A continuous sludge dewatering method based on hydrothermal treatment

Abstract

The invention relates to a continuous sludge dewatering method based on hydro-thermal treatment, and belongs to the field of sludge treatment. An external heat exchanger of a feeding unit is filled with high temperature filtrate, sludge is continuously introduced in the feeding unit, and the high temperature filtrate is used for preheating the sludge; the sludge after preheating enters a hydro-thermal treatment unit under the pushing of the feeding unit, and is heated to above 150 DEG C for a hydro-thermal reaction through a heating device arranged on the outside of the hydro-thermal treatment unit; the standing time of the sludge inside the hydro-thermal treatment unit is controlled by an accelerator arranged at the interior of the hydro-thermal treatment unit; partial sludge after hydro-thermal treatment is flown back to the hydro-thermal treatment unit; the sludge passing through the hydro-thermal treatment unit is introduced in a continuous extrusion dewatering unit to realize continuous dewatering of the hydro-thermal sludge, and a cavity in the dewatering process is at a sealed state. According to the dewatering method, based on the hydro-thermal treatment for improving the sludge structure and physicochemical characteristics, the energy sources are fully utilized and recycled while the energy consumption input is saved, and the sludge dewatering in a liquid form is realized continuously.

Description

technical field [0001] The invention relates to a continuous sludge dehydration method based on hydrothermal treatment, which is suitable for the dehydration treatment of various types of sludge, especially for the dehydration treatment of excess sludge, and belongs to the field of sludge treatment. Background technique [0002] Sludge is a semi-solid product with high water content, high organic matter content and high biological activity produced during the purification process of sewage and wastewater. Due to its huge output, high transportation costs, and difficulty in effective treatment and disposal, it has already had an impact on the sustainable operation of sewage treatment plants. At the same time, the microorganisms, heavy metals and other pollutants that are rich in it will cause serious secondary pollution to the environment and human health if not properly treated. Scientific research and practice have proved that dehydration can effectively solve the problem ...

AI Technical Summary

Problems solved by technology

The current sludge dehydration methods, such as mechanical dehydration, are difficult to reduce the moisture content of sludge to below 75%, and thermal drying and other methods have the disadvantage of high energy consumption. Therefore, it is necessary to develop a method that can effectively reduce sludge. It is imminent to meet the requirements of final treatment and disposal, and a deep dehydration method that requires less energy input

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