Improved sequencing batch primary sludge fermentation coupling denitrification device and method

Abstract

The invention discloses an improved sequencing batch primary sludge fermentation coupling denitrification device and method, which belong to the technical field of treatment of municipal sewage and biochemical treatment of primary sludge. The device is provided with a water inlet tank, a sequencing batch sludge fermentation coupling denitrification reactor, a sludge storage pool and a water outlet tank; through improvement of the reactor and a control method, the releasing amount of ammonia nitrogen can be reduced in the fermentation process, the removal of the ammonia nitrogen in a sludge fermentation coupling denitrification device is intensified, and the target of increasing the removal rate of total nitrogen is achieved in the end. Aiming at the characteristics of primary sludge, process development and optimization are carried out, the improved sequencing batch primary sludge fermentation coupling denitrification device is suitable for C / N ratio municipal sewage and can save carbon sources and increase nitrogen removal efficiency. A micro-aerobic time-limited aeration method is innovatively adopted so that the release of the ammonia nitrogen is effectively controlled, the effect of intensified denitrification of the carbon sources in the sludge is increased, and the quality of discharged water is improved.

Description

technical field [0001] The invention relates to primary sludge and urban sewage and its treatment technology. The primary sludge produced by urban sewage plants is used as a substrate, and the volatile organic acids produced by its fermentation are used as electron supplies for denitrifying bacteria to reduce oxidized nitrogen. In the sequencing batch reaction device, the initial stabilization of primary sludge and the denitrification of urban sewage are realized, and the operation of the device is optimized and improved so that the carbon source produced during the fermentation process can meet the needs of urban sewage denitrification. Under the premise, the influence of fermentation by-products such as ammonia nitrogen and COD on the effluent water quality should be reduced as much as possible. The invention is applicable to the fields of primary sludge treatment and urban sewage treatment, and is also suitable for other low C / N ratio wastewater treatment. Background tech...

AI Technical Summary

Problems solved by technology

[0005] The traditional method of using sludge as a substrate to develop carbon sources has some limitations. For example, with the release of available carbon sources, pollutants such as ammonia nitrogen are also released from the sludge in large quantities, causing secondary pollution; The washing liquid is directly pumped into the anoxic zone of biological denitrification to provide carbon source for denitrifying bacteria, and the anoxic zone has no way to remove ammonia nitrogen, which ultimately affects the quality of effluent water

On the other hand, the dissolution of fermentation products, such as volatile fatty acids, etc., greatly increases the viscosity of the fermentation mixture, resulting in poor sludge dewatering performance and difficulties in sludge-water separation.

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