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Method for increasing wheat straw anaerobic gas yield through pretreatment of catalysis-ammoniation on wheat straws in solid state at normal temperature

A technology of pretreatment and gas production, which is applied in the field of pretreatment, can solve the problems of long ammoniation pretreatment time, and achieve the effect of being suitable for large-scale production, saving operating costs and reducing engineering investment

Active Publication Date: 2015-02-04
BEIJING UNIV OF CHEM TECH
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  • Claims
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Problems solved by technology

Compared with the method without ammoniation pretreatment, the cumulative gas production has increased by 8-38%. The disadvantage is that the ammoniation pretreatment takes a long time

Method used

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  • Method for increasing wheat straw anaerobic gas yield through pretreatment of catalysis-ammoniation on wheat straws in solid state at normal temperature
  • Method for increasing wheat straw anaerobic gas yield through pretreatment of catalysis-ammoniation on wheat straws in solid state at normal temperature
  • Method for increasing wheat straw anaerobic gas yield through pretreatment of catalysis-ammoniation on wheat straws in solid state at normal temperature

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Take by weighing 3 parts of wheat straw, every part of wheat straw is 97.5g (in TS), account for 2%, 3%, 4% NH of the dry weight of wheat straw respectively 3 ·H 2 O and 0.04875g of anthraquinone (accounting for 0.05% of the dry weight of wheat straw) were mixed, and then 292.5g of water (equivalent to 3 times the water of the dry weight of wheat straw) were added to make NH 3 ·H 2 O and anthraquinone were mixed with each other, sprayed on the chopped wheat straw after uniform mixing, put in a sealed bag, and sealed and stored at 15°C for 4 days.

[0033] Simultaneously with 2% NH 3 ·H 2 O without anthraquinone pretreatment of wheat straw as a control.

[0034] The pretreated raw material is mixed with 200 g (15 g / L in terms of MLSS) inoculum sludge and added to the anaerobic fermentation reactor, and water is added to make the effective volume of the reactor 1.5 L. The reactor was sealed at 35°C for anaerobic reaction for 55 days, and the daily gas production and ...

Embodiment 2

[0039] Take by weighing 3 parts of wheat straw, every part of wheat straw is 97.5g (in TS), account for 2%, 3%, 4% NH of the dry weight of wheat straw respectively 3 ·H 2 O and 0.0975g of anthraquinone (accounting for 0.1% of the dry weight of wheat straw) are mixed, and then add 390g of water (equivalent to 4 times the water of the dry weight of wheat straw) to make NH 3 ·H 2 O and anthraquinone were mixed with each other, sprayed on the chopped wheat straw after uniform mixing, put in a sealed bag, and sealed and stored at 20°C for 4 days.

[0040] Simultaneously with 2% NH 3 ·H 2 O without anthraquinone pretreatment of wheat straw as a control.

[0041] The pretreated raw material is mixed with 200 g (15 g / L in terms of MLSS) inoculum sludge and added to the anaerobic fermentation reactor, and water is added to make the effective volume of the reactor 1.5 L. The reactor was sealed at 35°C for anaerobic reaction for 55 days, and the daily gas production and methane conten...

Embodiment 3

[0046] Take by weighing 3 parts of wheat straw, every part of wheat straw is 97.5g (in TS), will account for 9%, 13.5%, 18% of NH 4 HCO 3 Mix with 0.04875g anthraquinone (accounting for 0.05% of dry weight of wheat straw), then add 487.5g water (equivalent to 5 times of water of dry weight of wheat straw) to make NH 4 HCO 3 Mix with anthraquinone, mix evenly, spray on the chopped wheat straw respectively, put in a sealed bag, and store in a sealed bag at 25°C for 4 days.

[0047] Simultaneously with 2% NH 3 ·H 2 O without anthraquinone pretreatment of wheat straw as a control.

[0048] The pretreated raw material is mixed with 200 g (15 g / L in terms of MLSS) inoculum sludge and added to the anaerobic fermentation reactor, and water is added to make the effective volume of the reactor 1.5 L. The reactor was sealed at 35°C for anaerobic reaction for 55 days, and the daily gas production and methane content were measured every day. The results are shown in Figure 4 . Afte...

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Abstract

The invention discloses a method for increasing the wheat straw anaerobic gas yield through pretreatment of catalysis-ammoniation on wheat straws in a solid state at normal temperature. The method comprises the following steps of: mixing an ammonia-containing solution and anthraquinone, adding water of which the weight is less than 2.5 to 5.5 times the dry weight of the wheat straws into the mixture, and fully mixing the mixture and the crushed wheat straws, wherein the mixed wheat straws are still in a wet solid state; storing the mixture for 4 days in a sealed bag at normal temperature, allowing ammonia which carries the anthraquinone to gradually adhere to the surfaces of the wheat straws because the ammonia has volatility, wherein catalysis-ammoniation reaction is performed; and adding the pre-treated wheat straws, inoculation mud and a proper amount of water into an anaerobic digestion reactor to perform anaerobic digestion, wherein the whole anaerobic digestion process lasts for 25 to 35 days. Results show that the gas yield of the wheat straws pre-treated by the method is obviously increased. When the wheat straws pre-treated by the method are compared with the wheat straws pre-treated by ammoniation through only 2 percent of ammonia, the gas yield of unit TS of the wheat straws which are subjected to catalysis-ammoniation through the anthraquinone is 17 to 56.6 percent higher than that of the wheat straws which are not subjected to catalysis-ammoniation through the anthraquinone, the anaerobic digestion time is shortened by 41.42 percent, and the content of the efficient component methane in the biogas is improved by about 3 to 10 percent, so that the production efficiency of the anaerobic digestion reactor is improved.

Description

technical field [0001] The invention relates to a pretreatment method for improving the yield of straw anaerobic digestion biogas, in particular to a method for improving wheat straw anaerobic digestion biogas by normal temperature solid-state AQ catalytic ammonification pretreatment. Background technique [0002] my country is the largest agricultural country in the world, producing more than 700 million tons of straw every year, of which about 140 million tons of wheat straw is produced, accounting for 19.7% of the total. In addition to a small amount of straw being used for papermaking and other raw materials, a large amount of straw is burned in the open air or returned to the field, which seriously affects the quality of the environment and the safety of transportation, and also causes a waste of resources. [0003] Anaerobic digestion technology can convert straw into clean energy, which is an effective way to realize energy utilization of resources. Due to the high l...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C12P5/02
CPCY02E50/343Y02E50/30
Inventor 李秀金袁海荣邹德勋马淑勍杨懂艳张亚甜朱保宁刘研萍
Owner BEIJING UNIV OF CHEM TECH
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