The development of anaerobic digestion, using market waste for energy purposes

Name: Cheevanuch Tubtong

keyword: Sequential batch anaerobic reactor

Abstract: In this thesis, the development of a process usmg anaerobic digestion to treat market waste was undertaken. Three experiments were carried out, in order to enhance methane production and to overcome the acid accumulation problem, which usually occurs at the begirming of market waste degradation, resulting in a failure to enter into the methanogenesis phase. The first experiment characterized the effect on degradation processes, when four different sizes of waste (0.5, 1.0, 2.0 and 4.0 cm) were degraded in reactors employing self-recirculation of leachate. The results of this experiment showed that the degradation of some easily biodegradable components in the market waste can proceed rapidly, and cause acid accumulation in the system, regardless of the size of market waste. No methane production occurred in the four reactors, even though the alkalinity and pH were adjusted. The results of experiment 2 showed the effectiveness of a Sequential Batch Anaerobic Reactor (SEBAR) system, fed with market waste, using both active and stabilized (Control) support reactors. The introductions of a buffering agent and microorganisms to the new reactor, by leachate recirculation from the support reactor in the SEBAR system, helped the newly fined reactor to overcome the initial acid accumulation problem, enabling the creation of favorable conditions for methane production. Comparison of the two different support reactors showed that the active reactor promoted faster waste degradation and methane production in the new reactor, than did the control reactor. In addition, using a SEBAR process with an active support reactor can shorten the SEBAR cycle period by 50%, while still achieving 75% of methane yield, obtained using the control reactor. This reduced cycle time enables the active SEBAR system to produce a higher methane yield per day (0.0044 L.CH4g.VS added in the NEW reactor/day) than the conventional system (0.0029 L.CH4g.VS added in the NEW reactor/day). In experiment 3, the effect of increasing the leachate recirculation rate on the performance of a SEBAR system, using an active support reactor, was investigated. It was found that increasing the recirculation rate, accelerated the onset of both waste degradation and methane production. The increasing of the recirculation rate from 10% to 20010 and 10% to 30010, could reduce the SEBAR cycle period by approximately 7% and 22%, without significant reduction in the amount of methane obtained from the systems. The methane yields were 0.0063, 0.0068 and 0.0077 L. CR4/g. VS, added in the NEW reactor/day, using leachate recirculation rates of 10%, 20% and 30%, respectively. This finding has potentially important practical and economic implications, for those using the SEBAR system to valorize market waste.

King Mongkut's University of Technology Thonburi. KMUTT Library.

Address: BANGKOK

Email: info.lib@mail.kmutt.ac.th

Name: Sirintornthep Towprayoon

Role: Advisor

Created: 2007

Modified: 2553-10-27

Issued: 2010-10-23

วิทยานิพนธ์/Thesis

application/pdf

CallNumber: JGSEE217

eng

DegreeName: Doctor of Philosophy

Level: Doctoral Degree

Descipline: Environmental Technology

Grantor: King Mongkut's University of Technology Thonburi

©copyrights King Mongkut's University of Technology Thonburi

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