Transcription of 6 SETTLING TESTS - Experimental Methods
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6 SETTLING TESTS - Experimental Methods
6. SETTLING TESTS . Authors: Reviewers: Elena Torfs Glen T. Daigger Ingmar Nopens Imre Tak cs Mari Winkler Peter A. Vanrolleghem Sophie Balemans Ilse Y. Smets Low INTRODUCTION concentration Clarification Clarification Class I Class II. SETTLING is an important process in several of the unit operations in wastewater treatment plants (WWTPs). The most commonly known of these unit processes are primary SETTLING tanks (PSTs), which are a treatment units Dilution before the biological reactor, and secondary SETTLING tanks Zone SETTLING (SSTs), which are a clarification step prior to discharge Class III. into a receiving water. Moreover, SETTLING also plays an important role in new technologies that are being developed such as granular sludge reactors. Due to the Compression different nature of the settleable components (raw Class IV. wastewater, activated sludge , and granular sludge ) and High concentration the concentration at which these compounds occur, these Low: High: unit processes are characterised by distinctly different particulate flocculent SETTLING behaviours.
concentrations of the incoming sludge are typically in the range for hindered settling, and sludge thickening inside the sludge blanket is governed by compressive settling. In contrast to this, a specific characteristic of the granular sludge technology is the granules’ low tendency to coagulate under reduced hydrodynamic shear (de Kreuk
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