Table 732 Subcategories Of The Petroleum Refining Industry Reflecting Significant Differences In Wastewater Characteristics

Topping: Topping and catalytic reforming whether the facility includes any other process in addition to topping and catalytic process. This subcategory is not applicable to facilities that include thermal processes (e.g., coking and visbreaking) or catalytic cracking.

Cracking: Topping and cracking, whether the facility includes any processes in addition to topping and cracking, unless specified in one of the following subcategories listed. Petrochemical: Topping, cracking, and petrochemical operations, whether the facility includes any process in addition to topping, cracking, and petrochemical operationsa, except lube oil manufacturing operations. Lube: Topping, cracking, and lube oil manufacturing processes, whether the facility includes any process in addition to topping, cracking, and lube oil manufacturing processes, except petrochemical operations.a Integrated: Topping, cracking, lube oil manufacturing processes, and petrochemical operations, whether the facility includes any processes in addition to topping, cracking, lube oil manufacturing processes, and petrochemical operations.a

Source: U.S. Environmental Protection Agency (EPA), 1980, Treatability manual, Vol. II—Industrial descriptions, Sec. II.14—Petroleum refining, EPA-600/8-80-042b (Washington, D.C. [July]).

Notes: aThe term petrochemical operations means the production of second generation petrochemicals (i.e., alcohols, ketones, cumene, and styrene) or first generation petrochemical and isomerization products (i.e., benzene/toluene/xylene [BTX], olefins, and cyclohexane) when 15% or more of refinery production is as first generation petrochemicals and isomerization products.

tion due to their potential environmental toxicity (U.S. EPA 1980). Five refinery subcategories, based on throughputs and process capacities, delineate information on waste-water characteristics as defined in Table 7.3.2. Table 7.3.3 presents ranges and median loadings in raw wastewater of conventional pollutants for the petroleum refining industry subcategories. Raw wastewater is the effluent from the oil separator, which is an integral part of refinery process operations for product and raw material recovery prior to wastewater treatment. Table 7.3.4 lists the toxic pollutants that have been measured in wastewater generated at petroleum refineries; no concentration data are included.

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