page 1034 |
Previous | 1 of 12 | Next |
|
|
Loading content ...
FREQUENCY DISTRIBUTIONS OF SECONDARY AND TERTIARY EFFLUENT PARAMETERS Joseph A. Fitzpatrick, Assistant Professor Charles L. Swanson, Research Assistant Northwestern University Evanston, Illinois 60201 Wesley O. Pipes, Professor Department of Biological Sciences Drexel University Philadelphia, Pennsylvania 19104 INTRODUCTION Over the past few years many wastewater treatment plants have been adding some type of filtration process following secondary treatment in order to achieve additional removal of suspended solids and BOD. The designs used for these tertiary wastewater filters have mostly been adapted from experience with the design of filters for water treatment plants. Many questions about how performance is related to design and operation of the filters, performance of the secondary process preceeding the filter, and wastewater characteristics are yet to be answered. One way to study full-scale filter performance is to compare the quality of a secondary effluent with a tertiary effluent and the quality of tertiary effluents produced by different filters. These comparisons should be made on a statistical basis. This requires a knowledge of the frequency distributions of effluent parameters. Knowledge of these frequency distributions is also essential for the proper design of data collection programs for survey and enforcement monitoring, and for establishment of effluent limitations. There are several reports in the literature in which the frequency distributions for effluent parameters have been characterized to some extent [1-3J. Hoogerhyde [1] indicated that tertiary filter effluent suspended solids are normally distributed. Dean and Forsythe [3] have argued that effluent parameters from a wide variety of treatment processes should have a log-normal distribution. There are also other frequency distributions which might adequately characterize effluent parameters. A recent study at Northwestern University has the objective of examining the performance of several tertiary wastewater filters of different designs operating under various conditions. In the first part of the study the distributional properties of the effluent quality parameters are characterized. This chapter deals with the distributional properties of secondary and tertiary process flow, total and soluble five-day biochemical oxygen demand (BOD,) for secondary and tertiary processes at two different wastewater treatment plants. DATA COLLECTION The two plants are the Addison, Illinois North and South Plants operated under authority of the Village of Addison Department of Public Works. Secondary treatment at the South Plant consists of a trickling filter and an activated sludge process in parallel The combined secondary effluent passes through an equalization basin before entering the filters. The tertiary process consists of seven Smith and Loveless dual-media filter units operated in parallel. The North Plant has a contact stabilization process followed by three Smith and Loveless filters. There are no storage or equalization tanks between the secondary and tertiary processes at the North Plant. Filter design data for both plants are shown in Table I. Average flow to each plant is approximately 2 mgd. Average filter flow rate at the North Plant is almost twice 1034
Object Description
Purdue Identification Number | ETRIWC197694 |
Title | Frequency distributions of secondary and tertiary effluent parameters |
Author |
Fitzpatrick, Joseph A. Swanson, Charles L. Pipes, Wesley O. |
Date of Original | 1976 |
Conference Title | Proceedings of the 31st Industrial Waste Conference |
Conference Front Matter (copy and paste) | http://e-archives.lib.purdue.edu/u?/engext,27048 |
Extent of Original | p. 1034-1045 |
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 | 2009-07-08 |
Capture Device | Fujitsu fi-5650C |
Capture Details | ScandAll 21 |
Resolution | 300 ppi |
Color Depth | 8 bit |
Description
Title | page 1034 |
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 |
Capture Device | Fujitsu fi-5650C |
Capture Details | ScandAll 21 |
Transcript | FREQUENCY DISTRIBUTIONS OF SECONDARY AND TERTIARY EFFLUENT PARAMETERS Joseph A. Fitzpatrick, Assistant Professor Charles L. Swanson, Research Assistant Northwestern University Evanston, Illinois 60201 Wesley O. Pipes, Professor Department of Biological Sciences Drexel University Philadelphia, Pennsylvania 19104 INTRODUCTION Over the past few years many wastewater treatment plants have been adding some type of filtration process following secondary treatment in order to achieve additional removal of suspended solids and BOD. The designs used for these tertiary wastewater filters have mostly been adapted from experience with the design of filters for water treatment plants. Many questions about how performance is related to design and operation of the filters, performance of the secondary process preceeding the filter, and wastewater characteristics are yet to be answered. One way to study full-scale filter performance is to compare the quality of a secondary effluent with a tertiary effluent and the quality of tertiary effluents produced by different filters. These comparisons should be made on a statistical basis. This requires a knowledge of the frequency distributions of effluent parameters. Knowledge of these frequency distributions is also essential for the proper design of data collection programs for survey and enforcement monitoring, and for establishment of effluent limitations. There are several reports in the literature in which the frequency distributions for effluent parameters have been characterized to some extent [1-3J. Hoogerhyde [1] indicated that tertiary filter effluent suspended solids are normally distributed. Dean and Forsythe [3] have argued that effluent parameters from a wide variety of treatment processes should have a log-normal distribution. There are also other frequency distributions which might adequately characterize effluent parameters. A recent study at Northwestern University has the objective of examining the performance of several tertiary wastewater filters of different designs operating under various conditions. In the first part of the study the distributional properties of the effluent quality parameters are characterized. This chapter deals with the distributional properties of secondary and tertiary process flow, total and soluble five-day biochemical oxygen demand (BOD,) for secondary and tertiary processes at two different wastewater treatment plants. DATA COLLECTION The two plants are the Addison, Illinois North and South Plants operated under authority of the Village of Addison Department of Public Works. Secondary treatment at the South Plant consists of a trickling filter and an activated sludge process in parallel The combined secondary effluent passes through an equalization basin before entering the filters. The tertiary process consists of seven Smith and Loveless dual-media filter units operated in parallel. The North Plant has a contact stabilization process followed by three Smith and Loveless filters. There are no storage or equalization tanks between the secondary and tertiary processes at the North Plant. Filter design data for both plants are shown in Table I. Average flow to each plant is approximately 2 mgd. Average filter flow rate at the North Plant is almost twice 1034 |
Resolution | 300 ppi |
Color Depth | 8 bit |
Tags
Comments
Post a Comment for page 1034