Performance of an integrated reactor with airlift loop and sedimentation for municipal wastewater treatment: A 150 m3/d pilot case study

A newly developed bio‐reactor design for municipal sewage treatment was evaluated on a pilot scale (150 m3/d). The reactor system included both anaerobic/anoxic and aerobic treatment stages with external/internal airlift circulation loops integrated with a central sedimentation chamber. The design w...

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Bibliographic Details
Published in:Canadian journal of chemical engineering 2020-02, Vol.98 (2), p.475-483
Main Authors: Liu, Shujie, Zhang, Lianfeng, Kong, Shuwei, Liu, Xu, Chen, Fuming, Zhang, Qidian
Format: Article
Language:English
Subjects:
aeration efficiency
Aerobic treatment
airlift loop
Airlifts
Ammonia
Anaerobic treatment
Configurations
Energy consumption
Footprints
Hydraulic retention time
Hydraulics
integration
municipal wastewater
Nutrients
Organic compounds
pneumatic stirring
Reactor design
Sedimentation & deposition
Sedimentation tanks
Wastewater treatment
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Summary:A newly developed bio‐reactor design for municipal sewage treatment was evaluated on a pilot scale (150 m3/d). The reactor system included both anaerobic/anoxic and aerobic treatment stages with external/internal airlift circulation loops integrated with a central sedimentation chamber. The design was conceived to enhance the removal of organic compounds and nutrients (phosphorus and nitrogen) within a smaller footprint than existing treatment processes. The downcomer of the internal circulation loop is integrated with the sedimentation tank facilitating high efficiency solid‐liquid separation in a compact configuration. The external/internal airlift circulation stages increase the potential for bio‐reactivity, while reducing energy consumption for process flows. Overall, the integrated configuration reduces the footprint required compared to conventional systems with equivalent hydraulic loads, ie, hydraulic retention time of ~12.8 hours with a hydraulic loading area of 10.3 m3/d/m2. The trial run data indicated removal efficiencies for COD, phosphorous, ammonia, and total nitrogen of 94.5%, 94.5%, 96.8%, and 78.6% respectively. Moreover, the treatment system also demonstrated a robust capacity to handle a wide range of COD influent concentrations (ie, ~ 120‐860 mg/L).
ISSN:0008-4034
1939-019X
DOI:10.1002/cjce.23624