Three-stage sludge dewatering and drying system and method in domestic sewage treatment plant

Abstract

The invention discloses a three-stage sludge dewatering and drying system and a method in a domestic sewage treatment plant. The system comprises: a short-time concentration tank, a dilute sludge conveying equipment, a high-pressure belt type machine conditioning tank, a high-pressure belt type dehydrator, a sludge cake conveying equipment, a heat recovery type hot air drying machine subsystem, aheat recovery type dry sludge conveying subsystem, a dry sludge bin, a high-pressure belt type machine flocculant dosing device, a high-pressure belt type machine coagulant aid dosing device, a hot air drying condensate water tank and a recycling pump. The system can be used for continuously dehydrating and drying residual sludge in a domestic sewage treatment plant, the three sections are respectively short-time concentration tank concentration, high-pressure belt type machine dehydration and hot air drying, and the sludge is dried until the water content is below 40%. The system is small inoccupied area and can be conveniently connected with a domestic sewage treatment plant, heat can be recycled in the drying process, and energy consumption and cost are effectively reduced.

Description

technical field [0001] The invention relates to the field of deep dehydration and drying in sludge treatment, in particular to a three-stage sludge dehydration and drying system and method in a domestic sewage treatment plant. Background technique [0002] At present, various water contents of sludge produced by domestic sewage treatment plants coexist. According to the requirements of GB18918-2002 "Pollutant Discharge Standards for Urban Wastewater Treatment Plants", sludge from urban sewage treatment plants should be dehydrated. After dehydration, the moisture content of sludge It should be less than 80%; according to the requirements of GB16889-2008 "Pollution Control Standards for Domestic Waste Landfill Sites", solid residues after biological treatment such as anaerobic biogas production, solid residues after feces treatment, and sludge from domestic sewage treatment plants After treatment, the moisture content is less than 60%, and it can be disposed of in domestic was...

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Problems solved by technology

[0005] Based on the problems existing in the prior art, the purpose of the present invention is to provide a three-stage sludge dehydration and drying system and method in a domestic sewage treatment plant, which can solve the problems existing in the existing sludge drying system, which are not easily related to life. Sewage treatment plants are directly connected and there is no energy recovery and other issues

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