Sludge pyrohydrolysis system and method

Abstract

The invention discloses a thermal hydrolysis system and method for sludge. The thermal hydrolysis system for sludge comprises: a mixing unit; the mixing unit is used to mix lye and sludge to form a mixed material; a thermal hydrolysis unit; The thermal hydrolysis unit is used for hydrolyzing the mixed material at a predetermined temperature. The sludge thermal hydrolysis system and method of the present invention do not require excessively high pyrolysis temperature when thermally hydrolyzing sludge, can avoid the "Maillard reaction", are not easy to produce "melanoids" that are difficult to degrade, and improve production efficiency. biogas effect, and facilitate subsequent sludge treatment.

Description

technical field [0001] The invention relates to the field of sludge treatment, in particular to a sludge thermal hydrolysis system and method. Background technique [0002] Because sludge contains some difficult-to-decompose substances, such as: hydrocolloid substances or extracellular polymeric substances, these substances are mainly composed of polysaccharide substances and proteins. Through thermal hydrolysis, the cell wall in the sludge can be broken, and the extracellular polymer can be hydrolyzed to improve the biodegradable performance and the degradation rate of organic matter, and realize the sanitation of the sludge while increasing the biogas production and improving the dewatering performance of the sludge. deal with. [0003] Existing sludge thermal hydrolysis technology usually adopts high temperature (155-170°C), high-pressure steam to cook sludge and instantaneous pressure relief steam explosion flash process. The problems and effects of this method are as ...

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Problems solved by technology

[0004] 1. Due to the operation under high temperature and high pressure conditions, there are not only safety risks, but also the problem of bottom sticking and capping is prone to occur in the reactor

[0005] 2. When sludge is hydrolyzed under high temperature conditions, it may produce "Maillard reaction" and produce "melanoids" that are difficult to degrade, which not only affects biogas production, but also brings difficulties to subsequent sewage treatment

[0006] 3. A heat source that requires a high temperature

[0007] 4. The temperature of the hydrolyzed sludge is high, and it needs to be cooled and cooled before it can enter the subsequent treatment device, which leads to a large waste of energy

[0008] 5. High concentration of exhaust gas and large output

[0009] 6. High requirements for operating personnel, heavy daily maintenance workload

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