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Septic tank
Septic tank
A vacuum truck used to empty septic tanks in Germany
A vacuum truck used to empty septic tanks in Germany
A septic tank before installation, with manhole cover on top
A septic tank before installation, with manhole cover on top
The same tank partially installed in the ground
The same tank partially installed in the ground
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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)