Abstract
In connection with increasing demand for oil shale phenols, Viru Chemistry Group, Ltd. has started co-processing of oils obtained at oil shale retorting in vertical retorts (the Kiviter process [1]) with oil fractions produced at Oil Plant of Narva Power Plants Ltd., where oil shale is processed in the solid heat carrier units (the Galoter process). However, co-treatment of oils has created some problems caused by an increase in the value of chemical oxygen demand (COD) in both the phenolic water and the dephenolized water. That, in turn, complicates biological treatment of the waters. A detailed investigation is needed to assess the influence of phenols and other organic compounds on COD of waters before and after dephenolation. Chemical oxygen demand, biological oxygen demand (BOD), total nitrogen content and total phosphorus content are the most significant parameters characterizing ecological danger of wastewaters. Among them COD is the most used. Under condition of joint discharge of municipal and industrial wastewaters into the soil or some water reservoir, COD value of biologically
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