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Simultaneity nitration denitrification biological denitrogenation method in oil-containing waste water biological treatment process

A nitrification, denitrification and biological treatment technology, which is applied in the field of oily wastewater treatment in the field of environmental protection technology, and can solve the problems of irregular dissolved oxygen control, low sludge volume and large fluctuations.

Inactive Publication Date: 2010-12-29
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is exactly for the COD / NH in the existing refinery wastewater Orbal oxidation ditch treatment process 4 + -N fluctuates greatly, the oil content in the influent water is too high, the three oxidation ditches enter water at the same time, the dissolved oxygen control is irregular, and the amount of sludge is low. Nitrogen removal method to achieve NOx-N concentration below 30mg / l

Method used

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  • Simultaneity nitration denitrification biological denitrogenation method in oil-containing waste water biological treatment process

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Effect test

Embodiment 1

[0040] The simultaneous nitrification and denitrification biological denitrification method in the biological treatment process of an oil refinery wastewater in Guangzhou includes the following steps and process conditions:

[0041] (1) Oily wastewater COD / NH 4 + -N ratio control: Oily wastewater is purified by stripping ammonia and alkali injection process, and NH is obtained from the vapor phase by heating and stripping 3 , H 2 S and CO 2 , the sewage is purified, the ammonia concentration in the oily wastewater is greatly reduced and the NH in the sewage can be regulated 4 + -N concentration (in addition, use the NH in the vapor phase 3 , H 2 S, CO 2 Solubility difference at different temperatures, ammonia and H can be separated by condensation 2 S), control of COD / NH in oily wastewater 4 + The -N ratio is about 2.87.

[0042] (2) oil separation and oil removal treatment: the treated waste water through step (1) carries out oil-water separation through advection ...

Embodiment 2

[0046] The simultaneous nitrification and denitrification biological denitrification method in the biological treatment process of an oil refinery wastewater in Guangzhou includes the following steps and process conditions:

[0047] (1) Oily wastewater COD / NH 4 + -N ratio control: Oily wastewater is purified by stripping ammonia and alkali injection process, and NH is obtained from the vapor phase by heating and stripping 3 , H 2 S and CO 2 , the sewage is purified, the ammonia concentration in the oily wastewater is greatly reduced and the NH in the sewage can be regulated 4 + -N concentration (in addition, use the NH in the vapor phase 3 , H 2 S, CO 2 Solubility difference at different temperatures, ammonia and H can be separated by condensation 2 S), control of COD / NH in oily wastewater 4 + -N ratio is about 3.05;

[0048] (2) oil separation and oil removal treatment: the oily waste water processed through step (1) carries out oil-water separation through the adv...

Embodiment 3

[0052] The simultaneous nitrification and denitrification biological denitrification method in the biological treatment process of an oil refinery wastewater in Guangzhou includes the following steps and process conditions:

[0053] (1) Oily wastewater COD / NH 4 + -N ratio control: Oily wastewater is purified by stripping ammonia and alkali injection process, and NH is obtained from the vapor phase by heating and stripping 3 , H 2 S and CO 2 , the sewage is purified, the ammonia concentration in the oily wastewater is greatly reduced and the NH in the sewage can be regulated 4 + -N concentration (in addition, use the NH in the vapor phase 3 , H 2 S, CO 2 Solubility difference at different temperatures, ammonia and H can be separated by condensation 2 S), control of COD / NH in oily wastewater 4 + -N ratio is about 3.6;

[0054] (2) oil separation, degreasing treatment: the oily wastewater processed through step (1) carries out oil-water separation through the advection...

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Abstract

The invention discloses a method for simultaneous nitrification and denitrification for nitrogen removal in a process of biological treatment of oily wastewater. The method comprises steps of ratio controlling of COD / NH4+-N of the oily wastewater, oil removal and degreasing process, homogenization treatment of equalizing tank, oxidation ditch treatment for the oily wastewater and the like, wherein the oxidation ditch treatment comprises that the oily wastewater firstly flows in an outer ditch under the action of a rolling plate, then passes through a porthole between the outer ditch and a middle ditch and enters the middle ditch, and passes through the middle porthole cycle processing and the middle porthole to enter an inner ditch, concentration of dissolved oxygen of the outer ditch is controlled to be 0-0.5mg / l, processing time of the oily wastewater in the oxidation ditch is 16-24 hours , and finally the treated water enters a secondary sedimentation tank through the inner ditch. To point against a condition that a plurality of ditches inflow in prior art, the invention is modified based on a three-ditch type oxidation ditch to become that only the first ditch of the inventioninflows, the invention intensifies backflow of sludge and water mixture of the inner ditch and the outer ditch, optimizes and controls DO concentration of an aerobic zone in the oxidation ditch and the like, and strengthens nitrification and denitrification for nitrogen removal function of nitrobacteria and denitrobacteria.

Description

technical field [0001] The invention relates to the treatment of oily wastewater in the technical field of environmental protection, in particular to a method for biological treatment of oily wastewater with high ammonia nitrogen (such as oil refinery wastewater) and simultaneous nitrification and denitrification biological denitrification. Background technique [0002] Nitrogen is an important "eutrophic" substance. Since the 1970s, with the increasingly prominent problem of "eutrophication" in water bodies and the continuous tightening of sewage discharge standards, the traditional biological nitrogen and phosphorus removal technologies and processes have obviously failed to meet the new requirements, and there is an urgent need to study new denitrification Nitrogen theory and techniques to solve problems in wastewater treatment. In particular, the biological denitrification of high-ammonia nitrogen oil refinery wastewater, chemical fertilizer wastewater, landfill leachat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F3/02C02F1/66C02F1/58C02F1/52C02F1/24C02F9/14
CPCY02W10/10
Inventor 周少奇吴宋标
Owner SOUTH CHINA UNIV OF TECH