{"title":"Forces Acting on Floc and Strength of Floc","authors":"T. Matsuo, H. Unno","doi":"10.1061/JEEGAV.0001174","DOIUrl":"https://doi.org/10.1061/JEEGAV.0001174","url":null,"abstract":"A theoretical and experimental investigation was attempted to determine floc strength quantitatively. Some formulas were presented to evaluate the hydrodynamical forces acting on a suspended floc particle, depending on the flow conditions and the particle Reynolds number values. The assumption of a pseudosurface tension allowed the calculation of a value for the inherent strengths of flocs.","PeriodicalId":17335,"journal":{"name":"Journal of the Environmental Engineering Division","volume":"25 1","pages":"527-545"},"PeriodicalIF":0.0,"publicationDate":"1981-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76838220","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Erratum for “Index To Evaluate Lake Restoration”","authors":"D. Porcella, S. Peterson, D. P. Larsen","doi":"10.1061/JEEGAV.0001186","DOIUrl":"https://doi.org/10.1061/JEEGAV.0001186","url":null,"abstract":"","PeriodicalId":17335,"journal":{"name":"Journal of the Environmental Engineering Division","volume":"1 1","pages":"607-607"},"PeriodicalIF":0.0,"publicationDate":"1981-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88907727","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Verification of Ocean Outfall Performance Predictions","authors":"I. Wallis","doi":"10.1061/JEEGAV.0001164","DOIUrl":"https://doi.org/10.1061/JEEGAV.0001164","url":null,"abstract":"It is concluded that the computer models are reasonably successful at predicting initial dilution and the position of effluent field with slow ocean currents, and generally provide a conservative indication of the values with stronger currents.","PeriodicalId":17335,"journal":{"name":"Journal of the Environmental Engineering Division","volume":"32 1","pages":"421-424"},"PeriodicalIF":0.0,"publicationDate":"1981-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83656781","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Ground-Water Quality at Rapid Infiltration Site","authors":"James V. Olson, P. E. Levine, R. Crites","doi":"10.1061/JEEGAV.0001095","DOIUrl":"https://doi.org/10.1061/JEEGAV.0001095","url":null,"abstract":"The ground water quality beneath a 30-yr old rapid infiltration was studied over a 12-month period. The system receives primary effluent and treats it to a very high quality through the land treatment process. The flow of treated water passes through 10 m to 20 m of permeable sands and then moves laterally off the site. This shallow ground water is not used as a water supply and does not affect the deeper, separate aquifers. A 96% BOD and TOC removal was achieved. Because of the high BOD to nitrogen ratio, the relatively low loading rate of 15.4 m/yr, and the moderate climate, nitrogen was removed by nitrification and denitrification in the soil. The average nitrogen removal was 93%. Phosphorus removal was 30%. Trace element removal varied, but shallow ground-water levels were generally lower than guidelines established for unrestricted irrigation.","PeriodicalId":17335,"journal":{"name":"Journal of the Environmental Engineering Division","volume":"7 1","pages":"885-899"},"PeriodicalIF":0.0,"publicationDate":"1980-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88312065","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Modeling Pollution in Strait of Maracaibo","authors":"Gustavo Parra-Pardi","doi":"10.1061/jeegav.0001101","DOIUrl":"https://doi.org/10.1061/jeegav.0001101","url":null,"abstract":"In 1974, a far-reaching research program was undertaken to solve the problems of pollution in the Lake Maracaibo system, a partially mixed estuary, and specifically to draw up a master plan to control and manage its water quality. Separate analyses of organic and bacterial pollution were carried out, using a combination of modeling techniques. Mathematical models which simulated the essential phenomena of these two types of pollution were calibrated. The hydrological balance of the lake was used to define the range of runoff values to be used in the design of control measures. The pollution loads were estimated, the self-purification factors calibrated, a wide range of simulated situations were analyzed, and sets of control curves of organic and bacterial pollution were prepared. Among the more significant findings is a deoxygenation rate of 0.02 and a bacterial disappearance rate of 0.6 in the strait.","PeriodicalId":17335,"journal":{"name":"Journal of the Environmental Engineering Division","volume":"65 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"1980-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83750476","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Closure to “Kinetics of Bacterial Deactivation with Chlorine”","authors":"R. Selleck, Harvey F. Collins, B. Saunier","doi":"10.1061/JEEGAV.0001085","DOIUrl":"https://doi.org/10.1061/JEEGAV.0001085","url":null,"abstract":"","PeriodicalId":17335,"journal":{"name":"Journal of the Environmental Engineering Division","volume":"1 1","pages":"1000-1002"},"PeriodicalIF":0.0,"publicationDate":"1980-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82120893","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Simulation of Lime-Soda Softening","authors":"L. Liang, Henry G. Sideropoulos, I. Wei","doi":"10.1061/jeegav.0001099","DOIUrl":"https://doi.org/10.1061/jeegav.0001099","url":null,"abstract":"A computer model for lime-soda softening has been developed based on the solution of simultaneous chemical equilibrium equations. The effects of ionic strength and temperature on the dissociation constants, solubility products, and activity coefficients are accounted for as well as the effect on magnesium on the solubility product of calcium carbonate. Synthetic waters with systematic variations in composition were lime softened in the laboratory. Qualitatively, the experimental data agree well with the results of computer simulation. Further research is necessary to improve the numerical accuracy of the model.","PeriodicalId":17335,"journal":{"name":"Journal of the Environmental Engineering Division","volume":"202 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"1980-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86242643","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
G. J. Brown, T. Viraraghavan, A. Cocci, R. Landine, Kuran-Chow Lin
{"title":"Lime Use in Anaerobic Filters","authors":"G. J. Brown, T. Viraraghavan, A. Cocci, R. Landine, Kuran-Chow Lin","doi":"10.1061/JEEGAV.0001073","DOIUrl":"https://doi.org/10.1061/JEEGAV.0001073","url":null,"abstract":"The establishment and maintenance of conditions suitable for optimum biological metabolism plays a larger role in the success or failure of anaerobic reactors than other factors such as loading rate. The parameters of pH, temperature, alkalinity, and volatile acids need special attention. The optimum pH and alkalinity for methane fermentation is commonly reported to be 7.0 and 2,000 mg/1respectively. The concentration of volatile acids is generally well below 2,000 mg/1 when the system is in balance. Unbalanced conditions frequently occur during the start-up of an anaerobic reactor and when conditions abruptly change.","PeriodicalId":17335,"journal":{"name":"Journal of the Environmental Engineering Division","volume":"8 1","pages":"837-839"},"PeriodicalIF":0.0,"publicationDate":"1980-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87389840","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Discussion of \"Time Series Modeling of Chicago Particulates\"","authors":"S. D. Koppula","doi":"10.1061/JEEGAV.0001060","DOIUrl":"https://doi.org/10.1061/JEEGAV.0001060","url":null,"abstract":"","PeriodicalId":17335,"journal":{"name":"Journal of the Environmental Engineering Division","volume":"38 1","pages":"678-678"},"PeriodicalIF":0.0,"publicationDate":"1980-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91264041","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Discussion of “Water Defluoridation with Activated Alumina”","authors":"K. Bulusu, B. Pathak","doi":"10.1061/JEEGAV.0001038","DOIUrl":"https://doi.org/10.1061/JEEGAV.0001038","url":null,"abstract":"","PeriodicalId":17335,"journal":{"name":"Journal of the Environmental Engineering Division","volume":"49 1","pages":"466-469"},"PeriodicalIF":0.0,"publicationDate":"1980-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79971698","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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