A method and system for hydrothermal treatment of concentrated sludge

Abstract

The invention discloses a concentrated sludge hydrothermal treatment method and system, and relates to the technical field of environmental protection. The hydrothermal treatment method of concentrated sludge of the present invention comprises: collecting concentrated sludge, filtering after first-stage pre-heating by venting steam, and then performing hydrothermal reaction after secondary pre-heating as a cold source medium through heat exchange by a heat exchanger; After the hydrothermal treatment, the released hydrothermal steam is recovered as the first-level pre-heating heat source, and the recovered liquid material is used as the heat source medium after being cooled by the heat exchanger and then collected and processed. This system is used in conjunction with the method described above. The present invention carries out hydrothermal reaction after filtering concentrated sludge and secondary pre-heating, avoids pre-dehydration, and saves treatment procedures; fully utilizes the waste heat of high-temperature materials after hydrothermal reaction, saves energy, and improves hydrothermal reaction efficiency; especially applicable It is suitable for small-scale and concentrated sludge treatment; its system structure is simple, it occupies a small area, saves equipment and operating costs, and is especially suitable for small-scale sewage treatment enterprises with limited land use.

Description

technical field

[0001] The invention relates to the technical field of environmental protection, in particular to a hydrothermal treatment method and system for concentrated sludge. Background technique

[0002] With the continuous acceleration of our urbanization process, more and more urban pollutants are produced, and the harmless treatment of these pollutants has become an urgent problem to be solved. Municipal sludge has high water content and high organic matter content. Simple landfill, drying, incineration, land reuse and other treatment technologies are difficult to take into account the requirements of environmental protection, resource utilization and treatment costs, and are limited. Sludge anaerobic digestion gas production is considered to be the most promising sludge treatment technology and is widely promoted in my country, but practice shows that the digestion process directly using sludge as raw material has low gas production rate, long residence time, and...

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