The problem Recently, a local water activist brought to public attention a disturbing phenomenon occurring in the Yamuna River in Delhi, India: vast quantities of white foam were polluting the sacred waterway. The source of this foam was traced not to a single plant, but to multiple municipal wastewater treatment plant along the river. While these plants were treating the water, the discharge process itself was contributing to the problem. Treated water, flowing through channels at high rates, intersected with the city drains at points where there were steep falls.…
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