Unlock instant, AI-driven research and patent intelligence for your innovation.

A method of combined pretreatment of calcium oxide and biogas slurry to improve the gas production performance of anaerobic digestion of rice straw

A technology of rice straw and anaerobic digestion, which is applied in fermentation, waste fuel, etc., can solve the problems of refractory degradation, high pretreatment cost, and low production capacity and profit, so as to improve the degradation rate of lignin, save pretreatment cost, and save operation cost effect

Active Publication Date: 2021-07-20
BEIJING UNIV OF CHEM TECH
View PDF5 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Aiming at the problems of refractory degradation, high pretreatment cost and low production capacity and profit in the anaerobic fermentation process, the present invention is proposed

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A method of combined pretreatment of calcium oxide and biogas slurry to improve the gas production performance of anaerobic digestion of rice straw
  • A method of combined pretreatment of calcium oxide and biogas slurry to improve the gas production performance of anaerobic digestion of rice straw
  • A method of combined pretreatment of calcium oxide and biogas slurry to improve the gas production performance of anaerobic digestion of rice straw

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Get 45 parts of weight and be 40g rice straw stalk (in TS), use 6%, 8%, 10%, 12% (calculate in rice straw TS) calcium oxide (calculate in pure calcium oxide molecule) and 5%, 10%, 15% % (calculated by total solid concentration) biogas slurry pretreatment solution was added to 45 parts of rice straw at the same time, sealed, and pretreated at 35° C. for 3 days.

[0027] After the pretreatment, add 12g (in terms of MLSS) sludge from the anaerobic digester of a sewage treatment plant in normal operation as an inoculum, add it to a 1L blue-cap reactor, and add tap water to 80% of the reactor volume. Put the sealed reactor into a 35°C constant temperature water bath for 50 days, and shake it once a day. The daily gas production is recorded by the drainage method, and the percentage of methane is measured every day.

[0028] Calculate the total gas production and total methane production after the experiment, and then calculate T 80 and methane production rate. Measure VS,...

Embodiment 2

[0040] Get 36 parts by weight and be 40g rice straw (calculated in TS), add 10% (calculated in rice straw TS) calcium oxide (calculated in pure calcium oxide molecule) and 10% (calculated in total solid concentration) biogas slurry pretreatment solution simultaneously 36 parts of rice straw were sealed and pretreated at 5°C, 20°C, and 35°C for 1d, 2d, 3d, and 4d, respectively.

[0041] After the pretreatment, add 12g (in terms of MLSS) sludge from the anaerobic digester of a sewage treatment plant in normal operation as an inoculum, add it to a 1L blue-cap reactor, and add tap water to 80% of the reactor volume. Put the sealed reactor into a 35°C constant temperature water bath for 50 days, and shake it once a day. The daily gas production is recorded by the drainage method, and the percentage of methane is measured every day.

[0042] Calculate the total gas production and total methane production after the experiment, and then calculate T 80 and methane production rate. M...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

A method for improving the gas production performance of anaerobic digestion of rice straw through combined pretreatment of calcium oxide and biogas slurry belongs to the field of anaerobic digestion of organic solid waste. The steps of the present invention: calcium oxide is dissolved in the biogas slurry; after the straw is pulverized, it is evenly stirred with the mixed pretreatment reagent, and the total solid concentration is 5%-15%; the mixture is placed in a closed container and pretreated in a thermostat at 5-35°C 1‑4d; Inoculate anaerobic digested sludge, adjust pH, add water to dilute, and carry out mesophilic anaerobic fermentation process. (1) The pretreatment time of the present invention is obviously shortened, and the pretreatment efficiency is increased by 200%. (2) The lignin degradation rate of pretreated straw was significantly improved, and the highest lignin degradation rate of rice straw was 62.13%. (3) The anaerobic fermentation cycle was significantly shortened. (4) The methane production of straw increased significantly after anaerobic digestion. Compared with the single chemical pretreatment method and biological pretreatment method, the present invention can obtain a maximum extra profit of 712.50 yuan / t of straw, which not only improves the gas production performance of rice straw anaerobic digestion, but also greatly improves the production capacity and profit of biogas projects.

Description

technical field [0001] The invention belongs to the field of anaerobic digestion of organic solid waste, and in particular relates to a method for improving the gas production performance of anaerobic digestion of rice straw through combined pretreatment of calcium oxide and biogas slurry. Background technique [0002] my country is a traditional large agricultural country, with an annual output of more than 800 million tons of crop straw, including 180-270 million tons of rice straw. Because they cannot be used effectively in a timely manner, most straws are burned in the open air or stacked in the wild, which seriously pollutes the atmospheric environment and wastes resources. Anaerobic digestion technology has been proved to be an important method to effectively obtain biomass energy, and has the advantages of low energy consumption and high production capacity. It has been widely industrialized and demonstrated in my country. [0003] Anaerobic fermentation using straw ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C12P5/02
CPCC12P5/023Y02E50/30
Inventor 袁海荣管若琳李秀金刘研萍左晓宇
Owner BEIJING UNIV OF CHEM TECH