Quick starting method for producing biogas through anaerobic fermentation of municipal sludge

An urban sludge and quick-start technology, applied in the field of solid waste recycling, can solve the problems of high start-up cost, difficulty in start-up, and high cost of inoculation mud transportation, and achieve the effect of shortening the start-up period and ensuring system stability.

Active Publication Date: 2012-10-03
TONGJI UNIV
View PDF3 Cites 9 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a kind of municipal sludge for the problems of difficult start-up, high start-up cost and long start-up period caused by the strict living environment of methanogens and high transportation cost of inoculum sludge during the start-up process of municipal sludge anaerobic fermentation. A quick start-up method for biogas production by anaerobic fermentation

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Example 1: The effective volume of the anaerobic reactor is 20L, the external interlayer is fed with tap water, the heating method is electric heating, and the temperature control method is material temperature control, so that the material temperature is stabilized at 35±1°C. The experimental stirring shaft is a horizontal double helix stirring shaft. The stirring method is intermittent stirring, the speed is 10~20r / min, and the stirring time of the stirring motor is 8-16 hours per day. Take the anaerobic digestion sludge from sewage plant A to reduce its water content to about 90%, and take 5kg of sludge and add it to the reactor. The initial "effective microbial mass" can be calculated from the organic matter content of the inoculum sludge, and the corresponding quality of urban sludge is added according to a fixed ratio of 10%, and then the "effective microbial mass" is calculated according to the formula (1) every day. "Add the corresponding quality of municipal s...

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

The invention relates to a quick starting method for producing biogas through anaerobic fermentation of municipal sludge. Anaerobic fermentation used as an effective recycling method is widely utilized in the world, but methanogens have high requirements in environment and are long in generation cycle, and according to the starting stage of an anaerobic digestion system, 3 to 8 months or even more time is usually needed. The invention provides the quick starting method according to the anaerobic fermentation of the municipal sludge, only 50 days is needed in the starting process, and the gas production and the content of methane are normal, and volatile fatty acids are prevented from being accumulated. The method comprises the specific steps of: adding anaerobic sludge used as inoculation sludge in an amount which is 10 to 15 percent based on the effective volume of an anaerobic reactor into the anaerobic reactor, feeding materials every day and not discharging, wherein according to a feeding strategy, effective microbial biomass of each day in the reactor is calculated, and starting a fermentation system every day in a feeding ratio, wherein the feeding ratio of matrix to the effective microbial biomass is always 10 percent. Experiments prove that by the method, the anaerobic reactor for the sludge can be quickly started.

Description

technical field [0001] The invention belongs to the field of solid waste recycling, and in particular relates to a quick start-up method for producing biogas by anaerobic fermentation of urban sludge. Background technique [0002] Urban sewage treatment plants produce a large amount of excess sludge due to the purification of domestic sewage. At present, the annual collection capacity is about 26 million tons (calculated at a moisture content of 80%). Sewage treatment plants mostly use sludge for treatment and disposal. The landfill method after concentration and dehydration not only occupies limited land resources, but also easily causes secondary pollution, which is not in line with the strategic principles of sustainable development in my country. In recent years, the global energy structure is undergoing a transition from fossil energy-based to the coexistence of multiple energy sources, and issues such as food security and environmental degradation have become increasing...

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 Applications(China)
IPC IPC(8): C02F11/04
CPCY02E50/343Y02E50/30
Inventor 董滨沙超段妮娜戴翎翎戴晓虎
Owner TONGJI UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap