Method for preparing biogas and soil conditioner by utilizing stevia rebaudiana processing waste

A soil conditioner, biogas technology, applied in waste fuels, chemical instruments and methods, soil conditioning materials, etc., can solve the problems of long-term stable operation, easy acidification, easy blockage, etc., to ensure long-term stable supply and solve easy problems. The effect of crusting and avoiding crusting

Active Publication Date: 2014-12-24
GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0006] According to the properties and emission characteristics of stevia waste, the present invention provides a method for preparing biogas and soil conditioner by using stevia waste, so as to solve the problems of easy acidification, easy blockage and long-term stable operation in the process of stevia waste recycling problem, and finally achieved efficient use of stevia waste

Method used

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  • Method for preparing biogas and soil conditioner by utilizing stevia rebaudiana processing waste

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Experimental program
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Effect test

Embodiment 1

[0021] The technological process of this method Stevia rebaudiana processing waste treatment is as follows figure 1 Shown:

[0022] (1) Put the waste residue processed by stevia rebaudiana into a semi-closed waste residue silage tank for silage, and the bottom of the waste residue silage tank is provided with a leachate collection system, which can separate and flow out the waste liquid in the waste residue;

[0023] (2) There is a waste water pretreatment tank connected to the percolation collection system next to the waste silage tank, and the waste liquid separated from the waste silage process and the waste liquid produced in each processing step of stevia can be placed in the waste water pretreatment tank; The bottom of the wastewater pretreatment tank is equipped with an aeration device connected to the biogas tank. The wastewater is subjected to micro-aeration treatment and surface scum is removed through the aeration device. The treated wastewater and silage waste resi...

Embodiment 2

[0030] Stevia waste residue is stored in a semi-closed container for silage treatment, and the leachate is collected to the wastewater pretreatment tank; the stevia processing wastewater is placed in the wastewater pretreatment tank, and the wastewater in the wastewater pretreatment tank is treated with biogas in the gas cabinet. For aeration, the aeration rate is 1m 3 / (m 3 water d); then waste residue and pretreated waste water are put into the mixing tank for mixing, and the solid concentration is controlled to be 15%; the mixed raw materials are pumped into the fermenter for fermentation, and the fermentation temperature is controlled at 30°C, and the fermentation time For 25 days, the hydraulic agitation is started every 12 hours, 15 minutes each time; the produced gas enters the gas storage tank for cogeneration of heat and power; after the fermentation, the fermentation residue is separated from solid and liquid, dried, and the moisture content is controlled at 40% to ...

Embodiment 3

[0032] Stevia waste residue is stored in a semi-closed container for silage treatment, and the leachate is collected to the wastewater pretreatment tank; the stevia processing wastewater is placed in the wastewater pretreatment tank, and the wastewater in the wastewater pretreatment tank is treated with biogas in the gas cabinet. Aeration is carried out, the aeration rate is 3m 3 / (m 3 water d); then waste residue and waste water are put into the mixing tank for mixing, and the solid concentration is controlled to be 20%; the mixed raw materials are pumped into the fermentation tank for fermentation, the fermentation temperature is controlled at 55°C, and the fermentation time is 35 days. Stirring is started every 8 hours, each time for 30 minutes; the generated biogas enters the gas storage cabinet for the preparation of bio-natural gas; after the fermentation, the fermentation residue is separated from solid and liquid and dried, and the moisture content is controlled at 50%...

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Abstract

The invention provides a method for preparing biogas and a soil conditioner by utilizing stevia rebaudiana processing waste. The method mainly comprises the following steps: pre-treating waste liquid in the stevia rebaudiana processing process; and then mixing the pre-treated waste liquid and waste residues, and fermenting the mixture in an anaerobic jar. The prepared methane, namely biogas, can be applied to industry or households, and the fermented waste residues are applicable to preparation of soil conditioners. According to the method, in the adopted reacting raw materials, the waste liquid can be waste liquid generated in each procedure in the stevia rebaudiana processing process, and the waste residues can be waste residues generated in each procedure of the stevia rebaudiana processing process. The process of the method is relatively simple and easy to operate, waste resources can be effectively recycled, and energization can be realized.

Description

technical field [0001] The invention relates to a method for processing and preparing biomass waste into secondary energy, in particular to a method for preparing biogas and soil conditioner by using stevia processing waste. Background technique [0002] Stevia is a perennial herb of Compositae. The leaves contain steviol glycosides. Its sweetness is 150-300 times that of sucrose, and its calories are only 1 / 300 of sucrose. It is an excellent natural sweetener. Steviol glycoside is a sweetener that has been approved by the health departments of many countries. Its natural calorific value is low and its taste is very close to that of sucrose. It is the third sweetener with development value and health praise after sugarcane and beet sugar. Known as "the third sugar source in the world". Steviol glycoside products are widely used in beverages, food, medicine, wine making, tobacco and daily chemicals, etc., and are ideal for those who avoid sugar such as diabetes, obesity, car...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12P5/02C09K17/40
CPCY02E50/30
Inventor 袁振宏邢涛孙永明甄峰孔晓英李连华
Owner GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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