Biological denitrification system and method for low C/N ratio high strength ammonia chemical comprehensive wastewater

A technology that integrates wastewater and low carbon to nitrogen ratio, applied in the field of industrial sewage treatment, can solve the problems of complex water quality, large water quality changes, low carbon and nitrogen, etc., to achieve the effect of stable removal effect and strong impact load resistance.

Inactive Publication Date: 2008-09-03
ZHEJIANG UNIV
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Problems solved by technology

[0011] The purpose of the present invention is to provide a biological denitrification system for comprehensive chemical wastewater with a low carbon-to-nitrogen ratio and high ammonia-nitrogen ratio, and to address the deficiencies of various biological denitrification methods for comprehensive chemical wastewater with large water quality changes, complex water quality components, and low carbon-nitrogen ratios. method

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  • Biological denitrification system and method for low C/N ratio high strength ammonia chemical comprehensive wastewater

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Embodiment 1

[0024] Example 1, treatment of low-load organic nitrogen, water quality characteristics: COD: 285.00mg / L-804.00mg / L, average 449.50mg / L; KN: 55.00mg / L-74.00mg / L, average 59.68mg / L , of which KN consists of organic nitrogen accounting for 30% and ammonia nitrogen accounting for 70%. In the hydrolytic acidification tank and the first aerobic tank, the metabolic function of heterotrophic bacteria is mainly used to decompose the refractory organic matter into biodegradable small molecule organic matter, and at the same time mineralize organic nitrogen to degrade and remove most of the easily biodegradable organic matter. The return sludge in the sedimentation tank is returned by the return pump to the first stage of hydrolytic acidification pond and the first stage of aerobic pond, with a return ratio of 0.6; in the second aerobic pond, autotrophic nitrifying bacteria are mainly used, combined with heterotrophic bacteria in the anoxic pond to complete the waste water Effective rem...

Embodiment 2

[0025] Example 2, treatment of medium load organic nitrogen, water quality characteristics of treated water: COD: 409mg / L-619mg / L, average 484.54mg / L; KN: 71mg / L-91mg / L, average 81.61mg / L, of which KN The composition of organic nitrogen accounts for 67%, and ammonia nitrogen accounts for 33%. In the hydrolytic acidification tank and the first aerobic tank, the metabolic function of heterotrophic bacteria is mainly used to decompose the refractory organic matter into biodegradable small molecule organic matter, and at the same time mineralize organic nitrogen to degrade and remove most of the easily biodegradable organic matter. The return sludge in the settling tank is returned by the return pump to the first stage of hydrolytic acidification pond and the first stage of aerobic pond, with a reflux ratio of 0.5; in the second aerobic pond, autotrophic nitrifying bacteria are mainly used, combined with heterotrophic bacteria in the anoxic pond to complete the wastewater treatment...

Embodiment 3

[0026] Example 3, high-load organic nitrogen treatment, water quality characteristics: COD: about 600mg / L; KN: about 210mg / L, influent organic nitrogen about 65mg / L. In the hydrolytic acidification tank and the first aerobic tank, the metabolic function of heterotrophic bacteria is mainly used to decompose the refractory organic matter into biodegradable small molecule organic matter, and at the same time mineralize organic nitrogen to degrade and remove most of the easily biodegradable organic matter. The return sludge in the sedimentation tank is returned by the return pump to the first stage of hydrolytic acidification pond and the first stage of aerobic pond, with a return ratio of 0.8; in the second aerobic pond, autotrophic nitrifying bacteria are mainly used, combined with heterotrophic bacteria in the anoxic pond to complete the waste water For the effective removal of ammonia nitrogen in the medium, the return sludge from the secondary sedimentation tank is returned to...

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Abstract

The invention discloses a biological denitrogenation system for low carbonnitrogen ratio high ammonia-nitrogen chemical engineering synthetic wastewater and a method thereof, and belongs to the environment protective technology field. The method adopts the steps that refractory biodegradable organic matter is decomposed into biodegradable micromolecule organic matter by the water in a distributing reservoir via a first section of A / O processing unit of a hydrolysis and acidification tank, a first aeration tank and a first settling tank through the heterotrophic bacteria culture, organic nitrogen is mineralized, and most of biodegradable organic matter is removed through degrading; then the ammooinacal nitrogen in waste water can be effectively removed by the water via a second section of A / O processing unit of an anoxybiotic tank, a second aeration tank and a second settling tank through the autotrophy type nitrobacter and combining with the heterotrophic bacteria in the anoxybiotic tank. The method has the outstanding advantages and effects that the bruise resistance bearing capacity of the processing system is strong, the refractory biodegradable organic matter in chemical wastewater can be effectively removed, the removing effect is steady, and the removal rate of outflow COD is steadily lower than 100 mg / L; the organic nitrogen and ammonia nitrogen in the chemical wastewater can also be effectively removed, the ammonification rate of the organic nitrogen is larger than or equal to 90 percent, and effluent ammonia nitrogen is steadily lower than 30 mg / L.

Description

technical field [0001] The invention relates to industrial sewage treatment in the field of environmental protection, in particular to a biological nitrogen removal system and method for comprehensive chemical wastewater with low carbon-to-nitrogen ratio and high ammonia-nitrogen. Background technique [0002] At present, the biological denitrification process of wastewater mainly includes: [0003] (1) Nitrification-denitrification process [0004] Nitrification-denitrification process is a mature wastewater biological denitrification technology, and it is also the most widely used nitrogen pollution control technology. The process usually uses two reactors or divides one reactor into two compartments for nitrification and denitrification respectively. The nitrification process mainly uses autotrophic nitrifying bacteria to convert NH 4 + -N oxidation to NO 3 - -N, the denitrification process mainly uses heterotrophic denitrifying bacteria to convert NO 3 - -N rever...

Claims

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Application Information

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IPC IPC(8): C02F3/30
Inventor 李文红杜平严福平陈英旭
Owner ZHEJIANG UNIV
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