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A kind of sludge side flow treatment device and method based on nitrite enhanced sludge fermentation

A nitrite and flow treatment technology, applied in the field of urban sewage treatment and resource utilization, can solve problems such as fluctuation of influent water quality

Active Publication Date: 2022-03-29
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a real-time control device and method for stable denitrification of AAO sludge side reflux system (4), to solve the problem of water quality fluctuations in the process of urban sewage treatment

Method used

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  • A kind of sludge side flow treatment device and method based on nitrite enhanced sludge fermentation

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The raw water inflow is monitored by the PLC control system (35) and the C / N ratio is 3.6. The raw water is treated by the AAO continuous flow reactor (2) and then enters the sedimentation tank (3). The remaining sludge in the rear sedimentation tank (3) passes through the sludge After the concentration of the mud side reflux system (4) removes 40% of the water, it enters the sludge digestion tank (14) for digestion. The digestion time is 1 day, and at the same time, it passes through the nitrite solution storage tank (13) to the sludge digestion tank. In (14), nitrite solution is added continuously, and the temperature of the digestion tank is 30°C. After the digestion is completed, the digested sludge rich in organic matter is returned to the anoxic zone Ⅰ (7) to supplement carbon sources and promote denitrification and denitrification effect.

Embodiment 2

[0019] The raw water inflow is monitored by the PLC control system (35) and the C / N ratio is 7.8. The raw water is treated by the AAO continuous flow reactor (2) and then enters the sedimentation tank (3). The remaining sludge in the rear sedimentation tank (3) passes through the sludge After the concentration of the mud side reflux system (4) removes 30% of the water, it enters the sludge digestion tank (14) for digestion, and the digestion time is 5 days. At the same time, it passes through the nitrite solution storage tank (13) to the sludge digestion tank In (14), nitrite solution is continuously added, and the temperature of the digestion tank is 30°C. After the digestion is completed, the sludge is relatively stable in nature, and is returned to the anaerobic zone I (7), thereby supplementing the activated sludge concentration in the anaerobic zone.

Embodiment 3

[0021] The raw water inflow is monitored by the PLC control system (35) and the C / N ratio is 12.5. The raw water is treated by the AAO continuous flow reactor (2) and then enters the sedimentation tank (3). The remaining sludge in the rear sedimentation tank (3) passes through the sludge After the concentration of the mud side reflux system (4) removes 50% of the water, it enters the sludge digestion tank (14) for digestion, and the digestion time is 10 days. At the same time, the nitrite solution storage tank (13) feeds the sludge digestion tank In (14), nitrite solution is continuously added, the temperature of the digestion tank is 35°C, the sludge after digestion is significantly reduced, and its properties are stable. While supplementing the sludge concentration, the effect of in-situ sludge reduction is enhanced.

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Abstract

A sludge side flow treatment device and method based on nitrite enhanced sludge fermentation is used in urban sewage treatment systems to enhance system denitrification and in-situ sludge reduction. Part of the concentrated sludge in the secondary sedimentation tank enters the anaerobic zone through the return system, and the other part is treated by the sludge side treatment system and then returns to the appropriate area of ​​the sewage treatment system. At the same time, it is equipped with a programmable logic controller (PLC control system). By monitoring the concentration of COD and ammonia nitrogen in the influent, it controls the sludge fermentation time and the sludge return position of the sludge side return system, and accurately regulates the return method of the remaining sludge. Reduce the impact of influent water quality fluctuations on the sewage treatment system, and improve the efficiency of nitrogen and phosphorus removal in sewage. The toxic effect of nitrite can strengthen the lysis of microbial cells, and further hydrolyze and acidify the excess sludge to produce volatile fatty acids, which are returned to the anoxic zone to strengthen denitrification. The device method can save carbon sources, has considerable economic benefits, and reduces the cost of subsequent sludge disposal.

Description

technical field [0001] The invention relates to a sludge side flow treatment device and method based on nitrite enhanced sludge fermentation, belonging to the field of urban sewage treatment and resource utilization. Background technique [0002] In the process of urban sewage treatment, a lot of excess sludge will be produced, and the sludge contains a lot of organic matter. If it is directly discharged into the environment, it will cause secondary pollution to the environment. Therefore, anaerobic digestion is generally used. mud for further processing. That is, under anaerobic conditions, the organic pollutants in the activated sludge are degraded with the help of facultative bacteria and obligate anaerobic bacteria, and the main product of the decomposition is methane-based biogas. The process of digestion and degradation of organic matter under anaerobic conditions can be divided into two main stages, namely the acidic fermentation stage and the alkaline fermentation s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/14C02F101/30
CPCC02F3/302C02F2001/007C02F2101/30
Inventor 张亮常海彬孟庆贺于静仪宋培圆
Owner BEIJING UNIV OF TECH