System and method for preparing organic fertilizer by electric dehydration of dry clean cow dung

Abstract

The invention relates to a system and a method for preparing an organic fertilizer by electric dehydration of dry clean cow dung. The system comprises a dung collection tank, a conveying pump, an electric dehydration device, a double-screw conveyor and a rotary composting barrel, a discharging port of a composting tank is connected with a feeding port of the conveying pump, a discharging port of the conveying pump is connected with a mud distribution bucket, so that materials are fed into the electric dehydration device, a dry dung outlet of the electric dehydration device corresponds to a feeding port of the double-screw conveyor, a discharging port of the double-screw conveyor corresponds to a feeding port of the rotary composting barrel, and a discharging port of the rotary composting barrel is correspondingly connected with a rotten workshop through a conveying track. The solid water content of the dehydrated dry clean dung can be lower than 55%, the dry clean dung can be compostedwithout adding accessories, and accessory cost is reduced. Ionic heavy metal can be transferred from the dry dung under an electric field in the dehydrating process, the heavy metal content of a subsequent fertilizer is reduced, and environmental non-point source pollution is reduced.

Description

technical field [0001] The invention relates to an electric dehydration of cow dung in a large-scale cattle farm and a method for preparing organic fertilizer from the dehydrated cow dung. The utility model is especially suitable for direct dehydration of dried cow dung and preparation of organic fertilizer, and belongs to the field of organic fertilizers manufactured by fertilizers and fertilizers. Background technique [0002] Large-scale dairy farms have a large amount of manure discharge and concentrated discharge, which has become a bottleneck restricting the rapid development of my country's dairy farming industry. The treatment and disposal of cow dung, which is composted after solid-liquid separation to produce organic fertilizer or bedding material, has become its main outlet. The composting treatment of cow dung requires a pre-solid-liquid separation process to reduce the moisture content of cow dung to below 65%, so as to ensure the ventilation and porosity requi...

AI Technical Summary

Problems solved by technology

The currently widely used screw extrusion solid-liquid separation technology has simple structure and convenient operation, but also has high requirements such as raw material moisture content (greater than 90%) to meet the fluidity requirements of the equipment in the pumping and extrusion process. requirements), low separation efficiency (after mechanical solid-liquid separation, more than 50% of the solid matter and more than 75% of the nutrients in the cow manure entered the liquid part), poor separation effect (after solid-liquid separation, the moisture content in the solid matter Generally higher than 65%), easy to block and other problems; at the same time, the sensitive problem that exists in any manure composting application---heavy metal pollution cannot be properly solved, which is the main limiting factor and potential safety hazard in realizing cow manure composting

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