Pre-oxidation with peracetic acid to degradation of chlorophyll-a from drinking water: A comparative study with calcium hypochlorite

Fonseca, Thais Rosa; Neves, Ana Paula Nogueira das; Castro, Douglas Azevedo; Cavallini, Grasiele Soares

doi:10.1016/j.jwpe.2020.101643

Cited by 4 publications

(3 citation statements)

References 16 publications

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“…As an emerging disinfectant, peracetic acid (PAA) has been proposed as an alternative disinfectant for replacing chlorine-based oxidants mainly for (1) reducing DBP generation and (2) the organic part of the peracid molecule benefiting the penetration of PAA onto/into cells. , For instance, Fonseca et al reported effective removal of chlorophyll-a by PAA, and Hurtado et al observed that the addition of ∼5 mg/L PAA could control mussel growth in the intakes of drinking water treatment plants . Additionally, several studies reported success in using PAA as the (pre)oxidant/disinfectant to suppress DBP generation. , …”

Section: Introductionmentioning

confidence: 99%

Reinvestigation on the Mechanism for Algae Inactivation by the Ultraviolet/Peracetic Acid Process: Role of Reactive Species and Performance in Natural Water

Cao,

Wang,

Cheng

et al. 2023

Environ. Sci. Technol.

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This study provided an in-depth understanding of enhanced algae inactivation by combining ultraviolet and peracetic acid (UV/PAA) and selecting Microcystis aeruginosa as the target algae species. The electron paramagnetic resonance (EPR) tests and scavenging experiments provided direct evidence on the formed reactive species (RSs) and indicated the dominant role of RSs including singlet oxygen (1O2) and hydroxyl (HO•) and organic (RO•) radicals in algae inactivation. Based on the algae inactivation kinetic model and the determined steady-state concentration of RSs, the contribution of RSs was quantitatively assessed with the second-order rate constants for the inactivation of algae by HO•, RO•, and 1O2 of 2.67 × 109, 3.44 × 1010, and 1.72 × 109 M–1 s–1, respectively. Afterward, the coexisting bi/carbonate, acting as a shuttle, that promotes the transformation from HO• to RO• was evidenced to account for the better performance of the UV/PAA system in algae inactivation under the natural water background. Subsequently, along with the evaluation of the UV/PAA preoxidation to modify coagulation–sedimentation, the possible application of the UV/PAA process for algae removal was advanced.

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Section: Introductionmentioning

confidence: 99%

Reinvestigation on the Mechanism for Algae Inactivation by the Ultraviolet/Peracetic Acid Process: Role of Reactive Species and Performance in Natural Water

Cao,

Wang,

Cheng

et al. 2023

Environ. Sci. Technol.

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“…12 Calcium hypochlorite [Ca(ClO) 2 ] is an oxidant that is widely used in water and wastewater treatment for its excellent characteristics in both efficiency and cost. 13,14 Recently, applying Ca(ClO) 2 in WAS treatment has drawn increasing attention of researchers around the world. 15,16 Compared with other frequently used oxidants such as H 2 O 2 , KMnO 4 , CaO 2 , and O 3 , Ca(ClO) 2 has advantages in both stability and price.…”

Section: ■ Introductionmentioning

confidence: 99%

“…Among them, the chemical oxidization method has advantages in the aspects of efficiency, investment cost, and operation and thus has become one of the research focus points in recent years . Calcium hypochlorite [Ca(ClO) 2 ] is an oxidant that is widely used in water and wastewater treatment for its excellent characteristics in both efficiency and cost. , Recently, applying Ca(ClO) 2 in WAS treatment has drawn increasing attention of researchers around the world. , Compared with other frequently used oxidants such as H 2 O 2 , KMnO 4 , CaO 2 , and O 3 , Ca(ClO) 2 has advantages in both stability and price. In the treatment process, Ca(ClO) 2 can efficiently break the EPS flocs and microbial cytoderm/cytomembrane, which then results in the release of both extracellular and intracellular organics.…”

Section: Introductionmentioning

confidence: 99%

Calcium Hypochlorite Promotes Dark Fermentative Hydrogen Production from Waste Activated Sludge

Tao

2022

ACS Sustainable Chem. Eng.

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This study reported a high-efficiency and low-cost sludge pretreatment method using calcium hypochlorite [Ca(ClO)2] for promoting anaerobic fermentation performance. The experimental results indicated that the cumulative hydrogen yield was enhanced from 1.87 to 16.72 mL/g volatile suspended solids (VSSs) when the Ca(ClO)2 dosage was increased from 0 to 1.5 g/L and then reduced to 13.80 mL/g VSSs when the Ca(ClO)2 dosage reached 1.8 g/L. The mechanism study revealed that Ca(ClO)2 efficiently disrupted sludge extracellular polymeric substances and microbial cells, producing more soluble organics for the subsequent biochemical processes. Beyond that, the biodegradability of sludge organics was promoted by Ca(ClO)2 pretreatment. Biochemical reaction kinetic analysis indicated that the activities of microbes responsible for hydrogen consumption were severely inhibited when treated with Ca(ClO)2. The two decomposition products of Ca(ClO)2, Ca(OH)2 and HClO, positively affected the hydrogen yield, with the contribution of Ca(OH)2 being greater than HClO. Microbial community analysis illustrated that the fermentative microbes were markedly enriched by Ca(ClO)2 pretreatment, with the abundances found to be 3.21 and 45.62% in control and Ca(ClO)2-pretreated fermenters, respectively. After fermentation, the Ca(ClO)2-pretreated sludge showed better dewaterability than the control, and the organic pollutants diclofenac and sulfamethazine, as well as the fecal coliforms, were largely removed by Ca(ClO)2.

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Smarter water quality monitoring in reservoirs using interpretable deep learning models and feature importance analysis

Majnooni,

Fooladi,

Nikoo

et al. 2024

Journal of Water Process Engineering

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Pre-oxidation with peracetic acid to degradation of chlorophyll-a from drinking water: A comparative study with calcium hypochlorite

Cited by 4 publications

References 16 publications

Reinvestigation on the Mechanism for Algae Inactivation by the Ultraviolet/Peracetic Acid Process: Role of Reactive Species and Performance in Natural Water

Reinvestigation on the Mechanism for Algae Inactivation by the Ultraviolet/Peracetic Acid Process: Role of Reactive Species and Performance in Natural Water

Calcium Hypochlorite Promotes Dark Fermentative Hydrogen Production from Waste Activated Sludge

Smarter water quality monitoring in reservoirs using interpretable deep learning models and feature importance analysis

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