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Sodium hydroxide and ammonia water combined with low temperature pretreatment of corn straw to improve the performance of anaerobic digestion gas production

A technology of low temperature pretreatment and corn stalk, which is applied in the field of anaerobic digestion technology, can solve problems such as long pretreatment time, and achieve the effects of increasing methane volume, less secondary pollution, and increasing methane volume fraction

Active Publication Date: 2020-11-20
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The digestion period is 70 days. Compared with the method without ammonification pretreatment, the cumulative gas production has increased by 8-38%. Compared with the sodium hydroxide pretreatment method, this method will not cause secondary pollution. At the same time, there is no need to adjust the carbon-nitrogen ratio, but the disadvantage is that the pretreatment time is long, and no specific research has been made on the total methane production, and this method is to pretreat the straw under medium temperature conditions, without considering the low temperature conditions. corn stover pretreatment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Weigh four parts of corn stalks crushed to 20 mesh, each part of corn stalks has a weight of 52g (calculated as TS), add 2% sodium hydroxide and 4% ammonia (calculated as pure ammonia molecules) of its dry weight, add 302.44 milliliters of water The total mass of water (6.24 milliliters) in the ammonia and the water contained in the corn stover (3.32 milliliters) was six times the dry weight of the corn stover (312 milliliters). Set up three groups of comparative experiments simultaneously: the first group is the sodium hydroxide pretreatment that only adds 2% of corn stalk dry weight, adds 308.68 milliliters of water and the total mass of the water (3.32 milliliters) contained in the corn stalk simultaneously is corn stalk dry Heavy six times (312 milliliters); The second group is to add only 2% ammonia (calculated in pure ammonia molecules) of corn stalk dry weight as a group, add 302.44 milliliters of water simultaneously and make it with the water in the ammonia (6.2...

Embodiment 2

[0031] Weigh four parts of corn stalks crushed to below 20 mesh, each part of corn stalks has a weight of 52g (calculated as TS), add 2% sodium hydroxide and 2% ammonia (calculated as pure ammonia molecules) to its dry weight, add 305.56 ml The total mass of water made with the water in ammonia (3.12 ml) and the water contained in the corn stover (3.32 ml) was six times the dry weight of the corn stover (312 ml). Set up three groups of comparative experiments simultaneously: the first group is the sodium hydroxide pretreatment that only adds 2% of corn stalk dry weight, adds 308.68 milliliters of water and the total mass of the water (3.32 milliliters) contained in the corn stalk simultaneously is corn stalk dry Six times (312 milliliters) of the weight; the second group is pretreated as a group by only adding 2% ammonia (calculated in pure ammonia molecules) of the dry weight of corn stalks, and adding 305.56 milliliters of water to make it with the water (3.12 milliliters) in...

Embodiment 3

[0035] Weigh four parts of corn stalks crushed to below 20 mesh, each part of corn stalks has a weight of 52g (in TS), add 2% of its dry weight sodium hydroxide and 10% of ammonia (calculated in pure ammonia molecules), add 293.08 ml of water make the total mass of the water in the ammonia (15.60 ml) and the water contained in the corn stover (3.32 ml) six times the dry weight of the corn stover (312 ml). Set up three groups of comparative experiments simultaneously: the first group is the sodium hydroxide pretreatment that only adds 2% of corn stalk dry weight, adds 308.68 milliliters of water and the total mass of the water (3.32 milliliters) contained in the corn stalk simultaneously is corn stalk dry Heavy six times (312 milliliters); The second group is to add only 10% ammonia (calculated with pure ammonia molecules) of corn stalk dry weight as a group of pretreatment, add 293.08 milliliters of waters simultaneously and make it with the water in the ammonia (15.60 millilit...

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Abstract

The invention discloses a method for low-temperature pretreatment of a corn straw to improve gas production performance of anaerobic digestion by combination of sodium hydroxide and ammonia water, and belongs to the technical field of efficient resource utilization of the corn straw. The method comprises the following steps: carrying out pretreatment the corn straw at -20 to 20 DEG C by employing sodium hydroxide and ammonia as pretreatment agents, and carrying out sealed storage for 3 days, wherein the pretreatment agents are sodium hydroxide and ammonia water; adding water, so that the total mass of the added water, the water in the ammonia water and the water contained in the corn straw is six times of dry weight of the corn straw; fully stirring, and sealing by a sealing film; carrying out sealed storage in a refrigerator at -20 DEG C for 3 days, and then carrying out anaerobic fermentation, wherein activated sludge is needed in the anaerobic fermentation process; adding activated sludge, adding running water to reach 80% of total volume of the reaction device; filling nitrogen, and sealing by virtue of a rubber stopper; and fixing the reactor in a table concentrator, keeping the constant temperature of the table concentrator at 35+ / -2 DEG C and shaking. The method is mild in operation condition, and low in demands on compressive strength and corrosion resistance of the reactor; and the added ammonia water can be used as a nutrient of microorganisms, and is friendly to environment and low in secondary pollution.

Description

technical field [0001] The invention belongs to the technical field of high-efficiency resource utilization of corn stalks, and relates to an anaerobic digestion process for combined pretreatment of corn stalks with sodium hydroxide and ammonia. Background technique [0002] Corn stalks belong to cellulosic biomass, rich in nutrients and easy-to-use chemical components, and are rich in renewable organic substances, but most of them are discarded or burned in the open, causing serious waste of resources, environmental pollution, and obstruction of normal traffic. question. [0003] Corn straw is mainly composed of three major components: cellulose, hemicellulose and lignin. Anaerobic digestion technology is used to process and utilize corn straw to produce efficient, clean and high-quality biomass energy—biogas, which is the resource utilization of corn straw. effective way. However, hemicellulose, as a molecular adhesive, binds between cellulose and lignin, embeds cellulos...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C12P5/02
Inventor 李秀金刘春梅袁海荣邹德勋刘研萍朱保宁
Owner BEIJING UNIV OF CHEM TECH
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