Enhancing Waste Stabilization and Methane Production in Simulated Landfill by Co-Digestion and Combined Anaerobic Digester

Name: Nirawan Sanphoti

keyword: Combined Anaerobic Reactors

Abstract: The overall aim of this research was to enhance solid waste decomposition and methane production in simulated tropical landfills with two main objectives: 1) to develop and compare the MSW treatment processes between co-digestion and combined anaerobic digester in simulated landfill operated with leachate recirculation; and, 2) to study the MSW degradation and methane production rate in simulated landfill to optimize process design and operation and for process control. The study of the anaerobic co-digestion results indicated that the optimum proportion of organic waste and sewage sludge was 60:40 since it showed the highest performances of the anaerobic co-digestion reactor in terms of hydrolysis yield (93.40 gCOO/kg OM of Mixture), acid yield (53.58 gTVA as AAlkg OM of Mixture), shortened lag phase time (32 days), maximum methane composition (58.91 %), and methane production rate (1.12 IC~/kg OM/d). A significant finding emphasized the meaning ofthe optimum amount of methanogens seeding into organic MSW helped to balance the microbial groups and waste decomposition could proceed without an acid accumulation problem, resulting in the rapid entrance into waste stabilization. The findings from enhancing waste decomposition and methane production in simulated landfill using combined anaerobic reactors revealed that the accumulative acids formed in the leachate were removed and treated by an anaerobic fixed-film reactor. The treated leachate when circulated back to the simulated bioreactor landfill help accelerate waste decomposition and methane production by providing buffer capacity as well as diluting organic content in the leachate. Then favorable conditions for acidogen and methanogen were achieved; consequently, entered rapidly into the methanogenesis phase. It was found that the simulated landfill reactor, which combined to the anaerobic fixed-film reactor, provided 96.33 % of SCOD removal with a methane production rate and yield of 12.60 IC~lkg DM/d and 136.65 IC~lkg DM, respectively. The results of seasonal influence on emission behavior of simulated tropical landfill operated with leachate recirculation showed that there were no different effects of seasonal change with regard to methane production and leachate characteristics among the three reactors. This was attributed to the difference of season was simulated when the waste had already reached the stabilization and the storage leachate showed that only hardly biodegradable organic carbon remained. The finding in this study revealed that in the stabilized landfill where its organic matter had already been exhausted or only hardly biodegradable organic carbon remained, both recycling of stabilized leachate and seasonal variation had no effect on the leachate characteristics and methane production. Focusing on the application aspects of these two techniques in the landfills of Thailand, with the results obtained from this research, both the anaerobic co-digestion by mixing organic MSW with sewage sludge and the combined anaerobic reactors showed the feasibility of applying this to the landfills ofThailand.

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

Address: BANGKOK

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

Name: Sirintomthep Towprayoon

Role: Advisor

Created: 2553-01-31

Modified: 2553-01-31

Issued: 2553-01-31

วิทยานิพนธ์/Thesis

application/pdf

CallNumber: JGSEE139

tha

DegreeName: Doctor of Philosophy

Level: Doctoral Degree

Descipline: Environmental Technology

Grantor: King Mongkut's University of Technology Thonburi

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