Mechanically enhanced bio-drying process requires no external heat source as it uses the energy produced by microbes in the sludge reducing costs of operation by 30% compared to thermal drying processes.
City of Shenyang in China will be the first to employ this method at a large wastewater plant to dry 1,000 metric tons of wet sludge per day.
The solution increases the solids content of the sewage sludge from 20 to 65% within 22 days, the resultant product can be then used as either fertilizer or fuel.
A pilot at a composting plant in New Hampshire, US demonstrated that the system works even at ambient temperatures that are as low as -10C.
