Discussion: Flow resistance of wastewater pumping mains
نویسندگان
چکیده
منابع مشابه
A Framework for Modeling and Control of Wastewater Pumping Stations
In waste water pumping stations, centrifugal pumps driven by induction motors are used to transport the effluent collected from residential and commercial buildings to the treatment plants. Due to the varying nature of collected effluent rate, means of pump flow control should be applied. Recently, there is an engineering debate on either recommending frequency converters control or on-and-off ...
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Modeling wastewater pumping plants is rarely addressed in the literature. Standard component models as found in fluid simulation tool libraries are too complex, due to their projected generality, to be used for these applications. Lack of models results in a burden on engineers who have to test their control scenarios on real implemented systems. This may lead to unexpected delays and painful c...
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Wastewater pumping consumes 10% to 20% of electricity in wastewater treatment plants. To reduce the energy consumption, a data-driven approach is applied to model and optimize the wastewater pumping process. Datamining algorithm and multilayer perceptron neural network are used to build the pumping energy model. The optimization model is solved by an improved harmony search algorithm. Optimal p...
متن کاملMulti-pumping flow system for the determination of dissolved orthophosphate and dissolved organic phosphorus in wastewater samples.
A multi-pumping flow system (MPFS) for the spectrophotometric determination of dissolved orthophosphate and dissolved organic phosphorus in wastewater samples is proposed. The determination of orthophosphate is based on the vanadomolybdate method. In-line ultraviolet photo-oxidation is employed to mineralise organic phosphorus to orthophosphate prior to detection. A solenoid valve allows the de...
متن کاملDiscussion of ‘‘Overinvestment of free cash flow’’
Richardson’s paper is a useful addition to the literature on the relationship between cash flow and investment. His approach to estimating this relationship is a new twist on earlier approaches. Like most of this literature, Richardson finds evidence that firms’ investment decisions are excessively sensitive to current cash flow, suggesting that violations of the Modigliani–Miller assumptions a...
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ژورنال
عنوان ژورنال: Proceedings of the Institution of Civil Engineers - Water Management
سال: 2007
ISSN: 1741-7589,1751-7729
DOI: 10.1680/wama.2007.160.1.51