide-containing high-concentration ammonium sulfite wastewater, which belongs to the field of sewage treatment. Background technique [0002] Ammonia desulfurization will produce a large amount of ammonium sulfite wastewater. Ammonium sulfite wastewater belongs to ammonia nitrogen wastewater. Direct discharge of ammonium sulfite wastewater will cause serious environmental pollution, causing toxic organisms in the water to multiply in a short period of time, resulting in red tides and algal blooms Eutrophication and other eutrophication phenomena, while consuming dissolved oxygen in water, seriously threaten the life safety of fish and shrimp and the health of humans and animals. [0003] At present, the treatment / disposal method for ammonium sulfite mainly adopts evaporative crystallization to reclaim ammonium sulfite solid or evaporative crystallization t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04C02F101/18C02F101/16C02F101/10
CPCC02F9/00C02F1/001C02F1/72C02F1/66C02F2001/007C02F1/24C02F1/722C02F1/76C02F1/78C02F1/20C02F2101/18C02F2101/16C02F2101/101
Inventor 杨本涛李佳崔泽星魏进超肖祈春
Owner ZHONGYE-CHANGTIAN INT ENG CO LTD
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