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In page Tapioca:

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A typical Indonesian tapioca factory in 2011 produces wastewater with three times the allowed amount of cyanides. The bigger issues relative to regulatory limits are the total suspended solids, biochemical oxygen demand, chemical oxygen demand values. As a result, the main proposed treatment methods include anaerobic digestion (producing methane-rich biogas), as fertilizer, and possible future reuse of the starch within.[citation needed] (An aerobic treatment system has been successful run in Thailand in 2004.)[2] As of 2023, the technology to recycle the suspended starch granules in tapioca starch wastewater has become mature enough under the name of "liquid sugar". It is expected to create more money-value compared to biogas.[3]