Anaerobic digestion sludge treatment method and treatment system

Abstract

The invention discloses an anaerobic digestion sludge treatment method and treatment system. The treatment method comprises the following steps: anaerobic digestion sludge is divided into two parts, one part is subjected to alkalization treatment to obtain alkalized sludge, and the other part is subjected to acidification conditioning to obtain acidified sludge; and the alkalized sludge and the acidified sludge are mixed for dehydration treatment. The treatment system comprises at least two sets of alkalization devices, acidification devices and dehydration devices. According to the treatment method, through alkalization treatment and acidification conditioning of the anaerobic digestion sludge, the dehydration performance and physicochemical properties are improved, high-quality and low-cost dehydration of the anaerobic digestion sludge is achieved, and the treatment method has the advantages of being simple in process, convenient to operate, high in treatment efficiency, low in agent dosage, low in energy consumption, low in cost, good in dehydration effect, little in secondary pollution and the like; and the filtrate which is proper in temperature, slightly neutral in pH value and capable of meeting biochemical requirements in C / N ratio is obtained, subsequent treatment of the filtrate is facilitated, and the method has very good use value and very good application prospect.

Description

technical field [0001] The invention belongs to the technical field of sludge disposal, and relates to a treatment method and a treatment system for anaerobic digestion sludge. Background technique [0002] At present, the method of "sludge high-temperature thermal hydrolysis + high-temperature anaerobic digestion + dehydration + drying treatment" is usually used to realize the stabilization, reduction, recycling and harmless treatment of municipal sludge, which has been widely used. In the high-temperature anaerobic digestion process after high-temperature thermal hydrolysis treatment, the organic matter in the sludge is further utilized to generate considerable biogas resources, but while the organic matter in the sludge is digested, the ammonia nitrogen value of the biogas slurry will continue to increase in the system When the internal accumulation rises to a certain index, it can reach 1800-2000mg / L when the biogas slurry is discharged. After the biogas slurry is discha...

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Problems solved by technology

[0004] Sludge chemical conditioning and dehydration: use different chemical ratios, use the properties of the chemical itself or the compound reaction effect of the chemical to achieve sludge wall breaking or destabilization to improve dehydration performance, such as typical iron salt + PAM process, Fenton method, various Inorganic salt proportioning process, etc., the existing defects are: the addition of chemicals is too high, resulting in complex treatment of subsequent filtrate components; the space for improving dehydration performance is limited; too high requirements for reaction conditions affect stable operation; the stability of high-temperature anaerobic digested sludge cannot be achieved high-quality treatment goals

[0005] Sludge thermal drying and dehydration: use the principle of sludge thermal drying to evaporate water, so that the sludge can directly achieve the result of high dehydration rate, such as CN110040937A a heat pump low-temperature sludge drying system, CN211111658U sludge drying system, etc., but its There is the problem of excessive energy consumption in the thermal drying method

[0006] Sludge electrolytic dehydration: Using the principle of electroosmosis, the sludge is broken under the condition of strong electric field to improve the performance of sludge dehydration, such as patent CN207828092U, a double electroosmosis sludge dewatering sludge super-drying system, using multi-stage The electrolysis method has improved the dehydration performance of the sludge, but for the high-temperature anaerobic digestion sludge, the ammonia nitrogen itself has not been removed, and the press filter liquid still has the problem of carbon-nitrogen ratio imbalance

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