Method for producing biogas by aid of intensified anaerobic fermentation of pretreated circular backflow sludge
A technology of circulating reflux and anaerobic fermentation, applied in the field of solid waste recycling, can solve the problems of anaerobic fermentation process not receiving attention, limiting the technical advantages of anaerobic digestion, long sludge residence time, etc., and shortening anaerobic fermentation. cycle, promoting sludge recycling, and shortening residence time
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Method used
Image
Examples
Embodiment 1
[0028] figure 1 A flow chart showing the method for alkaline hydrolysis treatment of circulating reflux sludge intensified anaerobic fermentation to generate biogas according to the present invention.
[0029] Take the concentrated sludge and dewatered sludge from a sewage treatment plant in a certain place and prepare mixed sludge with a water content of 92% and a VS / TS of 0.45 in a sludge blending tank. The daily normal input and output are as follows: Take 1L of the above mixed sludge and put it into a 20L effective volume fermenter (the corresponding sludge residence time is 20d), and at the same time discharge 1L into the sludge collection tank. In addition, a circulation outlet is set at the lower end of the fermenter, and 1L (reflux ratio is 5%) of cooked mud is reflowed by gravity to the alkaline hydrolysis regulating device every day, and NaOH is added under the stirring condition of 120rpm, and the dosage of NaOH is 0.05g / gVS. After reacting for 2 hours, add hydro...
Embodiment 2
[0033] Take the concentrated sludge and dewatered sludge from a sewage treatment plant in a certain place and prepare mixed sludge with a water content of 98% and a VS / TS of 0.75 in a sludge blending tank. The daily normal input and output are as follows: Take 2L of the above mixed sludge and put it into a 60L effective volume fermenter (corresponding to a sludge residence time of 30d), and at the same time discharge 2L into the sludge collection tank. In addition, a circulation outlet is set at the lower end of the fermenter, and 4L cooked mud (reflux ratio is 6.7%) is reflowed to the alkaline hydrolysis regulating device by gravity every day, CaO is added under the stirring condition of 120rpm, and the dosage of CaO is 0.010g / gVS. After reacting for 6 hours, add hydrochloric acid to adjust the pH to 7.5, and then pump it into the fermenter through the sludge circulation pump through the circulation feed port. The gas is collected through the biogas digester every day, and ...
Embodiment 3
[0038] Take the concentrated sludge and dewatered sludge from a sewage treatment plant in a certain place and prepare mixed sludge with a moisture content of 88% and a VS / TS of 0.33 in a sludge blending tank. The daily normal input and output are as follows: take 800mL of the above mixed sludge and put it into a 20L effective volume fermenter (the corresponding sludge residence time is 25d), and at the same time discharge 800mL into the sludge collection tank. In addition, a circulation outlet is set at the lower end of the fermenter, and 2L of cooked mud (reflux ratio is 10%) is reflowed to the alkaline hydrolysis regulating device by gravity every day, and Ca(OH) is added under the stirring condition of 120rpm 2 , Ca(OH) 2 The dosage is 0.15g / gVS. After reacting for 4 hours, add hydrochloric acid to adjust the pH to 7.5, and then pump it into the fermenter through the sludge circulation pump through the circulation feed port. The gas is collected through the biogas digeste...
PUM
Abstract
Description
Claims
Application Information
- R&D Engineer
- R&D Manager
- IP Professional
- Industry Leading Data Capabilities
- Powerful AI technology
- Patent DNA Extraction
Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.
© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com