充てん塔式ろ床法による洗米廃水の処理 : 充てん塔式ろ床法による有機性廃水の処理(第7報)

概要

論文の詳細を見る
Wastewater in which rice had been washed was treated in batches in a laboratory-scale filter (100 mm in diam. and 1,000 mm in height) packed with polypropylene spheres (25 mm in diam.) over approximately two months.Biological film appeared after a few day's operation. The COD removal efficiency and residence time of wastewater increased with the development of the biological film. The residence time closely corelated to the appearance of the biological film. The COD removal efficiency remained approximately 95% over 2 months. On Run 60,a large amount of biological film was sloughed out. But channeling, ponding, and plugging were not observed in the biofilter during the period of sloughing. The absence of remarkable plugging was supported by the lack of increase in the pressure drop across the biofilter during this period. The COD removal efficiency of the biofilter decreased as the result of sloughing on Run 60,but recovered at once after a back-washing procedure on the same run.
1982-09-25