AbstractThe design and pilot testing of a deep fixed bed/attached growth high rate bioreactor (HRB) for treatment and disposal of refinery oily sludges and biosolids are described. The HRB technology is being jointly developed by Texaco Inc. and StoneWebster Engineering Corporation to allow for the processing of refinery oily sludges, biosolids, and contaminated soils.A key feature of the technology is its integral combination of dewatering, landfarming, and digestion operations. In essence, the technology operates as a combination of landfarm, aerobic digester, and trickling filter for semi‐solids/sludges. The system provides biological degradation of wastes, and features optimal air, water and/or solids recycling, and ease of maintenance. The technology is covered by three separate patents and is particularly applicable at facilities where regulations, climatic conditions, and/or land availability limit the use of conventional land‐based units.This paper reviews current and proposed regulations pertaining to “land‐banned” wastes, and presents our experience with regard to design and operation of the proto
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