A kind of endogenous FNA pretreatment sludge reduction and resource recovery process

Abstract

The invention discloses an endogenous FNA pretreatment and sludge reduction and recycling process. The process includes the following processes: 1) adding sludge into a pretreatment unit, and pretreating the sludge with FNA; 2) allowing the pretreated sludge to enter an acidogenic phase reactor, and carrying out hydrolysis acidification; and 3) allowing the sludge after hydrolysis acidification to enter a methanogenic phase reactor, and carrying out methanogenic digestion, and then discharging, wherein the FNA is synthesized by acidogenic phase and methanogenic phase digestion liquids. The sludge pretreated by the FNA firstly enters an acidogenic phase and is utilized to produce an acid by acidogenic fermentation bacteria, and the hydrolysis acidification rate is improved; then, the hydrolysis-acidified sludge enters a methanogenic phase and is utilized by methanogenic bacteria to increase the methane yield; and finally the digested sludge is discharged by the methanogenic phase, and the sludge reduction and recycling are realized.

Description

technical field [0001] The invention relates to a process for reducing and recycling endogenous FNA pretreatment sludge. Background technique [0002] At present, the safe disposal and recycling technology of sewage sludge is far behind the development of sewage treatment technology, and has become a major environmental problem that needs to be solved urgently in our country. Sludge treatment costs account for approximately half of the total cost of wastewater treatment, and sludge disposal and management is one of the major challenges facing the global water industry. According to the survey, since 2007, the annual growth rate of national sludge production is about 13%, and as of 2013, the amount of dry solids in sludge has reached 6.25 million tons per year. At present, about 80% of the sludge in urban sewage treatment plants with a processing capacity of 200,000 t / d or more has not been properly treated, and there is no certain guarantee for the outlet of these sludge, r...

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Problems solved by technology

In addition, in the above-mentioned method of producing FNA with anaerobic digestion solution, the nitrosation process of AOB oxidized ammonia nitrogen needs to control the molar ratio of bicarbonate and ammonia nitrogen by adding alkali from an external source; in addition, the NO 2 - The reaction of protonation to generate FNA also requires external source of acid, both of which will increase the cost of biochemical synthesis of FNA

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