| Optimization of direct filtration by Sawang Notthakun Academic Program/FoS: Environmental Engineering and Management (EV) |
| Optimization of dual media filter by Bari, Abdul Jabbar Academic Program/FoS: Environmental Engineering and Management (EV) |
| Optimization of electrochemical disinfection technology for the treatment of liquid effluent from onsite sanitation systems by Araya Wicheansan Academic Program/FoS: Environmental Engineering and Management (EV) |
| Optimization of polymer dosage and rotating mesh screen operational conditions for solids-liquid separation of faecal sludge from a vacuum truck by Kamontip Kongsanit Academic Program/FoS: Environmental Engineering and Management (EV) |
| Optimization of polymer dosage and rotating mesh screen operational conditions for solids-liquid separation of faecal sludge from a vacuum truck by Kamontip Kongsanit Academic Program/FoS: Environmental Engineering and Management (EV) |
| Optimization of solid waste collection system for Bangkok City, Thailand by Rangsan Pinthong Academic Program/FoS: Environmental Engineering and Management (EV) |
| Optimization of the operating parameters for continuous partial nitrification process by Sinha, Banashri Academic Program/FoS: Environmental Engineering and Management (EV) |
| Optimization of wastewater treatment and sludge disposal systems : a package for micro-computer application by Viswanath, Arun Academic Program/FoS: Environmental Engineering and Management (EV) |
| Optimizing dry anaerobic digestion of organic fraction of municipal solid waste by Juanga, J eanger P. Academic Program/FoS: Environmental Engineering and Management (EV) |
| Optimizing membrane distillation process for triethylene glycol separation from gas separation plant waste stream by Pham Minh Duyen Academic Program/FoS: Environmental Engineering and Management (EV) |
| Optimum conditions for the contact stabilization process by Murng, Sai Naw Academic Program/FoS: Environmental Engineering and Management (EV) |
| Optimum siting of ambient air monitors by Modak, Prasad M. Academic Program/FoS: Environmental Engineering and Management (EV) |
| Organic and ammonia nitrogen removal suspended solids settling and sludge stabilization using compact rotating biological contactor-settling tank system by Loy, Teck-suan Academic Program/FoS: Environmental Engineering and Management (EV) |
| Organic composition of landfill leachate and factors affecting biodegradability : case study of a young landfill by Qin, Xiaoning Academic Program/FoS: Environmental Engineering and Management (EV) |
| Organic farming and soil indicators for prediction of environmental impact by Chan Let Mon Academic Program/FoS: Environmental Engineering and Management (EV) |
| Osmostic microbial fuel cell (OSMFC) for activated sludge condensing and stabilization with bioelectricity generation by Aye Pyae Pyae Aung Academic Program/FoS: Environmental Engineering and Management (EV) |
| Oxygen transfer mechanism in rotating contactors by Lo, Yee Kin Academic Program/FoS: Environmental Engineering and Management (EV) |
| Oxygenation capacity of water hyacinths by Sundaram, Ravi Vishnempet Academic Program/FoS: Environmental Engineering and Management (EV) |
| Ozonation combined with membrane bio-reactor for landfill leachate treatment by Alia Chaturapruek Academic Program/FoS: Environmental Engineering and Management (EV) |
| Ozone as disinfectant by Tapas, Arturo L. Academic Program/FoS: Environmental Engineering and Management (EV) |