Municipal Wastewater Selection for Microbial Biodiesel Production (2009)
Type of ContentConference Contributions - Published
PublisherUniversity of Canterbury. Chemical and Process Engineering
University of Canterbury. Civil and Natural Resources Engineering
This research compared the effects of municipal wastewaters (i.e., primary and secondary treated) from the Christchurch Wastewater Treatment Plant (CWTP) in Christchurch, New Zealand (NZ) on microbial (microalgal-bacterial) biomass production, settleability, and quality as biodiesel feedstock. Inoculums consisted of native, mixed cultures from an oxidation pond and an activated sludge process. Growth of settleable biomass was encouraged by recycling settleable solids within laboratory-scale sequencing batch reactors (SBRs) operated using a 24-hr cycle, 8-day hydraulic residence time (HRT), and controlled climate conditions. Generally, biomass concentrations of reactors fed with primary wastewater (i.e., 200/400 mg/L final mean for Cold/Warm conditions) were at least double those of secondary wastewater reactors (i.e., 70/210 mg/L final mean for Cold/Warm conditions) due to greater nutrient loading and microbial growth. Furthermore, primary wastewater reactors demonstrated much greater settling (i.e., 76 vs. 22% on average) indicating more efficient biomass harvesting. Lipid contents and types were comparable for all microbial cultures. The benefits of high carbon and bacterial concentrations in primary wastewater appeared to outweigh any disadvantage of reduced light penetration to microalgae from shading.
CitationValigore, J., O'Sullivan, A.D., Gostomski, P. (2009) Municipal Wastewater Selection for Microbial Biodiesel Production. Aachen, Germany: 8th International Conference on Sustainable Energy Technologies (SET2009), 31 Aug-3 Sep 2009. Proceedings of the 8th International Conference on Sustainable Energy Technologies, 6pp.
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Keywordsmicroalgal-bacterial biomass; activated sludge; wastewater treatment; biodiesel
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Microbial (Microalgal-Bacterial) Biomass Grown on Municipal Wastewater for Sustainable Biofuel Production Valigore, Julia Marie (University of Canterbury. Civil and Natural Resources Engineering, 2011)High biomass productivity and efficient harvesting are currently recognised challenges in microbial biofuel applications that were addressed by this research using ecological engineering principles and an integrated systems ...
Turner, S.J.; Biswas, K.; Valigore, J.M.; O'Sullivan, A.D. (University of Canterbury. Civil and Natural Resources Engineering, 2008)The use of microalgae as an economically viable feedstock for biofuel production requires development of efficient methods for growth and harvest of biomass. Here we describe a preliminary investigation of the growth and ...
Valigore, J.; O'Sullivan, A.D.; Turner, S. (University of Canterbury. Civil and Natural Resources Engineering, 2008)This preliminary research examined microbial biomass growth in sequence batch reactors fed primary treated wastewater from Christchurch Wastewater Treatment Plant (CWTP), New Zealand. Reactors were inoculated with ...