Ultrasound-enhanced coagulation for Microcystis aeruginosa removal and disinfection by-product control during subsequent chlorination

Huang, Yangrui; Ding, Shunke; Li, Lei; Liao, Qingying; Chu, Wenhai; Li, Huaizheng

doi:10.1016/j.watres.2021.117334

“…Thus, the produced ROS attacked the algal cell membrane, damaging the internal cell tissues and ultimately destroying M. aeruginosa. , In addition, the EOM released from algal cells could also be rapidly degraded by ROS, thus ensuring the effective removal of algal cells by sponge@SBC 1 -300/PDS. , …”

Section: Resultsmentioning

confidence: 89%

“…Thus, the produced ROS attacked the algal cell membrane, damaging the internal cell tissues and ultimately destroying M. aeruginosa. , In addition, the EOM released from algal cells could also be rapidly degraded by ROS, thus ensuring the effective removal of algal cells by sponge@SBC 1 -300/PDS. , normalS 2 normalO 8 2 − + 2 normalH 2 normalO → HO 2 − + 2 SO 4 2 − + 3 normalH + normalS 2 normalO 8 2 − + HO 2 − → SO 4 • − + SO 4 2 − + normalO 2 • − + normalH + SO 4 • − + OH − → O • H + SO 4 2 − 2 normalS...…”

Section: Resultsmentioning

confidence: 99%

Floatable 3D Sponge@SBC-Induced Dual-Pathway-Activated Persulfate for Microcystis aeruginosa Inactivation

Deng

¹

,

Chen

²

,

Yu

³

et al. 2023

ACS EST Water

6

0

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Harmful algal blooms have become a global environmental problem. Persulfate-based advanced oxidation processes (PS-AOPs) are a good method for controlling the algal bloom emergency. However, the practical application of PS-AOPs is hindered by the low efficiency and difficult recovery of the powdered catalysts in actual water. To address this challenge, a novel floatable 3D sponge@SBC composite (sponge@SBC 1 -300) was synthesized using biochar through a simple coating process. The sponge@SBC 1 -300 showed excellent mechanical stability and catalytic performance in PS-AOPs, achieving 97.7% removal of Microcystis aeruginosa in 250 mins. Good stability and repeatability with a 90.1% removal efficiency after four reuse times were observed. In addition, in the actual river and lake water samples, M. aeruginosa can be effectively inactivated (87.9%). Dual mechanisms, including free-radical (SO 4•− , • OH, and • O 2 − ) and nonradical ( 1 O 2 and electron transfer) pathways, were found to participate in M. aeruginosa inactivation. Based on the observations of changing cellular morphologies, membrane permeability, and antioxidant system of M. aeruginosa, it was suggested that the generated reactive oxygen species could inactivate algae cells by attacking cell membranes and damaging their antioxidant systems.

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“…To overcome this limitation, numerous strategies have been proposed to enhance the effectiveness of chlorination for water remediation. These strategies involve the use of additional oxidants (e.g., H 2 O 2 , 5 persulfate 6 and ozone 7 ), as well as the implementation of various energy inputs (e.g., UV 8,9 and solar, 10 ultrasound, 11 and electrochemical process 12,13 ), and the use of catalysts. 14,15 These strategies facilitate the generation of reactive radicals, thereby augmenting the overall efficiency of chlorination.…”

Section: Introductionmentioning

confidence: 99%

“…Considering that higher concentrations of chlorine favor chlorination efficiency, the freezing process has the potential to enhance chlorination efficiency by enriching the concentrations of free chlorine species. While numerous methods have been employed in conjunction with chlorination to enhance the degradation of organic pollutants, [6][7][8][11][12][13][14][15] the potential of the freezing process to activate free chlorine species remains largely unexplored. Further investigation into this area could provide valuable insights into the utilization of freezing as a means to enhance chlorination efficiency and improve the degradation of organic pollutants in water treatment processes.…”

Section: Introductionmentioning

confidence: 99%