•OH Inactivation of Cyanobacterial Blooms and Degradation of Toxins in Drinking Water Treatment System

Bai, Mindong; Zheng, Qunhao; Zheng, Wei; Li, Haiyan; Lin, Shaoyun; Huang, Lingfeng; Zhang, Zhitao

doi:10.1016/j.watres.2019.02.002

Cited by 25 publications

(11 citation statements)

References 45 publications

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“…Furthermore, Xie et al, 2021, [76] reported that UV light highly degrades MC-when the experimental medium is based on ultra-pure water. Regardless, Bai et al [77] supported that 1 mg/L of OH inactivated MC-LR completely within 20 sec in a drinking water treatment process. They hypothesized pathways involved in MC-LR inactivation consisted of breaking the C=C conjugated diene bond and breaking the persistent benzene ring to carboxylic acid m/z 158.0.…”

Section: Ozonation/oxidationmentioning

confidence: 99%

“…This would alter genomic function and fidelity and hinder protein formation, leading to cell death without destroying the cell membrane. Therefore, Onstad et al [74] and Lin et al [77] recommend using a sand filtration process after ozonation, or an OH cell inactivation process to retain dead cells and complete the biodegradation of MCs.…”

Section: Ozonation/oxidationmentioning

confidence: 99%

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Multi-Soil-Layering Technology: A New Approach to Remove Microcystis aeruginosa and Microcystins from Water

Mugani

Prisca

Hejjaj

et al. 2022

Water

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Eutrophication of surface waters caused by toxic cyanobacteria such as Microcystis aeruginosa leads to the release of secondary metabolites called Microcystins (MCs), which are heptapeptides with adverse effects on soil microbiota, plants, animals, and human health. Therefore, to avoid succumbing to the negative effects of these cyanotoxins, various remediation approaches have been considered. These techniques involve expensive physico-chemical processes because of the specialized equipment and facilities required. Thus, implementing eco-technologies capable of handling this problem has become necessary. Indeed, multi-soil-layering (MSL) technology can essentially meet this requirement. This system requires little space, needs simple maintenance, and has energy-free operation and high durability (20 years). The performance of the system is such that it can remove 1.16 to 4.47 log10 units of fecal contamination from the water, 98% of suspended solids (SS), 92% of biological oxygen demand (BOD), 98% of chemical oxygen demand (COD), 92% of total nitrogen (TN), and 100% of total phosphorus (TP). The only reported use of the system to remove cyanotoxins has shown a 99% removal rate of MC-LR. However, the mechanisms involved in removing this toxin from the water are not fully understood. This paper proposes reviewing the principal methods employed in conventional water treatment and other technologies to eliminate MCs from the water. We also describe the principles of operation of MSL systems and compare the performance of this technology with others, highlighting some advantages of this technology in removing MCs. Overall, the combination of multiple processes (physico-chemical and biological) makes MSL technology a good choice of cyanobacterial contamination treatment system that is applicable in real-life conditions, especially in rural areas.

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Section: Ozonation/oxidationmentioning

confidence: 99%

Section: Ozonation/oxidationmentioning

confidence: 99%

Multi-Soil-Layering Technology: A New Approach to Remove Microcystis aeruginosa and Microcystins from Water

Mugani

Prisca

Hejjaj

et al. 2022

Water

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“…Particularly, chlorination, the most common drinking water disinfection, may produce hazardous by-products such as trihalomethane (THMs) [65], [67], [68]. To improve the performance of drinking water treatment during the water bloom outbreak, a novel plasma gas injection that combines the micro-gap DBD reactor with the water jet cavitation device has been used [17], [69]- [71]. This innovative drinking water treatment system, as illustrated in Fig.…”

Section: Drinking Water Treatmentmentioning

confidence: 99%

“…1) by combining a micro-gap DBD reactor with a water jet cavitation device and the system successfully got a high production rate of •OH radicals (1373.4 mM/min). This innovative plasma gas injection system has been used in the treatment of aquatic contaminants, particularly in the inactivation of microorganisms [16], [17]. The process of plasma chemistry reactions for •OH radical production is illustrated in Fig.…”

Section: Introductionmentioning

confidence: 99%

The Applications of Plasma Gas Injection for Pollutants Treatment

Qiu

Yang²,

2022

IEEE Trans. Plasma Sci.

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Plasma gas injection as one of the non-thermal plasma (NTP) technologies has a free-standing gas-phase plasma reactor outside the polluted target and can efficiently degrade contaminants by injecting plasma gas containing a large number of reactive species. This approach has been utilized in various fields of pollutants treatment, because of its structural advantage of indirect contact between pollutants and electrodes and its ability to produce strong oxidizing species. This article first expounds on the principle of the plasma gas injection and then progresses to a discussion of its application for pollutants degradation, mainly focusing on the treatment effect and degradation mechanisms. It is believed that plasma gas injection is considered to be a very practical, clean, efficient, and environmentally friendly method for pollution control.

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“…The sudden excessive growth of seasonal algae in lakes and reservoirs excessively burdens drinking water treatment plants (DWTPs) and worsens the water quality (Lin et al 2018). However, conventional water treatment technologies, including coagulation, flocculation and filtration, are inefficient for removing cyanobacterial blooms and some dissolved organic matter (Bai et al 2019), and even excessive algae will clog filtration tanks during the operation of waterworks (He et al 2021). During the growth and death of algae, undesirable organic matter is released into the water, such as algae organic matter (AOM) (Dong et al 2021).…”

Section: Introductionmentioning

confidence: 99%

Pilot study on the treatment of lake water with algae by ultrafiltration–ozone–biologically activated carbon

Yan

Gui

et al. 2021

Journal of Water Supply: Research and Technology-Aqua

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For the treatment of lake water with algae, the coagulation–ultrafiltration–ozone–biologically activated carbon (CUF–O3–BAC) integrated process was first used to treat East Taihu Lake water in China, aiming at evaluating the removal efficiencies of algae, permanganate index (CODMn), UV254, NH3-N and disinfection by-products (DBPs) precursors. In addition, the long-term performance of the membrane operation under the fluxes of 60, 70, 80 and 90 L/(m2·h) was also investigated, and kinetic models were established. The experimental results showed that the integrated process had positive impaction of algae, CODMn, UV254 and NH3-N removal, and the removal rates were 95.89 ± 1.52, 76.18 ± 4.38, 72.06 ± 4.72 and 81.31 ± 6.71%, respectively. The CUF process was prone to increase the formation potentials of DBPs. Although ozone could reduce the formation risks of chlorinated trihalomethanes (THMs) to a certain extent, it is ineffective to reduce those of brominated THMs and haloacetic acids (HAA5). However, the CUF–O3–BAC process was an effective technology for the removal of THMs and HAA5 precursors in drinking water treatment. Finally, it was found that the relationship between transmembrane pressure and time conformed to the first-order and second-order kinetic models, and the linear fitting coefficients were all above 90%.

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•OH Inactivation of Cyanobacterial Blooms and Degradation of Toxins in Drinking Water Treatment System

Cited by 25 publications

References 45 publications

Multi-Soil-Layering Technology: A New Approach to Remove Microcystis aeruginosa and Microcystins from Water

Multi-Soil-Layering Technology: A New Approach to Remove Microcystis aeruginosa and Microcystins from Water

The Applications of Plasma Gas Injection for Pollutants Treatment

Pilot study on the treatment of lake water with algae by ultrafiltration–ozone–biologically activated carbon

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