UGsymCPE - 2019http://dl.lib.uom.lk/handle/123/176982024-03-29T07:49:57Z2024-03-29T07:49:57ZUndergraduate Research Symposium Chemical and Process Engineering 2019 (Pre Text)http://dl.lib.uom.lk/handle/123/212632023-10-13T02:35:58Z2019-01-01T00:00:00ZUndergraduate Research Symposium Chemical and Process Engineering 2019 (Pre Text)
Rathnasiri, PG
2019-01-01T00:00:00ZVariation of antioxidant and phenolic compounds with fermentation of Morinda citrifolia fruit juiceSamarasiri, BMHChandrasiri, PDTAGunawardena, SHPhttp://dl.lib.uom.lk/handle/123/177702022-06-21T08:41:48Z2019-01-01T00:00:00ZVariation of antioxidant and phenolic compounds with fermentation of Morinda citrifolia fruit juice
Samarasiri, BMH; Chandrasiri, PDTA; Gunawardena, SHP
Rathnasiri, PG
Antioxidant capacity (AC) and total phenolic content (TPC) are two major areas of studies on noni juice due to their correlation with therapeutic value. In this study, the variation of antioxidant capacity using DPPH scavenging activity and the number of phenolic compounds in noni juice using Folin-Ciocalteau reagent assay with the fermentation time and optimum process conditions for fermentation of noni juice were studied. Results show that AC is maximum around the second fermentation week, while TPC is maximum around the first fermentation week, and fresh juice has less AC and more TPC than fermented juice.
2019-01-01T00:00:00ZUse of microaeration to remove sulfur from sulfate rich latex wastewaterDissanayake, DMKNLMaduwanthi, MDTRajapaksha, TMRathnasiri, PGhttp://dl.lib.uom.lk/handle/123/177692022-06-21T08:41:48Z2019-01-01T00:00:00ZUse of microaeration to remove sulfur from sulfate rich latex wastewater
Dissanayake, DMKNL; Maduwanthi, MDT; Rajapaksha, TM; Rathnasiri, PG
Rathnasiri, PG
Latex processing industry generates wastewater with high sulphate content which is converted into hydrogen sulphide in an anaerobic digester. Disposal of this latex wastewater has created severe environmental and health hazard. This study develops a strategy to remove sulphate by performing microaeration. Two lab scale anaerobic reactors were operated, as fully anaerobic and anaerobic with microaeration. These reactors are semi-continuously fed with synthetic latex wastewater contains COD/SO4-2 ratio of 3. After the stabilization, oxygen loading conditions as 4, 6, 7 mg/day were performed stepwise to enable the microaeration condition without inhibition. Bio gas composition, COD, SO4-2, S-2, H2S and oxygen reduction potential (ORP) are the measured parameters.
2019-01-01T00:00:00ZTextile dye decolorization & bioelectricity generation in a microbial fuel cellImalsha, DTKumari, WMSSWalawege, OEGunawardena, SHPAriyadasa, TUhttp://dl.lib.uom.lk/handle/123/177682022-06-21T08:40:59Z2019-01-01T00:00:00ZTextile dye decolorization & bioelectricity generation in a microbial fuel cell
Imalsha, DT; Kumari, WMSS; Walawege, OE; Gunawardena, SHP; Ariyadasa, TU
Rathnasiri, PG
Microbial fuel cells (MFC) have been gained a considerable attention during past few decades due to its ability to treat wastewater effluents while generating bioelectricity. In this study anode to cathode area ratio was varied to maximize the output voltage simultaneously achieving the required color reduction. The highest voltage was observed as 515mV from anode to cathode area ratio of 3:1 on the 7th day from the beginning. At the latter stage, all arrangements show more than 85% color reduction at 200h. Therefore, it can be concluded that electrode area ratio has no significant effect for the fractional color reduction.
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