Accelerator for accelerating anaerobic digestion of excess sludge, preparation method and application thereof

Abstract

The invention discloses an accelerant for accelerating anaerobic digestion of excess sludge as well as a preparation method and application thereof, and belongs to the field of solid waste reclamation. According to the accelerant as well as a preparation method and application thereof, the problems that in existing iron treatment excess sludge, pretreatment needs to be enhanced, the iron dissolution rate is low, the efficiency is low, and the sludge reduction and reclamation degree is low can be solved, the excess sludge is used as a raw material, a series of steps are carried out so as to obtain sludge activated carbon which is highly activated, then the sludge activated carbon, iron powder, common activated carbon and a binder are mixed according to a specific ratio and are pressed intoballs, sintering is carried out, then sodium ethylene diamine tetracetate is added, pressing forming is carried out, and drying is carried out so as to obtain the accelerant for accelerating anaerobicdigestion of the excess sludge; and an iron-carbon micro-electrolysis principle is utilized, the dissolution of iron is accelerated, due to the existence of ethylene diamine tetraacetic acid and Mn,the pH range of the accelerant in the sludge treatment is widened, the pH of the sludge does not need to be adjusted, the sludge can be treated by directly using the accelerant obtained through the method, and the cost is lowered.

Description

Technical field [0001] The invention belongs to the field of solid waste resource utilization, and specifically relates to an accelerator for accelerating anaerobic digestion of excess sludge, and a preparation method and application. Background technique [0002] With the continuous improvement of the level of urbanization in my country, the development of sewage treatment technology has been informed. According to statistics, 3,501 urban sewage treatment plants have been built across the country, with a sewage treatment capacity of 147 million m3 / day (a kind of increase in excess activated sludge Oxygen elimination supplement). With the continuous improvement of processing capacity and throughput, the accompanying problem is a substantial increase in the amount of remaining sludge. According to statistics, my country produces more than 30 million tons of sludge every year (calculated with a moisture content of 80%). The sludge contains a large amount of organic matter, bacteri...

AI Technical Summary

Problems solved by technology

[0008] In view of the existing iron treatment process of excess sludge, the dissolution rate of iron is slow and the efficiency is low. At the same time, it needs to be combined with enhanced pretreatment to achieve better digestion effect. Iron cannot be reused, the amount of methane produced is small, and sludge reduction and Due to the low degree of resource utilization and narrow application range, the present invention provides an accelerator for accelerating the anaerobic digestion of excess sludge and its preparation method and application