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Treatment method and system for waste lye

A treatment method and a treatment system technology, which are applied in the field of waste lye treatment methods and treatment systems, can solve problems such as waste of resources, and achieve the effects of not being easy to foul and block, effective recycling, and simple operation

Pending Publication Date: 2019-03-08
SUZHOU QINGRAN ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In order to at least solve the technical problem of waste of resources caused by not recovering hydroxide resources during the treatment of existing waste lye, the purpose of the present invention is to provide a treatment method and system for waste lye, so as to be able to effectively recycle waste lye Hydroxide resources

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  • Treatment method and system for waste lye
  • Treatment method and system for waste lye
  • Treatment method and system for waste lye

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Effect test

Embodiment 1

[0056] In this embodiment, the waste caustic lye adopts the tertiary desulfurization liquid wastewater of ethylene alkali slag, and the total chemical oxygen demand (full name Chemical Oxygen Demand, COD for short) of the spent caustic liquor before treatment is 190000-200000mg / l, wherein organic COD is in 10000-20000mg / L, salt content 40%-50%, adopt described processing method provided by the present invention to process this waste lye, process and effect are as follows:

[0057] In the first step, the waste lye is introduced into a fixed bed of activated carbon, and the water is discharged after being adsorbed by activated carbon; after testing, the COD in the effluent is 170,000-180,000 mg / l, which is an inorganic salt COD, and the organic matter is almost completely removed;

[0058] The second step is to introduce the effluent from the first step and the alcoholic organic solvent into the salt separation unit under stirring, and treat for 1 to 24 hours to obtain a solid-li...

Embodiment 2

[0061] In this embodiment, waste caustic lye adopts ethylene alkali slag tertiary desulfurization liquid waste water, and the total COD of the waste caustic before treatment is 250,000-270,000 mg / l, wherein organic COD is 40,000-50,000 mg / L, and the salt content is 50%- 60%, adopt the described processing method provided by the invention to process this spent caustic soda, process and effect are as follows:

[0062] In the first step, the waste lye is introduced into a fixed bed of activated carbon, and the water is discharged after being adsorbed by activated carbon; after testing, the COD in the effluent is 200,000-220,000 mg / l, which is an inorganic salt COD, and the organic matter is almost completely removed;

[0063] The second step is to introduce the effluent from the first step and the alcoholic organic solvent into the salt separation unit under stirring, and treat for 1 to 24 hours to obtain a solid-liquid mixture; centrifuge the solid-liquid mixture at the solid-liq...

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Abstract

The invention discloses a treatment method and system for waste lye. The treatment method comprises the following steps: removal of organic matters: removing organic matters in the waste lye to obtainlow-organic waste lye; salting: mixing an organic solvent and the low-organic waste lye to separate out inorganic salt which is insoluble in the organic solvent from the low-organic waste lye in order to form a solid-liquid mixture; performing solid-liquid separation on the solid-liquid mixture to obtain solid-phase inorganic salt and waste lye containing the organic solvent; and recovery of theorganic solvent: separating the organic solvent from the waste lye containing the organic solvent to obtain a lye solution. Compared with the prior art, the treatment method and system for the waste lye disclosed by the invention has the advantages that a high-purity hydroxide lye solution can be obtained, and hydroxide resources in the waste lye are recycled effectively; moreover, the whole system is easy to operate; the energy consumption is low; and pollution and plugging are not prone to occur.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment, and relates to a treatment method and a treatment system for waste lye. Background technique [0002] The problem of water pollution is an environmental problem that spreads all over the world. In order to improve the quality of water environment, the water environmental protection measures taken by the country are increasing day by day. "Zero discharge" has become one of the most important issues in wastewater treatment. The so-called "zero discharge" is usually It can be understood as infinitely reducing pollutant and resource emissions until zero. [0003] Coal chemical industry, petrochemical industry and other industrial fields usually produce a large amount of waste lye. of hydroxide. [0004] For waste lye, effectively recovering a large amount of resources in waste lye, especially the recovery of hydroxide resources, is an important task to achieve "zero discharge". [000...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/02C02F101/30
CPCC02F9/00C02F1/26C02F1/281C02F1/38C02F2001/007C02F2101/30C02F2201/007C02F2301/08
Inventor 陈建军张柯王慧丽
Owner SUZHOU QINGRAN ENVIRONMENTAL PROTECTION TECH
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