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Pretty silly - the sewage treatment company could use willows if they worked in bulk. Instead they use settling and digestors. Still open-air in our town. Sludge is used as landfill and sometimes fertilizer/soil amendment. What's the difference?


1) the sewage treatment company uses lots of energy and fairly clean (often drinkable) water to transport the sewage to their large-scale plants.

2) chances are that users will feel more responsible for a local, small-scale system, and not 'kill' it by flushing down all kinds of chemicals.


Oh, we have enough infrastructure in the rich world to make flushing toilets work.




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