Ammonia-nitrogen removal from feedlot lagoon effluent by algae system
| dc.contributor.committeeMember | Parker, Nick C. | |
| dc.contributor.committeeMember | Ramsey, Ralph H. | |
| dc.contributor.committeeMember | Gregory, James M. | |
| dc.contributor.committeeMember | Mollhagen, Tony Ray | |
| dc.contributor.committeeMember | Moorhead, Daryl L. | |
| dc.creator | Ahn, Seyoung | |
| dc.date.available | 2015-03-05T23:55:05Z | |
| dc.date.issued | 1996-08 | |
| dc.description.abstract | A cattle feedlot lagoon effluent was used in both a batch and continuous flow system to determine the capability of an algae species, P. bohneri^ to remove ammonia-nitrogen fi-om the effluent. In the batch reactors containing P. bohneri, an initial ammonia-nitrogen concentration of 66 mg/L was reduced to below 0.5 mg/L within 3 days. The initial chlorophyll-a concentration of 500 ng/L increased to 2,000 ng/L within 6 days. In the continuous flow non-baffled reactor, the influent ammonia-nitrogen of 70 mg/L decreased to below 0.3 mg/L at the hydraulic retention time (HRT) of 4 days. In the continuous flow baffled reactor, the effluent ammonia-nitrogen concentration was 0.1 mg/L at the HRT of 4 days. In both the non-baffled and baffled reactors, the ammonia-nitrogen concentrations in the effluent were below 0.1 mg/L at the HRTs of 8 and 12 days. The non-baffled reactor had the maximum chlorophyll-a concentration of 4,153 |ig/L at the HRT of 12 days, while the highest chlorophyll-a concentration in the baffled reactor was 2,695 |ig/L at the HRT of 8 days. The non-baffled reactor had the highest nitrogen utilization rate (3.68 mg/L-day) by the P. bohneri culture at the HRT of 8 days. The baffles in the continuous flow system contributed to the lower effluent substrate concentration, but caused the rapid cell wash-out. Therefore, the cell production in the baffled reactor was lower than that in the non-baffled reactor. The algae production and the substrate removal models were developed on the basis of the relationship between microbial growth, substrate utilization, and a finite volume occupied by microbes. In the batch reactor study, the equation of predicted algal production fit measured data with an R value of 0.86 and was highly significant (a = 0.001). For the ammonia-nitrogen removal by the P. bohneri culture, the measured versus predicted resuhs were highly significant (a = 0.001) with an R^ value of 0.98. In the continuous flow, non-baffled reactor, the developed model predicted measured algal cell concentration with respect to hydraulic retention time with an R^ of 0.98 (a = 0.01). The experimental data and predicted results for the specific nitrogen utilization rate by P. bohneri agreed well (R^ = 0.94, a = 0.01) in the continuous flow, non-baffled system. | |
| dc.format.mimetype | application/pdf | |
| dc.identifier.uri | http://hdl.handle.net/2346/61319 | |
| dc.language.iso | eng | |
| dc.rights.availability | Unrestricted. | |
| dc.subject | Feedlot waste | |
| dc.subject | Feedlots -- Waste disposal | |
| dc.subject | Algae -- Biotechnology | |
| dc.subject | Cyanobacteria -- Biotechnology | |
| dc.title | Ammonia-nitrogen removal from feedlot lagoon effluent by algae system | en_US |
| dc.type | Dissertation | |
| thesis.degree.department | Civil Engineering | |
| thesis.degree.discipline | Civil Engineering | |
| thesis.degree.grantor | Texas Tech University | |
| thesis.degree.level | Doctoral | |
| thesis.degree.name | Doctor of Philosophy |