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Chemical chromium waste liquid efficient resourceful treatment process

A treatment process and recycling technology, applied in the field of high-efficiency recycling of chemical chromium waste liquid, can solve the problems of poor treatment effect, doping, incomplete reduction reaction, etc. Effect

Pending Publication Date: 2021-11-16
苏州翔展环保工程有限公司
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Problems solved by technology

[0002] In most chemical waste liquids, chromium appears in two forms of hexavalent chromium and trivalent chromium in the waste liquid, and hexavalent chromium mainly exists in the form of chromate. In order to reduce the harm, we need to The reduction and precipitation method is a widely used method for the treatment of chromium-containing wastewater, but the main steps of the current reduction and precipitation method are for reduction and precipitation, while ignoring the treatment of waste before reduction and after precipitation. The treatment of the solution leads to incomplete reduction reaction, or the solution after precipitation is still doped with chromium, resulting in poor overall treatment effect

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  • Chemical chromium waste liquid efficient resourceful treatment process

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Embodiment 1

[0029] Embodiment 1, refer to figure 1 , a high-efficiency resource treatment process for chemical chromium waste liquid, comprising the following steps:

[0030] S1: Pretreatment, collect the chemical chromium waste liquid, pass the collected chemical chromium waste liquid into the filter for filtration, use the filtration to remove the solid impurities in the waste liquid, and then remove the solid impurities chromium waste The liquid is passed into the reaction tank to form the initial waste liquid. In the process of pretreatment and filtration, the fine solid particles doped in the chemical waste liquid can be removed, and the impact on the subsequent reduction and precipitation processes can be reduced to the greatest extent. , to ensure that the reaction is completely carried out;

[0031] S2: Reduction, adjust the pH value of the initial waste liquid, the pH value of the adjusted initial waste liquid is 2.5, then add sodium sulfite solution to the initial waste liquid ...

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Abstract

The invention relates to the technical field of chromium waste liquid treatment, in particular to a chemical chromium waste liquid efficient resourceful treatment process which comprises the following steps: S1, pretreatment: collecting and filtering chemical chromium waste liquid to form initial waste liquid; S2, performing reduction; S3, precipitating; S4, performing flocculation; and S5, filtering and collecting: standing and precipitating the flocculation solution obtained in S4, and filtering to realize separation, collection and recovery. According to the method, on the basis of an original chromium waste liquid reduction precipitation method, a filtering step is added before reduction and after precipitation, small solid impurities mixed in chemical waste liquid can be removed through filtering before reduction, the follow-up reduction reaction process is prevented from being influenced, filtering is adopted after precipitation, so that chromium-containing chemicals mixed in the solution can be removed, the treatment effect of the whole chromium-containing waste liquid is improved, the precipitation rate is greatly improved, and the efficient and rapid treatment of the chromium-containing chemical waste liquid can be realized.

Description

technical field [0001] The invention relates to the technical field of chromium waste liquid treatment, in particular to a high-efficiency resource treatment process for chemical chromium waste liquid. Background technique [0002] In most chemical waste liquids, chromium appears in two forms of hexavalent chromium and trivalent chromium in the waste liquid, and hexavalent chromium mainly exists in the form of chromate. In order to reduce the harm, we need to The reduction and precipitation method is a widely used method for the treatment of chromium-containing wastewater, but the main steps of the current reduction and precipitation method are for reduction and precipitation, while ignoring the treatment of waste before reduction and after precipitation. The treatment of the solution leads to incomplete reduction reaction, or the solution after precipitation is still doped with chromium, resulting in poor overall treatment effect. Contents of the invention [0003] The p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F9/10C02F101/22
CPCC02F9/00C02F2101/22C02F1/001C02F1/66C02F2209/06C02F1/70C02F1/5281C02F2001/007C02F1/5236C02F2209/02C02F1/02
Inventor 陆健健
Owner 苏州翔展环保工程有限公司
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