Type of Document Master's Thesis Author Shugart, Steven Lee URN etd-07242012-040030 Title Phosphorus readsorption on Occoquan sediments Degree Master of Science Department Environmental Sciences and Engineering Advisory Committee
Advisor Name Title Hoehn, Robert C. Committee Chair Randall, Clifford W. Committee Member Sherrard, Joseph H. Committee Member Keywords
- phosphate readsorption
Date of Defense 1976-03-05 Availability restricted AbstractThe purpose of this investigation was to determine the extent of
phosphorus readsorption on Occoquan sediments and the amount of subsequent
removal because of settling of the particles with time. Occoquan
sediments were placed in six polyurethane cylinders and submerged. In two separate experiments, the cylinders were driven anaerobic,
which allowed phosphorus, previously bound in the sediments,
to release. The sediment—water system was then reaerated and mixed
with a porous air diffuser. Analyses were conducted before and after
the mixing period.
From the results obtained, the following conclusions were drawn:
phosphate readsorption occurred upon mixing the system, and as the
turbidity decreased, the phosphate concentration decreased; phosphate readsorption occurred in a two—step process; each suspension tended
toward equilibrium after mixing; interstitial waters contributed significant
amounts of phosphorus upon mixing of the sediment—water
systems; Occoquan sediments released variable amounts of phosphorus
even within samples from similar sites; sediments from the Occoquan
Creek arm contained less phosphorus than Bull Run sediments; and
sediments low in phosphorus concentrations removed greater amounts
of phosphorus in a shorter period of time.
Filename Size Approximate Download Time (Hours:Minutes:Seconds)
28.8 Modem 56K Modem ISDN (64 Kb) ISDN (128 Kb) Higher-speed Access LD5655.V855_1976.S55.pdf 3.33 Mb 00:15:23 00:07:55 00:06:55 00:03:27 00:00:17next to an author's name indicates that all files or directories associated with their ETD are accessible from the Virginia Tech campus network only.
If you have questions or technical problems, please Contact DLA.