A single-stage trickling-filter plant (Figure 12.21) is proposed for treating a dilute wastewater with a BOD concentration of 170 mg/l. The plant is located in a warm climate and the minimum wastewater temperature anticipated is 16°C. Using a recirculation ratio of 0.5, what is the maximum allowable BOD loading for a stone-media filter to achieve an average effluent BOD of 30 mg/l?
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