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Treatment method for biological nitrogen removal of reinforced sewage

A treatment method and biological technology for sewage, which is applied in the fields of water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc. Low problems, to achieve the effect of reducing aeration volume, high controllability, and strengthening nitrification function

Active Publication Date: 2012-06-06
NORTH CHINA MUNICIPAL ENG DESIGN & RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Traditional biological denitrification is composed of nitrification process and denitrification process. Due to the low temperature, the activity of nitrification and denitrification bacteria decreases, the reaction rate is low, and the proliferation is slow, resulting in slow nitrification and denitrification reactions, and denitrification is limited. This has always been a technical difficulty that the traditional activated sludge process cannot avoid and solve

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  • Treatment method for biological nitrogen removal of reinforced sewage
  • Treatment method for biological nitrogen removal of reinforced sewage
  • Treatment method for biological nitrogen removal of reinforced sewage

Examples

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Effect test

Embodiment 1

[0036] Example 1: When the carbon source is relatively sufficient and the water temperature is high, operate in the A-AAO mode. 30% of the sewage treated by fine screens, grit chambers and other facilities and the return sludge enter ① the return sludge denitrification unit, and the outflow of the return sludge denitrification unit and 70% of the sewage enter the ② anaerobic unit. The outflow of the oxygen unit and the reflux mixture of the aerobic unit enter into ③ the anoxic composite unit of activated sludge and biofilm, and the anoxic composite unit is added with 20% artificial suspension filler, and interception devices such as interception nets are installed at the outflow . The outflow of the anoxic unit enters ④ the transition unit of activated sludge, and the outflow of the transition unit enters ⑤ the aerobic composite unit of activated sludge and biofilm or embedded bacteria, and the aerobic composite unit is added with 20% artificial suspended filler , and its out...

Embodiment 2

[0037] Example 2: When the carbon source is relatively sufficient and the water temperature is not high, operate in A-AAO mode. 10% of the sewage treated by fine screens, grit chambers and other facilities and the return sludge enter the ① return sludge denitrification unit, and the outflow of the return sludge denitrification unit and 90% of the sewage enter the ② anaerobic unit. The outflow of the oxygen unit and the reflux mixture of the aerobic unit enter into ③ the anoxic composite unit of activated sludge and biofilm, and the anoxic composite unit is added with 40% artificial suspended filler, and interception devices such as interception nets are installed at the outflow . The outflow of the anoxic compound unit enters into the transition unit of ④ activated sludge, and the outflow of the transition unit enters into the aerobic compound unit of ⑤ activated sludge and biofilm. The aerobic compound unit adds 45% artificial suspended filler and its output The flow is equi...

Embodiment 3

[0038] Example 3: When the carbon source is insufficient, operate in the denitrification AO mode. Sewage treated by fine screens, grit chambers and other facilities, return sludge from secondary settling tanks, and return mixed liquor from aerobic units enter ① return sludge denitrification unit, and then flow through ② anaerobic unit, ③ activated sludge Anoxic unit combined with biofilm and ④ transition unit. Add 20% to 40% of artificial suspended filler to the anoxic unit, and install intercepting devices such as intercepting nets at the outflow. According to the influent carbon source and the carbon source required for denitrification, etc., carbon source methanol and / or acetate can be added to the inflow end of the return sludge denitrification unit. The transition unit can adopt the composite process of activated sludge and biofilm, or the activated sludge process. If the composite process is adopted, 10% to 50% of artificial suspended filler should be added, and interce...

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Abstract

The invention discloses a treatment method for biological nitrogen removal of reinforced sewage, which comprises the following steps of: 1, feeding all or partial treated sewage and sludge refluxed from a secondary sedimentation tank into a reflux sludge denitrification unit together by adopting division point inflow; 2, feeding the outflow of the reflux sludge denitrification unit and the residual sewage to an anaerobic unit or an anoxic unit; 3, feeding the outflow of the anaerobic unit to the anoxic unit, and refluxing the mixed solution of an aerobic unit to the anoxic unit; 4, feeding the outflow of the anoxic unit to a transition unit; 5, feeding the outflow of the transition unit to the aerobic unit, and refluxing the mixed solution of the aerobic unit to the anoxic unit from the outflow end of the aerobic unit; and 6, feeding the outflow of the aerobic unit to the secondary sedimentation tank to perform sludge-water separation. The method can be operated in multiple modes of A-A2O, nitrogen removal AO, inverse AAO and the like and has high controllability, and a system has strong nitrogen removal capability. The method is suitable for upgrade and reform of newly built sewage treatment plants of towns lacking the land and the conventional sewage treatment plants.

Description

Technical field: [0001] The invention belongs to the technical field of environmental protection sewage treatment, and in particular relates to a treatment method for strengthening sewage biological denitrification. Background technique: [0002] With the rapid development of my country's economy and the increase of population, the pollution of water environment has shown a certain trend of aggravation, and the phenomenon of eutrophication in water bodies has become more serious. Therefore, the discharge standards of pollutants in urban sewage treatment plants are becoming more and more stringent, especially the nitrogen and phosphorus indicators. And with the improvement of economic level and people's quality of life and the enhancement of environmental protection awareness, the emission standards will continue to increase. This means that my country's new sewage treatment plants and existing sewage treatment plants have put forward higher and higher requirements for nitroge...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/14C02F3/30
Inventor 郭兴芳陈立李成江孔祥媚
Owner NORTH CHINA MUNICIPAL ENG DESIGN & RES INST
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