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biosolids sludge storage ready for fram land

Gray mud, background and texture

Water Purification Plant from Above

Golden bubbles of sludge gas on a swamp

Wast sludge mud from effluent treatment

River soil composition concept. Woman a scientist takes a sludge sample from a river close up.

Wet mud

toxic waste

74. A close-up of sludge being poured into a dewatering system

Wastewater treatment plant, aerated activated sludge tank.

Water Pollution From The Big City.

Black sludge disposal from wastewater treatment in white plastic bag