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Advanced treatment method after anaerobic digestion of excess sludge in urban sewage treatment plant

A technology of excess sludge and advanced treatment, which is applied in the field of urban sewage treatment and resource utilization, can solve the problems of long fermentation time and low fermentation efficiency, reduce the content of volatile organic compounds, increase stability, and reduce sludge obvious effect

Active Publication Date: 2019-07-12
BEIJING UNIV OF TECH
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Problems solved by technology

However, there are advantages and disadvantages. Although anaerobic digestion technology has brought some advantages, problems such as long fermentation time and low fermentation efficiency will inevitably occur.

Method used

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  • Advanced treatment method after anaerobic digestion of excess sludge in urban sewage treatment plant
  • Advanced treatment method after anaerobic digestion of excess sludge in urban sewage treatment plant
  • Advanced treatment method after anaerobic digestion of excess sludge in urban sewage treatment plant

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Embodiment Construction

[0015] Examples see figure 1 , the concrete flow process of the present invention is: at first the excess sludge produced in the operation process of the urban sewage treatment plant is stored in the excess sludge storage tank (1), and the excess sludge enters the sludge anaerobic digestion tank (2) for a period of about 20 days of anaerobic digestion. The digested sludge is dehydrated, and the ammonia nitrogen concentration in the dehydration liquid is 1600-1900mg / L, which is traditional high ammonia nitrogen wastewater, which is conducive to the realization of short-range nitrification in the anammox Anammox biofilm incubator (4). The digested sludge after mud-water separation enters the digested sludge storage tank (11), and the sludge concentration is 50000-60000 mg / L at this time. The dehydration liquid enters the flocculation sedimentation tank (9) for further mud-water separation, and the separated supernatant enters the Anammox biofilm incubator (4) the flocculated sl...

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Abstract

An advanced treatment method after anaerobic digestion of excess sludge in an urban sewage treatment plant is applied to the enhancement of the advanced treatment of excess sludge. Nitrite is added topromote the reduction and stability of the digested sludge, and an anaerobic ammoxidation biofilm is used to in situ remove ammonia nitrogen released in the sludge degradation process. The excess sludge treated with the method has a low volatile suspended solid concentration, and is stable, the sludge obtained after the advanced treatment is odorless, and the subsequent treatment is safe and convenient. In addition, a sludge dehydration solution has a low ammonia nitrogen concentration, and can directly return to the front treatment unit of the municipal sewage treatment plant, so the impactload on the urban sewage treatment plant is reduced. The method for treating the digested sludge has the advantages of high treatment efficiency, low byproduct ammonia nitrogen concentration, and realization of high stability of the treated sludge, and is an efficient and economical sludge advanced treatment method.

Description

technical field [0001] The invention relates to a method for intensifying treatment of excess sludge by coupling exogenous nitrite with anaerobic ammonium oxidation process, and belongs to the field of urban sewage treatment and resource utilization. Background technique [0002] With the development of my country's economy, the amount of excess sludge produced by urban sewage treatment plants is increasing year by year. According to statistics, the annual output of urban sludge in my country has reached 30 million tons (based on 80% water content), 80% of which have not been properly treated. At present, anaerobic digestion technology has been widely used because it can realize the reduction of sludge while recovering energy. However, there are advantages and disadvantages. Although anaerobic digestion technology has brought some advantages, problems such as long fermentation time and low fermentation efficiency will inevitably occur. And a large amount of digested sludge...

Claims

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Application Information

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IPC IPC(8): C02F9/14
CPCC02F1/52C02F3/2813C02F9/00C02F2001/007C02F2209/005C02F2209/06
Inventor 张亮孟庆贺常海彬于静仪宋培圆
Owner BEIJING UNIV OF TECH
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