| Currently China has imported huge amount of crude oil torelieveitsproblem of limited oil reserve, however, due to the difference of the oil quality, some of crude oil are extra-heavy ones with high density, rich sulfur?nitrogen metal and acid. Water used to process this kind of crude oil is highly polluted and will be with highsulfur and salt contents which has lower biodegradability. The project of Guangdong Petrol is exactly about this type of crude oil. The polluted water brought by oil refinerycontains high toxicBenzene Series Compounds and Polycyclic Aromatic Hydrocarbonswhichare difficult to degrade. Ester level is also higher in this type of polluted water which is very toxic and difficult to deal with by biodegradation, among which the salt inside is even more difficult for biodegradation. The polluted water will pose a big impact on the environment without effective treatment. The study of this paper is quite meaningful for oil refinery enterprises given the fact that there'll be more and more imported oil in the future.There's no solid experience for treating this specific type of polluted water in China. This thesisfocuses on the study for the treatment ofpolluted water with high salt, sulfur and COD brought by oil processing.A solid processing procedure and related parameters are thus proposed.The Biological activated charcoal technology is improved comparing to the traditional procedure through tests, followed by adopting the Fenton Advanced Oxidation Processes to avoid big loss of halophile in the polluted water.The feasibility and dependability of the procedure are validated throughthe experiment.Removal rate for COD could reach 98.5%, while close to 100% for ammonia nitrogen and oily materials. The water quality after treatment can come up to the 1st level standard of the local regulation Discharge Limits of Water Pollutants (DB4426-2001). |
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