☆ 4.7 Article

Characteristics of algogenic organic matter generated under different nutrient conditions and subsequent impact on microfiltration membrane fouling

DESALINATION (2012)

Journal

DESALINATION

Volume 293, Issue -, Pages 104-111

Publisher

ELSEVIER SCIENCE BV

DOI: 10.1016/j.desal.2012.03.001

Keywords

Microcystis aeruginosa; Algogenic organic matter; Microfiltration; N/P; Fluorescence EEMs spectroscopy

Funding

National Water Pollution Control and Treatment Key Technologies R&D Program of China [2008ZX07421-006, 2009ZX 07424-006]

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Abstract

This work investigated the characteristics of algogenic organic matter (AOM) that was produced by blue-green algae grown under different nitrogen to phosphorus ratios (1N:1P, 1N:2P, 1N:10P, 2N:1P). Subsequently, the potential for AOM microfiltration (MF) membrane fouling under these scenarios was evaluated. The results showed that algae grew differently under various N/P ratios. Microcystis aeruginosa in 1N:10P and 1N:2P grew much better than those in 1N:1P. When constant phosphorous concentrations were maintained, no obvious effect was observed on the accumulation of algal intracellular organic matter. The amount of AOM released from M. aeruginosa was also affected by the N/P. AOM fraction analysis showed that the neutral hydrophilic fraction (N-HP1) was the main component of AOM; with lower N/P ratios, the proportion of hydrophilic AOM increased. Moreover, molecular weight (MW) distribution discrepancies existed among different AOMs. ME membrane fouling by AOM may also be influenced by N/P variations. AOM at 1N:10P exerted the strongest impact on membrane fouling, followed sequentially by 1N:2P, 1N:1P and 2N:1P. According to the analysis of the excitation-emission matrices (EEMs) and the MW distribution of membrane filtration, the membrane fouling potential of AOM seemed to be mainly associated with polysaccharide-like or protein-like substances of large MW. (c) 2012 Elsevier B.V. All rights reserved.

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Variation in riverine dissolved organic matter (DOM) optical quality during snowmelt- and rainfall-driven events in a forested wetland watershed

Lucy A. Rose, Diana L. Karwan, Salli Dymond

Summary: The spring snowmelt period is crucial for the transportation and export of organic matter in peatland and wetland dominated systems. The flowpaths that carry melting snow and soil water to surface waters can change rapidly depending on various factors such as melt timing, rate, freeze-thaw cycles, and rain-on-snow events. These dynamic flowpaths influence the concentrations of dissolved organic carbon (DOC) and optical properties of dissolved organic matter (DOM) in surface waters. This study investigated the changes in DOC concentration, DOM optical properties, and hydrochemical tracers during spring snowmelt and early growing season events in a woody wetland-dominated watershed in northern Minnesota. The findings suggest a shift in DOM source and character from primarily groundwater to shallow wetland soil during the transition from dormant season to early growing season.

JOURNAL OF HYDROLOGY (2023)