Record Display for the EPA National Library Catalog


OLS Field Name OLS Field Data
Main Title Performance of trickling filter plants : reliability, stability and variability {Microfiche} /
Author Haugh, Richard ; Niku, Salar ; Schroeder, Edward D. ; Tchobanoglous, George
Other Authors
Author Title of a Work
Haugh, Richard.
CORP Author California Univ., Davis. Dept. of Civil Engineering.;Municipal Environmental Research Lab., Cincinnati, OH.
Publisher U.S. Environmental Protection Agency, Municipal Environmental Research Laboratory : Center for Environmental Research Information {distributor},
Year Published 1981
Report Number EPA-R-805097; EPA-600/2-81-228
Stock Number PB82-108143
Subjects Trickling filters ; Sewage disposal plants--United States ; Effluent quality--United States
Additional Subjects Sewage treatment ; Trickling filters ; Biochemical oxygen demand ; Performance evaluation
Library Call Number Additional Info Location Last
NTIS  PB82-108143 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. 01/01/1988
Collation 111 p. : ill. ; 28 cm.
Effluent quality variability from trickling filters was examined in this study by statistically analyzing daily effluent BOD5 and suspended solids data from 11 treatment plants. Summary statistics (mean, standard deviation, etc.) were examined to determine the general characteristics of those data. Distributions of most effluent data were skewed to the right, and daily suspended solids data generally exhibited more variation than daily BOD5 data. Five probability distribution functions, chosen through experience and the literature, were tested to determine which would be best used to describe daily 7-day average and 30-day average effluent data distributions. Three distributions, two parameter empirical, gamma and lognormal were found to be adequate with the lognormal being preferred because of ease of application. Daily effluent BOD5 and suspended solids data were found to contain both random and non-random components. Weekly cycles were found in about half the plants studied and significant month to month variation in effluent quality was found in every plant. Effluent BOD and suspended solids concentrations were higher in winter than in summer when pooled data from all plants was examined. Multiple regression analysis was used to determine the effects of various process parameters on effluent quality. In general, primary effluent BOD5 and suspended solids concentrations and wastewater temperature had the greatest effect. Variation due to measurement effort was estimated to be 5 to 70 percent and 11 to 78 percent for effluent BOD5 and suspended solids values, respectively. Methods for incorporating statistical concepts into trickling filter design and operation were discussed.
Caption title. "Sep. 1981." "EPA-600/2-81-228." Microfiche.