Effect of Aluminium Salt Dosing on Activated Sludge Settleability Indicators: A New Settleability Model Development
by
Peter Ojo and Augustine Osamor Ifelebuegu *
Peter Ojo and Augustine Osamor Ifelebuegu *
School of Energy, Construction and Environment, Coventry University, Coventry CV1 5FB, UK
*
Author to whom correspondence should be addressed.
Water 2019, 11(1), 179; https://doi.org/10.3390/w11010179
Received: 1 November 2018 / Revised: 29 December 2018 / Accepted: 14 January 2019 / Published: 21 January 2019
(This article belongs to the Special Issue Biological Processes and Fate of Chemical Pollutants in Drinking Water and Wastewater Treatments)
There has been a significant rise in the use of aluminium salts (Al3+) for the chemical precipitation of phosphates in wastewater treatment plants due to growing stricter regulatory requirements for wastewater effluent release to the environment. The modelling of the settleability of the resultant Al3+ sludge in present engineering practice for design and optimisation are still based on conventional sludge settleability models. This paper describes a novel activated sludge settleability model which is designed to analyse the effects of Al3+ dosing on activated sludge settleability indicators, zone settling velocity (ZSV), and stirred specific volume index (SSVI). The impact of Al3+ dosing concentrations on ZSV and SSVI of full scale activated sludge plant were analysed in the laboratory over a three years’ period and the exponential form of the Vesilind equation was optimised and validated to include alum chemical dosing parameters. The proposed model equation was found to effectively describe the settleability of Al3+ dosed sludge for dosing concentrations range of 0 to 100 mg/L.
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Keywords:
activated sludge; settleability; zone settling velocity; alum; stirred sludge volume index
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MDPI and ACS Style
Ojo, P.; Ifelebuegu, A.O. Effect of Aluminium Salt Dosing on Activated Sludge Settleability Indicators: A New Settleability Model Development. Water 2019, 11, 179.
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