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dc.contributor.authorKiracofe, Brandon Deanen_US
dc.date.accessioned2014-03-14T20:41:44Z
dc.date.available2014-03-14T20:41:44Z
dc.date.issued2000-07-19en_US
dc.identifier.otheretd-07212000-14300031en_US
dc.identifier.urihttp://hdl.handle.net/10919/34093
dc.description.abstractField tests were conducted and historical operating data were evaluated to assess the performance of the Monterey WWTP utilizing subsurface flow (SF) constructed wetlands. Previous work with SF wetlands has demonstrated adequate, but variable removal of organic matter, suspended solids, and nitrogen. Few research studies have observed the generation of compounds in the wetlands that affect other treatment processes, specifically reduced compounds that contribute to the chlorine demand. This study attempts not only to distinguish the factors leading to the inadequate performance of the SF wetlands in removing organic matter and nitrogen, but also to identify the cause of the frequent occurrences of a nondetectable chlorine residual in the chlorine contact tank at the Monterey WWTP. Collection and analysis of historical operating data from January 1998 to May 2000 revealed a constantly decreasing removal of carbonaceous biochemical oxygen demand (CBOD5) by the SF wetlands and a poor removal of ammonia-N throughout the system. The decreasing removal of CBOD5 appeared to be caused by clogging of the wetland bed media by accumulated solids. The inability to remove the accumulated solids by pumping was shown. Analysis of field data also showed that the SF wetlands removed 88% of the influent TSS and 71% of the influent CBOD5, while experiencing a 18% increase in ammonia-N. Bisulfide produced in the anaerobic wetland beds accounted for 95% of the chlorine lost in contact tank. The variable production of sulfide is the cause of the frequent nondetectable chlorine concentrations observed. The results of this study suggest that chemical costs of chlorine and sulfur dioxide may be greatly reduced if bisulfide can be removed before chlorination. Also, the use of large rocks as media in SF wetland beds may significantly reduce the physical and biological removal of organic matter.en_US
dc.publisherVirginia Techen_US
dc.relation.haspartBketd1.pdfen_US
dc.rightsI hereby grant to Virginia Tech or its agents the right to archive and to make available my thesis or dissertation in whole or in part in the University Libraries in all forms of media, now or hereafter known. I retain all proprietary rights, such as patent rights. I also retain the right to use in future works (such as articles or books) all or part of this thesis or dissertation.en_US
dc.subjectand media cloggingen_US
dc.subjectconstructed wetlandsen_US
dc.subjectsubsurface flowen_US
dc.subjectbisulfideen_US
dc.subjectanaerobic treatmenten_US
dc.titlePerformance Evaluation of the Town of Monterery Wastewater Treatment Plant Utilizing Subsurface Flow Constructed Wetlandsen_US
dc.typeThesisen_US
dc.contributor.departmentEnvironmental Engineeringen_US
dc.description.degreeMaster of Scienceen_US
thesis.degree.nameMaster of Scienceen_US
thesis.degree.levelmastersen_US
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen_US
thesis.degree.disciplineEnvironmental Planningen_US
dc.contributor.committeechairNovak, John T.en_US
dc.contributor.committeememberBoardman, Gregory D.en_US
dc.contributor.committeememberRandall, Clifford W.en_US
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-07212000-14300031/en_US
dc.date.sdate2000-07-21en_US
dc.date.rdate2001-07-21
dc.date.adate2000-07-21en_US


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