Device and method for in-situ removal of ammonia nitrogen in anaerobic digestion system

Abstract

The invention provides an in-situ device for removing ammonia nitrogen in an anaerobic digestion system, which includes an ammonia removal anaerobic digestion tank and an ammonia absorption-circulation system, and the ammonia absorption-circulation system includes a separation membrane module, an acid An absorption liquid storage bottle and a peristaltic pump, the separation membrane assembly includes a separation membrane and a membrane protection layer arranged outside the separation membrane, the separation membrane assembly is arranged inside the anaerobic digestion tank for ammonia removal; The ammonia anaerobic digestion tank is used to hold the anaerobic digestion feed liquid. The device provided by the invention can realize the in-situ removal of ammonia nitrogen in the anaerobic digestion system, remove ammonia nitrogen while performing anaerobic digestion, reduce the inhibitory effect of ammonia nitrogen, and recover ammonia nitrogen.

Description

technical field [0001] The invention relates to the technical field of biomass energy recovery, in particular to a device and method for in-situ removal of ammonia nitrogen in an anaerobic digestion system. Background technique [0002] With the rapid development of my country's economy and society and the acceleration of urbanization, my country produces a large amount of biomass waste such as kitchen waste, municipal sludge, livestock and poultry manure, and crop straw every year. Anaerobic digestion technology can realize the harmless treatment and resource utilization of biomass waste, and is considered to be the most widely used and most promising biomass waste treatment technology. Traditional anaerobic digestion technology can achieve the degradation of organic matter and convert C into CH 4 The form of N is recovered as energy, but the N in the organic matter will accumulate in the reactor in the form of ammonia nitrogen and be discharged with the biogas slurry. Wh...

AI Technical Summary

Problems solved by technology

When dealing with biomass waste with high nitrogen content, such as kitchen waste, livestock and poultry manure, excessive ammonia nitrogen will have a strong inhibitory effect on the process of methane production, resulting in unstable system operation; at the same time, biogas slurry with high concentration of ammonia nitrogen and low The characteristics of the carbon-nitrogen ratio also increase the difficulty of its treatment

[0003] In the prior art, ammonia nitrogen removal is usually achieved by biological deamination method, ammonia nitrogen blow-off method or membrane contactor recovery method, but these three methods are all side-stream ammonia nitrogen removal methods, which cannot directly reduce the ammonia nitrogen concentration in the anaerobic reactor. And then remove the inhibitory effect of ammonia nitrogen on methanogens; and the process route is complicated, more equipment is required, and the investment cost is high

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