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Method for preparing liquid fertilizer by comprehensively recycling excrement and urine biogas slurry in livestock and poultry farm

A technology for comprehensive treatment and farms, which is applied in the field of comprehensive treatment of manure and urine biogas slurry in livestock and poultry farms to recover and prepare liquid fertilizer, and can solve the problems of insufficient treatment methods of anaerobic fermentation biogas slurry for livestock and poultry.

Inactive Publication Date: 2017-11-03
上海田应农业科技有限公司
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Problems solved by technology

[0006] The purpose of the present invention is to provide a method for the comprehensive treatment and recovery of excrement and biogas slurry in livestock and poultry farms to prepare liquid fertilizer in order to overcome the shortage of existing methods for treating livestock and poultry anaerobic fermentation biogas slurry

Method used

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  • Method for preparing liquid fertilizer by comprehensively recycling excrement and urine biogas slurry in livestock and poultry farm

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Embodiment

[0022] A method for comprehensive treatment of excrement and sewage in large-scale livestock and poultry farms to recover liquid fertilizer, the process flow is as follows figure 1 As shown, proceed as follows:

[0023] (1) Filtration treatment of feces and urine biogas slurry: the biogas slurry of the anaerobic fermentation tank is filtered with a plate and frame filter, the filter residue is dried and returned to the field as organic fertilizer, and the filtrate is deflocculated;

[0024] (2) Flocculation treatment: add polyacrylamide flocculant to the filtrate under stirring condition, the addition amount is 0.12% of the filtrate amount, continue to stir for 3 minutes after the flocculant is added, stop stirring, flocculate and settle for 5 hours, Release the supernatant, and filter the flocs at the bottom of the sedimentation tank with a disc centrifuge, then combine the filtrate and the flocculation supernatant to filter with a ceramic membrane;

[0025] (3) Ceramic memb...

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Abstract

The invention relates to a method for preparing a liquid fertilizer by comprehensively recycling excrement and urine biogas slurry in a livestock and poultry farm. The method comprises the following steps: performing anaerobic fermentation on excrement and urine and flushing water in the livestock and poultry farm; filtering fermentation biogas slurry; drying filter residues to prepare a solid organic fertilizer; performing flocculating settling on filtrate; centrifugally filtering a flocculating constituent; combining the filtrate with supernatant formed by flocculating settling; removing macromolecular proteins and colloidal particles through ceramic membrane microfiltration; removing medium and small molecular weight proteins from microfiltration filtrate through ultrafiltration; performing reverse osmosis filtration on ultrafiltration filtrate; adding trace elements and humic acid into a reverse osmosis concentrated solution to prepare a liquid fertilizer conforming to the national standard, wherein reverse osmosis effluent reaches the national specified discharge standard. Compared with the prior art, the process has the advantages that comprehensive treatment and recycling of excrement and urine sewage in the livestock and poultry farm are realized, environmental pollution is prevented, and the prepared liquid fertilizer meets the requirements of national relevant standards on products.

Description

technical field [0001] The invention belongs to the field of excrement and sewage treatment and liquid fertilizer production in livestock and poultry farms, and in particular relates to a method for comprehensively treating and recovering excrement and biogas liquid in livestock and poultry farms to prepare liquid fertilizer. Background technique [0002] In rural areas, the livestock and poultry breeding industry has developed rapidly in recent years, and many large farms have appeared, which produce a large amount of livestock and poultry excrement every day. Livestock and poultry manure and urine are directly stacked or discharged, which not only pollutes the environment, but also wastes resources. In order to reduce the environmental pollution caused by livestock and poultry breeding, the state has formulated the "Discharge Standard of Water Pollutants for Livestock and Poultry Breeding Industry", which strictly limits the discharge of livestock and poultry excrement and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05F3/00C05G3/00C05G3/04C05F17/00C02F9/04C02F103/20C05G3/80
CPCC02F1/001C02F1/38C02F1/441C02F1/444C02F9/00C02F2001/007C02F2103/20C02F2301/08C05F3/00C05F17/00C05G3/80C05G5/23C05F11/02C05G3/00Y02A40/20Y02E50/30Y02W30/40
Inventor 郁雷
Owner 上海田应农业科技有限公司
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