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Section 14. LAWS AND REGULATIONS CATEGORICAL PRETREATMENT STANDARDS: THE FORECASTING OF POTW REMOVALS OF POLLUTANTS AS A BASIS FOR REVISION OF STANDARDS John R. Milne, Project Engineer Leslie D. Rose, Supervision Civil Engineer Robert P. Miele, Head, Technical Services Department County Sanitation Districts of Los Angeles County Whittier, CA 90607 Untd a few years ago, each publicly owned treatment works (POTW) was permitted by state regulatory authorities to treat industrial wastewater only to the extent necessary to protect receiving waters. The Clean Water Act has now become the basis for categorical pretreatment standards for industry and these standards must be enforced by the POTW which serves the industry [ 1 ]. A new twist has been added to the rules, which adows, but does not require, a POTW to give allowances to industries for the discharge of poUutants which are removed in part by the POTW. The idea is simple in principle and apparently reasonable: If, for instance, a discharger is limited by a pretreatment standard to a concentration of 1 mg/1 of copper in the effluent which he discharges to the sewer, and if the POTW removes 80% of the copper entering its plant, then the POTW may adow the firm to discharge as much as 5 mg/1. Application of the principle, as pointed out by Lordi [2] and others, turns out to be neither simple nor equitable. There are three problems: reliably predicting so-called "consistent removals," imperfect knowledge about the relationship between influent and effluent podutant concentrations, and vagueness in the regulations. SCOPE OF THE STUDY The present study was undertaken with the aim of determining the removals of trace constituents in the Los Angeles County Sanitation Districts' Joint OutfaU System, determining the variabdity of removals between treatment plants, developing methods for predicting them, and evaluating the desirability of requesting authority to grant allowances for removing them under the current regulations. The Joint Outfall System is comprised of five biological treatment plants ranging in capacity from 10-40 MGD each, and a primary plant to which they are tributary with a capacity of about 400 MGD. Because the primary plant is being upgraded with 200 MGD of secondary treatment capacity, the prediction of removals at it in the future is uncertain. However, it is hoped that a study of existing plants wdl enable a better evaluation of future options. Because alternative methods of calculating removals may be allowed with EPA approval, four different procedures were studied. In addition to evaluating removals themselves, an effort was made to evaluate their reliabdity as well in order to provide assurances that commitments to industry and regulatory authorities wdl be met. The prediction of removals is equivalent to predicting effluent concentrations when influent concentrations are known. Consequently, an effort was made to determine whether effluent concentrations are, in fact, dependent on influent concentrations. If there does 902
Object Description
Purdue Identification Number | ETRIWC198090 |
Title | Categorical pretreatment standards : the forecasting of POTW removals of pollutants as a basis for revision of standards |
Author |
Milne, John R. Rose, Leslie D. Miele, Robert P. |
Date of Original | 1980 |
Conference Title | Proceedings of the 35th Industrial Waste Conference |
Conference Front Matter (copy and paste) | http://earchives.lib.purdue.edu/u?/engext,31542 |
Extent of Original | p. 902-910 |
Collection Title | Engineering Technical Reports Collection, Purdue University |
Repository | Purdue University Libraries |
Rights Statement | Digital object copyright Purdue University. All rights reserved. |
Language | eng |
Type (DCMI) | text |
Format | JP2 |
Date Digitized | 2009-10-22 |
Capture Device | Fujitsu fi-5650C |
Capture Details | ScandAll 21 |
Resolution | 300 ppi |
Color Depth | 8 bit |
Description
Title | page 902 |
Collection Title | Engineering Technical Reports Collection, Purdue University |
Repository | Purdue University Libraries |
Rights Statement | Digital copyright Purdue University. All rights reserved. |
Language | eng |
Type (DCMI) | text |
Format | JP2 |
Capture Device | Fujitsu fi-5650C |
Capture Details | ScandAll 21 |
Transcript | Section 14. LAWS AND REGULATIONS CATEGORICAL PRETREATMENT STANDARDS: THE FORECASTING OF POTW REMOVALS OF POLLUTANTS AS A BASIS FOR REVISION OF STANDARDS John R. Milne, Project Engineer Leslie D. Rose, Supervision Civil Engineer Robert P. Miele, Head, Technical Services Department County Sanitation Districts of Los Angeles County Whittier, CA 90607 Untd a few years ago, each publicly owned treatment works (POTW) was permitted by state regulatory authorities to treat industrial wastewater only to the extent necessary to protect receiving waters. The Clean Water Act has now become the basis for categorical pretreatment standards for industry and these standards must be enforced by the POTW which serves the industry [ 1 ]. A new twist has been added to the rules, which adows, but does not require, a POTW to give allowances to industries for the discharge of poUutants which are removed in part by the POTW. The idea is simple in principle and apparently reasonable: If, for instance, a discharger is limited by a pretreatment standard to a concentration of 1 mg/1 of copper in the effluent which he discharges to the sewer, and if the POTW removes 80% of the copper entering its plant, then the POTW may adow the firm to discharge as much as 5 mg/1. Application of the principle, as pointed out by Lordi [2] and others, turns out to be neither simple nor equitable. There are three problems: reliably predicting so-called "consistent removals," imperfect knowledge about the relationship between influent and effluent podutant concentrations, and vagueness in the regulations. SCOPE OF THE STUDY The present study was undertaken with the aim of determining the removals of trace constituents in the Los Angeles County Sanitation Districts' Joint OutfaU System, determining the variabdity of removals between treatment plants, developing methods for predicting them, and evaluating the desirability of requesting authority to grant allowances for removing them under the current regulations. The Joint Outfall System is comprised of five biological treatment plants ranging in capacity from 10-40 MGD each, and a primary plant to which they are tributary with a capacity of about 400 MGD. Because the primary plant is being upgraded with 200 MGD of secondary treatment capacity, the prediction of removals at it in the future is uncertain. However, it is hoped that a study of existing plants wdl enable a better evaluation of future options. Because alternative methods of calculating removals may be allowed with EPA approval, four different procedures were studied. In addition to evaluating removals themselves, an effort was made to evaluate their reliabdity as well in order to provide assurances that commitments to industry and regulatory authorities wdl be met. The prediction of removals is equivalent to predicting effluent concentrations when influent concentrations are known. Consequently, an effort was made to determine whether effluent concentrations are, in fact, dependent on influent concentrations. If there does 902 |
Resolution | 300 ppi |
Color Depth | 8 bit |
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