Performance Evaluation of the Town of Monterery Wastewater Treatment Plant Utilizing Subsurface Flow Constructed Wetlands

dc.contributor.authorKiracofe, Brandon Deanen
dc.contributor.committeechairNovak, John T.en
dc.contributor.committeememberBoardman, Gregory D.en
dc.contributor.committeememberRandall, Clifford W.en
dc.contributor.departmentEnvironmental Engineeringen
dc.date.accessioned2014-03-14T20:41:44Zen
dc.date.adate2000-07-21en
dc.date.available2014-03-14T20:41:44Zen
dc.date.issued2000-07-19en
dc.date.rdate2001-07-21en
dc.date.sdate2000-07-21en
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
dc.description.degreeMaster of Scienceen
dc.identifier.otheretd-07212000-14300031en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-07212000-14300031/en
dc.identifier.urihttp://hdl.handle.net/10919/34093en
dc.publisherVirginia Techen
dc.relation.haspartBketd1.pdfen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectmedia cloggingen
dc.subjectconstructed wetlandsen
dc.subjectsubsurface flowen
dc.subjectbisulfideen
dc.subjectanaerobic treatmenten
dc.titlePerformance Evaluation of the Town of Monterery Wastewater Treatment Plant Utilizing Subsurface Flow Constructed Wetlandsen
dc.typeThesisen
thesis.degree.disciplineEnvironmental Planningen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen

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