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Method for processing excess sludge of town sewage plant using angleworm bio-filter

A biofilter and excess sludge technology, applied in the direction of biological sludge treatment, etc., can solve the problems of no reports, etc., and achieve the effects of low equipment investment and operating costs, simple process flow, high energy conversion rate and resource utilization rate

Inactive Publication Date: 2009-01-21
TONGJI UNIV
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Problems solved by technology

However, there is no report that this technology can treat the residual sludge of urban sewage plants

Method used

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  • Method for processing excess sludge of town sewage plant using angleworm bio-filter

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Embodiment Construction

[0024] see figure 1 .

[0025] The first step is sludge pretreatment. The residual sludge of a sewage plant in Shanghai was analyzed. It was determined that the suspended solid concentration SS of the residual sludge was 5000mg / L, and the volatile suspended solid concentration VSS concentration was 3500mg / L. Add water according to the filter treatment load to dilute the suspended solids concentration SS to 1000mg / L concentration. Because there is a limit concentration in the filter, an excessively high sludge suspended solids concentration SS may lead to blockage of the filter.

[0026] The second step is to build a biofilter and inoculate earthworms. The earthworm biological filter (EBF) adopts an open cylindrical filter, which can form natural ventilation. The diameter of the filter is φ=0.3m, the total height is 1.6m, and the top 10cm is the water distribution area. There is a traditional water distributor in the water distribution area for continuous water distributio...

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Abstract

A method for the treatment of excess sludge in an urban sewage plant by means of an earthworm bio filter relates to a method for the treatment of excess sludge in an urban sewage plant. The method comprises the following steps: firstly, SS contained in the excess sludge is controlled at 1000mg / L; then, an earthworm bio filter is set up, and earthworm is introduced; porcelain granules with the grain size of between 10 and 13 millimeters and between 6 and 9 millimeters are packed in an upper layer and a lower layer inside the bio filter; meanwhile, Eisenia foetida is evenly introduced into the porcelain granules according to the volume density of 1.13X10<5> per cubic metre of filter material; a bottom plate of the bio filter is provided with evenly distributed holes; sludge flows by successfully domesticated earthworms among the porcelain granules from a water distributor arranged on the top end of the bio filter; under the action of enzyme systems such as abundant protease of the earthworms, organic substances in the sludge are decomposed into nutritive materials of the earthworms and other microorganisms; the nutritive materials flow into a sedimentation tank from the holes on the bottom of the bio filter; and finally, a soil conditioner, which coexists with earthworm feces, has strong manurial effect and is obtained after dewatering, is obtained. The method has the advantages of simple process, convenient management, no secondary pollution, low cost and operating cost and excellent sludge reduction and stabilization effects, and can be widely used in the treatment of the excess sludge in the urban sewage plant.

Description

technical field [0001] The invention discloses a method for treating excess sludge in urban sewage plants by utilizing an earthworm biofilter, relating to a treatment method for excess sludge in urban sewage plants. Specifically, earthworm biofilters are used to treat residual sludge from urban sewage plants. Background technique [0002] At present, the sludge anaerobic digestion process and the sludge aerobic digestion process are generally used in the treatment of excess sludge in urban sewage plants at home and abroad. Among them, the sludge anaerobic digestion process relies on various facultative and obligate anaerobic bacteria to degrade organic pollutants under anaerobic conditions. The main products of degradation are methane, carbon dioxide and water. The advantage is that the anaerobic digestion of sludge can achieve a high degree of stability. In addition, since the digestion process does not require oxygen, it consumes less energy than aerobic digestion, and at...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/02
Inventor 杨健陆雍森陆志波赵丽敏易当皓邓德汉
Owner TONGJI UNIV
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