Resource utilization method for cow-dung separating liquid

A technology for separating liquid and recycling it is applied in the field of resource utilization of cow dung separation liquid, which can solve the problems of wasting water and difficult to handle biogas liquid, and achieve the effects of not easy clogging, low moisture content and high fermentation efficiency.

Inactive Publication Date: 2018-07-20
SOUTHWEST UNIV
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0003] Most existing cattle farms use cow manure and urine to directly mix food waste for anaerobic fermentation. This treatment method needs to add water to adjust the TS of the feed liquid, which wastes a lot of water. Food waste needs to be pretreated, and its biogas volume The gas production efficiency is only about 1.5m³ / (m³.d), and a large amount of biogas slurry is also difficult to handle

Method used

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  • Resource utilization method for cow-dung separating liquid

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Effect test

Embodiment 1

[0022] A method for resource utilization of cow dung separation liquid, specifically comprising the following steps:

[0023] (1) Collect the feces and urine from large-scale cattle farms with a sewage suction truck and send them to the sewage collection tank of the biogas factory, and transport them to the variable pitch and variable shaft diameter screw extrusion solid-liquid separator through the action of the screw pump for solid-liquid separation. Separating, respectively obtaining a cow dung separation liquid with a total solid content (TS) of 5%, and an isolated solid with a moisture content of 41% by mass; wherein, the obtained isolated solid is used as a bedding material for cattle bedding after natural drying;

[0024] (2) Mix the obtained cow dung separation liquid with the rice bran obtained from rice processing and production according to the dry matter mass ratio of 1:1.5, and stir evenly to form a mixed raw material;

[0025] (3) Use a pump to send the obtained ...

Embodiment 2

[0028] A method for resource utilization of cow dung separation liquid, specifically comprising the following steps:

[0029] (1) Collect the feces and urine from large-scale cattle farms with a sewage suction truck and send them to the sewage collection tank of the biogas factory, and transport them to the variable pitch and variable shaft diameter screw extrusion solid-liquid separator through the action of the screw pump for solid-liquid separation. Separation, to obtain the cow dung separation liquid with a total solid content (TS) of 6%, and the separation solid with a moisture content of 40% by mass; wherein, the obtained separation solid is directly mixed with pig manure or chicken manure after natural drying Mix compost, adjust the moisture and carbon-nitrogen ratio (C / N) of the compost, and improve the compost effect;

[0030] (2) Mix the obtained cow dung separation liquid with the rice bran obtained from rice processing and production according to the dry matter mas...

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Abstract

The invention relates to a resource utilization method for cow-dung separating liquid. The resource utilization method includes the following specific steps that (1) cultivated-cow dung urine pollution is collected, solid-liquid separation is carried out, and the cow-dung separating liquid with the total solid content of 5% to 6% is obtained; (2) the cow-dung separating liquid and rice bran are evenly stirred to form a mixed raw material; (3) the mixed raw material is fed into a full-mixing anaerobic fermentation reactor and subjected to medium-temperature anaerobic fermentation, marsh gas generated through anaerobic fermentation is collected, biogas slurry generated after reacting is used for returning to the field. According to the resource utilization method, the resource utilization efficiency of single large-scale cultivated-cow dung pollution is high, water resources required by mixing anaerobic fermentation treatment are saved, and the generated biogas slurry is also easily treated.

Description

technical field [0001] The invention relates to the fields of livestock and poultry breeding pollutant treatment and resource recycling of agricultural product processing residues, in particular to a method for resource recycling of cow dung separation liquid. Background technique [0002] At present, the resource utilization of livestock and poultry breeding pollutants is a major problem in the development of animal husbandry. Compared with pig manure and chicken manure, the large-scale collection of cow manure and urine often uses a scraper to push the cow manure and urine together into the sewage collection tank at one end of the cowshed to achieve concentration. The total solid content (TS) of manure and urine is about 12%, which cannot be directly used for composting. Even if it is dehydrated first and then composted, its fertilizer efficiency is relatively low. If it is directly anaerobic fermentation, its lignocellulose content is high, and the yield The efficiency o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/12C02F3/28C05F3/00C05F15/00C02F103/20
CPCC02F3/28C02F3/2866C02F11/12C02F11/121C02F2103/20C05F3/00C05F5/002C05F11/08C05F11/10Y02A40/20
Inventor 关正军张洋洋刘晗晓
Owner SOUTHWEST UNIV
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