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High-COD phenol-containing sewage treatment method

A sewage treatment method and phenolic technology, which is applied in the field of high COD and phenolic sewage treatment, can solve the problems of excessive COD, unsolvable, strong toxicity, etc., and achieve the effects of reducing treatment load, reducing chroma, and low cost

Inactive Publication Date: 2020-09-01
闫娟
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, most of the sewage COD removal in the sewage treatment system adopts biological methods, which can meet the treatment requirements of urban domestic sewage with a COD content of about 400-600 mg / L, while the COD content in industrial sewage is 1000-10000 mg / L. Higher, and phenolic sewage is highly toxic to microorganisms, which will inhibit the activity of sludge in the biochemical tank, resulting in serious COD in the effluent. Therefore, traditional sewage treatment technology cannot solve the problem of such high COD phenolic sewage treatment

Method used

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  • High-COD phenol-containing sewage treatment method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A kind of high COD contains phenolic sewage treatment method, comprises the following steps:

[0034] Step 1. Phenol stripping: Pass the high-COD phenolic sewage into the regulating tank for water quality and water adjustment, remove impurities and suspended solids, and then enter the phenol stripping reactor. The stripping treatment pressure is 0.6MPa, temperature 95°C, blow-off time 4h, collect the separated phenols through the collector, and recycle them. The content of phenols is 27mg / L by sampling at the water outlet, and the removal rate is 87.4%;

[0035] Step 2. Enhanced coagulation: Pass the effluent from the phenol stripping reactor into the enhanced coagulation tank, add composite flocculant, pre-stir at 200r / min for 20s, then stir rapidly at 400r / min for 2min, and then adjust the speed to 50r / min Stir at a slow speed for 10 minutes, stop stirring, and let stand for 15 minutes, then discharge the coagulated sewage to the advection sedimentation tank, let it s...

Embodiment 2

[0043] A kind of high COD contains phenolic sewage treatment method, comprises the following steps:

[0044] Step 1. Phenol stripping: Pass the high COD phenolic sewage into the regulating tank to adjust the water quality and water quantity, remove impurities and suspended solids, and then enter the phenol stripping reactor. The stripping treatment pressure is 0.7MPa, temperature 96°C, blow-off time 3.5h, collect the separated phenols through the collector, and recycle them. The content of phenols in the water outlet is 22mg / L, and the removal rate is 89.7%;

[0045] Step 2. Enhanced coagulation: Pass the effluent from the phenol stripping reactor into the enhanced coagulation tank, add a composite flocculant, pre-stir at 200r / min for 40s, then stir rapidly at 400r / min for 3min, and then adjust the speed to 50r / min Stir at a slow speed for 15 minutes, stop stirring, and let it stand for 25 minutes, then discharge the coagulated sewage to the advection sedimentation tank, let i...

Embodiment 3

[0053] A kind of high COD contains phenolic sewage treatment method, comprises the following steps:

[0054] Step 1. Phenol stripping: Pass the high COD phenolic sewage into the regulating tank to adjust the water quality and water quantity, remove impurities and suspended solids, and then enter the phenol stripping reactor. The stripping treatment pressure is 0.5MPa, temperature 95°C, blow-off time 4h, collect the separated phenols through the collector, and recycle them. The content of phenols was 33mg / L by sampling at the water outlet, and the removal rate was 84.6%;

[0055] Step 2. Enhanced coagulation: Pass the effluent from the phenol stripping reactor into the enhanced coagulation tank, add a composite flocculant, pre-stir at 200r / min for 30s, then stir rapidly at 400r / min for 2min, and then adjust the speed to 50r / min Stir at a slow speed for 13 minutes, stop stirring, and let it stand for 20 minutes, then discharge the coagulated sewage to the advection sedimentation t...

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Abstract

The invention discloses a high-COD (Chemical Oxygen Demand) phenol-containing sewage treatment method. Phenol is removed through pretreatment, suspended solids, organic pollutants, heavy metals and colloids are removed through coagulating sedimentation, so that the load of a subsequent working section is reduced. Through the electrochemical-photocatalysis-ozone synergy, the yield of active groupsin the treatment process is higher, and the oxidability is stronger. Mass transfer is promoted through an internal circulation structure, and the processing time is reduced. Residual phenols and otherorganic pollutants can be thoroughly removed, and meanwhile, the effect of releasing complex heavy metals is achieved. Most of heavy metal ions are removed through aeration-electric flocculation treatment, residual trace heavy metal, organic pollutants and part of inorganic salt in water are removed through filtration by a polyethyleneimine grafted nanofiltration membrane filter, and the water quality is improved. Finally, a two-stage reverse osmosis system is adopted for desalination, and the effluent quality reaches the standard of industrial reuse water.

Description

technical field [0001] The invention relates to the technical field of environmental protection, in particular to a method for treating high-COD sewage containing phenols. Background technique [0002] Phenol-containing wastewater mainly comes from coking plants, gas plants, petrochemical plants, insulation material plants and other industrial sectors, as well as the production process of petroleum cracking to ethylene, synthetic phenol, polyamide fiber, synthetic dyes, organic pesticides and phenolic resin. At present, most of the sewage COD removal in the sewage treatment system adopts biological methods, which can meet the treatment requirements of urban domestic sewage with a COD content of about 400-600 mg / L, while the COD content in industrial sewage is 1000-10000 mg / L. Higher, and phenolic sewage is highly toxic to microorganisms, which will inhibit the activity of sludge in the biochemical tank, resulting in serious COD in the effluent. Therefore, traditional sewage ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/06C02F101/34C02F101/30
CPCC02F9/00C02F2101/345C02F1/20C02F1/5236C02F1/56C02F1/461C02F1/30C02F1/78C02F1/463C02F1/442C02F1/441C02F2101/30Y02A20/131
Inventor 闫娟
Owner 闫娟
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