Primary settling tanks in state of the art wastewater treatment and water recourses recovery

Patziger, Miklós and Günthert, Frank Wolfgang and Jardin, Norbert and Kainz, Harald and Londong, Jörg (2015) Primary settling tanks in state of the art wastewater treatment and water recourses recovery. WATER SCIENCE AND TECHNOLOGY. ISSN 0273-1223 (Submitted)

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Abstract

The paper provides an overview on the latest results in the field of primary settling in terms of scientific research and design. In state of the art wastewater treatment primary settling tanks (PSTs) are considered as integral part of biological wastewater treatment, sludge treatment and biogas production, consequently essential part of the energetics of large wastewater treatment plants. Strongly focusing on process oriented analysis, design and operation of PSTs, over the previous few years (2013, 2014 and 2015) at a huge number of PSTs “in situ” full scale measurements were carried out. Removal efficiency, settling properties of primary sludge, internal flow structures within PSTs and their impact on performance were investigated. The paper presents the basic design goals and operation principles of PSTs, the results of full scale measurements, which also served as input data for the new edition of the German design guidline A 131 (DWA 2015). Also computational fluid dynamics (CFD) investigations calibrated and validated based on full scale measurements are shown, which highlight some interesting details how geometry design affects PST performance.

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