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Method for Cultivating Granular Sludge in Anaerobic/Anoxic-Aerobic Sequencing Batch Reactor

A sequencing batch reactor and granular sludge technology, which is applied in the field of wastewater biological treatment, can solve the problems of high risk of failure, disintegration of granular sludge, etc., and achieve the effect of improving the settling performance and increasing the biological denitrification efficiency of the reactor

Inactive Publication Date: 2011-12-21
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The main problem of this method is that changing the operation mode of the reaction stage will easily lead to the disintegration of the granular sludge, and the risk of failure is greater

Method used

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  • Method for Cultivating Granular Sludge in Anaerobic/Anoxic-Aerobic Sequencing Batch Reactor
  • Method for Cultivating Granular Sludge in Anaerobic/Anoxic-Aerobic Sequencing Batch Reactor

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Embodiment 1

[0019] The residual sludge from the secondary settling tank of Waseca domestic sewage treatment plant (A / O biological nitrogen removal process) in Minnesota, USA was used as the inoculation sludge for the anaerobic / anoxic-aerobic sequencing batch reactor. The anaerobic / anoxic-aerobic sequencing batch reactor is a plexiglass column with an inner diameter of 19.5 cm, a height of 40 cm, and an effective volume of 8 L. The air is supplied by the air pump through 5 sintered sand core aeration heads evenly distributed at the bottom of the reactor, the air flow of each aeration head is controlled by 5 independent glass rotameters, and the aeration volume of each aeration head is 0.6L / min, the total aeration rate of the reactor is 3L / min, and the corresponding air volume per unit reactor effective volume per unit time, that is, the aeration intensity is 6.3L / (m 3 s). The stirring paddle is connected to the bottom of the stirring shaft of the mixer, and it is stirred for 0.5h before ...

Embodiment 2

[0024] The residual sludge from the secondary sedimentation tank of Hangzhou Sibao Sewage Treatment Plant (A / O biological denitrification process) was used as the inoculation sludge for the anaerobic / anoxic-aerobic sequencing batch reactor. The reactor is a plexiglass column with an inner diameter of 20 cm, a height of 40 cm, and an effective volume of 8 L. The air is supplied by the air pump through 5 sintered sand core aeration heads evenly distributed at the bottom of the reactor, the air flow of each aeration head is controlled by 5 independent glass rotameters, and the aeration volume of each aeration head is 0.5L / min, the total aeration rate of the reactor is 2.5L / min, the air volume per effective volume of the unit reactor per unit time, that is, the aeration intensity is 5.2L / (m 3 s). The stirring paddle is connected to the bottom of the stirring shaft of the mixer, and it is stirred during the air pump aeration process and the first 50% of the anaerobic / anoxic stage...

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Abstract

The invention discloses a method for cultivating granular sludge in an anaerobic / anoxic-aerobic sequencing batch reactor. The characteristics are: 1) The inoculation sludge of the reactor is the sludge of an urban sewage treatment plant that adopts the biological denitrification process; 2) The wastewater containing organic matter and ammonia nitrogen enters the reactor in 2 to 5 steps, and the reactors are sequentially chronologically after entering the water After going through anaerobic / anoxic and aerobic stages, the last step of water inflow to the reactor and the subsequent anaerobic / anoxic and aerobic stages are followed by sludge sedimentation and one step of drainage. The invention adopts a step-by-step water inflow strategy to strengthen the denitrification carbon source supply of the influent organic matter in the sequencing batch reactor, improve the denitrification efficiency, and avoid the inhibition of biological toxicity caused by the accumulation of nitrate nitrogen in the reactor and the sludge granulation In addition, step-by-step water intake increases the frequency of substrate abundance and deficiency, and promotes sludge agglomeration. The granular sludge cultivated according to the method helps to improve the sludge settling performance of the reactor, and creates favorable conditions for improving the biological denitrification efficiency of the reactor.

Description

technical field [0001] The invention relates to wastewater biological treatment, in particular to a method for cultivating granular sludge in an anaerobic / anoxic-aerobic sequencing batch reactor. Background technique [0002] Since nitrogen is one of the main causes of water eutrophication, biological denitrification has become an important task in the biological treatment of wastewater. The alternating operation of anaerobic / anoxic and aerobic in the reaction stage of the sequencing batch reactor is the basic process of the biological denitrification sequencing batch reactor, while the cultivation of granular sludge in the anaerobic / anoxic-aerobic sequencing batch reactor It is an important means to improve the performance of sludge in the reactor. The main method of cultivating granular sludge in a sequencing batch reactor is to shorten the hydraulic retention time, or increase the aeration intensity to strengthen the hydraulic classification in the reactor to wash out li...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F3/30
Inventor 韩志英陈英旭石德智丁颖
Owner ZHEJIANG UNIV
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