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Commissioning of a novel in-line rheometery system in a wastewater treatment plant for more efficient polymer dosing
RISE - Research Institutes of Sweden, Bioscience and Materials, Agrifood and Bioscience.
Cape Peninsula University of Technology, South Africa.
Cape Peninsula University of Technology, South Africa.
Cape Peninsula University of Technology, South Africa.
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2019 (English)In: Flow Measurement and Instrumentation, ISSN 0955-5986, E-ISSN 1873-6998, Vol. 65, p. 309-317Article in journal (Refereed) Published
Abstract [en]

Urbanisation is putting enormous pressure on wastewater treatment plant facilities. Optimising the liquid and sludge process streams in existing plants is one way of prolonging the life span of such installations. Many Wastewater treatment plants (WWTP) have sludge dewatering installations where treated wastewater sludge is dewatered using belt filter presses amongst others, before final disposal. One of the most expensive inputs in these plants is the polymers used as flocculants. Controlling the optimum dosing in the dewatering process cannot currently be done in real-time. It has been shown that huge savings can be made by optimising the dosing rates of polymers based on the sludge rheology. An Ultrasound Velocity Profiling (UVP) and pressure drop (PD) measurement system was specially designed and commissioned for a WWTP. The system was installed in a WWTP to measure the rheological properties of sludge in-line and in real-time prior to mechanical dewatering using a belt filter press. This non-invasive in-line system was able to accurately measure the rheological parameters in real-time in a 100 mm stainless pipe. It was shown for the first time what the maximum in-line yield stress is that is required for optimum dewatering based on a relationship determined between the yield stress and the total suspended solids in the filtrate exiting the belt filter press.

Place, publisher, year, edition, pages
2019. Vol. 65, p. 309-317
Keywords [en]
Rheology, UVP+PD methodology, Wastewater sludge dewatering, Dewatering, Elasticity, Filtration, Polymers, Presses (machine tools), Reclamation, Sewage pumping plants, Sludge disposal, Wastewater disposal, Water treatment plants, Yield stress, Mechanical dewatering, Rheological parameter, Rheological property, Total suspended solids, Ultra-sound velocities, Wastewater sludge, Wastewater treatment plants, Wastewater treatment
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-37698DOI: 10.1016/j.flowmeasinst.2018.11.006Scopus ID: 2-s2.0-85060251387OAI: oai:DiVA.org:ri-37698DiVA, id: diva2:1284852
Note

Funding details: Cape Peninsula University of Technology, CPUT; Funding details: City, University of London, City;

Available from: 2019-02-01 Created: 2019-02-01 Last updated: 2019-02-01Bibliographically approved

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