Removal of Pollutants by Two Types of Skimming Systems

Pollutant Raw Wastewater Treated Effluent

Percent Removal

API System?

Oil and grease (mg/L) 230,000

Chloroform (mg/L) 23

Methylene chloride (mg/L) 13

Naphthalene (mg/L) 2300

N-nitrosodiphenylamine (mg/L) 59,000

Bis(2-ethylhexyl) phthalate (mg/L) 11,000

Butylbenzyl phthalate (mg/L) BDL

Di-n-octyl phthalate (mg/L) 19

Anthracene-phenanthrene (mg/L) 16,000

Toluene (mg/L) 20

TEB Systemb

Oil and grease (mg/L) 2600

Chloroform (mg/L) BDL

Methylene chloride (mg/L) BDL

Naphthalene (mg/L) 1800

Bis (2-ethylhexyl) phthalate (mg/L) 1600

Diethyl phthalate (mg/L) 17

Anthracene-phenanthrene (mg/L) 140

BDL 12

BDL 180 27

BDL BDL 14 12

BDL BDL BDL 18

BDL BDL

>99c

>99c

71c 96c

Source: U.S. EPA, Development Document for Effluent Limitations Guidelines and Standards for the Aluminum Forming Point Source Category, Vols. 1 & 2, U.S. EPA, Washington, DC, 1984; U.S. EPA, Aluminum Forming Point Source Category, 2008. BDL, below detection limits; NM, not meaningful. a API, American Petroleum Institute oil-water separator. b TEB, thermal emulsion breaker. c Approximate value.

These costs were developed to reflect the conventional use of technologies in this industry. Several unit operation/unit process configurations have been analyzed for the cost of application of technologies and to select the best practicable control technology (BPT) and best applicable technology (BAT) level of treatment. The detailed presentation of the applicable treatment technologies, cost methodology, and cost data are available in the literature.1-4 Specifically the U.S. EPA Report W-83-13, "Cost Effectiveness Analysis of Effluent Guidelines and Standards for the Aluminum Forming Category" reports the results of a cost-effectiveness (CE) analysis of alternative water pollution control technologies for the aluminum forming category.4 The primary cost of interest in the U.S. EPA report is the total annualized cost in complying with the regulations incurred by industry. The 1983 costs can be easily updated to the current cost,1213 or any future costs using the cost indexes announced periodically by the U.S. Army Corps of Engineers (U.S. ACE)14 or Engineering News Record of McGraw-Hill Book Company, NY.

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