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Method for coproducing alcohol and marsh gas by virtue of cassava and method for generating electricity by virtue of marsh gas

A cassava and biogas technology, applied in fermentation, biofuel, waste fuel, etc., can solve problems such as increased production costs, waste of resources, secondary pollution, etc., to improve solid-liquid separation flux, reduce energy consumption and costs, and avoid The effect of secondary pumping

Inactive Publication Date: 2020-06-09
GUOTOU BIO TECH INVESTMENT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because the wastewater produced by cassava fermentation to produce ethanol contains high concentrations of organic matter, most of the wastewater discharged from ethanol plants is directly discharged outside without effective treatment, which has a serious impact on the local and downstream water environment.
[0003] At present, the COD of the waste mash produced by cassava fermentation to ethanol is about 50,000-80,000mg / L. The current treatment methods include: 1. Incineration method, which is to incinerate the waste mash after concentration. The disadvantage of this method is that it is easy to cause Secondary pollution, and because of the high COD value in cassava waste mash, direct waste caused a waste of resources; 2. Fermentation of waste mash to prepare biogas, but currently the biogas production of waste mash to prepare biogas is low, and the production Wastewater after biogas has high viscosity and difficult solid-liquid separation, resulting in high energy consumption when cassava co-produces alcohol and biogas, thereby increasing production costs

Method used

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  • Method for coproducing alcohol and marsh gas by virtue of cassava and method for generating electricity by virtue of marsh gas
  • Method for coproducing alcohol and marsh gas by virtue of cassava and method for generating electricity by virtue of marsh gas

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Embodiment approach

[0065] According to a preferred embodiment of the present invention, the water used for pulp preparation is the liquid phase after the first-stage sedimentation and the second-stage sedimentation or the clear liquid after the oxidation reaction and sedimentation, thereby greatly saving the consumption of fresh water.

[0066] In the present invention, the liquefaction is preferably jet liquefaction. Specifically, the cassava pulverized product is mixed with amylase and then jet liquefied to obtain a liquefied product. There is no particular limitation on the type and dosage of the amylase, which may be amylase and dosage commonly used in the art. Preferably, relative to 1 gram of the pulverized product, the amylase is used in an amount of 8-24 enzyme activity units. The amylase is preferably an alpha-amylase.

[0067] The α-amylase is also called starch 1,4-dextrinase, which can randomly and irregularly cut the α-1,4-glucosidic bond inside the starch chain, hydrolyze the star...

Embodiment 1

[0100] This embodiment is used to illustrate the method and power generation method of utilizing cassava to co-produce alcohol and biogas in the present invention

[0101] (1) Starch pulping

[0102] After being unloaded, the dried cassava chips are transported to the sieve by a self-unloading silo for sieving, wherein the underscreen is removed from the stones, iron pieces and braids, mixed with the oversize and crushed, passed through a 1.8mm sieve, and passed through a 1.8mm sieve. In the slurry tank, the temperature is 40° C., and the water containing 150 ppm bleaching powder is used to prepare a starch slurry with a solid content of 35% by weight.

[0103] (2) Jet liquefaction and saccharification

[0104] Mix the starch emulsion obtained in step (1) with α-amylase (high-temperature-resistant α-amylase, purchased from Genencor) and spray liquefy to obtain a liquefied product; wherein, the pulverization of 1 gram of cassava product, the dosage of the α-amylase is 20 enzy...

Embodiment 2

[0123] This embodiment is used to illustrate the method and power generation method of utilizing cassava to co-produce alcohol and biogas in the present invention

[0124] (1) Starch pulping

[0125] After being unloaded, the dried cassava chips are transported to the sieve by a self-unloading silo for sieving, wherein the underscreen is removed from the stones, iron pieces and braids, mixed with the oversize and crushed, passed through a 1.8mm sieve, and passed through a 1.8mm sieve. In the slurry tank, the temperature is 35° C., and the water containing 300 ppm bleaching powder is used to prepare a starch slurry with a solid content of 38% by weight.

[0126] (2) Jet liquefaction and saccharification

[0127] Mix the starch emulsion obtained in step (1) with α-amylase (high-temperature-resistant α-amylase, purchased from Genencor) and spray liquefy to obtain a liquefied product; wherein, the pulverization of 1 gram of cassava product, the dosage of the α-amylase is 15 enzy...

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Abstract

The invention relates to the marsh gas fermentation field, and discloses a method for coproducing alcohol and marsh gas by virtue of cassava and a method for generating electricity by virtue of the marsh gas. The method for coproducing alcohol and marsh gas comprises the following steps: sequentially carrying out crushing, pulp mixing, liquidation, saccharification and fermentation on the cassava,so as to obtain fermented mash; distilling the fermented mash, so as to obtain alcohol and waste mash liquid; cooling the waste mash liquid, inoculating a fermentation strain, and carrying out anaerobic fermentation at 50-70 DEG C for 18-25 days, so as to generate the marsh gas, wherein the anaerobic fermentation is carried out in at least one group of anaerobic fermentation systems, each group of the anaerobic fermentation systems comprises a plurality of anaerobic fermentation units which are connected in series, and multiple groups of the anaerobic fermentation systems are connected in parallel. The method for generating the electricity by virtue of the marsh gas comprises the steps of: preparing desulfurated marsh gas, and burning the desulfurated marsh gas in a high-temperature and high-pressure gas boiler so as to generate steam, wherein the generated steam is used for generating the electricity by virtue of a high-temperature and high-pressure turbine, the high temperature is at least 540 DEG C, and the high pressure is at least 9.8MPa. According to the two methods, the yield of the marsh gas can be remarkably increased, the generating capacity can be increased, and the energy consumption of a whole system can be reduced.

Description

technical field [0001] The invention relates to the fields of ethanol production from cassava and biogas fermentation, in particular to a method for co-producing alcohol and biogas by using cassava, and a method for generating electricity by using the prepared biogas. Background technique [0002] Cassava is one of the three largest tuber crops in the world and is the preferred raw material for the production of bioethanol. As of 2005, my country's cassava planting area has reached 6.57 million mu, and there are more than 200 cassava starch and alcohol processing plants in the country, with an annual production of 500,000 tons of starch and 250,000 tons of cassava ethanol. Because the wastewater produced by cassava fermentation to produce ethanol contains high concentrations of organic matter, most of the wastewater discharged from ethanol plants is directly discharged outside without effective treatment, which has a serious impact on the local and downstream water environme...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12P5/02C12P7/10
CPCC12P5/023C12P7/10C12P2201/00C12P2203/00Y02E50/10Y02E50/30
Inventor 林海龙熊强刘劲松于建东
Owner GUOTOU BIO TECH INVESTMENT CO LTD
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