Proceedings of International Forestry and Environment Symposium最新文献

{"title":"In vitro Screening of Antioxidant and Anti-inflammatory Activities of Plant Extract Adenanthera pavonina","authors":"Wijesekara M.A., Goonerathne L.V., Soysa P., Perera D.B., Jayasena S., Jayasiri A., Kottahachchi D.U.","doi":"10.31357/fesympo.v27.7107","DOIUrl":"https://doi.org/10.31357/fesympo.v27.7107","url":null,"abstract":"Adenanthera pavonina (AP) is a medicinal herb used in traditional systems of medicine in Sri Lanka. It is considered a rich source of bioactive compounds as they are able to produce a great variety of secondary metabolites with great anticancer and antioxidant properties. In the present study, the bark of the plant was used and water extract was prepared in order to screen Total Phenolic Content (TPC), Total Flavonoid Content (TFC), Ferric ion reducing power, DPPH radical scavenging capacity, inhibition of lipid peroxidation, inhibition of protein oxidation and inhibition deoxyribose oxidation. Anti-inflammatory activity was screened in vitro using Human Red Blood cell Membrane stability assay (HRBM) and inhibition of protein denaturation assay. All methods were carried out according to the standard protocol. The TPC and TFC were 80.3±0.1 mg GA/g (Gallic Acid/g) and 46.1±0.1 mg EGCG/g (epigallocatechin gallate /g) respectively. The DPPH radical scavenging capacity, inhibition of lipid peroxidation, protein oxidation and deoxyribose oxidation were IC50, 15.8±0.5 (Gallic acid, 4.5±0.3 μg/ml), 46.1±0.5 μg/ml (Ascorbic acid , 58.4±2.2 μg/ml), 72.6±3.1 μg/ml (Ascorbic acid, 51.2±0.1 μg/ml) and 7.4±0.7 μg/ml (Ascorbic acid, 8.7±0.6 μg/ml) respectively. Reducing power of the AO extract increased with the concentration. HRBM and inhibition of BSA denaturation of AO extract were IC50 that 49.7±1.4 μg/ml (Diclofenac sodium, 47.8±2.1 μg/ml) and 29.1±1.5 (Diclofenac sodium 23.8±3.6 μg/ml) respectively. The results of the study suggest that the bioactive molecules present in the AP water extract can be used as a prototype for the development of new drugs or as a source of antioxidants and anti-inflammatory pharmaceutical raw material. \u0000Keywords: Adenanthera pavonina, Inhibition of lipid peroxidation, Inhibition of protein oxidation, Inhibition deoxyribose oxidation.","PeriodicalId":205644,"journal":{"name":"Proceedings of International Forestry and Environment Symposium","volume":"26 8","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139963315","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A Critical Appraisal of the International and National Legal Framework on Climate Change","authors":"Samaradiwakara H.S.","doi":"10.31357/fesympo.v27.7101","DOIUrl":"https://doi.org/10.31357/fesympo.v27.7101","url":null,"abstract":"\u0000 \u0000 \u0000The decade starting from 2010-2020 was recorded the warmest decade in the history. The new principles such as Climate litigation, climate justice, climate legislation have been catapulted to the forefront of the environmental litigation and environmental laws. As per the United Nations Framework Convention on Climate Change (UNFCC) the human activities is the substantial cause for increasing of Greenhouse gases in the atmosphere which would results in additional warming of the earth‘s surface and the atmosphere and also may adversely affect the natural eco system and human kind. Article 2 of the UNFCCC defines climate change as, a change of climate which is attributed directly or indirectly to human activity that alters the composition of the global atmosphere and which is in addition to natural climate variability observed over comparable time periods. Changes in the physical environment or biota resulting from climate change which have significant deleterious effects on the composition, resilience or productivity of natural and managed ecosystems or on the operation of socio-economic systems or on human health and welfare are the effects of climate change. As a matter of fact climate change is the direct result of global warming and the emission of greenhouse gases to the atmosphere has escalated the earth‘s temperature level. The Resolution adopted by the General Assembly which includes 2030 Agenda for Sustainable Development urges States to take urgent action to combat climate. UNFCC, Kyoto Protocol and Paris Agreement constitute the international legal regime that deals with climate change. These were the results of entering into international consensus in the aim of reducing the greenhouse emission and thereby to effectively handle the climate change impacts. The objective of the paper is centered on the appraisal of the international and national legal framework that have been enacted to curb the climate change. To this end the research paper employs a qualitative methodology. Conventions, Resolutions adopted by the United Nations, legislations such as National Environment Act, Fauna and Flora Act, Coastal Conservation Act etc , policies and regulations, case laws from foreign jurisdiction are utilized as primary sources and the scholarly articles, journals, peer reviewed articles are utilized as secondary sources. The findings of the paper emphasizes that the synergy between the international and national legislations should be strengthen if the legislature is to find prolific solutions to this complex issue. Finally the paper concludes that it must be taken into consideration that if all States are to combat this unprecedented crisis, no instrument can be ignored. \u0000Keywords: Climate change, Climate litigation, Environment, Global warming, Sustainable development \u0000 \u0000 \u0000","PeriodicalId":205644,"journal":{"name":"Proceedings of International Forestry and Environment Symposium","volume":"14 10","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139963338","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Public Opinion Survey on the Status of Waste Management in Sri Lanka","authors":"Ariyasingha U.D.H.P.","doi":"10.31357/fesympo.v27.6570","DOIUrl":"https://doi.org/10.31357/fesympo.v27.6570","url":null,"abstract":"Solid waste and wastewater management is a critical issue in Sri Lanka. Self-administered 18 questions were used for primary data collection covering 1,158 responses within 25 districts randomly. Age groups of the respondents and their contribution (as a percentage) for the survey were; below 18yrs (3.01%), 18-30yrs (90.59%), 30-45yrs (3.17%) and above 45yrs (1.90%). Among the respondents; 75.09% were undergraduates, 8.89% were employed, 6.13% were school students and, 5.76 were in other institutes of higher education. The time period of the survey was from 20th July 2021 to 6th August 2021. Survey was carried out using online platform (google forms). Questioner was developed to acquire information related to; solid waste, water quality (using taste as a parameter), waste disposal, disposal methods, type of wastes collected, were obtained. This was not merely a household survey, but included waste management done by Municipal councils as well. The objectives of this survey were; to find the quality of water in each area of Sri Lanka, to get an idea about household wastes and the availability of methodical waste disposal facilities, and to obtain ideas from the respondents. According to the data obtained from the survey, 83.77% of the respondents claimed that the consumed water doesn‘t contain hardness. Also, 56.30% respondents reuse household wastewater while 54.58% respondents dispose of less than 1kg of waste daily. Open dumping areas don't exist for 78.93% of the respondents, 56.39% of the respondents were aware of land-filling but 8.98 % thought that landfill process was not a good solution for garbage disposal. The disposal of non-degradable wastes to the environment was 50.07%. Burnt and open dumping percentages of household wastes were 34.54% and 10.47% respectively. Waste collection by the municipal councils does not happen systematically according to 55.01% respondents. Garbage recycling centers do not exist for 69.34% respondents. The survey showed that knowledge of waste disposal methods and environmental impacts must be improved. Awareness programs have to be conducted to acknowledge the community. Solutions from the respondents included establishing more sanitary land-filling facilities in necessary areas. Encouraging recycling of waste among the communities by conducting awareness programs about recycling companies that buy separated wastes like plastics, papers, glasses etc. which would provide an additional income.  \u0000Keywords: Solid waste, Wastewater, Disposal, Land-filling, Garbage ","PeriodicalId":205644,"journal":{"name":"Proceedings of International Forestry and Environment Symposium","volume":"28 10","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139963417","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Degradation Potential of Biodegradable Plastics under Laboratory Conditions","authors":"Sandeepani G.D.V.A., Ranatunga R.R.M.K.P.","doi":"10.31357/fesympo.v27.6617","DOIUrl":"https://doi.org/10.31357/fesympo.v27.6617","url":null,"abstract":"Conventional plastics are one of the greatest environmental issues due to their excessive usage and slow degradation. Biodegradable plastics have been introduced as a promising solution to the issue. However, the degradation potential and the best exposure conditions for biodegradable plastics are not well understood in the local context. Therefore, the present study was conducted to evaluate the degradation potential of some commercially available single-use plastics labeled as ―biodegradable‖. Two brands of lunch sheets (LS1 and LS2) made from Polylactic acid (PLA), Polybutylene adipate terephthalate (PBAT), and corn starch, and one waste bag made from Low- density polyethylene (LDPE) and Linear low-density polyethylene (LLDPE) were tested against cellulose filter paper (FP) as a positive control. Degradation was tested using mass loss analysis, biogas production, and FTIR spectrum analysis together with visual analysis. The test materials were subject to different exposures, i.e., placed under seawater, beach sand, freshwater, sand with overlying freshwater, and under direct sunlight for 210 days, and anaerobic exposure for 60 days. LS1 had the highest mass loss of 73.3% in freshwater and the lowest of 9.5% in sunlight exposure. LS2 recorded the highest mass loss of 59.3% in compost exposure and the lowest of 2.9% in sunlight exposure. Waste bags recorded 1.5% as the highest mass loss in the sand with overlying freshwater and the lowest 0.3% under direct sunlight which is the lowest among all four samples. FP has shown the highest and lowest mass loss in composting and direct sunlight exposures at 79.7% and 6.2%. The degradation of FP indicates that the conditions required for biodegradation were present in the exposure environments. Direct sunlight exposure does not show a significant impact on the degradation of any of the test materials. The waste bag does not show considerable degradation under any exposure. The carbon dioxide gas production was 8.76×10-4 mol, 18.49×10-4 mol, and 2.88×10-4 mol in LS1, LS2, and waste bag, respectively. LS1 and LS2 showed visual damages and also changes in the FTIR spectrum. However, waste bags did not show any changes visually or in FTIR spectra. Therefore, it can be concluded that LDPE and LLDPE products did not undergo a detectable degradation though PLA, PBAT, and corn starch products show clear signs of degradation. The study needs to be repeated in situ to better understand the degradation behavior in actual exposure situations.  \u0000Keywords: Biodegradable plastics, Degradation, Plastic pollution ","PeriodicalId":205644,"journal":{"name":"Proceedings of International Forestry and Environment Symposium","volume":"8 6","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139963599","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Analysis of Wastewater Quality after the Reopening of the Faculty of Technology,","authors":"Gunathilake H.M.A.V., Perera W.P.S.N., Malkanthi W.P.M.","doi":"10.31357/fesympo.v27.7199","DOIUrl":"https://doi.org/10.31357/fesympo.v27.7199","url":null,"abstract":"Wastewater is a complex matrix consists of varied pollutants namely particulate matter, microorganisms, dissolved solids, biogeochemical species at significant concentrations. Wastewater treatment brings down the concentration of pollutants to permissible levels. The Technology faculty has approximately 1,600 students and approximately 110 academic and non-academic staff members. We have observed that wastewater from the washroom systems, canteens and water used for cleaning activities are directed to the wastewater treatment plant. The study was conducted to determine the quality of generated and treated wastewater when the faculty functions in full capacity. Upon the treatment of wastewater, these are pumped for the garden water supply of the faculty. In this research, parameters like water pH, temperature, turbidity, dissolved oxygen (DO), chemical oxygen demand (COD), conductivity, total suspended solids (TSS) and temporary hardness of water were analyzed for both influent and effluent. The treatment efficiencies COD, DO, TSS and turbidity were recorded 53%, 41%, 96% and 93% respectively after the wastewater is passed through equalization anaerobic tanks, aeration tank, clarifier, chlorination tank, sand filter and carbon filters. The occurrence of an efficient treatment of wastewater can be concluded and it is recommended to be used for general water usage at the faculty gardening activities.  \u0000Keywords: COD, Dissolved Oxygen, Wastewater treatment ","PeriodicalId":205644,"journal":{"name":"Proceedings of International Forestry and Environment Symposium","volume":"13 8","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139963715","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Chemical Analysis of Kitchen Waste for Developing Formulae for Compost Fertilizer","authors":"Ranasinghe S.D., Prashantha M.A.B., Godakumbura P.","doi":"10.31357/fesympo.v27.6619","DOIUrl":"https://doi.org/10.31357/fesympo.v27.6619","url":null,"abstract":"The rapid growth of the global population and changes in food consumption patterns have resulted in issues relating to food insecurity. Improved strategic solutions are needed to allow easy access to food and also to manage large volumes of waste efficiently. From this research, a microeconomic- level solution to manage the aforementioned issues is addressed. Common kitchen waste such as peels and discarded parts of fruits and vegetables can be combined to produce compost fertilizer. Producing compost fertilizer in this manner can be considered a microeconomic-level waste management strategy. Compost fertilizer produced using kitchen waste can subsequently be used in home gardening. Many vegetables and fruits can easily be cultivated in small, confined spaces such as in home gardens. This study analyzed chemical parameters such as total carbon and other total nutrient levels (N, P, Ca, Mg and K) in ten kitchen waste and two supplementary samples using standard methods. The kitchen waste samples consisted of peels and discarded parts of fruits and vegetables. The two supplementary samples- Tithonia diversifolia (Wild sunflower), and Gliricidia sepium were chosen because they are nutrient-rich organic fertilizers. The analysis results were then fed to a computer program developed for this study. It was based on the simulated annealing algorithm. The program generated different formulae for producing 100 g mixtures of raw materials for composting, by mixing the 10 kitchen waste and 2 supplementary samples in 24 different combinations. The nutrient levels of these mixtures were expected to match or exceed a calculated ―target nutrient level‖. It was calculated based on local compost fertilizer standards and the chemical analysis results. The target nutrient level calculated as the minimum required level by dry mass of each material was 25.00% Carbon, 1.25% Nitrogen, 0.63% Phosphorus, 1.25% Potassium, 0.88% Calcium, and 0.63% Magnesium. The program was able to generate mixtures of raw materials in which most of the levels matched or exceeded the target level. However, the phosphorus levels of all formulae fell below the target phosphorus level and in some mixtures, the magnesium level also was less than the targeted level. The actual nutrient level of one of the 100 g mixtures (combination C3) containing 0.19 g banana stem, 0.21 g discarded tea grounds, 0.41 g discarded scraped coconut, 0.57 g banana peel, and 97.34 g Gliricidia leaves was (% by dry mass), 85.68% Carbon, 2.20% Nitrogen, 0.25% Phosphorus, 1.32% Potassium, 2.24% Calcium and 0.71% Magnesium. This promising method can further be developed by adding more nutrient-rich raw materials to the program. The program could be a useful tool for compost fertilizer manufacturing, especially for small-scale horticultural purposes.  \u0000Keywords: Compost, Waste management, Nutrient analysis, Kitchen waste ","PeriodicalId":205644,"journal":{"name":"Proceedings of International Forestry and Environment Symposium","volume":"14 9","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139962686","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Assessment of the Potential to Promote Nature-based Tourism Industry in the Protected Area Network of Sri Lanka","authors":"Wijethunga A.R.L., Subasinghe D.","doi":"10.31357/fesympo.v27.7114","DOIUrl":"https://doi.org/10.31357/fesympo.v27.7114","url":null,"abstract":"\u0000 \u0000 \u0000 \u0000Promoting the tourism industry is one of the proven strategies for Sri Lanka to address current economic crises. Sri Lanka has a high potential to develop nature-based tourism with its high biodiversity. The Forest Department and the Department of Wildlife Conservation manage 30% of the country's land as Protected Areas. In comparison to the tourism income generated through archeological sites of the country, the biodiversity sector has earned 83%-90% from 2012 to 2016, without any significant promotions and it shows the potential to develop nature-based tourism. This study aimed to examine the potentiality of using the Protected Area network to promote nature- based tourism. The PESTEL approach was utilized to assess the potentiality, and primary data was gathered through ten structured Key Informant Interviews of senior officials of both the destination management agencies, tourism authorities, and experts. The secondary data were obtained by reviewing official reports and records. The Fauna and Flora Protection Ordinance, Forest Ordinance, and their amendments provide legal provisions relating to tourism in Protected Areas with certain limitations. The Wildlife Preservation Fund can be utilized for conservation and development activities in protected areas, including tourism promotion. Even if a higher degree of ̳tourism friendly‘ provisions is available with the Forest Department, there is no mechanism for utilizing the income generated through tourism activities for conservation as revenue credits to the Treasury. Insufficient financial allocation through the treasury, lack of innovative financial solutions for resource mobilization, and ineffective governance mechanisms for promoting public- private partnerships are identified as challenging factors in forest and biodiversity conservation in protected areas. This leads to environmental degradation and biodiversity loss in the country. The study found the potentiality of developing projects worth one billion LKR per annum with more than 20% internal rate of return, if the government develops a mechanism that increases the \u0000 \u0000 \u0000 \u0000 \u0000benefits/incentives available for the Forest Department from tourism, ensures cooperation and \u0000 \u0000 \u0000 \u0000 \u0000comprehensive planning among both the departments, introduce innovative sustainable financing solutions, amend the policy and institutional framework in favour of public, private community partnerships, and develop a tourism promotion roadmap for both the Departments. Such initiatives would increase the socioeconomic and environmental benefits to the communities living in the Functional Resource Unit of the Protected Areas. It could be strengthened with an innovative Protected Area management model such as the community forestry approach. The study recommends that tourism should be considered an effective entry point for sustainable use, biodiversity conservation, and economic growth at local and national levels. \u0000 \u0000 \u0000 \u0000 \u0000Keywords: Protected areas, Nature-b","PeriodicalId":205644,"journal":{"name":"Proceedings of International Forestry and Environment Symposium","volume":"30 3","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139962763","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Awareness of the General Public within the District of Gampaha, Regarding the Biomedical Waste Disposed by Clinical Laboratories and its Consequences","authors":"Perera B.O.L., Peiris P.C., Jayathilake J.M.N.J.","doi":"10.31357/fesympo.v27.7197","DOIUrl":"https://doi.org/10.31357/fesympo.v27.7197","url":null,"abstract":"The Waste management is a primary concern in a clinical laboratory for overall laboratory safety as biomedical wastes generated in medical laboratories are hazardous for humans and the environment. This study aimed to assess the awareness regarding biomedical waste and its consequences among the public in the Gampaha district and to observe the correlation between the level of education with this extent. 150 people between the ages of 18 and 55 years were considered for inclusion criteria, while current, retired, and minor healthcare workers were excluded. The convenience sampling method was used when selecting the target population, and data was collected through online surveys (google forms) with close-ended questionnaires. The age groups have been divided into four major categories: (18-25), (25-35), (35-45) and (45-55). SPSS software was used to analyze and evaluate the results. The results showed that people aged 18-25 years and 45-55 years have a low awareness of biomedical waste and its consequences, whereas people aged 25-35 years have good awareness. Individuals between the ages of 35 and 45 had the highest level of awareness. The responses obtained revealed that the highest level of awareness regarding the biomedical wastes disposed of by clinical laboratories and its consequences was given by 90% of the 35-45 age group, 60% of the 25-35 age group, 58% of the 45-55 age group, and 52% of the 18- 25 age group. Except for a few exceptions, many participants in the 35-45 age groups were educated as most of them had completed their studies at least up to advanced level. Having a doctorate was the highest education level observed in the sample. According to the findings, the analyzed P value was 0.026, with a correlation coefficient of 0.6631 indicating that the results are statistically significant. Therefore, it can be concluded that there is a clear correlation between the levels of education and age regarding the awareness of biomedical waste. Therefore, strengthening the waste management systems and educating the public regarding biomedical waste would be recommended. \u0000Keywords: Biomedical wastes, Awareness, Level of Education, General Public, Gampaha District","PeriodicalId":205644,"journal":{"name":"Proceedings of International Forestry and Environment Symposium","volume":"27 9","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139962772","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Temporal Variation of Water Quality in Nilwala River, Southern Province, Sri Lanka","authors":"Diwyanjalee G.R., Premaratne W.A.P.J.","doi":"10.31357/fesympo.v27.7201","DOIUrl":"https://doi.org/10.31357/fesympo.v27.7201","url":null,"abstract":"This study intended to investigate the temporal variation of water quality of the Nilwala river in the Matara district and to determine how the changes in rainfall affect to river water quality. Water samples were collected monthly from March 2019 to October 2019 (considering the second Inter monsoon season and first inter-monsoon season) at eight locations along the main river. Water quality parameters such as chemical oxygen demand (COD), biological oxygen demand (BOD), pH, electrical conductivity, temperature, alkalinity, hardness, chloride, nitrate and phosphate were analyzed using APHA 23rd edition of standard methods for the examination of water and wastewater. Experimental results were statistically analyzed by Two-way ANOVA using Minitab 17. The pH, EC, temperature, alkalinity and nitrate concentration showed statistically significant differences among the months (p<0.001) and those showed statistically significant differences with monthly rainfall (p< 0.001). There is a statistically significant relationship between rainfall and month (p<0.001). There is a statistically significant relationship between rainfall and sampling location (p<0.001). The highest rainfall was recorded from august to November (2nd inter-monsoon season) and secondly from March to May (1st inter-monsoon season) was recorded. Conductivity, pH and temperature were decreased from March to June. This may due to 1st inter monsoon rainfall. Conductivity was increased during august-november. Flooding can increase conductivity when it washes salts and minerals from the soil into the water. Nitrate concentration in the majority of the locations was increased during march-may. Total alkalinity, pH and nitrate were increased from august to November. The temperature of river water at all locations decreased from august- November. In conclusion, the pH, EC, temperature, alkalinity and nitrate concentration showed statistically significant differences among each month. It may due to variation of rainfall. Upper part of Nilwala River had a higher rainfall than lower basin. \u0000Keywords: Conductivity, Nilwala River, pH, temporal variation, Water quality","PeriodicalId":205644,"journal":{"name":"Proceedings of International Forestry and Environment Symposium","volume":"9 5","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139963134","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Testing the Biodegradability and Biodegradation Rate of Bio-based Film Products in Composting Environment","authors":"Jayaweera C.D., Senadheera S.K.M.S., Gamage N.S.","doi":"10.31357/fesympo.v27.6569","DOIUrl":"https://doi.org/10.31357/fesympo.v27.6569","url":null,"abstract":"Bio-based film products have a considerable interest as a replacement for petroleum synthetic polymers of plastics. They are manufactured with a blend of corn starch such as Poly Lactic Acid (PLA) and Poly Butylene Adipate-co-Terephthalate (PBAT) based raw materials that have been specifically engineered to facilitate the process of biodegradation and compost ability. Hence, biodegradable polymers have been regarded as a promising solution to tackle the pollution caused by the wide use of conventional polymers. As the main responsible institute for integrating environmental considerations into the country‘s development process, the Central Environment Authority of Sri Lanka has taken an action to ban food wrappers (lunch sheets) made from conventional polymers in Sri Lanka. Thus, this study was to determine the biodegradability of bioplastic materials lunch sheets, available on the Sri Lankan market that are labeled as 100% biodegradable but not certified as compostable. The other specific objectives are to identify the biodegradability rate of each brand of lunch sheets, categorize those lunch sheets according to their biodegradability and finally get an idea to determine the optimum conditions for the biodegradation of a bio- based lunch sheet. In this study, the test was carried out in a controlled composting environment located in Gampaha–Dompe Green Park. Three different brands of biodegradable bio-based film products were tested together with cellulose paper as the positive control and nonbiodegradable lunch sheet (LDPE) as the negative control. The project length was 15 weeks. Samples were placed into frames which are made of wooden slats as width=280 mm, length=340 mm and height=50 mm and a 1x1 mm polyethylene mesh was fixed onto the frames. The methodology adopted was based on the study conducted in the Czech Republic in 2016. The emphasis was put on discovering whether bio-based film products are biodegradable or not. The biodegradability of each bio-based film product was tested using Visual inspection; the decomposed samples were inspected visually comparing with initial samples, Weight loss measurement; the initial weight and the weight after decomposition were measured using an analytical balance, FTIR and TGA analysis. Furthermore, the quality of the compost was analyzed using quality parameters such as pH, electrical conductivity, moisture, organic carbon%, nitrogen%, phosphorous%, potassium%, C/N ratio and S. The visual inspection of Sample C revealed large cracks and porous structure than Sample A and Sample B. Positive control was completely digested and the negative control stayed as it is. According to the weight loss measurement analysis, the positive control totally degraded and degradation order was Sample C>Sample A>Sample B. The TGA only suggested a partial degradation of samples. FTIR analysis indicated that the positive control was totally biodegradable, Sample B and sample C partially biodegradable and Sample A and ne","PeriodicalId":205644,"journal":{"name":"Proceedings of International Forestry and Environment Symposium","volume":"30 8","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139963253","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}