Division of the industry into subcategories provides a mechanism for addressing processes, products, and other variations that result in distinct wastewater characteristics. The aluminum forming industry is comprised of separate and distinct processes with enough variability in products and wastes to require categorization into a number of discrete subcategories. The individual processes, wastewater characteristics, and treatability comprise the most significant factors in the subcategorization of this complex industry. Other factors either served to support and substantiate the subcategorization or were shown to be inappropriate bases for subcategorization. From this evaluation, the following are the established subcategories:
1. Rolling with neat oils
2. Rolling with emulsions
5. Drawing with neat oils
Each industrial subcategory is broken into "core" and "additional allocation" operations. The core is defined as those operations that always occur in the subcategory or do not affect the wastewater characteristics from the subcategory facilities (e.g., dry operations, zero-pollutant-allocation operations, or operations that contribute insignificant pollutants and wastewater volume in comparison with other streams). These operations that do not contribute to the wastewater characteristics will not occur at every plant, which should not affect wastewater treatment.
Operations that may affect wastewater characteristics but are not included in the core are classified as additional allocation operations. These are ancillary operations involving discharged wastewater streams of significant pollutant concentrations and flows that may or may not be present at any one facility. If an additional allocation operation occurs at a facility, the wastewater from the operation would occur in addition to the core wastewater, with a subsequent modification to the performance expected from a treatment facility. The most common additional allocation operations are as follows:
1. Cooling water from direct chill casting
2. Quench water from heat treatment
The designation of core and additional allocation operations is listed by subcategory in Table 5.1. More than one subcategory may be associated with a specific facility. A brief description of the subcategories follows.
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