Proses yang meggali air bawah tanah daripada perigi yang bersebelahan sungai untuk menyebabkan infiltrasi dari sungai telah banyak digunakan. Proses tersebut dinamakan penurasan tebing sungai. Kajian ini dijalankan untuk menentukan kesesuaian proses penurasan tebing sungai di tebing Sg. Kerian. Sampel-sampel tanah daripada tebing sungai itu didapatkan selepas model fizikal untuk penurasan tebing sungai dihasilkan. Analisis saringan dan ujian ketelapan dijalankan untuk menentukan sifat-sifat tanah. Tempat yang mendapatkan tanah itu dapat dipertimbangkan untuk menjadi lokasi yang sesuai untuk pemasangan penurasan tebing sungai. Kualiti air baku daripada Sg. Kerian ditentukan dan proses penurasan tebing sungai dijalankan dengan menggunakan model fizikal. Kekeruhan, warna dan BOD merupakan parameterparameter yang digunakan untuk menentukan prestasi model itu. Prestasi model itu ditentukan dengan kapasiti penyingkiran parameter-parameter itu di bawah pengaruh kadar aliran dan tempoh model itu berfungsi. Model itu difungsikan selama 150 minit dengan kadar aliran 50 ml/min, 100 ml/min, 150 ml/min, 200 ml/min dan 250 ml/min. 5 sampel diambil untuk setiap kadar aliran itu dan masing-masing diambil setiap 30 minit. Kesan tempoh berfungsi terhadap kapasiti penyingkiran untuk kekeruhan dan warna tidak jelas kerana ia stabil sepanjang tempoh berfungsi. Satu garisan yang hampir melintang sepenuhnya didapati dalam graf yang menunjukkan hubungan kapasiti penyingkiran dengan tempoh berfungsi. Kesan kadar aliran terhadap kapasiti penyingkiran tidak ditunjukkan dengan jelas kerana tiada kecenderungan dalam graf kapasiti penyingkiran lawan kadar aliran. Bagaimanapun, kapasiti penyingkiran BOD adalah tidak pasti disebabkan variasi yang tinggi dalam hasil yang dikumpulkan.
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The process of extracting groundwater from wells adjacent to a river in order to induce infiltration from the river has been applied in many countries of the world. Such process is called river bank filtration. This study was carried out in order to access the suitability of process of river bank filtration to be applied at the river bank of Sg. Kerian. Soil samples from the river bank were obtained as the step immediately after the physical model of river bank filtration was fabricated. Sieve analysis and permeability test were carried out in order to identify the properties of soil samples obtained. The chosen site to obtain soil samples could be considered as a site that suitable for installation of river bank filtration. The raw water quality from Sg. Kerian was determined and process of river bank filtration was run by using the fabricated model. Turbidity, colour and BOD were parameters used to access the performance of the model. The performance of the model was accessed by determining removal capacity of the mentioned parameters under influences of flow rate and running time of model respectively. The model was run for 150 minutes with 5 different flow rates which were 50 ml/min, 100 ml/min, 150 ml/min, 200 ml/min and 250 ml/min. For each flow rate, 5 samples were taken and each sample was taken every 30 minutes. The effect of running time of model towards removal capacity of turbidity and colour was not obvious because the removal capacity of both parameters was consistent throughout the running time. An almost horizontal line was drawn for graph that showed relationship of removal capacity with running time for each flow rate used. The effect of flow rate towards removal capacity of turbidity and colour was not clearly shown because there was no trend in graph of removal capacity versus flow rate. However, the removal capacity of BOD was doubtful due to high variation of results obtained.
Removal of turbidity, colour & bod using physical model of river bank filtration_Lye Wei Kee_A9_2011_NI