Treatments of Kraft Bleaching Wastewater by Immobilized White Rot Fungi

• Main Authors: Ching-Huan Chen, 陳清環
• Other Authors: Hweig Wang
• Format: Others
• Language: zh-TW
• Published: 2003
• Online Access: http://ndltd.ncl.edu.tw/handle/44785417963592184544

碩士 === 國立臺灣大學 === 森林學研究所 === 91 === Wastewater treatment by immobilization of microorganisms received more attention than suspended system. Among variety of immobilization techniques, entrapment shows great promise for its simplicity and stability. Due to simpler immobilization procedure, high solubility, excellent diffusivity, good growth and good long-term biodegradability, natural polymers, such as alginate and carrageenan, are superior to synthetic polymers for microbial entrapment bedding purpose. Capability to degrade recalcitrant lignin-related pollutant by white rot fungi is well studied, however, inferior mycelial growth pattern under stirred suspended system significantly reduce their applicability for industrial scale wastewater treatment. Hence, calcium alginate and ployureathane foam were used as bedding materials to entrap two white rot fungus: Phanerochaete chrysosporium ATCC 36319 and Trametes versicolor ATCC 37501, and bleaching effluent, from mixture of chlorination and alkali extraction, was treated in this study. For treating effluents, optimal conditions using Phanerochaete chrysosporium were pH 4.0-5.5, 37℃, glucose or starch, 5g/L carbon concentration, with 0.1g/L nitrogen. Optimal conditions using Trametes versicolor were pH 4.5-6.5, 30℃, glucose or starch, 10 g/L carbon concentration, where nitrogen content was unrelated. Immobilized system were able to decolourize for longer period, although they exhibit lower optimal rate than suspended ones. In conclusion, the feasibility to treat bleaching effluent by white rot fungus entrapment is demonstrated.