Method and device for producing organic concentrated compound liquid fertilizer from marsh liquid at normal temperature

Abstract

The invention provides a method and device for producing an organic concentrated compound liquid fertilizer from marsh liquid at normal temperature, and aims to provide a method for producing an organic concentrated compound liquid fertilizer from marsh liquid, which has the advantages of low cost and high degree of automation. The method comprises steps as follows: marsh liquid is filtered by a marsh liquid filter pond to remove large-granule substances containing plant fibers and sand grains, enters a marsh liquid stock solution storage tank, is pumped to a marsh liquid mechanical filter, a marsh liquid multimedia filter and a marsh liquid precision filter to remove high-molecular substances containing algae, pesticide residues, and bacteria, and is filtered by a marsh liquid cross-flow ultrafilter; the unfiltered liquid enters a concentrated liquid storage tank, and the filtrate enters an aromatic polyamide membrane element concentration device to be concentrated and separated; the separated concentrated liquid enters the concentrated liquid storage tank, and is delivered to a marsh liquid preparation tank to prepare the liquid fertilizer; the filtrate enters a pure water storage tank for cleaning equipment; and the liquid fertilizer is sterilized by an on-line sterilizer, and then packaged to serve as a plant liquid fertilizer for crops, flowers and the like.

Description

technical field [0001] The invention belongs to the field of preparation of liquid organic fertilizers produced from biogas slurry for recycling waste resources. Specifically, it relates to a method and equipment for producing organic concentrated compound liquid fertilizers at normal temperature using physical methods. Background technique [0002] Biogas slurry is the residue produced by anaerobic fermentation of organic waste such as human and animal manure and crop stalks in the biogas tank. It is a high-quality organic fertilizer. The conventional nutrients required by crops, flowers and other plants in the biogas slurry include nitrogen, phosphorus, and potassium. , magnesium, calcium and other elements, a small amount of trace elements, active organic ingredients include humic acid, indole acetic acid, lactic acid bacteria, gibberellin, cytokinin and other plant hormones, B vitamins include B 1 , B 2 , B 5 , B 6 , B 11 , B 12 , also contains a variety of amino ac...

AI Technical Summary

Problems solved by technology

[0003] The content of these active ingredients in the biogas slurry is relatively low, the concentration is generally about 10%, and the rest are free water and plant fibers, sediment, bacteria, clay, colloids, pesticide residues, suspended solids and organic matter with a foul smell. Therefore, the direct application of this biogas slurry to plants such as crops and flowers does not meet the agricultural hygiene standards, which may cause secondary pollution of farmland, and will also adversely affect the growth conditions and growth environment. Moreover, the amount of direct application of this biogas slurry is relatively large Large, this will inevitably increase the transportation cost and labor intensity of the biogas slurry, not to mention that in the non-fertilizer season, the biogas slurry cannot be fully utilized, and the disorderly discharge of excess biogas slurry will cause environmental pollution and waste. In order to avoid the spread of diseases and Soil pollution, as fertilizer needs to be further processed before it can be used. An effective way is to extract the useful components in the biogas slurry, remove excess water and harmful substances, and carry out purification processing

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