Liquid fertilizer conversion treatment method and system for pig manure

Abstract

The invention provides a liquid fertilizer conversion treatment method and system for pig manure. The method comprises steps that: solid-liquid separation is performed on pig manure to obtain pig manure liquid and pig manure residues; the pig manure liquid passes through a screen 1 to screen out particles which have great harm to a reverse osmosis membrane; the screened liquid is subjected to VSEPtreatment, clear liquid obtained after VSEP treatment is treated through a reverse osmosis membrane 1, clear liquid obtained after treatment with the reverse osmosis membrane 1 is treated through a reverse osmosis membrane 2 to obtain clear water, concentrated water obtained after treatment with the reverse osmosis membrane 1 is returned to the VSEP treatment, and concentrated water obtained after treatment with the reverse osmosis membrane 2 is returned to the reverse osmosis membrane 1 treatment; the pig manure residues obtained after solid-liquid separation are subjected to superfine grinding and then evenly mixed with the concentrated water obtained after VSEP treatment according to a preset proportion, and the mixture is fermented to obtain a liquid fertilizer matrix; and the liquidfertilizer matrix is screened through a screen 2 with a corresponding aperture according to the standard for preparing a liquid fertilizer, and the screened liquid is mixed with the added corresponding nutrient solutions according to the requirement for producing the corresponding liquid fertilizer to obtain the corresponding specific liquid fertilizer. The method is simple, efficient, free of pollution, low in cost and high in additional value.

Description

technical field [0001] The invention relates to a pig manure liquid fertilization treatment method and system, in particular to an integrated pig manure liquid fertilization treatment method and system. Background technique [0002] The large-scale and intensive development of the pig breeding industry has led to a large amount of pig manure. Untreated pig manure will cause huge pollution to the environment. However, the resource treatment of pig manure, whether it is first anaerobic fermentation to produce biogas or biogas residue Then aerobic composting, or solid-liquid separation of pig manure, and then aerobic composting of solid dung, the final product of these two disposal methods is solid organic fertilizer. At present, the demand for liquid organic fertilizers for spraying or drip irrigation in the waste market is increasing day by day, and the technology of directly producing liquid organic fertilizers from pig manure has not yet been discussed. At the same time, a...

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Problems solved by technology

At present, the demand for liquid organic fertilizers for spraying or drip irrigation in the waste market is increasing day by day, and the technology of using pig manure to directly produce liquid organic fertilizers has not yet been discussed.

At the same time, a large amount of biogas slurry in the anaerobic disposal method cannot meet the national standards for commercial liquid organic fertilizers, and is not easy to sell in the market, so it can only be consumed on the spot, and a sufficient scale of fields needs to be allocated, which often limits the site selection of pig farms

Aerobic composting of pig manure also has the problem of long fermentation time and large area

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