Effects of natural organic matter on calcium and phosphorus co-precipitation

Hugo R. Sindelar, Mark T. Brown, Treavor Boyer

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

Phosphorus (P), calcium (Ca) and natural organic matter (NOM) naturally occur in all aquatic ecosystems. However, excessive P loads can cause eutrophic or hyper-eutrophic conditions in these waters. As a result, P regulation is important for these impaired aquatic systems, and Ca-P co-precipitation is a vital mechanism of natural P removal in many alkaline systems, such as the Florida Everglades. The interaction of P, Ca, and NOM is also an important factor in lime softening and corrosion control, both critical processes of drinking water treatment. Determining the role of NOM in Ca-P co-precipitation is important for identifying mechanisms that may limit P removal in both natural and engineered systems. The main goal of this research is to assess the role of NOM in inhibiting Ca and P co-precipitation by: (1) measuring how Ca, NOM, and P concentrations affect NOM's potential inhibition of co-precipitation; (2) determining the effect of pH; and (3) evaluating the precipitated solids. Results showed that Ca-P co-precipitation occurs at pH 9.5 in the presence of high natural organic matter (NOM) (≈30mgL-1). The supersaturation of calcite overcomes the inhibitory effect of NOM seen at lower pH values. Higher initial P concentrations lead to both higher P precipitation rates and densities of P on the calcite surface. The maximum surface density of co-precipitated P on the precipitated calcite surface increases with increasing NOM levels, suggesting that NOM does prevent the co-precipitation of Ca and P.

Original languageEnglish (US)
Pages (from-to)218-224
Number of pages7
JournalChemosphere
Volume138
DOIs
StatePublished - Nov 1 2015
Externally publishedYes

Fingerprint

Coprecipitation
Biological materials
Phosphorus
Calcium
calcium
phosphorus
organic matter
Calcium Carbonate
Calcite
calcite
corrosion control
Corrosion
effect
Water Purification
Aquatic ecosystems
Supersaturation
Drinking Water
supersaturation
softening
Ecosystem

Keywords

  • Calcium
  • Co-precipitation
  • Natural organic matter
  • Phosphorus

ASJC Scopus subject areas

  • Environmental Chemistry
  • Chemistry(all)
  • Medicine(all)

Cite this

Effects of natural organic matter on calcium and phosphorus co-precipitation. / Sindelar, Hugo R.; Brown, Mark T.; Boyer, Treavor.

In: Chemosphere, Vol. 138, 01.11.2015, p. 218-224.

Research output: Contribution to journalArticle

Sindelar, Hugo R. ; Brown, Mark T. ; Boyer, Treavor. / Effects of natural organic matter on calcium and phosphorus co-precipitation. In: Chemosphere. 2015 ; Vol. 138. pp. 218-224.
@article{36541340d1d74f0ab26a0588d4824fca,
title = "Effects of natural organic matter on calcium and phosphorus co-precipitation",
abstract = "Phosphorus (P), calcium (Ca) and natural organic matter (NOM) naturally occur in all aquatic ecosystems. However, excessive P loads can cause eutrophic or hyper-eutrophic conditions in these waters. As a result, P regulation is important for these impaired aquatic systems, and Ca-P co-precipitation is a vital mechanism of natural P removal in many alkaline systems, such as the Florida Everglades. The interaction of P, Ca, and NOM is also an important factor in lime softening and corrosion control, both critical processes of drinking water treatment. Determining the role of NOM in Ca-P co-precipitation is important for identifying mechanisms that may limit P removal in both natural and engineered systems. The main goal of this research is to assess the role of NOM in inhibiting Ca and P co-precipitation by: (1) measuring how Ca, NOM, and P concentrations affect NOM's potential inhibition of co-precipitation; (2) determining the effect of pH; and (3) evaluating the precipitated solids. Results showed that Ca-P co-precipitation occurs at pH 9.5 in the presence of high natural organic matter (NOM) (≈30mgL-1). The supersaturation of calcite overcomes the inhibitory effect of NOM seen at lower pH values. Higher initial P concentrations lead to both higher P precipitation rates and densities of P on the calcite surface. The maximum surface density of co-precipitated P on the precipitated calcite surface increases with increasing NOM levels, suggesting that NOM does prevent the co-precipitation of Ca and P.",
keywords = "Calcium, Co-precipitation, Natural organic matter, Phosphorus",
author = "Sindelar, {Hugo R.} and Brown, {Mark T.} and Treavor Boyer",
year = "2015",
month = "11",
day = "1",
doi = "10.1016/j.chemosphere.2015.05.008",
language = "English (US)",
volume = "138",
pages = "218--224",
journal = "Chemosphere",
issn = "0045-6535",
publisher = "Elsevier Limited",

}

TY - JOUR

T1 - Effects of natural organic matter on calcium and phosphorus co-precipitation

AU - Sindelar, Hugo R.

AU - Brown, Mark T.

AU - Boyer, Treavor

PY - 2015/11/1

Y1 - 2015/11/1

N2 - Phosphorus (P), calcium (Ca) and natural organic matter (NOM) naturally occur in all aquatic ecosystems. However, excessive P loads can cause eutrophic or hyper-eutrophic conditions in these waters. As a result, P regulation is important for these impaired aquatic systems, and Ca-P co-precipitation is a vital mechanism of natural P removal in many alkaline systems, such as the Florida Everglades. The interaction of P, Ca, and NOM is also an important factor in lime softening and corrosion control, both critical processes of drinking water treatment. Determining the role of NOM in Ca-P co-precipitation is important for identifying mechanisms that may limit P removal in both natural and engineered systems. The main goal of this research is to assess the role of NOM in inhibiting Ca and P co-precipitation by: (1) measuring how Ca, NOM, and P concentrations affect NOM's potential inhibition of co-precipitation; (2) determining the effect of pH; and (3) evaluating the precipitated solids. Results showed that Ca-P co-precipitation occurs at pH 9.5 in the presence of high natural organic matter (NOM) (≈30mgL-1). The supersaturation of calcite overcomes the inhibitory effect of NOM seen at lower pH values. Higher initial P concentrations lead to both higher P precipitation rates and densities of P on the calcite surface. The maximum surface density of co-precipitated P on the precipitated calcite surface increases with increasing NOM levels, suggesting that NOM does prevent the co-precipitation of Ca and P.

AB - Phosphorus (P), calcium (Ca) and natural organic matter (NOM) naturally occur in all aquatic ecosystems. However, excessive P loads can cause eutrophic or hyper-eutrophic conditions in these waters. As a result, P regulation is important for these impaired aquatic systems, and Ca-P co-precipitation is a vital mechanism of natural P removal in many alkaline systems, such as the Florida Everglades. The interaction of P, Ca, and NOM is also an important factor in lime softening and corrosion control, both critical processes of drinking water treatment. Determining the role of NOM in Ca-P co-precipitation is important for identifying mechanisms that may limit P removal in both natural and engineered systems. The main goal of this research is to assess the role of NOM in inhibiting Ca and P co-precipitation by: (1) measuring how Ca, NOM, and P concentrations affect NOM's potential inhibition of co-precipitation; (2) determining the effect of pH; and (3) evaluating the precipitated solids. Results showed that Ca-P co-precipitation occurs at pH 9.5 in the presence of high natural organic matter (NOM) (≈30mgL-1). The supersaturation of calcite overcomes the inhibitory effect of NOM seen at lower pH values. Higher initial P concentrations lead to both higher P precipitation rates and densities of P on the calcite surface. The maximum surface density of co-precipitated P on the precipitated calcite surface increases with increasing NOM levels, suggesting that NOM does prevent the co-precipitation of Ca and P.

KW - Calcium

KW - Co-precipitation

KW - Natural organic matter

KW - Phosphorus

UR - http://www.scopus.com/inward/record.url?scp=84940906382&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84940906382&partnerID=8YFLogxK

U2 - 10.1016/j.chemosphere.2015.05.008

DO - 10.1016/j.chemosphere.2015.05.008

M3 - Article

C2 - 26079982

AN - SCOPUS:84940906382

VL - 138

SP - 218

EP - 224

JO - Chemosphere

JF - Chemosphere

SN - 0045-6535

ER -