Mud-water separation type sludge anaerobic digestion treatment system and method

Abstract

The invention discloses a mud-water separation type sludge anaerobic digestion treatment system, which comprises a sludge anaerobic digestion tank, a drainage assembly and a cyclone for mud-water separation. The sludge anaerobic digestion tank is provided with a sludge inlet pipeline, a sludge circulation stirring assembly and a detection element. The cyclone is respectively connected with the drainage assembly and the sludge inlet pipeline. A mechanical stirring assembly and a biogas circulating stirring assembly are arranged in the sludge anaerobic digestion tank, the mechanical stirring assembly is arranged at the side part of a tank body, and the biogas circulating stirring assembly not only collects biogas in the tank, but also stirs sludge by using the biogas. The sludge circulating stirring assembly is used for realizing circulating stirring of sludge in the tank and discharging the sludge out of the tank. The detection element is used for detecting the liquid level, the temperature, the pressure, the viscosity and the potential of the sludge. The treatment system has the advantages of flexibility in disassembly and assembly, small occupied area, high space utilization rate and the like. The invention further discloses a sludge-water separation type sludge anaerobic digestion treatment method. The anaerobic digestion efficiency and dehydration performance of the sludge are improved, and the sludge volume is reduced.

Description

technical field [0001] The invention mainly relates to the technical field of environmental protection, in particular to a mud-water separation type sludge anaerobic digestion treatment system and method. Background technique [0002] Existing sludge centralized disposal projects generally adopt the sludge treatment process of "thermal hydrolysis + anaerobic digestion + dehydration + drying". Bacteria and anaerobic bacteria decompose biodegradable organic matter in sludge into CH 4 , CO 2 、H 2 O and H 2 S Digestion Technology. It can remove 30% to 50% of organic matter in waste and stabilize it. It is one of the common methods for sludge reduction and stabilization. It is the most common method for stabilizing organic sludge. It can deal with the content of organic matter. higher sludge. Anaerobic sludge digestion is especially suitable for sludge treatment in large-scale sewage treatment plants. After the organic matter is anaerobically decomposed, a large amount of b...

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Problems solved by technology

[0004] (1) The solid content of anaerobic digested sludge is low and the residence time is long, resulting in redundant volume of sludge anaerobic digester, occupying a large amount of engineering space

[0005] (2) The dehydration performance of sludge has been greatly improved after thermal hydrolysis, but after entering the anaerobic digestion system, the original sludge broken flocs and dissolved microbial cells are combined with anaerobic bacteria again, resulting in sludge The dehydration performance is not good, which reduces the treatment efficiency of the subsequent plate and frame filter press

[0006] (3) There is a dead angle in the stirring of the existing anaerobic digestion system, and the sludge is easily deposited at the bottom of the tank, which affects the stability of the sludge anaerobic digestion operation

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