A deep dehydration method for sludge-like substances based on thermal conditioning coupled with filter press

Abstract

The invention relates to a sludge substance deep dehydrating method based on thermal conditioning coupling filter pressing, belongs to the field of sludge treatment, is suitable for dehydration of various kinds of sludge, and particularly suitable for dehydration of surplus sludge. The method comprises the following steps: firstly carrying out heat exchange to a high temperature filtrate and the sludge, injecting the sludge with the raised temperature in a thermal conditioning processing unit, and performing a sufficient hydrothermal reaction at 120-250 DEG C; then immediately performing filter processing and dehydrating under the pressure to remove the moisture in a liquid state; at last, decompressing the high temperature sludge filter cake with pressure, further steaming and dehydrating with the sludge own high temperature and heat, so as to improve the dehydrating efficiency. The dehydrating method can improve sludge structure, physicochemical property and moisture distribution, save and fully utilize the heat, realize high-dryness and low-energy consumption dehydration of sludge, and improve the recycling value of the sludge.

Description

technical field [0001] The invention relates to a deep dehydration method for sludge-like substances based on thermal conditioning coupled with filter press, which is suitable for dehydration treatment of various types of sludge, especially for dehydration treatment of excess sludge, and belongs to the field of sludge treatment. Background technique [0002] In view of the implementation of the Environmental Protection Regulations of the People's Republic of China "Pollutant Discharge Standards for Urban Sewage Treatment Plants" (GB18918-2002), the amount of sewage treated by sewage treatment plants has increased year by year, resulting in an increase in the amount of excess sludge produced by sewage treatment plants year by year. , and the number is huge. According to the sewage discharge data in the Bulletin on the State of the Environment in my country, and considering the solid content rate of 0.015% in domestic sewage and the average treatment efficiency of urban sewage...

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Problems solved by technology

[0005] Both mechanical dehydration and thermal drying dehydration widely used at present have certain limitations. For example, mechanical dehydration is usually difficult to reduce the moisture content of sludge to below 75%, while thermal energy drying and dehydration consumes very high energy consumption, so it is very useful. It is necessary to find a high-efficiency and low-energy sludge dewatering method

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