Strong dewatering method for cow dung

Abstract

A strong dewatering method for cow dung relates to dewatering method of animal manure and cow dung. The animal manure is transported to a disposal site or periphery of the animal house; the animal manure is sent to a feed inlet of a press dewatering machine by a slurry pump or other way; the animal manure is dehydrated by the press dewatering machine; the animal manure after dehydration has moisture rate of 40-50%; pressed liquid is sent into a methane fermentation pool through a minor groove or a precipitation pool; after precipitation, clear water is discharged or used for watering the field; precipitated sludge can be recycled; and dehydrated animal manure is fibrous, and can be directly granulated in a granulator. According to the invention, no water needs to be added for dilution during processing, so as to reduce pollution caused by excessive discharge of sewage and save water resource.

Description

Technical field: [0001] The invention relates to a method for dehydrating livestock dung and cow dung, in particular to a method for powerfully dehydrating cow dung. Background technique: [0002] According to the results of a large-scale livestock and poultry breeding pollution survey conducted by the State Environmental Protection Administration in 23 provinces, autonomous regions and municipalities directly under the Central Government in 2002, the annual production of livestock and poultry manure in China is about 1.9 billion, which is 2.4 times that of industrial solid waste. , Henan, Hunan, Jiangxi and other regions even exceeded 4 times. The COD (chemical oxygen demand) discharge of livestock and poultry manure has reached 71.18 million, far exceeding the sum of COD discharge of industrial wastewater and domestic wastewater, and has become the main source of rural pollution in China. Therefore, the prevention and control of livestock and poultry breeding pollution is...

AI Technical Summary

Problems solved by technology

[0007] Disadvantages: Workers' work intensity is high, efficiency is low, and labor costs continue to increase

[0011] Disadvantages: Loud working noise, easy to cause injury and fright to livestock; limited working hours, it is difficult to ensure the cleanliness of livestock houses; high operating costs

[0015] Disadvantages: a large amount of flushing water is required, and a large amount of sewage is generated

[0016] Due to the high viscosity of cow dung and the presence of moisture in the fiber, the dehydration equipment currently on the market needs to dilute the cow dung with a large amount of water, and then transport it to the dehydrator with a mud pump for extrusion dehydration. The water content of cow dung is reduced to about 65-75%. Such water content of cow dung brings a lot of inconvenience to the post-processing, increases a lot of sewage discharge, and increases the processing cost