Abstract
An oil sludge from wastewater treatment in petroleum industry has been studied as raw material for the preparation of a filter medium being used in a bed coalescence process for oil removal from oil-contaminated wastewater. This preparation was realized by activation with carbon dioxide at a high temperature and produced a new filter medium, named M-1. The M-1 was tested for removing oil from an oil-contaminated wastewater, in comparison with commonly used filter mediums such as activated carbon, polypropylene and ceramsite. It has been found that the M-1 was a much more effective filter medium for oil removal than polypropylene and ceramsite, and was much cheaper than activated carbon. In addition, an infrared spectrum study showed that the mechanism of the M-1 in bed coalescence for oil removal might be due to collision coalescence. Since operation cost is paid a great attention, M-1 could be a good substitute for activated carbon as a filter medium in bed coalescence for oil removal from wastewater.
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