Publications

Vigneswaran, S & Thiyagaram, M 1984, 'Application of filtration theories to ground water recharge problems', Water, Air, and Soil Pollution, vol. 22, no. 4, pp. 417-428.
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A mathematical model is formulated for filtration of different flow conditions (radial flow, spherical flow and combined radial and vertical downwards flow) from O'Melia's model for deep bed filtration. The simple ground water recharge problems with the above mentioned flow conditions are also presented. The radial flow mathematical model was verified using bench-scale radial flow experiments. The removal efficiency and headless in spherical flow and combined radial - vertical downwards flow models with equal bed volume were simulated. © 1984 D. Reidel Publishing Company.

Vigneswaran, S, Visvanathan, C & Ben Aim, R 1984, 'Optimization of sand recycle rate in mobile bed filtration', Effluent & Water Treatment Journal, vol. 24, no. 12, pp. 457-460.
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Rapid sand filters have been used as a final clarifying step in municipal water treatment plants since the early 1900's. The mobile-bed deep filter process uses compressed air to lift and separate retained particles in the sand. Although reports indicate that this type of filter operates continuously without any problem, sand recycling was found to be an energy consuming process. It is therefore essential to optimize the sand recycle rate. In this study the optimum recycle rate for a particular filtration rate was estimated from the 'filter clogging front theory' using fixed bed experimental results.