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Chromium and nickel wastewater treatment method

A sewage treatment method and sewage technology, which are applied in water/sewage treatment, neutralized water/sewage treatment, water/sewage multi-stage treatment, etc. Simple process, simple process facilities, and good treatment quality

Inactive Publication Date: 2015-04-29
KESHENG ENVIRONMENTAL PROTECTION TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method can use cheap alkaline neutralizer as the treatment agent and has the advantage of low operating cost, but in the process of treatment, it needs to adjust the pH value three times, and precipitate and separate the flocculent hydroxide twice. Its treatment facilities are many , Occupy a large area, the process is complicated, and the process is too long

Method used

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Embodiment Construction

[0016] at 200m 3 Inject 100m into the pool 3 Chromium and nickel sewage (containing chromium 254mg / L, nickel 30mg / L), add lime milk under stirring, adjust the pH value of the treated water to 9.1, add sodium sulfide aqueous solution (1 kg of industrial grade sodium sulfide dissolved in 20 liters of water ) 143 liters. After the flocculent hydroxides and sulfides in the sewage are precipitated, the supernatant can reach the emission standards that the total amount of metallic nickel is less than 0.12mg / L and the total amount of metallic chromium is less than 2mg / L.

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Abstract

The invention discloses a chromium and nickel wastewater treatment method. According to the method, firstly, an alkaline neutralizer is added to wastewater, the pH value of wastewater is adjusted to 8.6-8.8, most of chromium forms chromic hydroxide, part of nickel forms nickel hydroxide precipitates, then, a vulcanizing agent is added to a solution, the rest chromium and nickel form nickel sulfide and chromium sulfide precipitates, and settled chromic hydroxide, nickel hydroxide nickel sulfide and chromium sulfide are separated and removed. Compared with treatment with a conventional sulfurized method, the method has the advantages as follows: the amount of hydrogen sulfide produced in the treatment process is greatly reduced, and the treatment agent cost can be reduced by 47%; compared with a neutralization method, the land occupation of a treatment facility and the construction investment of the treatment facility are reduced by more than 55%.

Description

technical field [0001] The invention relates to a treatment method for polluted water, in particular to a treatment method for precipitating and separating chromium and nickel in sewage containing chromium and nickel in the form of compounds to reduce the concentration of chromium and nickel in the water to a slightly harmful or even harmless level. Background technique [0002] In some industrial production, especially electroplating production process, a large amount of waste water polluted by chromium and nickel will be produced. At present, the methods for treating this kind of sewage include sulfuration method and neutralization method. [0003] The vulcanization method is used to treat sewage containing chromium and nickel by adding a vulcanizing agent, so that the chromium and nickel in the solution are precipitated and separated in the form of chromium sulfide and nickel sulfide respectively, thereby reducing the concentration of chromium and nickel in the water....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F101/20C02F101/22
CPCC02F9/00C02F1/62C02F1/66C02F2101/20C02F2101/22C02F2301/08
Inventor 曹惠忠李卓坪
Owner KESHENG ENVIRONMENTAL PROTECTION TECH CO LTD
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