Water, Environment & Energy

Wastewater Treatment by Membrane Aerated Biofilm Reactor (MABR)
Speaker: Buddhima Siriweera
Registration Fee: FREE
Language: English
Time Length: ~60 Min
To Register: Registration Form
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Description: Membrane Aerated Biofilm Reactor (MABR), is a recently developed biofilm technology which provides simultaneous nitrification and denitrification in a single unit. Membrane acts as a carrier to immobilize the bacteria as well as the means of oxygen supply to the bacteria in the biofilm formed on the membrane surface. Due to the air diffusion mechanism used in MABR, it provides higher savings of the energy with compared to the activated sludge process. One of the major hindrances for upgrading MABR is the low total nitrogen removal efficiencies reported at low hydraulic retention times. According to a bench scale MABR study, it is possible to enhance total nitrogen removal from synthetically prepared wastewater via the immobilization of de-nitrifiers in polyvinyl alcohol (PVA) gel bio-carriers. Efforts have been taken for the application of this modification for pilot scale MABR systems in real life applications.

Policy Interventions for the Establishment of a Stormwater-Integrated Dewatering System in Malé City, Maldives
Speaker: Fathmath Shafa-Ath Ibrahim Nasih
Registration Fee: FREE
Language: English
Time Length: ~60 Min
To Register: Registration Form
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Description: The high water table of Malé City requires dewatering of construction sites in order to allow for foundation works. Additionally, Malé City is vulnerable to excessive and extended flooding especially during monsoon season. The research aimed to provide long-term solutions to issues in stormwater and dewatering effluent management within Malé City. Results of a hydrologic model of Malé City including existing stormwater management system created using PCSWMM showed 27 points of flooding with magnitudes between 10-40 ML, out of which 16 fell within flood prone areas highlighted in a public survey of 40 samples. The results made clear that an individual system that combines both stormwater and dewatering effluent is applicable for Malé City, agreed on by 87.5% of survey participants. An economic analysis of water supply tariff of Malé City showed a significantly high average cost of 4.04 USD/m3, while Singapore and Hong Kong had average tariff rates 38% and 23% of this value respectively, highlighting need to incorporate cheaper, energy efficient and sustainable water and wastewater management practices. Based on the findings, the research provided holistic policy recommendations to improve the current situation within stormwater and dewatering effluent management works of Malé City as well as plumbing aspects of the overall water and wastewater sector.
Speaker: Assistant Director, Waste Management and Pollution Control Department, Ministry of Environment, Government of the Republic of Maldives