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Desiccation cracks in dried sludge, the hard final remains from a sewage plant
Desiccation cracks in dried sludge, the hard final remains from a sewage plant
Sewage sludge in a beaker from a treatment plant
Sewage sludge in a beaker from a treatment plant
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Activated sludge sewage treatment plant in Massachusetts, US
Activated sludge sewage treatment plant in Massachusetts, US
Rural Kansas lagoon on private property
Rural Kansas lagoon on private property
Aeration tank of activated sludge sewage treatment plant (fine-bubble diffusers) near Adelaide, Australia
Aeration tank of activated sludge sewage treatment plant (fine-bubble diffusers) near Adelaide, Australia
A poorly maintained anaerobic treatment pond in Kariba, Zimbabwe (sludge needs to be removed)
A poorly maintained anaerobic treatment pond in Kariba, Zimbabwe (sludge needs to be removed)