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Single-stage MBBR as post-treatment step for upgrading large WWTPs – Experiences of one-year pilot plant operation by S. Leonhard; D. Schreff; K. Thoma; W. Gander; M. Wichern; R. Hilliges is a Environmental Science article available to read on EtoBox.

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In growing urban areas, increasing nitrogen loads to large WWTPs can be problematic for the existing nitrification/denitrification stage and necessitate the enlargement of the entire wastewater treatment system. Nitrogen removal is usually the most critical process in overload situations, often limited by the hydraulic capacities for recirculation. A simple and cost-effective way to meet low nitrogen effluent requirements is the proposed single-stage MBBR. This system can be implemented additionally as a bypass in the effluent. To investigate the practicability of the proposed concept, a pilot plant was operated to polish treated wastewater with an MBBR. The process is designed for post-treatment denitrification to eliminate the remaining nitrate‐nitrogen in the already treated wastewater. The paper extends the current knowledge of low concentration gradients, since no information is available on the post-treatment of nitrate‐nitrogen to 2.5 mg/L or below. In addition, the tested hydraulic retention time (HRT) of only 60 min is exceptional, allowing future single-stage MBBRs to be sized smaller. The first results of one year of operation showed a stable nitrate‐nitrogen reduction f

Who reads Single-stage MBBR as post-treatment step for upgrading large WWTPs – Experiences of one-year pilot plant operation?

Author

S. Leonhard; D. Schreff; K. Thoma; W. Gander; M. Wichern; R. Hilliges

Publisher

Elsevier BV

Published

2022

Language

EN

Field

Environmental Science (Physical Sciences)