Abstract
Rainfall was found to affect the performance of an overland flow land treatment system used for the treatment of municipal wastewater. However, effluent BOD5 concentrations during rainfall events were only slightly higher than values observed during normal operation without rainfall and were well below the 30mg/L level. Effluent suspended solids concentrations during rainfall events were generally greater than 30mg/L, but solids were mostly inorganic and the observed concentrations were generally less than in rainfall runoff from control slopes that did not receive wastewater. Mass discharges of BOD5 and suspended solids increased significantly above normal operating values, and the increase was directly correlated with rainfall intensity and duration.
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