VTechWorks staff will be away for the winter holidays starting Tuesday, December 24, 2024, through Wednesday, January 1, 2025, and will not be replying to requests during this time. Thank you for your patience, and happy holidays!
 

Biological and physical treatment of crab processing industry wastewaters

Simple item page
dc.contributor.authorWolfe, Christopher L.en
dc.contributor.departmentEnvironmental Engineeringen
dc.date.accessioned2014-03-14T21:42:16Zen
dc.date.adate2009-08-04en
dc.date.available2014-03-14T21:42:16Zen
dc.date.issued1993en
dc.date.rdate2009-08-04en
dc.date.sdate2009-08-04en
dc.description.abstractThe crab processing industry of the Chesapeake Bay region has, until recently, been able to dispose of their processing wastewaters by discharging them, largely untreated, directly to the receiving waters along which their plants are located. With the upcoming implementation of new NPDES discharge limits, this practice will no longer be possible. This study investigated the potential of two different technologies for treating the processing wastewaters. Bench-scale anaerobic contact type reactors were studied for effectiveness in the removal of organics from the processor’s wastewaters, and a pilot-scale countercurrent air stripping tower was studied for ammonia removal. Two anaerobic reactors which were fed retort process wastewater at F/M ratios of 0.35 and 0.25 lb COD/1b MLVSS/day, were found to achieve organics removals (on a BOD₅ basis) of 88% and 94% respectively. Similarly, a second pair of anaerobic reactors were fed a mixed wastewater, representative of a mechanized processing plant’s total wastewater flow, at F/M ratios of 0.10 and 0.07 lb COD/1b MLVSS/day. These reactors were found to achieve organics removals (on a BOD₅ basis) of 79% and 83% respectively. All four of the reactors were eventually shut down after exhibiting signs of failure. These failures were attributed to possible sodium and ammonia toxicity problems. The effectiveness of the air stripping tower in the removal of ammonia from retort process wastewater was tested in relation to liquid flow rate, influent temperature, and influent pH. A maximum ammonia removal of 71% was observed when treating a waste, with an influent temperature of 580C and pH level of 12.2, at an air-to-water ratio of approximately 825 ft³/gal. Similarly, an ammonia removal rate of 67% was observed while treating a waste, with an influent temperature of 650°C and pH level of 11.0, at an air-to-water ratio of approximately 412 ft³/gal.en
dc.description.degreeMaster of Scienceen
dc.format.extentviii, 135 leavesen
dc.format.mediumBTDen
dc.format.mimetypeapplication/pdfen
dc.identifier.otheretd-08042009-040526en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-08042009-040526/en
dc.identifier.urihttp://hdl.handle.net/10919/44178en
dc.language.isoenen
dc.publisherVirginia Techen
dc.relation.haspartLD5655.V855_1993.W643.pdfen
dc.relation.isformatofOCLC# 29046724en
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subject.lccLD5655.V855 1993.W643en
dc.subject.lcshAnaerobic bacteriaen
dc.subject.lcshCrabs -- Chesapeake Bay (Md and Va)en
dc.subject.lcshCrabsen
dc.subject.lcshFishery processing industries -- Waste disposal -- Chesapeake Bay Region (Md and Va)en
dc.subject.lcshSewage sludge digestionen
dc.subject.lcshWater reuseen
dc.subject.lcshWater -- Purification -- Air stripping processen
dc.titleBiological and physical treatment of crab processing industry wastewatersen
dc.typeThesisen
dc.type.dcmitypeTexten
thesis.degree.disciplineEnvironmental Planningen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen

Files

Original bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
LD5655.V855_1993.W643.pdf
Size:
5.15 MB
Format:
Adobe Portable Document Format
Description:
Download

Collections

Masters Theses