Method and equipment for preparing organic fertilizer from river and lake bottom mud and livestock and poultry manure

Abstract

The invention discloses a method and equipment for preparing an organic fertilizer from river and lake bottom mud and livestock and poultry manure, and belongs to the technical field of resource utilization of river and lake bottom mud. The invention relates to a method for preparing an organic fertilizer from river and lake bottom mud and livestock and poultry manure. The method comprises the following steps: conveying bottom mud to a ship for filter-pressing dehydration; settling and flocculating the sludge and performing material property improvement; performing innocent treatment on supernate, and dehydrating and innocent treatment on sludge; mixing the sludge with the straw; pressing the sludge into a mud cake; decomposing livestock and poultry manure in a storage yard; mixing the mud cake with the puffed organic material; composting finished organic fertilizer; and weighing, packaging and outputting finished products. According to the method, the sediment and the livestock and poultry manure are organically combined, a certain amount of straw or reed is added, and utilization of the sediment can be achieved while desilting is conducted; therefore, the occupied area of the whole bottom mud pretreatment system is reduced, and the bottom mud treatment period is shortened. Raw materials such as composted livestock and poultry manure and straw are mixed with sludge, an industrial assembly line can be directly formed on site, the production efficiency is high, the investment cost is low, and the applicability is high.

Description

technical field [0001] The invention relates to the technical field of resource utilization of river and lake bottom mud, in particular to a method and equipment for preparing organic fertilizer by using river and lake bottom mud and livestock and poultry manure. Background technique [0002] According to statistics, the amount of dredged sediment produced in the Pearl River Delta region of my country alone reaches 80 million m3 each year, and the amount of sediment thrown into the ocean in my country is close to 200 million m3. It can be predicted that in the next 10 years, my country's water conservancy construction, river and lake improvement In the process, a large amount of sediment will still be generated with no place to pile up. How to dispose of this sediment has become an unavoidable practical problem. Problems that have attracted much attention and urgently need to be solved. [0003] At present, the annual production of livestock and poultry manure in my country i...

AI Technical Summary

Problems solved by technology

After natural air-drying, heat treatment, centrifugation, extrusion, and pumping for dehydration, the dehydration efficiency is low, the cycle is long, and the treatment cost is high. Before the dehydration of the sediment, there is often a separate device for adding medicine and conditioning, resulting in the entire dehydration. The treatment system occupies a large area and has high requirements on the moisture content of the sludge. The sludge treatment site is seriously polluted and the working environment is poor.

The existing methods of fertilizer utilization of livestock and poultry manure resources in my country have relatively high processing costs, especially reflected in the cost of fresh manure, equipment costs, auxiliary materials, labor costs and packaging costs, which makes organic fertilizer processing enterprises in a state of meager profit and organic fertilizer The market is small, the quality level is uneven, the application is seasonal, and the inventory cost is high.

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