Abstract
Nitrified leachate may still require an additional bio-denitrification step, which occurs with the addition of often-expensive chemicals as carbon source. This study explores the applicability of low-cost carbon sources such as garden refuse compost and pine bark for the denitrification of high strength landfill leachates. The overall objective is to assess efficiency, kinetics and performance of the substrates in the removal of high nitrate concentrations. Garden refuse and pine bark are currently disposed of in general waste landfills in South Africa, separated from the main waste stream. A secondary objective is to assess the feasibility of re-using green waste as by-product of an integrated waste management system. Denitrification processes in fixed bed reactors were simulated at laboratory scale using anaerobic batch tests and leaching columns packed with immature compost and pine bark. Biologically treated leachate from a Sequencing Batch Reactor (SBR) with nitrate concentrations of 350, 700 and 1100 mgN/l were used for the trials. Preliminary results suggest that, passed the acclimatization step (40 days for both substrates), full denitrification is achieved in 10-20 days for the pine bark and 30-40 days for the compost.
References
Jun 15, 1993·Physical Review. B, Condensed Matter·S Benner, H Haug
Oct 18, 2001·Journal of Biotechnology·S E OhI S Kim
Mar 22, 2002·Water Research·M I M Soares
Nov 8, 2002·Bioresource Technology·Ghasem D Najafpour, Cheong Poi Shan
Feb 25, 2006·Waste Management & Research : the Journal of the International Solid Wastes and Public Cleansing Association, ISWA·Raquel Barrena GómezAntoni Sánchez Ferrer
Feb 28, 2006·Waste Management·Cristina Trois, Andreas Polster
Jun 13, 2006·Waste Management·C H BensonJ M Rawe
Dec 5, 2006·Journal of Hazardous Materials·Lo TsuiWilliam R Roy
Nov 13, 2007·Journal of Hazardous Materials·S RenouP Moulin
Dec 18, 2008·Waste Management·Qi ZhongLan Wang
Citations
Oct 4, 2014·Journal of Hazardous Materials·Xiao-Li YangMing-Qian Xia
Mar 19, 2013·Journal of Hazardous Materials·Zhiqiang ShenJianlong Wang
Jun 18, 2010·Journal of Hazardous Materials·Cristina TroisLaurent Oxarango
Mar 11, 2016·Applied Microbiology and Biotechnology·Zhiqiang ShenJianlong Wang
Mar 15, 2016·Environmental Science and Pollution Research International·Qianyu HangZeying Hou
Oct 27, 2015·BioMed Research International·Juan Ramírez-GodínezGabriela Vázquez-Rodríguez
Jan 17, 2013·Bioresource Technology·Zhiqiang ShenJianlong Wang
Mar 20, 2015·Environmental Science and Pollution Research International·Vaishali Ashok, Subrata Hait
Dec 11, 2014·Environmental Technology·R R FrankF Coulon
Apr 30, 2016·Biodegradation·Tianlei QiuXuming Wang
Jun 1, 2017·Environmental Science and Pollution Research International·Jinlong LiShihai Deng
Oct 7, 2019·Journal of Applied Microbiology·Ankita RajtaPriyanka Pathania
Nov 2, 2019·International Journal of Environmental Research and Public Health·Qian ZhangTiantao Zhao
Sep 4, 2015·Environmental Science and Pollution Research International·Qian ZhangXiaoyi Xu
Jun 1, 2019·Journal of Environmental Management·Rosanna Margalef-MartiNeus Otero
May 8, 2021·Bioresource Technology·Zihan ZhuTao Zhou