NOTE: This item is not available outside the Texas A&M University network. Texas A&M affiliated users who are off campus can access the item through NetID and password authentication or by using TAMU VPN. Non-affiliated individuals should request a copy through their local library's interlibrary loan service.
Nitrification and heavy metal removal in the activated sludge treatment process
dc.contributor.advisor | Hann Jr, Roy W. | |
dc.creator | Richards, Paul Allen | |
dc.date.accessioned | 2020-08-21T22:00:54Z | |
dc.date.available | 2020-08-21T22:00:54Z | |
dc.date.issued | 1976 | |
dc.identifier.uri | https://hdl.handle.net/1969.1/DISSERTATIONS-614209 | |
dc.description | Vita. | en |
dc.description.abstract | A bench-scale, continuous flow, completely mixed activated sludge system was used to investigate the relationship of nitrification and other system parameters to heavy metal removal in the activated sludge waste treatment process. The heavy metals studied were chromium, at concentrations ranging from 0.1 to 10.0 milligrams per liter, and silver, at concentrations ranging from 0.1 to 0.5 milligram per liter in settled primary domestic sewage. Analyses performed on the influent, mixed liquor, return sludge, and effluent included heavy metal concentration, pH, dissolved oxygen, temperature, suspended solids, chemical oxygen demand, nitrogen species, alkalinity, and other system control parameters. Results indicate that the sludge wasting rate is directly related to heavy metal removal. Nitrification is only indirectly related since sludge wasting controls sludge age which in turn determines the degree of nitrification. A theory for the mechanisms contributing to heavy metal removal is developed. The capability of activated sludge to concentrate heavy metals is the main phenomenon involved. Sludge wasting is the key mechanism affecting heavy metal removal from the system. | en |
dc.format.extent | x, 172 leaves | en |
dc.format.medium | electronic | en |
dc.format.mimetype | application/pdf | |
dc.language.iso | eng | |
dc.rights | This thesis was part of a retrospective digitization project authorized by the Texas A&M University Libraries. Copyright remains vested with the author(s). It is the user's responsibility to secure permission from the copyright holder(s) for re-use of the work beyond the provision of Fair Use. | en |
dc.rights.uri | http://rightsstatements.org/vocab/InC/1.0/ | |
dc.subject | Heavy metals | en |
dc.subject | Nitrification | en |
dc.subject | Sewage sludge | en |
dc.subject | Analysis | en |
dc.subject | Civil Engineering | en |
dc.subject.classification | 1976 Dissertation R517 | |
dc.subject.lcsh | Nitrification | en |
dc.subject.lcsh | Sewage sludge | en |
dc.subject.lcsh | Analysis | en |
dc.subject.lcsh | Heavy metals | en |
dc.title | Nitrification and heavy metal removal in the activated sludge treatment process | en |
dc.type | Thesis | en |
thesis.degree.grantor | Texas A&M University | en |
thesis.degree.name | Doctor of Philosophy | en |
dc.contributor.committeeMember | Reynolds, Tom D. | |
dc.contributor.committeeMember | Runkles, Jack R. | |
dc.contributor.committeeMember | Wolf, Harold W. | |
dc.type.genre | dissertations | en |
dc.type.material | text | en |
dc.format.digitalOrigin | reformatted digital | en |
dc.publisher.digital | Texas A&M University. Libraries | |
dc.identifier.oclc | 2693107 |
Files in this item
This item appears in the following Collection(s)
-
Digitized Theses and Dissertations (1922–2004)
Texas A&M University Theses and Dissertations (1922–2004)
Request Open Access
This item and its contents are restricted. If this is your thesis or dissertation, you can make it open-access. This will allow all visitors to view the contents of the thesis.