Determination of the mineral constituents of recycled paper mill sludge
Source abstract
Abstract
Innovative uses for recycled paper mill sludge are required to improve the industry’s sustainability. While purified fractions of sludge may prove to be of greater value for targeted applications, rapid and accurate characterization of these heterogeneous waste materials is becoming essential. We examined three methodologies for determining the mineral composition of recycled paper mill sludge. We found thermogravimetric analysis (TGA) to be a fast and precise method for determining calcium carbonate based on its thermal decomposition temperature. Total ash content of recycled paper mill sludge determined at 700°C had a strong correlation to the traditional TAPPI ash. We evaluated fractionation methodologies using TGA and found that fiber-rich and inorganic rich-portions could be produced by dry screening recycled paper mill sludge.
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Research context
OpenAlex topics: Concrete and Cement Materials Research · Chemical Synthesis and Characterization · Recycling and utilization of industrial and municipal waste in materials production
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