A pilot-scale upflow anaerobic sludge blanket-moving bed biofilm (UASB-MBB) reactor followed by a high-rate algal pond (HRAP) was designed and operated to remove organic matter, nutrients and pathogens from sewage and to facilitate reuse. For an influent chemical oxygen demand (COD) concentration of 233 ± 20 mg/L, final effluent COD was 50 ± 6 mg/L. Successful biomass granulation was observed in the sludge bed of the upflow anaerobic sludge blanket (UASB) reactor after 5 months of operation. Ammonia removal in HRAP was 85.1 ± 2.4% with average influent and effluent ammonia nitrogen concentrations of 20 ± 3 mg/L and 3 ± 1 mg/L, respectively. Phosphate removal after treatment in the HRAP was 91 ± 1%. There was a 2–3 log scale pathogen removal after treatment in HRAP with most probable number (MPN) of the final effluent being 600–800 per 100 mL, which is within acceptable standards for surface irrigation. The blackwater after treatment in UASB-MBBR-HRAP is being reused for gardening and landscaping. This proper hydro-dynamically designed UASB reactor demonstrated successful granulation and moving bed media improved sludge retention in UASB reactor. This combination of UASB-MBB reactor followed by HRAP demonstrated successful sewage treatment for a year covering all seasons.
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Research Article|
May 29 2017
Biomass granulation in an upflow anaerobic sludge blanket reactor treating 500 m3/day low-strength sewage and post treatment in high-rate algal pond
Pritha Chatterjee;
Pritha Chatterjee
Department of Civil Engineering, Indian Institute of Technology, Kharagpur 721302, India
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M. M. Ghangrekar
Department of Civil Engineering, Indian Institute of Technology, Kharagpur 721302, India
E-mail: [email protected]
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Water Sci Technol (2017) 76 (5): 1234–1242.
Article history
Received:
January 23 2017
Accepted:
April 24 2017
Citation
Pritha Chatterjee, M. M. Ghangrekar; Biomass granulation in an upflow anaerobic sludge blanket reactor treating 500 m3/day low-strength sewage and post treatment in high-rate algal pond. Water Sci Technol 6 September 2017; 76 (5): 1234–1242. doi: https://doi.org/10.2166/wst.2017.269
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