Treatment of Rendering Wastewater by a Liquid-Solid Circulating Fluidized Bed Bioreactor (LSCFB)
Abstract:The performance of a Liquid-Solid Circulating Fluidized Bed (LSCFB) Bioreactor for treatment of wastewater with anoxic and aerobic beds and lava rock as biofilm carrier media was used to investigate the impact of the carbon to nitrogen (COD/N) ratio on the process performance, with particular focus on total nitrogen removal. The achievability of sewer discharge criteria i.e. BOD5 < 300 mg/L, TSS < 400 mg/L, TKN < 60 mg/L, and TP < 10 mg/L during the treatment of rendering wastewater, characterized by COD of 29,509 ± 438 mg L−1, BOD5 of 20,161 ± 673 mg L−1, TKN of 1,087 < 21 mg L−1 and NH4-N of 605 ± 6.2 mg L−1, was assessed. More than 90% of influent organic matter, 79-96% nitrogen was removed during treatment of rendering wastewater. A respirometry test for COD fractionation showed a high readily biodegradable fraction (SS) of 42%, a rapidly hydrolysable fraction (SH) of 55%, a slowly hydrolysable fraction (XS) of 5.9% and inert fraction of 2.7%. The LSCFB met all the aforementioned pre-treatment criteria in Phase III at an OLR of 7.3 kg COD m−1 d−1.
Document Type: Research Article
Publication date: January 1, 2009
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