Quick starting system and method for producing methane through anaerobic digestion of sludge

Abstract

The invention discloses a quick starting system for producing methane through anaerobic digestion of sludge. The system includes a crusher, a mixing tank and an anaerobic reaction tank; the crusher is used for crushing water hyacinth, and an outlet of the crusher is connected to an inlet of the mixing tank through a pipeline; the mixing tank is provided with a dewatered sludge inlet and has a closed structure, and an outlet of the mixing tank is connected to the closed anaerobic reaction tank through a pipeline. The invention also provides a quick starting method for producing methane through anaerobic digestion of the sludge. The anaerobic digestion system is started by a way of adding a proper amount of high-C / N-ratio water hyacinth to the sludge, so that the system stability can be effectively guaranteed, and the starting period can be shortened; the anaerobic digestion system is started by a way of fixing the starting addition amount and gradually increasing the addition load, so that methanogens can be guaranteed to quickly adapt to the environment and an appropriate ratio of acid-forming bacteria to the methanogens is maintained. A high-performance grinding and crushing device is used for breaking the water hyacinth, and the mixing effect of the water hyacinth and the sludge is better.

Description

technical field [0001] The invention belongs to the field of solid waste recycling, and in particular relates to a rapid start-up system and method for anaerobic digestion of methane from sludge. Background technique [0002] A large amount of sludge will be produced in the process of urban sewage treatment. With the increase of urban sewage treatment volume and treatment rate, the output of sludge is getting bigger and bigger. The composition of sludge is complex, not only containing organic matter, but also containing pathogenic bacteria and heavy metals. If not handled properly, it will cause great harm to the environment and human health. Anaerobic sludge digestion can not only convert the organic matter in the sludge into high-calorie biogas, but also kill pathogenic bacteria and stabilize heavy metals, so it has become one of the sludge treatment methods widely used in the world. [0003] However, the anaerobic digestion of sludge has the problem of long start-up ti...

AI Technical Summary

Problems solved by technology

[0003] However, the anaerobic digestion of sludge has the problem of long start-up time

The scale of the anaerobic digestion reactor is large, ranging from a few thousand cubic meters to tens of thousands of cubic meters. If the inoculation mud is used for acclimation and start-up, the cost will be too high. If the inoculation mud is not used and the sludge is used for direct start-up, it will take a long time , start-up time can last 3-8 months or longer

The reason for the long time of direct start-up of sludge is that the methanogenic bacteria themselves are difficult to cultivate

There are few types of methanogens, most of which are archaea, which have strict requirements on the living environment and a long generation cycle, so it is difficult to cultivate and reproduce

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