Sains Malaysiana 46(8)(2017): 1221–1229

http://dx.doi.org/10.17576/jsm-2017-4608-07

Effectiveness of Lake Remediation towards Water Quality: Application in Varsity Lake, University of Malaya, Kuala Lumpur

(Keberkesanan Pemulihan Tasik Terhadap Kualiti Air: Aplikasi di Tasik Varsiti, Universiti Malaya, Kuala Lumpur)

NUZAIMA CHE MOOD*, FARIDAH OTHMAN, NOOR FARAHAIN MUHAMMAD AMIN & MD IBRAHIM ADHAM

Civil Engineering Department, University of Malaya, 50603 Kuala Lumpur, Federal Territory, Malaysia

Diserahkan: 8 September 2016/Diterima: 1 Februari 2017

ABSTRACT

Surface water quality monitoring is an important tool for enhancing the water body management system. This study focuses on the water quality of a lake based on rehabilitation work completed in 2014. This lake suffers from eutrophication and water quality degradation due to the increase in pollution rates and water source scarcity. Nine points were selected to represent the water quality status for the study area. Two river tributaries that pass through the University Malaya (UM) campus have been considered due of its potential as a water source for the lake. Field and laboratory analysis were conducted to understand the transport of water quality parameters. The data variations were analyzed using a multivariate statistical method to determine the significant differences between the lake and river. Based on the Malaysian Water Quality Index (WQI) and cluster analysis, the results indicated that the lake and river have different physico-chemical characteristics and the lake water has a better quality than the river. Comparison of the concentration for BOD, TSS, PO₄^3- and NO^3- between year 2009 and current study proved that the water quality has improved by 99.8% proving that the lake remediation is effective.

Keywords: Eutrophication; lake water; physico-chemical; remediation; water quality

ABSTRAK

Pemantauan kualiti permukaan air adalah satu wadah yang penting untuk memperbaiki sistem pengurusan air. Kajian ini memberi tumpuan kepada kualiti air tasik berdasarkan kerja-kerja pemulihan yang dilakukan pada tahun 2014. Tasik ini mengalami eutrofikasi dan penurunan kualiti air kerana peningkatan kadar pencemaran dan kekurangan sumber air. Sembilan lokasi telah dipilih untuk mewakili status kualiti air di dalam kampus Universiti Malaya (UM). Dua buah anak sungai yang melalui kampus UM turut dikaji kerana potensinya sebagai salah satu sumber untuk air tasik. Analisis lapangan dan makmal telah dijalankan untuk memahami pengangkutan parameter kualiti air. Data dianalisis dengan menggunakan kaedah multivariat statistik untuk menentukan perbezaan antara tasik dan sungai. Berdasarkan Indeks Kualiti Air Malaysia (WQI) dan analisis kelompok, keputusan membuktikan bahawa tasik dan sungai mempunyai ciri fiziko-kimia yang berbeza dan air tasik mempunyai kualiti yang lebih baik daripada sungai. Perbandingan bagi BOD, TSS, PO₄^3- dan NO^3- untuk tahun 2009 dan kajian semasa membuktikan bahawa kualiti air semasa telah meningkat sebanyak 99.8%. Ini membuktikan bahawa pemulihan tasik adalah berkesan.

Kata kunci: Air tasik; eutrofikasi; fiziko-kimia; kualiti air; pemulihan

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*Pengarang untuk surat-menyurat; email: enuzaima@siswa.um.edu.my