Method for treating coking waste water after ammonia removal

A technology for coking wastewater and wastewater, applied in chemical instruments and methods, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., can solve the problems of high price of activated carbon, increase the cost of wastewater treatment, etc., and achieve good environmental effects , the effect of low loss rate and mild reaction conditions

Active Publication Date: 2011-09-07
宜兴蓝必盛化工环保技术研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The activated carbon adsorption method can achieve a high COD removal rate, but the activated carbon itself is expensive, and the loss of each activated carbon regeneration in actual operation exceeds 10%, which increases the cost of wastewater treatment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Pump the coking wastewater after ammonia removal into the catalytic oxidation inlet pool, add sulfuric acid to adjust the pH to 4; pass the obtained wastewater into a security filter to intercept the suspended solids in the water; add 20% hydrogen peroxide to the obtained wastewater, and the mixture of wastewater and hydrogen peroxide The weight ratio is 230:1, and then the waste water is pumped into the catalytic oxidation tower, the waste water and hydrogen peroxide are contacted and mixed with the fixed surface catalyst in the tower, and catalytic oxidation occurs, and the reaction time is 1.5h; the obtained waste water is passed into the biochemical distribution tank, Add 4ml of 30% sodium hydroxide solution per liter of wastewater to adjust the pH to 7.5; pump the obtained wastewater into a facultative + aerobic biochemical system, and degrade the wastewater through the decomposition of facultative bacteria Enterobacter and aerobic bacteria Mycobacterium The organic...

Embodiment 2

[0028] Pump the coking wastewater after ammonia removal into the catalytic oxidation inlet pool, add hydrochloric acid to adjust the pH to 5; pass the obtained wastewater into the security filter to intercept the suspended solids in the water; add 22.5 hydrogen peroxide to the obtained wastewater, and then pump the wastewater into In the catalytic oxidation tower, the weight ratio of waste water and hydrogen peroxide is 200:1. The waste water and hydrogen peroxide are contacted and mixed with the surface catalyst fixed in the tower, and catalytic oxidation occurs. The reaction time is 2 hours; Add 6ml of 25% sodium hydroxide solution to the wastewater to adjust the pH to 7.8; pump the obtained wastewater into the facultative + aerobic biochemical system, and degrade the organic matter in the wastewater through the decomposition of facultative bacteria Bacillus and aerobic bacteria Pollutants, and then through the partial reflux of the mixture of activated sludge and water with ...

Embodiment 3

[0030] Pump the coking wastewater after ammonia removal into the catalytic oxidation inlet pool, add hydrochloric acid to adjust the pH to 6; pass the obtained wastewater into a security filter to intercept the suspended solids in the water; add 30% hydrogen peroxide to the obtained wastewater, the mixture of wastewater and hydrogen peroxide The weight ratio is 180:1, and then the waste water is pumped into the catalytic oxidation tower, and the waste water and hydrogen peroxide are contacted and mixed with the surface catalyst fixed in the tower, and catalytic oxidation occurs, and the reaction time is 2.5 hours; the obtained waste water is passed into the biochemical distribution pool, Add 8ml of 15% sodium hydroxide solution per liter of wastewater to adjust the pH to 8; pump the resulting wastewater into a facultative + aerobic biochemical system, through the decomposition of facultative bacteria Klebsiella and aerobic bacteria Begerinck , degrade the organic pollutants in ...

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PUM

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Abstract

The invention discloses a method for treating coking waste water after ammonia removal, which comprises the following steps: regulating the pH of the coking waste water after ammonia removal to 4-6; introducing the waste water into a safety filter and intercepting suspended materials in the water; adding hydrogen peroxide into the waste water and generating catalytic oxidation in the presence of a surface catalyzing agent for the reaction time of 1.5-2.5h; ntroducing the waste water into a biochemical distributing reservoir and regulating the pH to 7.5-8; pumping the waste water into a biochemical system for degrading organic pollutants in the waste water and removing total nitrogen pollutants in the waste water for the dwell time of 18-30 hours; introducing the mixed fluid of the waste water and sludge together into a secondary settling tank; discharging a supernatant reaching a standard; and transporting the sludge out for treatment. The method of the invention is carried out at normal temperature and pressure, and has mild reaction condition, high degree of automation, simple operation and small equipment investment, and the effluent water after biochemical treatment can completely reach the standard and be discharged, thereby reducing the pollutant to a low level, greatly reducing the chroma and having good environmental effect.

Description

technical field [0001] The invention relates to a method for treating sewage, in particular to a method for treating coking wastewater after ammonia removal. Background technique [0002] Pollutants contained in coking wastewater include phenols, polycyclic aromatic compounds, and heterocyclic compounds containing nitrogen, oxygen, and sulfur, etc. It is a typical industrial wastewater containing refractory organic compounds. The easily degradable organic substances in coking wastewater are mainly phenolic compounds and benzene compounds, and pyrrole, naphthalene, furan, and imidazole belong to the degradable organic substances. Refractory organic compounds mainly include pyridine, carbazole, biphenyl, terphenyl, etc. The water quality of coking wastewater varies greatly due to the great differences in the process flow and production operation mode of each plant. The water quality of ammonia distillation wastewater in general coking plants is as follows: CODcr3000-3800mg / L...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/14C02F101/34C02F101/38C02F101/32
Inventor 蒋伟群黄强王明高峰
Owner 宜兴蓝必盛化工环保技术研究院有限公司
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