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Water Purification Plant from Above Wast sludge mud from effluent treatment Black sludge disposal from wastewater treatment in white plastic bag biosolids sludge storage ready for fram land Wastewater treatment plant, aerated activated sludge tank. River soil composition concept. Woman a scientist takes a sludge sample from a river close up. A dirty industrial belt filter press in operation, with sludge being dewatered on a moving conveyor belt, representing wastewater treatment and environmental technology. Water Pollution From The Big City. Wet mud Industrial pipe discharging liquid waste Sewage from drainpipe factory flowing to water treatment tank of waste-water plant. Activated sludge process system. Golden bubbles of sludge gas on a swamp