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Preparation and remediation method of aerobic nitrifying granular activated sludge

A granular sludge and aerobic nitrification technology, applied in chemical instruments and methods, water/sludge/sewage treatment, biological water/sewage treatment, etc., can solve the problem of internal mass transfer in aerobic granular sludge , Substrate and DO mass transfer limitation, granular sludge disintegration and other problems, to achieve high sludge concentration and microbial activity, shorten start-up time, and complete structure

Inactive Publication Date: 2009-03-18
DALIAN UNIV OF TECH
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Problems solved by technology

[0010] For aerobic nitrification granular sludge with better stability, due to the compact structure and the gradual growth of particle size, the mass transfer of substrate and DO in the particle will be limited, which will eventually lead to the disintegration of granular sludge
The growth of the structure and particle size of granular sludge is difficult to control artificially. So far, there is no good solution to the problem of mass transfer limitation in aerobic granular sludge. The method of granular sludge is particularly necessary

Method used

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  • Preparation and remediation method of aerobic nitrifying granular activated sludge

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Embodiment

[0031] 1. Preparation of aerobic nitrification granular sludge

[0032] The SBAR reactor is composed of an inner tube 9 and an outer tube, with an effective volume of 2.5 L, an outer tube with a diameter of 7.0 cm and a height of 80 cm, and an inner tube 9 with a diameter of 4.4 cm and a height of 70 cm. The air enters the reactor through the air pump 4 through a microporous aeration head 3 installed in the center of the bottom of the reactor, and the air flow formed pushes the liquid and granular sludge in the reactor to move upwards in the inner pipe 9, and then flows between the inner and outer pipe walls. After reaching the bottom of the reactor, it is pulled upward by the airflow again, so that the mixed liquid can circulate and mix evenly between the inner and outer tube walls. Water is fed into the bottom of the reactor through the metering pump 2, and the outlet is at a height of 40 cm at the bottom of the reactor. The on-off of the outlet is controlled by the solenoid...

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Abstract

The invention relates to a preparation and repair method of aerobic nitrification granular sludge, and pertains to the technical field of water treatment. The method is characterized in that a mode of improving the concentration of a substrate NH4<+>-N gradually is adopted to prepare the aerobic nitrification granular sludge and a way of adding activated sludge is adopted to repair disintegrated aerobic nitrification granular sludge. The method has the advantages of: (1) being capable of avoiding the free ammonia inhibition problem during cultivation under the condition of high NH4<+>-N so that the heterotrophic bacteria and nitrifying bacteria of the aerobic nitrification granular sludge to be formed have high activity, large particle size and relatively high denitrification capability; (2) being capable of recovering the disintegrated granular sludge to excellent performance and completer structure and shortening the start-up time of an aerobic granular sludge reactor. The aerobic nitrification granular sludge prepared by the method is suitable for treating low COD and high NH4<+>-N waste water such as catalyst wastewater and the method is a biological wastewater treatment technique with wide market application prospect.

Description

technical field [0001] The invention belongs to the technical field of wastewater biological treatment, and relates to a method for preparing and repairing aerobic nitrification granular sludge. Background technique [0002] Aerobic granular sludge is a special form of microbial immobilization technology, and it is a new type of wastewater biological treatment technology that has emerged since the 1990s. Compared with the traditional activated sludge method, the advantages of aerobic granular sludge are mainly reflected in: [0003] ①Aerobic granular sludge has the characteristics of regular and dense biological structure, high specific gravity, and fast settling speed, which can maintain a high sludge concentration and volume load in the reactor, and can greatly reduce or omit the secondary sedimentation tank, reducing The volume and floor area of ​​the sewage treatment system reduce investment and operating costs; [0004] ②Aerobic granular sludge has the diversity of mi...

Claims

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Application Information

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IPC IPC(8): C02F3/12
CPCY02W10/10
Inventor 杨凤林王新华高明明
Owner DALIAN UNIV OF TECH
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