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Keerthi Katam,Debraj Bhattacharyya,Satoshi Soda,Toshiyuki Shimizu 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.102 No.-
In this study, the efficiency of a trickling photo-bioreactor (TPBR), seeded with activated sludge andmicroalgae, was evaluated for domestic wastewater treatment. TPBR was operated completely on naturalaeration at 2-, 4-, and 6-h hydraulic retention time (HRT) with a 12:12 h light: dark cycle. The totalorganic carbon (TOC) and total nutrient (TN) removal were negatively affected by decreasing the HRTfrom 6 to 2 h. The TPBR was able to reduce TOC from 93 to 9 mg/L, TN from 34 to 18 mg/L, and phosphorusfrom 23.5 to 4 mg/L at 6-h HRT. The chlorophyll concentration (5 – 7 mg per liter of sponge volume)was observed to be highest in the middle of the reactor. Altogether, 106 organic micropollutants of differentclasses like pharmaceutical, personal care products, pesticides, herbicides, and fungicides weredetected in the influent wastewater sample. However, in the treated effluent, only 17 micropollutantswere detected at 6-h HRT. This shows that the algal-bacterial consortia are capable of removing micropollutantsfrom wastewater. The energy input was 0.06 kWh/kg COD removed which is much less than theconventional activated sludge processes. The results indicate that this novel system is capable of providinga sustainable wastewater treatment solution.
Keerthi Katam,Debraj Bhattacharyya 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.69 No.-
This study compares the performance of two different systems (i) immobilized microalgae and suspended activated sludge (System A) and (ii) suspended co-culture (System B) in simultaneous treatment and biofuel production from domestic wastewater at different HRTs. The System A showed higher lipid content and carbon, nitrogen and phosphorous removal (40, 88, 91, and 93%) than System B (16, 87, 58, and 80%). C18:0 and C18:1n9t are dominant fatty acids observed in System A and C16:0 and C18:1n9t in System B. The immobilization of microalgae exhibited more benefits than suspended co-culture in terms of treatment and biofuel production.