Method for removing undigested matter in anaerobic digestive liquid and preparing organic liquid fertilizer base fluid

Abstract

The invention discloses a method for removing large-particle undigested and undecomposed organic matter and sand in anaerobic digestive liquid stage by stage and a method for preparing organic liquid fertilizer base fluid with the anaerobic digestive liquid without large-particle undigested and undecomposed organic matter and sand as the raw material.Plant fibers and other large-particle undigested and undecomposed organic matter separated after staged treatment, sand and other inorganic matter are used as initial raw materials of solid biogas manure or soil conditioner, and anaerobic digestive liquid biogas residues and biogas slurry which are obtained through staged treatment are used as initial raw materials of the organic liquid fertilizer base fluid.By means of the method, the plant fibers and other large-particle undigested and undecomposed organic matter, sand and other inorganic matter can be removed from the anaerobic digestive liquid, an organic liquid fertilizer base fluid product is prepared by means of the anaerobic digestive liquid with the large-particle undigested and undecomposed organic matter, sand and inorganic matter removed, and accordingly the bottleneck problem about resource reuse of the anaerobic digestive liquid is solved.

Description

technical field [0001] The invention relates to the field of resource recovery and utilization, in particular to a method for graded removal of large particles of undigested and decomposed organic matter and sediment in anaerobic digestion liquid and anaerobic digestion after removing large particles of undigested and decomposed organic matter and sediment A method for preparing organic liquid fertilizer base liquid with liquid as raw material. Background technique [0002] Biogas production by anaerobic fermentation is one of the important ways to effectively utilize biomass resources including livestock and poultry manure and crop straw to obtain biomass energy. At present, with the development of industrialized biogas, the effective utilization and reasonable consumption of anaerobic digestion by-products (biogas residue and biogas slurry mixture), which restricts the economic benefits of large-scale industrialized biogas projects, has become an issue that affects the sus...

AI Technical Summary

Problems solved by technology

[0003] 1. Anaerobic digestion liquid, a by-product of anaerobic fermentation, generally has the characteristics of large volume and low solid concentration, which has become a key problem that limits the application of anaerobic digestion liquid to fertilizer

[0004] 2. Stability of nutrients contained in anaerobic digestate (biogas slurry)

Although modern solid-liquid separation technology can alleviate the technical problems of solid-liquid separation of anaerobic digestion liquid, they cannot solve the technical problems of graded treatment and fine separation of anaerobic digestion liquid, and all have problems such as high energy consumption, short service life, and high operating costs. None of them can meet the production requirements of large-scale treatment and utilization of anaerobic digestate

Even the traditional bioengineering technology, such as high-temperature aerobic fermentation (composting) treatment technology, can only solve the problem of organic high-humidity solids (biogas residue), and a large amount of low-concentration separated water (biogas slurry) still exists. and digestion problems, still unable to meet the basic requirements of the application of anaerobic digestate fertilizer

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