The Biological Treatment of Coke-Oven Effluents: An Appraisal of the Rotating-Disc Process from Laboratory and Pilot-Scale Studies

摘要

The rotating-disc process was used successfully on the laboratory scale and monohydric phenol and thiocyanate were effectively removed at organic loadings comparable with those obtained with the activated-sludge (AS) process. It was found to be more resilient than the AS process to some types of disturbances viz. acidic influents, mechanical breakdowns and the sudden surges in hydraulic or organic load. Scaling the process up to pilot plant scale reduced its efficiency. The organic loading per unit area of the disc surface was found to be a fundamental design parameter. Increasing the disc diameter from 23 to 48 cm reduced the maximum organic loading by about a half. The process was found to be no cheaper to run than the AS process, and its higher capital cost made it less attractive economically.