Who knew that human waste (a/k/a fecal sludge) was so valuable? From Bloomberg News:
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Heinz-Peter Mang is obsessed with turning human waste into gold. As millions of Chinese move to cities, the German engineer is convinced the country is on the way to hitting the jackpot.
A growing portion of China’s toilet waste is converted into fertilizer and biogas. In Beijing, 6,800 tons of human excrement are treated each day by some estimates: enough to fill almost three Olympic-size swimming pools.
Over the past decade, China’s economic ascent has driven millions of rural workers into its cities in the largest migration in human history. In 2013, the number of urban dwellers crossed 731 million, overtaking the rural population by more than 100 million. Some fallouts: water shortages in the North and toilet waste routed into rivers in the south.
That’s forcing city planners to get creative in dealing with toilet refuse, and drawing engineers like Mang to help refine models.