tailieunhanh - Báo cáo " Effects of using wastewater as nutrient sources on soil chemical properties in peri‐urban agricultural systems "

Reusing domestic wastewater for irrigation and applying biosolids as a fertiliser in crop production are common practices in peri‐urban areas of Vietnam. This study investigates the effects | VNU Journal of Science Earth Sciences 24 2008 87-95 Effects of using wastewater as nutrient sources on soil chemical properties in peri-urban agricultural systems Nguyen Manh Khai1 Pham Thanh Tuan2 Nguyen Cong Vinh3 Ingrid Oborn4 1 College of Science VNU 2 Department of Environmental Impact Assessment and Appraisal Ministry of Natural Resources and Environment MONRE 3 Soils and Fertilizers Institute 4 Department of Soil Sciences and Environment Swedish University of Agricultural Sciences SLU Received 27 May 2008 received in revised form 5 July 2008 Abstract. Reusing domestic wastewater for irrigation and applying biosolids as a fertiliser in crop production are common practices in peri-urban areas of Vietnam. This study investigates the effects of using domestic wastewater in field experiments on Fluvisols soils in peri-urban areas of Hanoi and Nam Dinh cities. We compared long-term 30-50 years wastewater-irrigated rice-dominated farming systems. Using wastewater for irrigation significantly affected pH electrical conductivity EC exchangeable K and Na and reverse aqua regia-digestible Rev Aq Reg copper Cu lead Pb and zinc Zn in the investigated areas compared with control plots irrigated using river water. There were no significant effects of wastewater irrigation on the NH4NO3-extractable fraction of cadmium Cd and other trace metals but the EDTA-extractable fraction of Cu Pb and Zn was significantly increased. Keywords SE Asia heavy metals irrigation paddy soils trace elements 1. Introduction Urbanisation and industrialisation are leading to production of a huge volume of effluents in many countries. Industrial agricultural and domestic effluents such as biosolids and wastewater are either dumped on land or used for irrigation and fertilisation purposes which creates both opportunities and problems 24 . Corresponding author. Tel. 84-4-5583306. E-mail khainm@ The advantages of reusing wastewater are that it provides a convenient disposal of waste products .