Start‐up of a trickling photobioreactor for the treatment of domestic wastewater

Katam, Keerthi and Tiwari, Yashendra and Shimizu, Toshiyuki and Soda, Satoshi and Bhattacharyya, Debraj (2021) Start‐up of a trickling photobioreactor for the treatment of domestic wastewater. Water Environment Research, 93 (9). pp. 1690-1699. ISSN 1061-4303

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A stand-alone trickling photobioreactor (TPBR) was seeded with activated sludge and microalgae to treat domestic wastewater. The TPBR was started-up at 12-h hydraulic retention time at room temperature with 12:12 h light:dark cycle. The light was provided by blue LED strips. The reactor has a total volume of 30 L and is divided into six segments. Each segment is 30 cm long and has a diameter of 15 cm. Each segment was packed with polyurethane foam sponge cubes (2.5 × 2.5 × 2.5 cm3) with 40% occupancy. The chemical oxygen demand (COD), total organic carbon (TOC), total nitrogen (TN), and phosphorus (P) of domestic wastewater varied in the range of 164–256 mg/L, 84.4–133.8 mg/L, 34.2–55.6 mg/L, and 24.7–39.3 mg/L, respectively, during this period. The COD, TOC, TN, and P concentrations in the effluent after 45 days of operation were 30.24 ± 3.36 mg/L, 7.69 ± 0.09 mg/L, 16.67 ± 0.39 mg/L, and 17.48 ± 0.5 mg/L, respectively. The chlorophyll-to-biofilm biomass ratio increased during the experimental period. The above results indicate that the algal–bacterial symbiotic relationship is beneficial for carbon and nutrient removal from domestic wastewater. Practitioner points: Trickling photobioreactor works on natural ventilation and has low power requirements and a small footprint. The porous sponge media helped in immobilizing and subsequent harvesting of biomass. The reactor conditions favored the growth of diatoms (brown algae) over green algae. © 2021 Water Environment Federation

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IITH Creators:
IITH CreatorsORCiD
Bhattacharyya, DebrajUNSPECIFIED
Item Type: Article
Additional Information: This research was supported by the Japan International Cooperation Agency (JICA) under the Collaboration Kick‐starter Program (CKP) and the Ministry of Human Resource Development of India under the Frontier Areas of Science and Technology (FAST) program.
Uncontrolled Keywords: activated sludge; algae; nitrogen removal; photobioreactor; wastewater treatment
Subjects: Civil Engineering
Divisions: Department of Civil Engineering
Depositing User: . LibTrainee 2021
Date Deposited: 30 Sep 2022 11:45
Last Modified: 30 Sep 2022 11:45
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