Study of water neutralization in an open channel using mixtures of limestone, organic matters and laterite soils

Tajul Baharuddin, Mohamad Faizal and Mohd Yusop, Nurida and Mansor, Nur Haliza (2007) Study of water neutralization in an open channel using mixtures of limestone, organic matters and laterite soils. In: Persidangan Kebangsaan AWAM '07, 29-31 Mei 2007, Langkawi, Kedah.

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Abstract

Batu Pahat District with a population of almost 650,000 has encountered water supply woes since year 1999. The water in Sg. Bekok and Sg. Semberong experienced very low level of acidity down to pH 2.5 to 3.0 especially during rainy season. Water treatment plants have to be shut down during the low pH thus causing water shortage in Batu Pahat. The water acidification occurs when the open channels were constructed in Bekok and Semberong basin to improve the watering system to enable farming activity in the swampy area. Oxidation occurs when pyrite (FeS2) minerals in the rock were exposed to the air and water to form sulfuric acid (H2SO4) which leach out into the river and cause the lowering of the river pH. The purpose of this study was to neutralize the acidic water using limestone, organic matter and laterite soils in an open channel experiment which were conducted using a physical model. Two steps of managing the acidic water were carried out; laterite channel and anaerobic open channel limestone incorporated with organic matter. The experiments were conducted in four stages, namely experiment A, experiment B, experiment C and experiment D where each experiment consist of different composition of limestone, organic matter and laterite soils. Each material had its own function in neutralizing the acidic water. Limestone was the main material that acts as buffer to neutralize the acidic water. Laterite was use to prevent the iron in the pyrite from combining with the limestone that will decrease the efficiency of the limestone to neutralize the acidic water. The organic matter contains bacteria that will consume the oxygen in the water to provide the anaerobic condition. The results indicated that experiment D with the combinations of 80% limestone, 18% laterite soil and 2% organic matter was the optimum materials ratio to increase the pH of the water to pH of around 8 in the shortest time. The results of the study can be used to design the remediation process to increase the pH of the acidic water to neutral in the shortest possible time therefore meeting the pH requirement of the raw water quality at the intake.

Item Type:Conference or Workshop Item (Paper)
Uncontrolled Keywords:Acidic water; neutralization; physical model; limestone; organic matter
Subjects:T Technology > TD Environmental technology. Sanitary engineering > TD201-500 Water supply for domestic and industrial purposes
Divisions:Faculty of Civil and Environmental Engineering > Department of Water and Environment Engineering
ID Code:1955
Deposited By:Nurul Elmy Mohd. Yusof
Deposited On:04 Oct 2011 15:59
Last Modified:04 Oct 2011 15:59

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