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Method for producing biogas by mixing and fermenting attapulgite, crop straw and excrement

A technology for crop straw and attapulgite is applied in the fields of resources and environment, which can solve the problems of low efficiency of biogas production per unit, low added value of utilization, etc., and achieve the effects of increasing biogas production and methane content, convenient management and improving conversion efficiency.

Inactive Publication Date: 2015-05-06
HUAIYIN TEACHERS COLLEGE
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a method for producing biogas by fermenting attapulgite with mixed crop straw and feces in view of the low value-added utilization of lignocellulose such as existing crop straws, especially in view of the current low efficiency of lignocellulose per unit biogas production. The method, by adding exogenous attapulgite to improve the efficiency of fermenting crop straw and manure as raw materials to produce biogas and methane, the method is simple in process and can effectively increase the added value of crop straw as agricultural waste

Method used

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  • Method for producing biogas by mixing and fermenting attapulgite, crop straw and excrement
  • Method for producing biogas by mixing and fermenting attapulgite, crop straw and excrement
  • Method for producing biogas by mixing and fermenting attapulgite, crop straw and excrement

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Embodiment 1: produce biogas according to the following steps

[0032] (1) Rice straw crushing: the harvested rice straw is manually cut into small pieces of 3 to 5 cm;

[0033] (2) Weigh 94.6g (dry weight 80g) of the rice straw obtained in step (1) and put it into a 2L fermenter, adjust its water content to 20% with deionized water, then immerse it in 4% NaOH solution, mix well , sealed and placed in a 25°C constant temperature biochemical incubator to react for 5 days;

[0034] (3) Add attapulgite 93.3g (dry weight 80g) and cow dung 136.3g (dry weight 80g) to the pretreated crop straw obtained in step (2), and mix evenly. At this time, the initial carbon-nitrogen ratio of the mixed material is about 20:1;

[0035] (4) Inoculate 135g of biogas slurry from an old biogas digester with a water content of 92.8% into the fermenter. At this time, the amount of the inoculum added is 10% of the dry weight of the mixed material; pH adjusted to 6.5;

[0036] (5) Seal the...

Embodiment 2

[0039] Embodiment 2: produce biogas according to the following steps

[0040] (1) Wheat straw crushing: the harvested wheat straw is mechanically cut into small pieces of 3 to 5 cm;

[0041] (2) Weigh 100.7g (dry weight 80g) of the wheat straw obtained in step (1) and put it into a 2L fermenter, adjust its water content to 25% with deionized water, then immerse it in 5% NaOH solution, mix well , sealed and placed in a 25°C constant temperature biochemical incubator to react for 6 days;

[0042] (3) Add attapulgite 81.7g (dry weight 70g) and pig manure 119.3g (dry weight 70g) to the pretreated crop straw obtained in step (2), and mix evenly. At this time, the initial carbon-nitrogen ratio of the mixed material is about 25:1;

[0043] (4) Inoculate 198g of anaerobic digested sludge from an urban sewage treatment plant with a moisture content of 95.2% into the fermenter. At this time, the amount of the inoculum added is 15% of the dry weight of the mixed material; Adjust th...

Embodiment 3

[0047] Embodiment 3: produce biogas according to the following steps

[0048] (1) Corn stalk crushing: the harvested corn stalks are crushed to 20-50 mesh through a straw kneading grinder;

[0049] (2) Weigh 102.6g (dry weight 80g) of corn stalks obtained in step (1) and put them into a 2L fermenter, adjust the water content to 30% with deionized water, then immerse in 6% NaOH solution, and mix well , sealed and placed in a 25°C constant temperature biochemical incubator to react for 7 days;

[0050] (3) Add attapulgite 70.0g (dry weight 60g) and human manure 102.2g (dry weight 60g) to the pretreated crop straw obtained in step (2), and mix evenly. At this time, the initial carbon-nitrogen ratio of the mixed material is About 30:1;

[0051] (4) Inoculate 269g of slaughterhouse sludge with a moisture content of 93.1% into the fermenter. At this time, the amount of the inoculum added is 20% of the dry weight of the mixture; add water to 2L, and then adjust the initial pH va...

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Abstract

The invention discloses a method for producing biogas by mixing and fermenting an attapulgite, crop straw and excrement. The method comprises the following steps: crushing the crop straw, pretreating for 5-7 days through 4wt%-6wt% NaOH, and then adding three raw materials, namely attapulgite, the pretreated crop straw and the excrement, to a digestion device in a mixing manner for inoculation and fermentation, wherein the initial carbon-nitrogen ratio is regulated to between 20:1 and 30:1, the addition amount of inoculants accounts for 10%-20% of the dry weight of a fermented material, the initial pH value of the fermentation is regulated to 6.5-7.5, the temperature of anaerobic fermentation reaction is 25-35 DEG C, the biogas is generated for 1-2 days, and the fermentation period is 30-40 days. The method disclosed by the invention can be used for improving the efficiency of producing the biogas through the fermentation by taking the crop straw and the excrement as raw materials through adding the exogenous substrate attapulgite, changing the awkward current situation of general low gas output caused by fermenting by taking the crop straw as a main raw material in the vast rural areas and enhancing the additional value of the crop straw as an agricultural waste.

Description

technical field [0001] The invention belongs to the technical field of resources and environment, and in particular relates to a method for producing biogas by fermenting attapulgite mixed with crop straw and manure. Background technique [0002] my country has a large amount of renewable straw resources, and the annual output can reach more than 700 million tons. At present, with the development of my country's agriculture and the improvement of farmers' living standards, the use of straw in rural areas is becoming less and less, and most of them are still treated by burning and returning to the field. Pollution also has adverse effects on some road and air traffic. Efficient use of straw and other cellulosic waste, turning waste into treasure has become a good thing for the country and the people. [0003] At present, there are mainly the following ways to utilize lignocellulose from agricultural and forestry waste such as straw: ① The lignocellulose is crushed and return...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12P5/02C02F11/04
CPCY02E50/30Y02W10/20
Inventor 戴本林徐继明熊鹏王新风周守勇邓媛方胡磊吴真徐宁
Owner HUAIYIN TEACHERS COLLEGE
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