Direct methane fluxes in aquatic sediments : mesocosm study | |
| Author | Dissanayake Musiyanselage Niranjala Anjala Dissanayake |
| Call Number | AIT Thesis no.EV-23-16 |
| Subject(s) | Greenhouse gases--Environmental aspects Methane--Environmental aspects Contaminated sediments |
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Science in Environmental Engineering and Management |
| Publisher | Asian Institute of Technology |
| Series Statement | Thesis ;no. EV-23-16 |
| Abstract | Globally, there are millions of kilometres of canal systems, are potential source of CH4 emissions which are largely remain uncovered under the inland water or drained lands. This study highlights the, a) fluctuation of CH4 flux in a canal system along with the seasonal variation and water quality parameters, b) impact of the addition of CH4 producing and oxidizing substances and, c) average amounts of CH4 flux through diffusion and ebullition. The study was conducted in an artificial canal located in Asian Institute of Technology, Pathum Thani, Thailand. Two methane-capturing techniques were used; floating chamber and mesocosm. The results of the study was supported by a comprehensive review on the impact of the microbial diversity for the CH4 flux of an aquatic sediment. The results showed a strong significant positive correlation between CH4 flux and the seasonal variation, was recorded a 4.02 g/d.m2 and of highest during hot season and 0.00 g/d.m2 of lowest during wet season. There were negative correlation between CH4 flux and, pH, DO, nitrite, nitrate, ammonium, sulfate, and total organic carbon. Contrariwise, positive correlations were found with water temperature, total Kjeldahl nitrogen, and total phosphorus. The introduction of acetate increased CH4 flux, while the presence of nitrite and nitrate led to its reduction. Using floating chambers and mesocosm, annual CH4 flux through ebullition and diffusion during the hot season was estimated at 96% (2334.71 g/yr.m2) and 4% (92.51 g/yr.m2), respectively. Methane emission from the aquatic sediment was found to be influenced by methanogenic archaea, cyanobacteria, and methanotrophic bacteria, and is affected by numerous factors. Based on the study findings, sustainable drainage management, the establishment of green canopies along canal systems, and continuous monitoring of water quality are recommended as key measures for mitigating CH4 emissions from canal systems. |
| Year | 2023 |
| Corresponding Series Added Entry | Asian Institute of Technology.Thesis ;no. EV-23-16 |
| Type | Thesis |
| School | School of Environment, Resources, and Development (SERD) |
| Department | Department of Energy and Climate Change (Former title: Department of Energy, Environment, and Climate Change (DEECC)) |
| Academic Program/FoS | Environmental Engineering (EV) |
| Chairperson(s) | Cruz, Simon Guerrero |
| Examination Committee(s) | Ekbordin Winijkul;Shanmugam, Mohana Sundaram |
| Scholarship Donor(s) | Her Majesty the Queen's Scholarships (Thailand) |
| Degree | Thesis (M. Sc.) - Asian Institute of Technology, 2023 |