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Open AccessArticle

Sedimentation of Raw Sewage: Investigations For a Pumping Station in Northern Germany under Energy-Efficient Pump Control

Department of Water Management, University of Rostock, Satower Straße 48, 18059 Rostock, Germany
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Water 2019, 11(1), 40; https://doi.org/10.3390/w11010040
Received: 30 November 2018 / Revised: 11 December 2018 / Accepted: 24 December 2018 / Published: 26 December 2018
(This article belongs to the Special Issue Smart Hydraulics in Wastewater Transport)
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Abstract

Flow control in wastewater pressure pipes can reduce energy consumption but increases the risk of sediment formation due to reduced flow velocity. In this work, the sedimentation behavior of dry and wet weather samples at the inflow of a wastewater pumping station is determined by settling column experiments. Based on the derived characteristic settling velocity (vs) distribution, the impact of energy-efficient flow control on sediment formation in pressure pipes (600 mm diameter) was quantified in comparison to a simple on/off operation. In parallel, the sediment formation for 2 years of pumping operation was monitored indirectly via the friction losses. For the investigated case, settling is strongly influenced by the inflow condition (dry, combined from road runoff). Under combined inflow, the proportion of solids with vs from 0.007 to 1.43 mm/s significantly increases. In energy-efficient mode with smoother operation and shorter switch-off sequences, the sediment formation is significant lower. The mean deposit’s height in energy-efficient control was calculated to 0.137 m, while in on/off operation the mean deposit’s height was 0.174 m. No disadvantages arise over a long period by installing the energy-efficient control. The decreased flow lead under the investigated conditions even to a reduced sediment formation. View Full-Text
Keywords: sewage sedimentation; sediment formation; deposit’s height; settling velocity experiment; energy-efficiency; pressure pipe sewage sedimentation; sediment formation; deposit’s height; settling velocity experiment; energy-efficiency; pressure pipe
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Rinas, M.; Tränckner, J.; Koegst, T. Sedimentation of Raw Sewage: Investigations For a Pumping Station in Northern Germany under Energy-Efficient Pump Control. Water 2019, 11, 40.

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