Simultaneous removal of BOD, N and P in a single continuous flow real scale activated sludge reactor with cyclic aeration | Zendy

Álvaro Orozco-Jaramillo | Zendy; Santiago Vélez-Velásquez | Zendy

Open Access

Simultaneous removal of BOD, N and P in a single continuous flow real scale activated sludge reactor with cyclic aeration

Author(s) -

Álvaro Orozco-Jaramillo,

Santiago Vélez-Velásquez

Publication year - 2020

Publication title -

water practice and technology

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.243

H-Index - 15

ISSN - 1751-231X

DOI - 10.2166/wpt.2020.012

Subject(s) - aeration , anoxic waters , activated sludge , nitrification , sewage treatment , continuous stirred tank reactor , denitrification , environmental engineering , phosphorus , environmental science , wastewater , aerated lagoon , organic matter , sedimentation , enhanced biological phosphorus removal , pulp and paper industry , waste management , chemistry , environmental chemistry , nitrogen , engineering , paleontology , organic chemistry , sediment , biology

The present study evaluates the performance of a real scale domestic wastewater treatment plant (WWTP), operating under continuous flow conditions with ‘extremely high sludge age’, designed to remove organic matter and perform nitrification-denitrification within a single reactor under cyclic aeration. Composite samples were withdrawn from the reactor for one week and their analysis results compared satisfactorily with the calculations of the design models. The WWTP is operating under stable conditions with a BOD5 removal of 86%, COD removal of 87%, TKN removal of 73% and, unexpectedly, a stable removal of 55% of total phosphorus. The design of the WWTP is simple and consists of a single aeration tank with a kinetic selector and a secondary sedimentation tank, operating under cyclic conditions in the aeration tank, with 45-minute aeration on (oxic environment) and 15 minutes aeration off (anoxic environment). The system can be applied to upgrade WWTP from secondary to tertiary treatment with only small modifications. A phosphorus removal mechanism is also proposed.

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