Lower infiltration rates during groundwater recharge significantly improve the removal of poliovirus from tertiary-treated wastewater.
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Slow infiltration may enhance poliovirus removal during wastewater recharge; leaves open optimal rates for field-scale groundwater protection.
Studies were conducted to determine the influence of infiltration rate on poliovirus removal during groundwater recharge with tertiary-treated wastewater effluents. Experiments were conducted at a uniquely designed, field-situated test recharge basin facility through which some 62,000 m3 of sewage had been previously applied. Recharge at high infiltration rates (75 to 100 cm/h) resulted in the movement of considerable numbers of seeded poliovirus to the groundwater. Moderately reduced infiltration rates (6 cm/h) affected significantly improved virus removal. Very low infiltration rates (0.5 to 1.0 cm/h), achieved by partial clogging of the test basin, yielded the greatest virus removal efficiencies.
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Vaughn et al. (1981) studied this question.
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