Treatment method and system of wastewater

A treatment method and wastewater technology, applied in water/sewage treatment, biological water/sewage treatment, reduced water/sewage treatment, etc., can solve the problems of reducing biological toxicity of wastewater, high cyanide ion and thiocyanate ion concentration, and achieve The effect of stabilizing the water quality of wastewater, stabilizing water quality, and ensuring the effect

Inactive Publication Date: 2016-08-10
武汉钢铁有限公司
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0004] The embodiment of the present invention solves the technical problem of high concentration of cyanide ions and thiocyanate ions in the waste water in the prior art by providing a waste water treatment method and system, realizes stable water quality of waste water, and reduces the impact of waste water on biological The technical effect of reducing the biological toxicity of wastewater by treating the impact of water quality

Method used

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  • Treatment method and system of wastewater
  • Treatment method and system of wastewater

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Embodiment 1

[0049] The process of treating distilled ammonia wastewater through the system provided by the embodiment of the present invention (wherein, the reagent with oxidizing and precipitation functions is Ca(ClO) 2 , The reagent with reducing and precipitation function is FeSO 4 )include:

[0050] 1. The wastewater after ammonia distillation is cooled to below 35°C by two heat exchangers. The two media of the heat exchanger are circulating water and ammonia wastewater.

[0051] 2. Filter the waste water treated in process 1 through a paper bag filter, and the filter aperture of the paper bag is selected to be 0.1-0.5mm.

[0052] 3. Put 0.1mm diameter Ca(ClO) into the wastewater treated by process 2 in the mixing and mixing tank according to the solid-liquid ratio of 1:200-1:300 2 , The stirring speed of the stirrer is 20-80r / min, and the stirring time is 20-30min.

[0053] 4. In the same mixing tank, the FeSO put in the wastewater after treatment in process 3 according to the liquid-to-liqui...

Embodiment 2

[0058] The process of treating distilled ammonia wastewater through the system provided by the embodiment of the present invention (wherein, the reagent with oxidizing and precipitation functions is Mg 2 ClO(OH) 3 ﹒ H 2 O, the reagent with reducing and precipitation function is FeCl 2 )include:

[0059] 1. The wastewater after ammonia distillation is cooled to below 35°C by two heat exchangers. The two media of the heat exchanger are circulating water and ammonia wastewater.

[0060] 2. Filter the waste water treated in process 1 through a paper bag filter, and the filter aperture of the paper bag is selected to be 0.1-0.5mm.

[0061] 3. Put Mg with a particle size of 0.1mm into the wastewater treated in process 2 according to the solid-liquid ratio of 1:250-1:350 in the mixing tank 2 ClO(OH) 3 ﹒ H 2 O, the stirring speed of the stirrer is 30-65r / min, and the stirring time is 20-30min.

[0062] 4. In the same mixing tank, the FeCl added to the wastewater after treatment in process 3 ...

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Abstract

The invention discloses a treatment method and system of wastewater, wherein the method comprises the following steps: cooling wastewater; adding reagents with oxidation and precipitation functions to cooled wastewater, and stirring for the first time; adding reagents with reduction and precipitation functions to wastewater which is stirred for the first time, and stirring for the second time; precipitating wastewater which is stirred by two times to separate liquid and precipitates; carrying out biochemical desulfurization and decyanation on the liquid obtained by being precipitated; performing high temperature treatment for the precipitates obtained by being precipitated to complete harmless treatment, so that the concentrations of cyanide ions and thiocyanate ions in wastewater are lowered to realize the technical effects of stabilizing the water quality of wastewater and lowering the water quality impact of wastewater for biological treatment to weaken the biological toxicity of wastewater.

Description

Technical field [0001] The present invention relates to the technical field of wastewater treatment, in particular to a wastewater treatment method and system. Background technique [0002] In the field of coking, multiple processes in chemical production will produce wastewater containing cyanide ions and thiocyanate ions. Since these wastewaters are often sent directly to biological sewage treatment plants for wastewater treatment, they will have a serious impact on the water quality of their treatment processes, which will affect the quality of their effluents. It is generally believed that the concentration of cyanide ions in the influent water of a biological treatment process with activated sludge as the main body should not be greater than 10 mg / L. When the concentration of cyanide ion in wastewater exceeds this concentration for a long time, it will affect the activity of sludge. When the concentration of cyanide ions in the wastewater is higher than 20mg / L for a long t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14
CPCC02F9/00C02F1/001C02F1/5236C02F1/70C02F1/72C02F3/00
Inventor 付本全薛改凤张垒王丽娜刘璞汪雪峰刘霞
Owner 武汉钢铁有限公司
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