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Please use this identifier to cite or link to this item: http://hdl.handle.net/10204/2383

Title: Biological nitrate removal from synthetic wastewater using a fungal consortium in one stage bioreactors
Authors: Greben, HA
Joubert, LM
Tjatji, MP
Whites, HE
Botha, A
Keywords: Bioreactors
Nitrate removal
Issue Date: Apr-2007
Publisher: Water Research Commission
Citation: Greben, HA et al. 2007. Biological nitrate removal from synthetic wastewater using a fungal consortium in one stage bioreactors. Water SA, Vol. 33(2), pp 285-290
Abstract: A series of lignocellulosic fungi, capable of cellulase and/or xylanase production, were isolated from soil to be used for cellulose degradation and nitrate removal from nitrate-rich wastewater in simple one-stage anaerobic bioreactors containing grass cuttings as source of cellulose. The fungal consortium, consisting of six hyphomycetous isolates, some of which belong to the genera Fusarium, Mucor and Penicillium, was able to remove a significant portion of the nitrate from the treated water. The results were obtained for three bioreactors, i.e. FR, FRp and AFRp, differing in volume and mode of grass addition. Bioreactor AFRp received autoclaved grass, instead of non-autoclaved grass containing natural microbial consortia, as supplied to FR and FRp. Nitrate removal in FR amounted to 89% removal efficiency, while this was 65% and 67% in FRp and AFRp, respectively. The residual chemical oxygen demand (COD) concentration in FR was higher than 600 mg/ℓ, while it was 355 and 379 mg/ℓ in FRp and AFRp, respectively. The similar nitrate removal results for AFRp and FRp indicated that the micro-organisms attached to grass cuttings did not seem to affect the nitrate removal in the reactor. This observation has led to the conclusion that the fungal consortium was, except for being able to degrade cellulose within the grass cuttings, also responsible for nitrate removal from the synthetic nitrate-rich wastewater
Description: Copyright: 2007 Water Research Commission
URI: http://www.wrc.org.za
ISSN: 1816-7950
Appears in Collections:Pollution and waste
General science, engineering & technology

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