A method for cultivating and operating continuous flow aerobic granular sludge for treating domestic sewage at room temperature

Abstract

The invention discloses a culture operation method of continuous-flow aerobic granular sludge for treating domestic sewage at a normal temperature. The culture operation method has the characteristicsthat firstly an aerobic granular sludge process is rapidly started by ordinary flocculent sludge in a sewage treatment plant for a SBR (Sequencing Batch Reactor) operation mode, promoting granule formation by gradually shortening the hungry time in a satiety-starvation period, the mode is converted into a continuous-flow mode for operation after the operation is stable, and the removal of nitrogen and phosphorus in the domestic sewage at the normal temperature is realized; a device has the characteristics that the conversion between the SBR operation mode and the continuous-flow mode can be realized, the operation is simple and fast, and the granular-sludge culture speed is faster than single continuous-flow operation; in addition, since a reactor does not need to be disassembled additionally when the operation mode is converted, the loss of the granular sludge can be reduced and the high sludge concentration can be maintained; when the property of the aerobic granular sludge under the continuous flow is deteriorated, the device can return the SBR operation mode to carry out rapid restoration on the property of the granular sludge.

Description

Technical field: [0001] The invention is applicable to the field of sewage biological treatment, and is especially suitable for starting a continuous flow aerobic granular sludge process, synchronous denitrification and phosphorus removal of urban domestic sewage at normal temperature and recovery of granular sludge performance. Background technique: [0002] Aerobic granular sludge is a biological aggregate with compact structure, good sedimentation performance, and high degree of microbial diversity; due to the layered growth of microorganisms in aerobic granular sludge, aerobic and anoxic can exist simultaneously under aerobic conditions. , anaerobic microenvironment, has many advantages that cannot be compared with traditional activated sludge such as simultaneous denitrification and phosphorus removal under aerobic conditions, and is considered to be a promising wastewater biological treatment technology; aerobic granules that operate in a continuous flow mode The sludg...

AI Technical Summary

Problems solved by technology

[0002] Aerobic granular sludge is a biological aggregate with compact structure, good sedimentation performance, and high degree of microbial diversity; due to the layered growth of microorganisms in aerobic granular sludge, aerobic and anoxic can exist simultaneously under aerobic conditions. , anaerobic microenvironment, has many advantages that cannot be compared with traditional activated sludge such as simultaneous denitrification and phosphorus removal under aerobic conditions, and is considered to be a promising wastewater biological treatment technology; aerobic granules that operate in a continuous flow mode The sludge process has the advantages of simple operation control, high volume load, and space saving. However, the continuous flow operation lacks the sedimentation process, the biological selective pressure effect is not obvious, and there is no satiation and hunger process. Therefore, it is difficult to screen granular sludge with good sedimentation performance. , it is difficult for the sludge to form particles in it during the start-up period, and it is easy to affect the settling performance of the granular sludge during the operation process, and the sludge concentration is often not high in the continuous flow, and the denitrification and phosphorus removal performance is easy to deteriorate and not easy to recover. There is no SBR The aerobic granular sludge is started quickly; and it is generally believed that the sedimentation zone is very important for continuous flow reactors, and the method of converting the reactor operation mode by adding a sedimentation zone is cumbersome, which will increase the floor space and the process of transforming the reactor can also adversely affect the performance of granular sludge

At present, when the continuous flow aerobic granular sludge process is started, the existing process needs to be inoculated with mature aerobic sludge particles, or the carbon, nitrogen and phosphorus ratio is adjusted to start. The actual application range is narrow, and the granular sludge cannot be recovered after disintegration. The above-mentioned process that can quickly start the aerobic granular sludge and the device that can convert the SBR reactor and the continuous flow reactor without major modification are rarely reported.

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