Abstract
The fly ash waste from local pulp and paper industry was mixed with municipal sewage sludge (bio solids) as a co-composting material to investigate the feasibility of applying carbon-enriched fly ash in improving the quality of bio solids generated from water treatment facility. Parallel experiments were conducted under the same composting conditions, only in one of which the fly ash was added. The other without adding fly ash was used as a control. The composting parameters, including pH, moisture content and carbon to nitrogen ratio, electrical conductivity and germination index, of the parallel experiments were monitored for 30 days. Meanwhile, the microbial activity, an important indicator of compost maturity, was examined through plate counting. Free PAHs in the compost system was also measured to investigate the degree of biodegradation in the composting system. The results of parallel experiments were compared to evaluate the feasibility of using ash as a stabilizer.
Highlights
Corner Brook Pulp and Paper (CBPP) Ltd. play an important role in promoting the economic growth of the western Newfoundland in Canada
Commercial activated carbon (AC) normally has specific surface area of 800-1200 m2/g, while coal and oil fly ash have that of 2m2/g
The high surface area of fly ash (FA) enables it to act as an adsorbent, absorbent, and moisture controller
Summary
Corner Brook Pulp and Paper (CBPP) Ltd. play an important role in promoting the economic growth of the western Newfoundland in Canada. The plant utilizes a thermomechanical pulping process to produce standard newsprint and other specialty newsprint grades for almost 700 metric tons per days. Approximately 10,000 metric tons of fly ash (FA) are generated from mill operation and disposed to landfills [1]. The leach ate of landfill has become a rising concern since it contains non-biodegradable organic matters and heavy metals which can cause surface and ground water pollution [24]. The landfill space starts getting deficient and the cost of waste disposal is increasing. There is an urgent need for CBPP Ltd. to seek sustainable waste management strategies to treat their fly ash waste
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