Tertiary treatment of municipal wastewater using isolated algal strains: treatment efficiency and value-added products recovery |
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| Authors: | Swati Rani Wendong Tao Asha Srinivasan |
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| Institution: | 1. Department of Civil Engineering, Indian Institute of Technology, Roorkee, India;2. Department of Environmental Resources Engineering, College of Environmental Science and Forestry, State University of New York, Syracuse, NY, USA;3. Department of Civil Engineering, University of British Columbia, Vancouver, Canada |
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| Abstract: | ABSTRACTTwo microalgal strains (Chlorella sorokiniana, A&B,) grown optimally at pH 9 (A) and 7 (B) were isolated from a municipal wastewater treatment plant. These strains were used to check their efficacy for nutrients and organic carbon removal capacities from the tertiary wastewater. The strains were characterised using 18S rDNA sequencing method and both the strains closely related to Chlorella sorokiniana. Different inoculum doses (IDs) of both the strains were tried to check their efficacy on wastewater treatment. Due to the increase in the IDs, hydraulic retention time decreased from 6 d to 1?d. On an average, 12–100% of total kjeldahl nitrogen, 53–96% NO3–N, and 59–92% PO4–P, were removed. Despite the same growth environment, strain A with the highest ID (700?mg/L) showed the best performance in terms of overall organic carbon removal, nutrient removal, and value-added products recovery. Strain A showed an increase in carbohydrate and protein content by 42% and 13%, respectively. Both the strains showed luxury phosphorus uptake and found suitable for advanced wastewater treatment. |
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| Keywords: | Chlorella sorokiniana nutrient removal inoculum doses hydraulic retention time value-added products light/dark study |
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