Paper mill sludge is a kind of solid waste produced in the process of wastewater treatment by paper-making enterprises, simple landfill, incineration or discharges directly without any treatment will not only easily make secondary pollution to the environment, but also make a resource waste. There is large amounts of fiber material in paper mill sludge, which can be used as the biomass raw material to ferment and produce fuel ethanol, possessing preferable value of resource utilization.
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