Suresh T. Nesaratnam is a Senior Lecturer in environmental engineering at The Open University, where he is involved in the distance-teaching of water and wastewater treatment. He graduated with an Honours degree in Chemical Engineering from Imperial College, London and then studied for a Masters and a PhD in Biochemical Engineering at the University of Birmingham. Before joining The Open University in 1991, he worked in a large Engineering Consultancy in Malaysia; in Applied Research for the oil industry, in Kuwait; in the enforcement of pollution control regulations with the Ministry of the Environment, in Oman; and in Scotland, where his work was on water and wastewater treatment for offshore oil and gas platforms. His research interests cover water and wastewater treatment, and his most recent publication is on the 2018Optimization of activated carbon production from date pits', in the International Journal of Environmental Engineering.

Shahram Taherzadeh is a Lecturer in environmental engineering at The Open University, where he is a key member of the Acoustics Research Group. Shahram graduated with a First Class Honours degree in Physics from the University of Essex. He undertook research for a PhD in Acoustics, at The Open University. He is an active researcher, specialising in the modelling of outdoor sound propagation, outdoor noise mitigation methods and interaction of sound with the ground. He is author or co-author of a number of papers in scientific journals and conference proceedings. Shahram is involved in teaching noise pollution control to undergraduate and postgraduate students and Finite Element Analysis to Postgraduates. He is an examiner for UK Institute of Acoustic's Diploma in Acoustics and Noise Control.

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