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A method for producing biogas by using plant straw and activated sludge

A plant straw and activated sludge technology, which is applied in the fields of renewable energy and environmental protection, can solve the problems of reduced gas production, weak bacterial activity, slow fermentation time, etc., and achieves less water consumption, high utilization rate and short digestion time. Effect

Active Publication Date: 2016-04-06
青岛福创环境科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this patent is that the strain is weak, the fermentation time is slow, and the gas production is reduced

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] (1) Raw material handling:

[0021] Take corn stalks, process them into 5mm pieces by using a pulverizer, put them in a blast drying oven, and process them for 3 hours at 110°C, take them out, put them in a desiccator to cool, and set aside.

[0022] (2) Fermentation preparation

[0023] Get 100 g of straw scraps treated in step (1), add (NH 4 ) 2 SO 4 , CaCO 3 、K 2 HPO 4 , Stir the glucose evenly, and the amount added is calculated by mass ratio, which is respectively: 0.8g, 0.6g, 0.04g, 0.9g. Soak the stalks with 0.03% NaOH solution to make the water content at 80%, and the pH of the solution is 7 to obtain the fermented product.

[0024] (3) Anaerobic fermentation

[0025] Add 40g of activated sludge (in TS) to the fermented product prepared in step (2), adjust the concentration of the fermenter to 80%, the temperature of fermentation to 45° C., and collect gas by drainage method.

[0026] The gas production in 20 days is 360ml / g.

Embodiment 2

[0028] (1) Raw material handling:

[0029] Take corn stalks, use a pulverizer to process them into 3mm fragments, put them in a blast drying oven, and process them at 100°C for 2 hours, take them out, put them in a desiccator to cool, and set aside.

[0030] (2) Fermentation preparation

[0031] Get 200g of straw scraps treated in step (1), add (NH 4 ) 2 SO 4 , CaCO 3 、K 2 HPO 4 , Stir the glucose evenly, and the amount added is calculated by mass ratio, which are respectively: 1.2g, 1g, 0.06g, 2g. Soak the stalks with 0.01% NaOH solution to make the water content at 70%, and the pH of the solution=7 to obtain the fermented product.

[0032] (3) Anaerobic fermentation

[0033] Add 60g of activated sludge (in TS) to the fermented product prepared in step (2), adjust the concentration of the fermenter to 70%, the temperature of fermentation to 55°C, and collect gas by drainage method.

[0034] The gas production in 20 days is 410ml / g.

[0035] Comparative test, no addi...

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Abstract

The invention discloses a method for producing methane from plant straws and activated sludge. The method for producing the methane from the plant straws and activated sludge comprises the following steps: crushing plant straws into aggregates with the length of 2-6mm, and drying; sequentially adding (NH4)2SO4, CaCO3, K2HPO4 and glucose solid into the crushed plant straw aggregates, uniformly stirring, regulating pH of the obtained solution to be 6-8 with alkali liquor with mass fraction of 0.01-0.03%, so that a fermented material is obtained; and adding the activated sludge into the fermented material, wherein addition amount of the activated sludge is 30-50% of the mass of the fermented material, a fermentation temperature is 35-55 DEG C, and gas is collected by utilizing a drainage method. The method for producing the methane from the plant straws and activated sludge has the advantages that water consumption is low in a production process, no waste water is discharged after fermentation, water resource is saved, environmental protection is facilitated, straw digestion time is short, utilization rate is high, gas yield is high, and crusting is not easily generated.

Description

technical field [0001] The invention relates to the technical fields of environmental protection and renewable energy, in particular to a method for producing biogas by using plant straw and activated sludge. Background technique [0002] my country is a large agricultural country with abundant straw resources. According to statistics, the total amount of crop straw produced in our country exceeds 700 million tons every year. The main types of straw are rice straw, wheat straw, and corn straw, of which corn straw accounts for 36.7%, rice straw accounts for 27.5%, and wheat straw accounts for 15.2%. In recent years, with the development of the rural economy and the improvement of farmers' living standards, the development of the rural economy and the great improvement of energy supply, straw was used as fuel and fertilizer in the past, but now it is basically replaced by coal, gas, electricity and chemical fertilizers. As a result, the amount of remaining crop residues is in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C12P5/02
CPCY02E50/30
Inventor 任宪君张淑娟张秋艳
Owner 青岛福创环境科技有限公司
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