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Start‐up of a trickling photobioreactor for the treatment of domestic wastewater
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. 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.
Start‐up of a trickling photobioreactor for the treatment of domestic wastewater
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. 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.
Start‐up of a trickling photobioreactor for the treatment of domestic wastewater
Katam, Keerthi (author) / Tiwari, Yashendra (author) / Shimizu, Toshiyuki (author) / Soda, Satoshi (author) / Bhattacharyya, Debraj (author)
Water Environment Research ; 93 ; 1690-1699
2021-09-01
10 pages
Article (Journal)
Electronic Resource
English
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