TAILIEUCHUNG - Báo cáo " Study on reuse of heavy metal rich sludge in ceramic pigment and construction material production "

VNU Journal of Science, Natural Sciences and Technology 24 (2008) 280-286 In this study, primarily treating waste sludge rich of Cr, Ni, Fe, generated from electroplating wastewater treatment plant and experimentally methods of utilizing wastes as inorganic pigment in production of bricks were carried out. Economic, technical and environmental efficiency and feasibility, bases to apply to practical conditions were evaluated. The results show that water accounts for about 70% of sludge. Contents of Ni, Cr and Fe are relatively high (20, and , respectively). . | VNU Journal of Science Natural Sciences and Technology 24 2008 280-286 Study on reuse of heavy metal rich sludge in ceramic pigment and construction material production Nguyen Thi Ila1 . Tran Yem1 Vu Thi Mai2 1 Faculty of Environmental Science College of Science VNU 334 Nguyen Trai Hanoi Vietnam Department of Environment Natural resource and Environment College Received 29 October 2008 Abstract. In this study primarily treating waste sludge rich of Cr Ni Fe .generated from electroplating wastewater treatment plant and experimentally methods of utilizing wastes as inorganic pigment in production of bricks were carried out. Economic technical and environmental efficiency and feasibility bases to apply to practical conditions were evaluated. The results show that water accounts for about 70 of sludge. Contents of Ni Cr and Fe are relatively high 20 and respectively . The wastes could be used to replace inorganic pigment in brick production after being primarily treated with a simple procedure. The optimal rate of replacing inorganic pigment is about 5 and 20 in case of raw material replacement. The testing results of technical parameters about compressibility flexibility all tested products meeting with standard of brick brands commonly used in construction. Environmental safety testing based on heavy metals concentration in rain water soaking tested products pH value of during 2 to 21 days shows the satisfactory in comparison to the permitted standards TCVN 5945-2005 Fe 5 Ni and Cr6 l . Cost-benefit calculations of utilizing the wastes reveal that using the wastes to replace inorganic pigment in pavement-tiled brick production gained relatively high economic efficiency and ensure the environmental safety. Keywords Ceramic pigment Electroplating Heavy metal Sludge Waste reuse. 1. Introduction Together with rapid development of industrialization and modernization processes industrial waste has dramatically increased both in amount .

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