System for treating sludge by two-phase anaerobic digestion and method

Abstract

The invention relates to a system for treating sludge by two-phase anaerobic digestion, which comprises a metering and weighing unit, a slurrying and blending unit, a TSBP hydrolysis unit, a TSBP methanogenesis unit, a deep dehydration unit, a stacking unit, a chemical phosphorus removal unit, a biogas treatment unit, a biogas utilization and heat exchange unit, a heating and heat preservation unit and an odor treatment unit. The sludge enters the slurrying and blending unit through the metering and weighing unit for moisture content blending, then enters the TSBP hydrolysis unit firstly, is subjected to rapid wall breaking at a high temperature, degrades macromolecular organic matters into micromolecular organic acids, and then is conveyed to the TSBP methane production unit, and the volatile organic acids are converted into biogas in a medium-temperature environment. The biogas is subjected to desulfurization and moisture removal treatment and then is used for power generation, and power generation waste heat is used for heating and heat preservation of the hydrolysis unit and the methanogenesis unit; the digested sludge is subjected to deep dehydration and then is subjected to subsequent treatment and utilization; according to the invention, the sludge capacity can be realized, and the digested sludge and the biogas slurry are treated at the same time, so that the influenceon the environment is prevented.

Description

technical field [0001] The invention belongs to the technical field of solid waste treatment, relates to the harmless treatment and energy utilization of solid waste resources, and in particular to a system and method for two-phase anaerobic digestion treatment of sludge. Background technique [0002] In recent years, with the improvement of my country's urbanization development level, sewage treatment facilities have become increasingly perfect, and sludge production has also increased year by year. Anaerobic digestion process is currently the most feasible sludge stabilization process. After anaerobic digestion, the volume of sludge is greatly reduced, and the dehydration performance is greatly improved, which can realize the reduction and stabilization of sludge. At the same time, the clean energy biogas produced by anaerobic digestion of sludge can not only be used as boiler fuel and directly drive blowers, but also can be used for biogas power generation to provide part...

AI Technical Summary

Problems solved by technology

[0003] Although there have been some researches and applications on sludge anaerobic digestion in my country, due to many deficiencies in the design theory and operation of anaerobic digestion process, the application of sludge anaerobic digestion in my country is lagging behind.

There are mainly the following problems in anaerobic digestion of sludge: (1) The problem of sludge wall breaking: the cell wall structure is stable and difficult to biodegrade. It is necessary to solve the problem of cell wall breaking to ensure the effective degradation of sludge

(2) Low reaction efficiency: common digestion technology is difficult to achieve high-efficiency methanation, and it is necessary to solve the optimal environment of hydrolytic acidification bacteria and methanogens to achieve high-efficiency methanation

(3) The net energy output of the anaerobic system is low: the energy consumption of the system is much higher than the system capacity, and it is difficult to achieve energy self-sufficiency

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