Evaluation of potassium ferrate as an alternative disinfectant on cyanobacteria inactivation and associated toxin fate in various waters

摘要

AbstractPotassium ferrate (K2FeO4) is an effective oxidant that may be used as a pre- or post-oxidant in the purification of source water with cyanobacterial issues. To provide a better basis for the application of this oxidant during water treatment processes, the impacts of K2FeO4on the cell viability ofMicrocystis aeruginosaand the fate of associated microcystins (MCs) were investigated in various water matrices. The results showed that a water matrix can significantly affect the effectiveness of K2FeO4on cyanobacteria inactivation. 10 mg L−1K2FeO4induced significant cell lysis ofM. aeruginosain Ran Yi Tan Reservoir (RYTR) water while the membrane integrity was relatively unaffected in ASM-1 media and Cheng Kung Lake (CKL) water. The reduced efficiency of K2FeO4oxidation may be attributed to the manganese (Mn2+) and organic matter (Ethylenediaminetetraacetic acid, EDTA) in the ASM-1 media and high concentrations of natural organic matters (NOMs) in the CKL water. A delayed Chick-Watson model was applied to simulate the experimental data for cyanobacterial cell rupture, and the cell lysis rates of theM. aeruginosasamples were determined to be 128-242 M−1 s−1(mol L−1 s−1). Generally, no significant increases in extracellular MCs were observed in the three different waters, even in the RYTR water where the membrane integrity of the cyanobacterial cells was severely disrupted. Therefore, K2FeO4could be a potential pre-oxidant to enhance subsequent treatments for cyanobacteria removal without affecting the cell integrity, or could serve as a post-oxidant to inactivate cyanobacterial cells and degrade MCs effectively, depending on the specific water matrix.Graphical abstractDisplay OmittedHighlights•K2FeO4could oxidize microcystins in the presence of cyanobacterial cells.•Manganese and organic matters could significantly reduce the efficiency of K2FeO4.•A lag phase was observed before cell rupture occurred after K2FeO4addition.•The Delayed Chick Watson Model well describes the kinetics of cell rupture.