Method for synchronously removing paracresol, ammonia nitrogen and nitrate in waste water

A technology of p-cresol and nitrate, which is applied in chemical instruments and methods, water pollutants, water treatment parameter control, etc., can solve problems such as process coupling failure and application limitations, achieve high treatment efficiency, reduce energy consumption, and run The effect of low cost

Active Publication Date: 2016-02-17
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these processes are limited to the accumulation of nitrite by the strategy of limited carbon source. If the carbon source is sufficient, the anammox bacteria will be inhibited, and the coupling of denitrification and anammox process will fail, so that the process applications are limited

Method used

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  • Method for synchronously removing paracresol, ammonia nitrogen and nitrate in waste water
  • Method for synchronously removing paracresol, ammonia nitrogen and nitrate in waste water
  • Method for synchronously removing paracresol, ammonia nitrogen and nitrate in waste water

Examples

Experimental program
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Effect test

Embodiment 1

[0023] First, the sludge from the secondary settling tank of the urban sewage treatment plant was used as the seed sludge, which was added to the anaerobic SBR reactor, and then according to Ac - -C / NO 3 - -N (mass ratio) is 2.0, NO 3 - -N / NH 4 + -N (mass ratio) is 5.0, add nitrate, acetate and ammonia nitrogen to the influent, at a temperature of 30°C, a pH value of 7.5, and a hydraulic retention time of 24 hours, to domesticate heterotrophic denitrifying microorganisms, Oxyammox microorganisms, when the removal rate of nitrate, acetate and ammonia nitrogen in the system reaches 85%, the two types of microorganisms reach a balance through competition and synergy, and the domestication is completed; 2. At a temperature of 30°C and a pH of 7.5, Under the condition of hydraulic retention time of 96 hours, according to p-Cr-C / NO 3 - -N (mass ratio) is 0.4, NO 3 - -N / NH 4 + -N (mass ratio) is 1.5, and the water volume load (in N) is 2.0kgN / m 3 d, Passing waste water co...

Embodiment 2

[0025] 1. First, the sludge from the secondary settling tank of the urban sewage treatment plant is used as the inoculation sludge, which is added to the anaerobic CSTR reactor, and then according to Ac - -C / NO 3 - -N (mass ratio) is 3.0, NO 3 - -N / NH 4 + -N (mass ratio) is 6.0. Add nitrate, acetate and ammonia nitrogen to the influent. Under the conditions of temperature 20°C, pH 8.0, and hydraulic retention time 72 hours, heterotrophic denitrifying microorganisms, anaerobic Ammonia oxidizing microorganisms, when the removal rate of nitrate, acetate and ammonia nitrogen in the system reaches 85%, the two types of microorganisms reach a balance through competition and synergy, and then complete domestication; 2. At a temperature of 30°C, a pH of 8.0, hydraulic Under the condition of residence time of 8 hours, according to p-Cr-C / NO 3 - -N (mass ratio) is 1.0, NO 3 - -N / NH 4 + -N (mass ratio) is 1.0, and the water volume load (in N) is 1.0kgN / m 3 d, pass into waste ...

Embodiment 3

[0027] 1. Firstly, the anaerobic digested sludge of the urban sewage treatment plant is used as the inoculation sludge, which is added to the anaerobic EGSB reactor, and then according to Ac - -C / NO 3 - -N (mass ratio) is 2.5, NO 3 - -N / NH 4 + -N (mass ratio) is 5.5. Add nitrate, acetate and ammonia nitrogen to the influent. Under the conditions of temperature 35°C, pH 8.5, and hydraulic retention time 36 hours, heterotrophic denitrifying microorganisms, anaerobic Ammonia oxidizing microorganisms, when the removal rate of nitrate, acetate and ammonia nitrogen in the system reaches 87%, the two types of microorganisms reach a balance through competition and synergy, and then complete domestication; 2. At a temperature of 35°C, a pH of 8.5, hydraulic Under the condition of residence time of 72 hours, according to p-Cr-C / NO 3 - -N (mass ratio) is 0.8, NO 3 - -N / NH 4 + -N (mass ratio) is 0.8, and the water volume load (in N) is 0.6kgN / m 3 d, pass into waste water conta...

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Abstract

The invention discloses a novel method for synchronously removing paracresol, ammonia nitrogen and nitrate in waste water. According to the method, intermediate phenol-containing metabolite in denitrification and degradation of paracresol is accumulated through adjustment of redox potentials, accumulation of nitrite is further promoted, on the basis, under the action of anaerobic ammonia-oxidizing microorganisms and other microorganisms within a system, paracresol, ammonia nitrogen and nitrate can be removed synchronously, and products are carbon dioxide and nitrogen which are free of secondary pollution. The method can be operated continuously or intermittently and has the advantages of being high in processing efficiency, free of secondary pollution, small in occupied area, low in operating cost and the like.

Description

technical field [0001] The invention relates to the field of wastewater treatment, in particular to a method for synchronously removing p-cresol, ammonia nitrogen and nitrate. technical background [0002] The rapid development of petroleum, petrochemical, pesticide, fine chemical and other industries has produced a large amount of cresol-containing nitrogen-containing wastewater. Taking the acid water of petrochemical enterprises as an example, it contains not only p-cresol but also ammonia nitrogen and nitrate. If such wastewater is not treated and discharged directly, it will cause serious harm to the environment. A small amount of p-cresol will cause damage to liver, kidney, pancreas and other organs, inhibit the central nervous system, and cause serious harm to human health. Ammonia nitrogen can not only cause hypoxia in human tissues, but also cause eutrophication of water bodies and damage aquatic ecosystems. [0003] The traditional biological method mainly uses A...

Claims

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Application Information

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IPC IPC(8): C02F3/28C02F3/34
CPCC02F3/28C02F3/348C02F2101/163C02F2101/345C02F2101/38C02F2209/02C02F2209/06C02F2209/44C02F2301/10
Inventor 刘春爽赵东风国亚东赵朝成刘芳
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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