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Zero emission process of advanced treatment of coal chemical biochemical tail water

A technology of advanced treatment and coal chemical industry, which is applied in multi-stage water treatment, water/sewage treatment, water/sewage multi-stage treatment, etc. It can solve the problems of reducing treatment cost and difficult treatment of resin desorption liquid, so as to reduce treatment cost. , the effect of reducing membrane fouling

Inactive Publication Date: 2017-05-31
SEDIN ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The present invention uses macroporous resin to adsorb and remove COD, uses ceramic membrane nanofiltration to treat the desorption liquid, and incinerates the concentrated resin desorption liquid, which solves the difficult problem of resin desorption liquid; using nanofiltration + reverse osmosis + Nanofiltration + Membrane Distillation + Evaporation and Crystallization is used to treat concentrated brine, which not only achieves zero discharge but also produces salt by-products, reducing treatment costs

Method used

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  • Zero emission process of advanced treatment of coal chemical biochemical tail water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] (1) Inclined plate settlement

[0045] The main water quality characteristics of biochemical tail water are: pH7.26, COD: 100mg / L, TDS: 1000mg / L, total hardness: 150mg / L, suspended solids 160mg / L, chromaticity 50 times, turbidity: 10NTU. Enter the inclined plate settling tank and add PAC coagulant and NaClO fungicide, the coagulant dosage is 20ppm, the fungicide is 2ppm, and the hydraulic retention time of the inclined plate settling tank is 2h. After the inclined plate sedimentation, the removal rate of suspended solids is 20%, the removal rate of COD is 10%, and the turbidity is reduced by 20%. The effluent from the inclined plate settling tank enters the multi-media filter.

[0046] (2) Multi-media filtration

[0047] The operating pressure of the multi-media filter is 0.2MPa. The multi-media filler is divided into upper, middle and lower layers. The upper layer is a core shell with a relative density of 1.1 and a particle size of 1.5mm; the middle layer is anthraci...

Embodiment 2

[0065] (1) Inclined plate settlement

[0066] The main water quality characteristics of the biochemical tail water are: pH7.54, COD: 200mg / L, TDS: 2000mg / L, total hardness: 200mg / L, suspended solids 250mg / L, color 55 times, turbidity: 20.5NTU. Enter the inclined plate settling tank and add polyferric sulfate (PFS) coagulant and liquid chlorine fungicide. The dosage of coagulant is 40ppm, fungicide is 3ppm, and the hydraulic retention time of inclined plate settling tank is 3h. After the inclined plate sedimentation, the removal rate of suspended solids is 22%, the removal rate of COD is 12%, and the turbidity is reduced by 22%. The effluent from the inclined plate settling tank enters the multi-media filter.

[0067] (2) Multi-media filtration

[0068] The operating pressure of the multi-media filter is 0.4MPa. The multi-media filler is divided into upper, middle and lower layers. The upper layer is a core shell with a relative density of 1.1 and a particle size of 1.5mm; the...

Embodiment 3

[0086] (1) Inclined plate settlement

[0087] The main water quality characteristics of biochemical tail water are: pH7.88, COD: 300mg / L, TDS: 2000mg / L, total hardness: 250mg / L, suspended matter 350mg / L, chromaticity 60 times, turbidity: 30.2NTU. Enter the inclined plate settling tank and add PAC and PAM coagulant and chlorine dioxide fungicide, the dosage of PAC is 100ppm, the dosage of PAM is 1ppm, the fungicide is 5ppm, and the hydraulic retention time of the inclined plate settling tank is 4h. After the inclined plate sedimentation, the removal rate of suspended solids is 25%, the removal rate of COD is 12%, and the turbidity is reduced by 25%. The effluent from the inclined plate settling tank enters the multi-media filter.

[0088] (2) Multi-media filtration

[0089] The operating pressure of the multi-media filter is 0.6MPa. The multi-media filler is divided into upper, middle and lower layers. The upper layer is a core shell with a relative density of 1.1 and a parti...

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Abstract

The invention provides a zero emission process of advanced treatment of coal chemical biochemical tail water. The zero emission process comprises the following steps: removing COD by macroporous resin adsorption, performing nanofiltration treatment on a desorption liquid by using a ceramic membrane, and performing incineration disposal on the concentrated resin desorption liquid. The problem that the resin desorption liquid is difficult to dispose is solved; and the strong brine is treated by a method of nanofiltration, reverse osmosis, nanofiltration, membrane distillation and evaporative crystallization, thereby not only realizing zero emission, but also producing a byproduct salt, reducing the treatment cost and realizing the zero emission of coal chemical wastewater.

Description

technical field [0001] The invention relates to a recovery and treatment method of biochemical tail water, more specifically, a treatment process for performing advanced treatment and reuse of biochemical tail water in a coal chemical process to achieve zero discharge. Background technique [0002] my country's coal chemical projects are mainly distributed in areas rich in coal resources such as Shanxi, Shaanxi, Henan, Inner Mongolia and Xinjiang, but these areas are often also water-scarce. Coal chemical projects consume a lot of water and produce a large amount of wastewater containing toxic and harmful substances such as phenols, aromatic hydrocarbons, heterocyclics, and ammonia nitrogen. Industrial wastewater and domestic sewage in industries such as coal chemical industry, petrochemical industry and metallurgy are generally treated with the process of "pretreatment + biochemical treatment + advanced treatment". The biochemical tail water is subjected to advanced treatme...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10C01D3/04C01F11/18C01F5/24
CPCC01D3/04C01F5/24C01F11/18C02F1/001C02F1/048C02F1/285C02F1/441C02F1/442C02F1/444C02F1/447C02F1/50C02F1/5236C02F1/5245C02F1/56C02F5/10C02F5/14C02F9/00C02F2001/5218C02F2301/08C02F2303/16Y02A20/131
Inventor 刘航范辉崔晓曦段星马国强郑笑彬李志博谢淳宋乐
Owner SEDIN ENG
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