Method for efficient and energy-saving sludge treatment

Abstract

The invention discloses a method and device for efficient and energy-saving sludge treatment. The method of sludge treatment comprises the steps: the sludge first enters the preheating unit, and afterpreheating to 60 degrees or more, directly enters the thermal hydrolysis unit, and the high temperature pressurized steam generated after the end of the thermal hydrolysis is returned to the preheating unit to preheat the sludge. The device is a thermal hydrolysis device, including a mounting seat, a tank body, an air inlet pipe, an air guiding pipe, a nozzle, a sieve cylinder, a card slot, a loading bin, a motor, an exhaust pipe, a multi-stage electric push rod, a shaft rod, a connecting rod , block, rotating rod, mixing blade, discharge tube, brush and filter net. The method and the deviceaccelerate the speed of thermal hydrolysis, can make the steam and sludge mixing effect better, and also save the cost, greatly improve the work efficiency, reduce the work intensity of the staff, andalso enhance the work. Practicality.

Description

Technical field [0001] The invention belongs to the technical field of sludge treatment application, and relates to a sludge treatment method and device, in particular to a high-efficiency and energy-saving sludge treatment method and device. Background technique [0002] At present, the dry weight of sludge processed by my country's sewage treatment plants is about 1.4 million tons per year, and the annual growth rate is more than 10%; moreover, the sludge contains a lot of heavy metals, pathogens and other harmful substances, which are harmful to the environment; It can be seen that the environmental pollution caused by sludge is becoming more and more prominent, causing greater safety hazards, environmental hazards and economic burdens to the society. The thermal hydrolysis digestion process is a way to reduce, recycle, and stabilize sludge. And safe processing technology. [0003] Existing sludge equipment often mixes a certain amount of sludge into a thermal hydrolysis tank, an...

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Problems solved by technology

[0002] At present, the dry weight of sludge treated by sewage treatment plants in my country is about 1.4 million tons per year, and it is increasing at a rate of more than 10% every year; moreover, sludge contains a large amount of harmful substances such as heavy metals and pathogenic bacteria, which is harmful to the environment; It can be seen that the problem of environmental pollution caused by sludge is becoming more and more prominent, which has caused great safety hazards, environmental hazards and economic burdens for the society. The thermal hydrolysis digestion process is a method to reduce, recycle and stabilize sludge. and secure processing technology

[0003] Existing sludge plants often put a certain amount of sludge into the thermal hydrolysis tank after mixing, and keep it under high temperature and high pressure for a certain period of time, so that the sludge thermal hydrolysis is completed, and then the sludge is discharged and transported To the next treatment link, in this way, the mixing efficiency of steam and sludge is slow, the treatment time is long, the energy consumption is high, and the energy utilization rate is low; the land occupation is large, the investment is high; the operation and maintenance cost is high; the moisture content of the mechanically dewatered cake It can only reach about 60%; thereby increasing the cost of thermal hydrolysis, and it is cumbersome to clean up after the treatment is completed, which greatly increases the work intensity of the staff

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