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Wast sludge mud from effluent treatment biosolids sludge storage ready for fram land Black sludge disposal from wastewater treatment in white plastic bag Wastewater treatment plant, aerated activated sludge tank. River soil composition concept. Woman a scientist takes a sludge sample from a river close up. Wet mud Water Purification Plant from Above 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. Industrial pipe discharging liquid waste Golden bubbles of sludge gas on a swamp Dirty wastewater pouring into a treatment basin at a public water purification plant. Urban water system infrastructure for sewage treatment.