Biogas slurry multistage-fermentation and multistage-filtering purification system

Abstract

The invention discloses a biogas slurry multistage-fermentation and multistage-filtering purification system, which comprises a multistage-fermentation system and a multistage-filtering purification system, wherein the multistage-fermentation system is communicated with the multistage-filtering purification system; the multistage-fermentation system comprises at least three fermentation pool units; the three fermentation pool units are sequentially communicated through a flow guide pipe; the multistage-filtering purification system comprises at least three filtering pool units; the three filtering pool units are sequentially communicated through a filtering pipe; the first fermentation pool unit is connected with a feeding opening; the third filtering pool unit is connected with a water discharge pipe. The biogas slurry multistage-fermentation and multistage-filtering purification system has the advantages that large-batch factory production is convenient; great convenience is brought for transportation and installation; in addition, the whole system is buried under the ground; plants can be planted in gaps above and beside pools; a large number of land resources are saved; independent maintenance can be realized; during maintenance, the operation of other units of the system cannot be influenced; the production of biogas low-carbon biological energy sources is greatly improved; the water pollution is effectively treated.

Description

technical field [0001] The invention relates to the technical fields of biogas fermentation engineering and sewage treatment engineering, in particular to a biogas slurry multi-stage fermentation multi-stage filtration and purification system. Background technique [0002] Existing various types of biogas digesters, whether they are small household biogas digesters or large and medium-sized biogas digesters, all adopt single-stage fermentation, that is, complete fermentation, biogas production and liquid discharge in the same biogas digester. The biogas slurry formed during the gas production process is also directly discharged after primary fermentation. Due to the complex composition of the biogas slurry formed during the gas production process, especially the use of urban organic waste and kitchen waste to produce biogas, only single-stage fermentation, all the biogas slurry Containing a large amount of organic matter cannot achieve maximum anaerobic and oxygen exposure p...

AI Technical Summary

Problems solved by technology

The biogas slurry formed during the gas production process is also directly discharged after primary fermentation. Due to the complex composition of the biogas slurry formed during the gas production process, especially the use of urban organic waste and kitchen waste to produce biogas, only single-stage fermentation, all the biogas slurry Containing a large amount of organic matter cannot achieve maximum anaerobic and oxygen exposure purification. The color and turbidity of the liquid are high, and the liquid is often brown and high turbidity. If it is discharged directly, it is easy to cause environmental pollution, and according to In the existing technology, the cost of building the pond is high, and the treatment of the biogas slurry is mostly through the addition of chemical additives such as flocculants for advanced treatment. The operating cost and management are difficult, and a large amount of chemical additives are used, which causes certain harm to the environment.

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