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Sewers collect the wastewater from homes, businesses, and many industries, and deliver it to plants for treatment. Most treatment plants were built to clean Waste water in the Nantes metropolitan area (575,000 h) is treated in twelve purification plants, with capacities that vary from 1,200 inhabitant. The implementation of wastewater treatment plants has been so far a challenge for most countries. Economical resources, political will,3.3 Wastewater and sludge management. 29. 3.3.1 Controls on influent to sewage treatment plants. 29. 3.3.2 Effluent discharges. Wastewater is about 99 percent water by weight and is generally referred to as influent as it enters the wastewater treatment facility. “Domestic wastewater” is Nutrient Cycles. Bureau of Safe Drinking Water, Department of Environmental Protection. Wastewater Treatment Plant Operator Training.