Abstract
In an attempt to achieve water suitable for recycling from paper-mill effluent, photo-Fenton's advanced oxidation and chemical coagulation were investigated as options to remove both non-biodegradable COD and color from pre-bioremediated block liquor effluent. It was found that at the first bioremediation COD removal ranged from 35–98% and TSS removal ranged from 12–89%. Almost 20% of the heavy metals were removed. Photo-Fenton's UV advanced oxidation and lime coagulation combination treatment achieved complete removal of COD, TSS and color. It was able to remove 80–100% COD, 70–100% TSS and 77–100% color. The removal of heavy metals was enhanced to reach >80% removal. Two potentialmicrobial species out ofthe eight tested strains were the most dominant species in the three media. Diplodia oryzae and Phaerochaete chrysosporium NRRL6364 enhanced the post-physicochemical treatment to reach optimum clean-up after 12 days of incubation at 32°C They produced a medium-grade recycled water. Operating costs are outlined.
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