Please use this identifier to cite or link to this item: https://scholarbank.nus.edu.sg/handle/10635/221854
Title: PILOT STUDY ON IMPROVING LEACHATE WATER QUALITY USING WETLAND TREATMENT SYSTEM IN LORONG HALUS
Authors: CHRISTIAN BUDIMAN
Keywords: Environmental Management
Master (Environmental Management)
MEM
Study report
Ting Yen Peng
2011/2012 EnvM
Issue Date: 27-Jun-2012
Citation: CHRISTIAN BUDIMAN (2012-06-27). PILOT STUDY ON IMPROVING LEACHATE WATER QUALITY USING WETLAND TREATMENT SYSTEM IN LORONG HALUS. ScholarBank@NUS Repository.
Abstract: The old Halus landfill accumulated 30 years of Singapore’s waste and it has been 12 years since the landfill had been closed. Sungei Serangoon also known as Serangoon River lies nearby the old landfill. When it rains, water passes through the waste buried underneath the landfill. This water known as leachate carries pollutants and which are high in nutrients. It may seep and pollute the river. As there is a need to increase water catchment, Sungei Serangoon is dammed to be the 17th Singapore reservoir. Therefore there is a need to ensure good reservoir water quality. Lorong Halus Remediation System was constructed to improve the quality of leachate water and prevent it from flowing into the reservoir. It was officially opened to public on 5th March 2011. The Lorong Halus Remediation System treats leachate through a pre-treatment process (aeration and sedimentation process) and aquatic plant treatment before it is discharged into public sewer. The objective of this study is to test two different plant species and to find their efficiency in treating leachate. Two plants species namely Cyperus alternifolius and Phragmites karka were selected for this study. Both plants were monitored for 24 weeks. Water samples were taken monthly for laboratory analysis. The study shows positive results in a reduction of Biochemical Oxygen Demand (BOD5), Amonia Nitrogen (NH3-N), Total Nitrogen (TN), and Total Phosphorus (TP), while there is a lower reduction for Chemical Oxygen Demand (COD), Total Suspended Solids (TSS), and Total Dissolved Solids (TDS). Cyperus alternifolius has average removal efficiency of 58.2% (BOD5), 97.5% (NH3), 81.4% (TN) and 24.3% (TP). Phragmites karka has average removal efficiency of 34.8 % (BOD5), 97.4% (NH3), 71.8% (TN) and 29.2% (TP). COD removal for both Cyperus alternifolius and Phragmites karka are 16.1% and 9.3% respectively. TSS reduction is achieved by the pre-treatment process while TDS reduction is only 9.4% and 4.7% by Cyperus alternifolius and Phragmites karka. iii Plant growth was also monitored monthly. Both plants showed positive growth with Phragmities karka showing a more rapid weekly growth compared to Cyperus alternifolius. The report discusses in detail on the pilot plant set up and analyzed the trend and result of the leachate quality after treatment by the two species.
URI: https://scholarbank.nus.edu.sg/handle/10635/221854
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