Device for promoting sludge digestion by ozone

Abstract

The invention discloses a device for promoting sludge digestion by ozone. The device comprises a pretreatment tank, a biological reaction tank and a chemical reaction tank. Excess sludge is pre-treated with ozone in the pretreatment tank, and the ozone oxidation treatment efficiency is improved by utilizing a heating device, a first throat pipe section, a second throat pipe section, a stirring and cutting mechanism and the like. Long-time anaerobic digestion is carried out in the biological reaction tank, and the anaerobic digestion efficiency and yield of sludge microorganisms are effectively improved by utilizing an iron cage structure, activated carbon, an antibiotic solution and the like. In the chemical reaction tank, an iron screen mesh electrode is used for performing electrolysis, and a plurality of filler layers are arranged between the electrodes, so that a new reaction area is constructed on the surface of a lower biochar layer, and organic matters are deeply degraded. The device can effectively improve the sludge anaerobic digestion efficiency and the ozone utilization rate, shorten the sludge digestion treatment time, and enable the treated sludge to reach the discharge standard, thereby realizing the economical and effective treatment of the sludge.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, in particular to an ozone-promoted sludge digestion device. Background technique [0002] Excess sludge is a by-product of urban domestic sewage treatment, mainly composed of organic matter, bacteria, inorganic particles, colloids, etc., with a high water content (above 95%). The output of excess sludge is large and contains a large amount of harmful substances. The generation of a large amount of excess sludge is an important problem faced by the activated sludge process. If the excess sludge is not effectively treated and disposed of, it will cause secondary pollution, directly or indirectly threaten environmental safety and public health, and at the same time greatly reduce the environmental benefits of sewage treatment facilities. Therefore, the excess sludge must be properly treated or disposed of. [0003] Anaerobic digestion technology is a relatively common way to deal with exce...

AI Technical Summary

Problems solved by technology

[0004] The anaerobic digestion process mainly includes four stages: hydrolysis, acidification, acetic acid production and methane production. In the hydrolysis process, most of the nutrients required by anaerobic microorganisms exist in the sludge flocs and the internal protoplasm of the microbial cell membrane (wall). , the extracellular secreted enzymes cannot fully and effectively contact the nutrient matrix, resulting in a very low hydrolysis efficiency of complex organic matter in the sludge, which severely limits the rate of anaerobic digestion

Therefore, the digestion efficiency of traditional anaerobic digestion technology is not high, not only the digestion process takes a long time, but also the sludge discharge is still not up to standard after digestion.

Images