Abstract
An entrapped mixed microbial cell process was used for the treatment of a synthetic phenol wastewater. Operational performance by stepping increase of organic loading rate, from 1.5 to 18 g COD/L/day, a long term operational behavior of an organic loading rate of 2.5–3.5 g COD/L/day and a quantitative shock loading including concentration and hydraulic shock loads were investigated. The system was operated under aerobic condition with a temperature of 25° ± 1°C. The process could achieve a TCOD and SCOD removal efficiencies of >90% and >93%, respectively, under a loading rate of less than 8 g COD/L/day. Also, the process could take both concentration and hydraulic (phenol) shock loads very effectively. A comparison of other biological treatment of phenol wastewater was made and was found that the phenol removal rate of 2.69 g/L/day could be achieved in this process which is 15–20% higher than the other studies. Thus, the process has a great potential to replace or upgrade the existing biological treatment process in removing the organic-toxic contaminated water and wastewater.
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