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Method for cultivation of particle sewage sludge in anaerobic/oxygen lack-aerobic sequencing batch reactor

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

Inactive Publication Date: 2009-05-13
ZHEJIANG UNIV
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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

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  • Method for cultivation of particle sewage sludge in anaerobic/oxygen lack-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 19.5cm, a height of 40cm, and an effective volume of 8L. 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 the...

Embodiment 2

[0024] The residual sludge from the secondary settling 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, and...

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Abstract

The invention discloses a method for culturing granulated sludge in an anaerobic / anoxic-aerobic sequencing-batch reactor, which is characterized in that: 1) inoculated sludge of the reactor is sludge of urban sewage disposal plants by adopting a biological denitrogenation technology; and 2) wastewater containing organic substances and ammonia nitrogen enters the reactor in 2 to 5 steps, the reactor is subjected to the anaerobic / anoxic stage and the aerobic stage in turn according to the time sequence after water inlet, and sludge precipitation and one-step drainage are performed after the final step of water inlet and the subsequent anaerobic and anoxic stage as well as the subsequent aerobic stage are over. The method adopts the multi-step water inlet strategy to strength supply of denitrified carbon sources of organic substances of inlet water in a sequencing-batch reactor, improve the denitrifying efficiency, and avoid biological toxicity inhibition caused by accumulation of nitrate nitrogen and adverse effects of biological toxicity inhibition on sludge granulation. Moreover, due to multi-step water inlet, the rich variable frequency of substrates is increased and sludge aggregation is promoted. The granulated sludge cultured by the method is helpful for improving the settling property of the sludge of the reactor and creating advantages for improving the biological denitrogenation performance 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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IPC IPC(8): C02F3/30
Inventor 韩志英陈英旭石德智丁颖
Owner ZHEJIANG UNIV
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