Pretreatment method before milk cow manure anaerobic fermentation

A dairy cow manure and anaerobic fermentation technology, applied in biological sludge treatment, animal husbandry wastewater treatment, waste fuel, etc., can solve the problems of difficult promotion, secondary pollution, low biogas yield, etc. The effect of high utilization rate of operation and raw materials

Inactive Publication Date: 2015-06-17
周玲娣
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method has problems such as low biogas yield (a large amount of solids do not enter the anaerobic digester), secondary pollution (a large number of pathogenic microorganisms exist in the separated solids), and it is difficult to promote on a large scale

Method used

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  • Pretreatment method before milk cow manure anaerobic fermentation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A dairy farm of a certain scale produces 800 tons of dairy cow manure every day, the moisture content is 96%, and the total solid content is 4%. 60%. Use a scraper machine to scrape the feces into the sewage pipe, and then flow into the septic tank through the sewage pipe.

[0023] The specific gravity of cow manure is 1, then the effective volume of the manure storage tank is V 1 =800000kg÷1000kg / m 3 =800m 3 , assuming that the filling factor of the septic tank is 80%, the full volume of the septic tank is V 2 =800m 3 ÷80%=1000m 3 , take the total height H of the septic tank 1 =5m, then the area S of the septic tank 1 =1000m 3 ÷5m=200m 2 , take the length L of the cesspool 1 =20m, then the width W 1 =10m, the overall size of the septic tank is L×W×H=20m×10m×5m, and the quantity is 1.

[0024] A submersible mixer is installed in the septic tank, and the power is 10w / m 3 materials, the total installed power of the septic tank submersible mixer is 10w / m 3 ×8...

Embodiment 2

[0031] A dairy farm of a certain scale produces 700 tons of dairy cow manure every day, with a moisture content of 91% and a total solid content of 9%. In dairy cow manure, solid particles with a particle size greater than 1mm and fibrous solids with a length greater than 5mm account for the total solids. 60%. Use a scraper machine to scrape the feces into the sewage pipe, and then flow into the septic tank through the sewage pipe.

[0032] The specific gravity of cow manure is 1, then the effective volume of the manure storage tank is V 1 =700000kg÷1000kg / m 3 =700m 3 , assuming that the filling factor of the septic tank is 80%, the full volume of the septic tank is V 2 =700m 3 ÷80%=875m 3 , take the total height H of the septic tank 1 =5m, then the area S of the septic tank 1 =875m 3 ÷5m=175m 2 , take the length L of the cesspool 1 =17.5m, then the width W 1 =10m, the overall size of the septic tank is L×W×H=17.5m×10m×5m, and the quantity is 1.

[0033] A submersi...

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Abstract

The invention discloses a pretreatment method before milk cow manure anaerobic fermentation, which comprises the following steps: (1) collecting milk cow manure in a manure storage tank, and stirring and mixing to implement solid-liquid uniformity; (2) carrying out solid-liquid separation on the manure in a solid-liquid separation machine; (3) discharging the liquid obtained by solid-liquid separation into a size mixing tank via a solid-liquid separation machine water outlet, and discharging the solid into a feed port of a wet material pulverizer via a discharge port of the solid-liquid separation machine; (4) pulverizing the solid in the wet material pulverizer, sending the pulverized solid into the size mixing tank via a discharge port of the pulverizer, adding tap water, surface water or biogas slurry, and starting a stirrer of the size mixing tank to perform stirring and regulation; and (5) injecting the regulated material into an anaerobic digester by a feed pump, and carrying out anaerobic fermentation to produce biogas. The method solves the problems of feeding equipment and pipe clogging, long anaerobic digestion time, low raw material utilization ratio, low raw material gas generation rate and the like which can be possibly caused in milk cow manure anaerobic fermentation.

Description

technical field [0001] The invention relates to a pretreatment process before anaerobic fermentation of cow manure, which belongs to the pretreatment technology in large and medium-sized biogas projects. Background technique [0002] Large and medium-sized biogas projects are one of the important means to solve rural energy supply, and large and medium-sized biogas projects for livestock and poultry farms account for more than 80% of the total large and medium-sized biogas projects in the country. Since cow feces contain undigested roughage, concentrated feed and other large particles and long fiber impurities, directly entering the anaerobic digester is prone to problems such as feed equipment, pipelines, distributors, and discharge pipelines being blocked. A lot of scum and sediment are produced in the digester. A large amount of scum floats on the liquid surface and cannot fully contact with methanogens, resulting in low gas production rate and preventing the passage of b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/04C02F103/20
CPCY02E50/30
Inventor 周玲娣高庆礼
Owner 周玲娣
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