Phosphorus reduction in dairy effluent through flocculation and precipitation
| dc.contributor | McInnes, Kevin | |
| dc.creator | Bragg, Amanda Leann | |
| dc.date.accessioned | 2005-02-17T21:09:14Z | |
| dc.date.accessioned | 2017-04-07T19:49:51Z | |
| dc.date.available | 2005-02-17T21:09:14Z | |
| dc.date.available | 2017-04-07T19:49:51Z | |
| dc.date.created | 2003-12 | |
| dc.date.issued | 2005-02-17 | |
| dc.description.abstract | Phosphorus (P) is a pollutant in freshwater systems because it promotes eutrophication. The dairies in the North Bosque and its water body segments import more P than they export. Dairies accumulate P-rich effluent in lagoons and use the wastewater for irrigation. As more P is applied as irrigation than is removed by crops, P accumulates in the soil. During intense rainfall events, P enters the river with stormwater runoff and can become bio-available. Reducing the P applied to the land would limit P build up in the soil and reduce the potential for P pollution. Since wastewater P is associated with suspended solids (SS), the flocculants, poly-DADMAC and PAM, were used to reduce SS. To precipitate soluble P from the effluent, NH4OH was added to raise the pH. Raw effluent was collected from a dairy in Comanche County, TX, and stored in 190-L barrels in a laboratory at Texas A&M University. Flocculant additions reduced effluent P content by as much as 66%. Addition of NH4OH to the flocculated effluent raised the pH from near 8 to near 9, inducing P precipitation, further reducing the P content. The total P reduction for the best combination of treatments was 97%, a decrease from 76 to 2 mg L-1. If this level of reduction were achieved in dairy operations, P pollution from effluent application would gradually disappear. | |
| dc.identifier.uri | http://hdl.handle.net/1969.1/1646 | |
| dc.language.iso | en_US | |
| dc.publisher | Texas A&M University | |
| dc.subject | manure | |
| dc.subject | phosphorus | |
| dc.subject | flocculation | |
| dc.subject | precipitation | |
| dc.subject | dairy effluent | |
| dc.subject | eutrophication | |
| dc.subject | dairy wastewater treatment | |
| dc.title | Phosphorus reduction in dairy effluent through flocculation and precipitation | |
| dc.type | Book | |
| dc.type | Thesis |