Method for preparing multifunctional organic fertilizer from biogas slurry

Abstract

The invention discloses a method for preparing a multifunctional organic fertilizer from biogas slurry. The method comprises the following steps: (1) solid-liquid separation: carrying out primary solid-liquid separation on a biogas residue and biogas slurry mixture generated by a biogas station by an in-station solid-liquid separator to separate the biogas residue from the biogas slurry; (2) pre-fermenting; (3) settling and filtering; (4) secondary fermentation; (5) flocculation; (6) ultrafine filtration: when the foliar fertilizer is produced, tiny particles in the liquid need to be further removed so that the particle size of the liquid is less than or equal to 0.1 mm to reach a water-soluble state, and a spray head is prevented from being blocked during application; (7) complexing; (8)composite coordination; (9) filling. The biogas residues and biogas slurry are used for producing organic fertilizer for organic cultivation so that the application amount of chemical fertilizer is reduced, and planting, cultivation and energy utilization run on a virtuous cycle track of energy, ecology and environmental protection.

Description

Technical field [0001] The invention relates to the field of preparing organic fertilizer from biogas slurry, in particular to a method for preparing multifunctional organic fertilizer from biogas slurry. Background technique [0002] In the field of environmental protection technology, in the anaerobic fermentation process for kitchen waste and manure, in addition to generating biogas for use by gas users, a large amount of biogas liquid is also generated. These biogas liquids cannot be directly discharged, otherwise it will cause water bodies. Pollution. Since the biogas slurry contains a lot of organic matter, gibberellin, humic acid and other components, it is undoubtedly a good raw material for making farmland fertilizers. However, it is not suitable to directly use the biogas slurry as fertilizer, because the biogas slurry contains not only Pathogenic bacteria and heavy metal ions, and their nutritional factors for plants are not stable and balanced, and their pH value is ...

AI Technical Summary

Problems solved by technology

Because the biogas slurry contains a lot of organic matter, gibberellin and humic acid, it is undoubtedly a good raw material for making farmland fertilizers, but it is not suitable to use the biogas slurry as a fertilizer directly, because the biogas slurry not only contains pathogenic pathogenic bacteria and heavy metal ions, and its nutritional factors for plants are not stable and balanced, and its pH value cannot meet the needs of plant growth

For a long time, due to the lack of in-depth research on the scientific use of biogas slurry, there has been a lack of communication between the waste treatment industry and the planting and breeding industries. How to turn waste into treasure in the waste treatment process is technically at a low level.