the effectiveness of silica sand in semi-aerobic stabilized landfill leachate treatment硅砂的有效性在垃圾填埋场渗滤液semi-aerobic稳定治疗.pdf

Water 2010, 2, 904-915; doi:10.3390/w2040904 OPEN ACCESS water ISSN 2073-4441 /journal/water Article The Effectiveness of Silica Sand in Semi-Aerobic Stabilized Landfill Leachate Treatment Ezlina Othman 1, Mohd Suffian Yusoff 1,*, Hamidi Abdul Aziz 1, Mohd Nordin Adlan 1, 1 2 Mohammed J. K. Bashir and Yung-Tse Hung 1 School of Civil Engineering, Engineering Campus, Universiti Sains Malaysia, 14300 Nibong Tebal, Penang, Malaysia; E-Mails: ezlinaothman@ (E.O.); cehamidi@eng.usm.my (H.A.A.); cenordin@eng.usm.my (M.N.A.); gaborbash@ (M.J.K.B.) 2 Department of Civil and Environmental Engineering, Cleveland State University, 2121 Euclid Avenue, Cleveland, OH 44115, USA; E-Mail: yungtsehung@ (Y.T.H.) * Author to whom correspondence should be addressed; E-Mail: suffian@eng.usm.my; Tel: +604-5995999; Fax: +604-5941009. Received: 10 October 2010; in revised form: 1 November 2010 / Accepted: 25 November 2010 / Published: 6 December 2010 Abstract: This study examines the suitability of natural silica sand as a low-cost adsorbent for the removal of ammoniacal nitrogen and heavy metals, particularly iron and zinc, from semi-aerobic stabilized landfill leachate. Leachate samples were collected from the Pulau Burung landfill site (PBLS) in Penang, Malaysia. The above-mentioned contaminants are highlighted in this study because of their unsafe concentrations at PBLS. The effects of shaking time, settling time, and silica sand dosage on