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A method of hydrothermal pretreatment to increase the production of ethanol from kitchen waste

A technology for food waste and hydrothermal treatment, applied in the direction of microorganism-based methods, biochemical equipment and methods, microorganisms, etc., can solve the problems of complex composition of biological bacteria liquid and mixed enzyme preparation, difficult acquisition of bacteria, cumbersome configuration methods, etc. , to achieve good application value, low production cost and high raw material utilization

Active Publication Date: 2015-07-29
SOUTH CHINA AGRI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Invention patent "A method for producing ethanol by using food waste" (CN102321722 A) uses biological bacteria liquid and mixed enzyme preparation to ferment food waste to produce ethanol, but the composition of biological bacteria liquid and mixed enzyme preparation is complicated, and the bacteria are not easy to obtain , the configuration method is relatively cumbersome, and there are certain difficulties in practical applications

Method used

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  • A method of hydrothermal pretreatment to increase the production of ethanol from kitchen waste

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Embodiment 1

[0034] 1. Preliminarily sort the collected food waste, remove the sundries that are not easy to ferment, put it into the hydrothermal reactor, add 1 times the volume of water, and conduct hydrothermal treatment at 140°C for 50 minutes, during which time, turn on the motor to stir for 20 minutes.

[0035] 2. After the hydrothermal treatment, spray the kitchen waste to the three-phase separator, and separate the grease after standing still.

[0036]3, water and solid are sent to fermentation tank, add the composite enzyme of 0.5% of solid weight, the mass ratio of various enzymes in composite enzyme is amylase: cellulase: lipase: protease: glucoamylase: xylanase= 2:0.8:0.6:1.3:1:2.5. The composition of the enzyme preparation is: amylase (200000u / g), cellulase (200000u / g), lipase (200000u / g), protease (200000u / g), glucoamylase (100000u / g), xylanase (100000u / g). Then add 10% composite flora of solid weight, and ferment for 96 hours at 32°C. The ratio of each species in the comp...

Embodiment 2

[0038] The main steps of this embodiment are the same as in Example 1, the difference is that in step 1, when the food waste contains more water, after preliminary sorting to remove impurities that are not easy to ferment, it is directly hydrothermally treated at 200°C for 10 minutes, and at the same time Do not turn on the stirring motor. After the hydrothermal treatment, the pressure is released. When the pressure of the hydrothermal reactor is released to 1.3atm, the kitchen waste is sprayed into the three-phase separator, and after standing still, the oil and the water exceeding the solid-liquid ratio range required for ethanol fermentation are separated. The remaining solids and water were sent to the fermenter, and 0.05% of the solid weight of the compound enzyme and 35% of the solid weight of the mixed flora were added, and fermented at 35°C for 130 hours.

Embodiment 3

[0040] The main steps of this embodiment are the same as in Example 1, the difference is that in step 3, the kitchen waste water stored in three-phase separation is added so that the solid-liquid volume ratio is 1:6, and then 2% of the solid weight of the compound enzyme and the solid weight are added 0.3% of the complex flora. Wherein, the mass ratio of each enzyme in the compound enzyme is amylase: cellulase: lipase: protease: glucoamylase: xylanase=0.5:5:1:2:2:1. The ratio of each bacterial species in the composite flora is Kluyveromyces: Saccharomyces cerevisiae: Pseudomonas saccharophila: Bacillus subtilis: Aspergillus niger: Rhizopus oryzae: Trichoderma konii: Mucorella ruckeri=7: 1:5:1:1:6:1:1. Fermentation was carried out at 43°C for 96 hours.

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Abstract

The invention discloses a method for improving alcohol output of kitchen waste by hydrothermal pretreatment, wherein kitchen waste is used as raw material for producing energy, so that biomass recycling is realized while waste material is fully used. The method comprises the following steps: performing sorting, hydrothermal treatment and three-phase separation on the kitchen waste, and then, adding complex enzyme and mixed flora into the separated solid waste to perform fermentation so as to generate alcohol; reusing the wastewater obtained by three-phase separation for a fermentation tank, purifying and discharging or reusing the kitchen wastewater which is not reused; preparing biodiesel from the oil obtained by three-phase separation through ester exchange reaction. In the method for improving alcohol output of kitchen waste by hydrothermal pretreatment, by virtue of the hydrothermal treatment technology, the kitchen waste is hydrolyzed more completely, and by simultaneous feeding of the complex enzyme and mixed flora, high-efficiency production of alcohol from fermented kitchen waste can be realized. Strains selected for the method are simple and easy to obtain, the disposition method is simple, the fermentation technology is simple and convenient, and the fermentation effect is excellent, so that the method for improving alcohol output of kitchen waste by hydrothermal pretreatment is especially suitable for industrialized application.

Description

technical field [0001] The invention belongs to the field of kitchen waste treatment, and in particular relates to a method for increasing the production of kitchen waste ethanol through hydrothermal pretreatment. Background technique [0002] With the depletion of the world's oil resources, it is imminent to find new alternative energy sources, and energy development has become a strategic issue for all countries. Food waste is a kind of biomass energy, which has the characteristics of high moisture content, high oil and organic matter content, and is a good raw material for the preparation of fuel ethanol. Fuel ethanol prepared from it is the second generation of biomass energy. Fuel ethanol has the advantages of cleanliness, safety and environmental protection and has gradually become the most potential new energy. [0003] In the existing technology of producing ethanol from organic waste, fermentation conditions and strains have a great influence on the quality and yi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C12P39/00C12P7/14C12P7/08C12R1/865C12R1/38C12R1/125C12R1/685C12R1/845C12R1/785C12R1/885C12R1/645
CPCY02P20/133Y02P20/582
Inventor 王春铭劳嘉朗陈小冰张文平周敬锦
Owner SOUTH CHINA AGRI UNIV
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