Aerobic granular sludge culture method suitable to low-concentration domestic sewage

A technology for aerobic granular sludge and domestic sewage, applied in biological water/sewage treatment, chemical instruments and methods, water/sludge/sewage treatment, etc. Long mud time and other problems, to achieve the effect of good sedimentation, good sedimentation, and shortening the incubation time

Inactive Publication Date: 2011-04-13
BEIJING NORMAL UNIVERSITY
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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 to propose a method for cultivating aerobic granular sludge aimed at low-concentration domestic sewage, which solves the problems of long time, difficulty and unstable particles in cultivat

Method used

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  • Aerobic granular sludge culture method suitable to low-concentration domestic sewage
  • Aerobic granular sludge culture method suitable to low-concentration domestic sewage
  • Aerobic granular sludge culture method suitable to low-concentration domestic sewage

Examples

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Example Embodiment

[0029] Example 1

[0030] (1) Bioreactor: The reactor is made of plexiglass, with a height of 120cm, an inner diameter of 8cm, and an effective volume of 5.5L. Air enters the reactor through a microporous aeration head installed in the center of the bottom of the reactor by an air pump, and the formed airflow pushes the liquid and granular sludge in the reactor to move upward, and the water outlet is located in the middle of the reactor. The water inlet, aeration, sedimentation and drainage time of the reactor are automatically controlled by time relays. The whole experimental setup is as figure 1 shown.

[0031] (2) Source of inoculated sludge and domestic sewage: take activated sludge from a secondary sedimentation tank of a city sewage treatment plant, settle for 30 minutes, remove the supernatant, add fresh inorganic salt culture solution, air exposure for 2 hours, settle again for 30 minutes, and remove the supernatant liquid. The thickened sludge was added to the rea...

Example Embodiment

[0034] Example 2

[0035] (1) Bioreactor: The reactor is made of plexiglass, with a height of 100cm and an inner diameter of 6cm. The air is fed into the reactor by an air pump through a microporous aeration head installed in the center of the bottom of the reactor, and the air flow formed pushes the liquid and air in the reactor. The granular sludge moves upward, and the water outlet is located in the middle of the reactor. The water inlet, aeration, sedimentation and drainage time of the reactor are automatically controlled by time relays.

[0036] (2) Source of inoculated sludge and domestic sewage: take activated sludge from a secondary sedimentation tank of a city sewage treatment plant, settle for 30 minutes, remove the supernatant, add fresh inorganic salt culture solution, air exposure for 2 hours, settle again for 30 minutes, and remove the supernatant liquid. The thickened sludge was added to the reactor. The initial sludge concentration inoculum was about 7gMLSS / ...

Example Embodiment

[0039] Example 3

[0040] (1) Bioreactor: The height of the reactor is 150cm, the inner diameter is 8cm, a microporous aeration head is installed in the center of the bottom, and the water inlet and outlet are located at the bottom and the upper part of the reactor. The water inlet, aeration, sedimentation and drainage time of the reactor are automatically controlled by time relays.

[0041] (2) Source of inoculated sludge and domestic sewage: take activated sludge from a secondary sedimentation tank of a city sewage treatment plant, settle for 30 minutes, remove the supernatant, add fresh inorganic salt culture solution, air exposure for 2 hours, settle again for 30 minutes, and remove the supernatant liquid. The thickened sludge was added to the reactor. The initial sludge concentration inoculum was about 8 gMLSS / L. The domestic sewage is domestic sewage in a certain city, and the water quality indicators are as follows (mg / L): BOD: 80-135, COD: 160-250, TN: 15-30, NH 4 ...

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Abstract

The invention discloses an aerobic granular sludge culture method suitable to low-concentration domestic sewage, belonging to the field of environmental protection and resource comprehensive-water pollution prevention and control technology. The method comprises two stages of material supplement operation and low-load operation and particularly includes the following steps of: firstly, inoculating flocculent active sludge to an aerobic granular sludge culture reactor, and then supplementing and adding an easily degradable carbon source to low-concentration domestic sewage to adjust inflow COD(Chemical Oxygen Demand) to be 600-800mg/L; culturing active sludge in an inflowing-aerating-precipitating-water draining sequential operation mode into semi-cultured or completely-cultured aerobic granular sludge; and then keeping culturing with the low-concentration domestic sewage; and finally carrying out low-load acclimation and culture on aerobic granules in an inflowing-aerating-precipitating-standing-water draining sequential operation mode. The sludge granules have large size and high removal rate up to 90% to COD in the low-concentration domestic sewage, as well as high ammonia and nitrogen removal rate of more than 93%.

Description

technical field [0001] The invention belongs to the technical field of environmental protection and resource integration-water pollution prevention and control, and in particular relates to an aerobic granular sludge cultivation method suitable for low-concentration domestic sewage. Background technique [0002] Aerobic granular sludge is an aggregate formed by a variety of microorganisms. It has high biological density, strong metabolic activity, good settling properties, and strong ability to resist the impact of toxic and harmful substances, and has attracted widespread attention from environmental protection researchers at home and abroad. Aerobic granular sludge can not only degrade organic matter, but also has the function of denitrification and phosphorus removal at the same time. According to some studies, compared with the traditional activated sludge method, the urban sewage treatment plant using aerobic granular sludge technology can reduce the floor area by 80%, ...

Claims

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Application Information

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IPC IPC(8): C02F3/12
CPCY02W10/10
Inventor 全向春杨志峰
Owner BEIJING NORMAL UNIVERSITY
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