Browsing by Author "Dilrukshi, RAN"

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    item: SRC-Report
    Feasibility studies of a constructed wetland to treat contaminated water
    Weerasooriya, UK; Dilrukshi, RAN; Adikari, AMHV; Rajeeth, A; Achchuthan, P; Karunarathne, S
    Among the vast number of methods that can be applied for the treatment of contaminated water, mine water was identified one of the best methods of treating of abandoned as the subsurface flow constructed wetlands through pytoextraction. Therefore further research was carried out to the applicability of constructed wetland to treat polluted water at abandoned quarry in Ragama (Prison Quarry). The main objective of the study was to measure the removal efficiencies of BOD, COD, NH3, NO3", PO43" using Thypha Latifolia (Cattail). The hydraulic retention time was 8 days. The concentration of Nitrate, Orthophosphate and Ammonia was monitored twice a week and BOD and COD were monitored once a week in order to determine their removal rates. While monitoring the removal efficiencies, the mechanisms of N, P and COD removals were identified. The mechanisms are based on the principle of mass conservation. The main nitrogen removal mechanisms identified were plant uptake and denitrification. It is assumed that ammonia and nitrate removal from wetlands by macropytes depended on the biomass of the roots. Average Nitrate and Ammonia removal from the planted cell was 42.9% and 27.8%, respectively, whereas the removal efficiency of Ortho Phosphate was 17.5% in the planted tank. Typha latifolia was identified as a suitable wetland plant which can remove nitrogen compounds in contaminated water.
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    item: Article-Full-text
    Feasibility studies of a constructed wetland to treat contaminated water
    Weerasooriya, UK; Dilrukshi, RAN; Adikari, AMHV; Rajeeth, A; Achchuthan, P; Karunarathne, S
    Among the vast number of methods that can be applied for the treatment of contaminated water, one of the best methods of treating of abandoned mine water was identified as the subsurface flow constructed wetlands through pytoextraction. Therefore further research was carried out to the applicability of constructed wetland to treat polluted water at abandoned quarry in Ragama (Prison Quarry). The main objective of the study was to measure the removal efficiencies of BOD, COD, NH3, NO3', PO.*3- using Thypha Latifolia (Cattail). The hydraulic retention time was 8 days. The concentration of Nitrate, Orthophosphate and Ammonia was monitored twice a week and BOD and COD were monitored once a week in order to determine their removal rates. While monitoring the removal efficiencies, the mechanisms of N, P and COD removals were identified. The mechanisms are based on the principle of mass conservation. The main nitrogen removal mechanisms identified were plant uptake and denitrification. It is assumed that ammonia and nitrate removal from wetlands by macropytes depended on the biomass of the roots. Average Nitrate and Ammonia removal from the planted cell was 42.9% and 27.8%, respectively, whereas the removal efficiency of Ortho Phosphate was 17.5% in the planted tank. Typha latifolia was identified as a suitable wetland plant which can remove nitrogen compounds in contaminated water.
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    item: Conference-Full-text
    Feasibility studies of a constructed wetland to treat contaminated water
    (Department of Earth Resources Engineering, 2008-05) Weerasooriya, UK; Dilrukshi, RAN; Adikari, AMHW; Rajeeth, A; Achchuthan, P; Karunarathne, S; Karunaratne, S
    Among the vast number of methods that can be applied for the treatment of contaminated water, mine water was identified one of the best methods of treating of abandoned as the subsurface flow constructed wetlands through pytoextraction. Therefore further research was carried out to the applicability of constructed wetland to treat polluted water at abandoned quarry in Ragama (Prison Quarry). The main objective of the study was to measure the removal efficiencies of BOD, COD, NH3, NO3", PO43" using Thypha Latifolia (Cattail). The hydraulic retention time was 8 days. The concentration of Nitrate, Orthophosphate and Ammonia was monitored twice a week and BOD and COD were monitored once a week in order to determine their removal rates. While monitoring the removal efficiencies, the mechanisms of N, P and COD removals were identified. The mechanisms are based on the principle of mass conservation. The main nitrogen removal mechanisms identified were plant uptake and denitrification. It is assumed that ammonia and nitrate removal from wetlands by macropytes depended on the biomass of the roots. Average Nitrate and Ammonia removal from the planted cell was 42.9% and 27.8%, respectively, whereas the removal efficiency of Ortho Phosphate was 17.5% in the planted tank. Typha latifolia was identified as a suitable wetland plant which can remove nitrogen compounds in contaminated water.
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    item: Thesis-Abstract
    Predicting Los Angeles abrasion of rocks in Sri Lanka from some physical and mechanical properties of rock
    (2015-03-01) Dilrukshi, RAN; Puswewala, UGA
    As urbanization and development rapidly increase, the demand for high quality aggregates becomes progressively higher. Thus quality controlling of rock aggregates is a major concern in construction industry. The engineering properties of different rock types in Sri Lanka are not the same and therefore the suitability of rock aggregates should be investigated prior to use for construction works. The cost and time implication of the quality control process is becoming a concern from the entrepreneurial point of concern. Cost and time of quality controlling can be minimized via finding correlations between different tests on aggregates and rocks. Laboratory studies were carried out to investigate the existence of relationship between LAAV and AIV, ACV, TFV, UCS, Point Load Index (PL), Specific Gravity (SG), Water Absorption (WA), Methylene Blue Absorption (MBA) and soundness parameters of the rocks in Sri Lanka. Fresh rock samples of different rock types were collected from quarries operating in various locations and exposed rocks in different localities within Sri Lanka to correlate each parameters. Results from different rock types were analyzed separately using EXCEL by the means of least square regression methods. A linear relationship between LAAV and AIV was found with R2 value of 0.7728 for Biotite Gneiss rock and exponential relationship between LAAV and AIV was found with R2 value of 0.6609 for Charnokite/Charnokitic Gneiss rock. Relationships between LAAV and ACV for Biotite Gneiss and impure marble as well as relationships between LAAV and PL and LAAV and TFV for Biotite Gneiss were obtained with significant R2values. Strong relationship could not be obtained between LAAV and Soundness, MBA, SG and WA. Key words: Quality controlling, LAAV, Correlations, EXCEL, regression methods