Coupled Chemical/Biological Systems for Maximizing Phosphorus Removal from Natural Waters

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Material Information

Title:
Coupled Chemical/Biological Systems for Maximizing Phosphorus Removal from Natural Waters
Physical Description:
1 online resource (178 p.)
Language:
english
Creator:
Sindelar, Hugo R
Publisher:
University of Florida
Place of Publication:
Gainesville, Fla.
Publication Date:

Thesis/Dissertation Information

Degree:
Doctorate ( Ph.D.)
Degree Grantor:
University of Florida
Degree Disciplines:
Environmental Engineering Sciences
Committee Chair:
BROWN,MARK T
Committee Co-Chair:
BOYER,TREAVOR H
Committee Members:
BONZONGO,JEAN-CLAUDE J
CLARK,MARK W

Subjects

Subjects / Keywords:
algae -- calcium -- eutrophication -- everglades -- oxidant -- phosphorus -- precipitation -- scrubber -- ultraviolet
Environmental Engineering Sciences -- Dissertations, Academic -- UF
Genre:
Environmental Engineering Sciences thesis, Ph.D.
bibliography   ( marcgt )
theses   ( marcgt )
government publication (state, provincial, terriorial, dependent)   ( marcgt )
born-digital   ( sobekcm )
Electronic Thesis or Dissertation

Notes

Abstract:
Algae scrubbers are a developing technology used for nutrient removal from many different impaired waters, including: agricultural runoff, wastewater, and animal operation waste. Hydromentia (2005) reported a phosphorus (P) recovery rate of 37 g P/m2/yr, which is much higher than the average P uptake for other natural treatment systems, 1 g P/m2/yr.  Although algae scrubbers have shown promise for recovering P, no detailed studies have been completed to determine conditions for maximum P uptake.  Accordingly, the main objective of this research was to enhance algal scrubber P uptake.  Specific objectives are: (1) to use advanced oxidation processes (AOP) to transform organic and particulate P to more biologically labile P; (2) to investigate calcium-P co-precipitation and natural organic matter (NOM) interactions within algae scrubbers; and (3) to test different operating conditions and potential chemical amendments to maximize algal scrubber P uptake.  Results for objective 1 showed that the photodegradation of recalcitrant-P to soluble reactive P (SRP) is possible using UV fluences of at least 2.4 J/cm2 and H2O2 doses of at least 50mg H2O2/L.  The UV/H2O2 AOP was able to consistently convert recalcitrant-P to SRP in synthetic waters.  However, the complex chemistry of natural water made consistent conversion of recalcitrant-P to SRP hard to achieve.  Results for objective 2 showed that Ca-P co-precipitation occurs at pH 9.5 in the presence of high natural organic matter (NOM) (30 mg/L).  The supersaturation of calcite overcomes the inhibitory effect of NOM seen at lower pH values.  Higher P concentrations lead to higher densities of P on the calcite surface, even though Ca precipitation rates are lower as a result of the inhibitory effect of P.  Results for objective 3 showed that 12-hr operation (daylight hours) significantly increased P uptake in algae scrubbers from an average of 24 g P/m2/yr to 87 g P/m2/yr.  The high P removal rate can be attributed to the stabilization of Ca-P minerals during 12-hr operation.  Algal photosynthesis increases daytime pH values (9–9.5), driving Ca-P co-precipitation, and 12-hr operation prevents these minerals from re-dissolving during the night as the pH decreases back to neutral (7–7.5).
General Note:
In the series University of Florida Digital Collections.
General Note:
Includes vita.
Bibliography:
Includes bibliographical references.
Source of Description:
Description based on online resource; title from PDF title page.
Source of Description:
This bibliographic record is available under the Creative Commons CC0 public domain dedication. The University of Florida Libraries, as creator of this bibliographic record, has waived all rights to it worldwide under copyright law, including all related and neighboring rights, to the extent allowed by law.
Statement of Responsibility:
by Hugo R Sindelar.
Thesis:
Thesis (Ph.D.)--University of Florida, 2013.
Local:
Adviser: BROWN,MARK T.
Local:
Co-adviser: BOYER,TREAVOR H.
Electronic Access:
RESTRICTED TO UF STUDENTS, STAFF, FACULTY, AND ON-CAMPUS USE UNTIL 2014-12-31

Record Information

Source Institution:
UFRGP
Rights Management:
Applicable rights reserved.
Classification:
lcc - LD1780 2013
System ID:
UFE0046172:00001