Trace organic contaminants abatement by permanganate/bisulfite pretreatment coupled with conventional water treatment processes: Lab- and pilot-scale tests

Chen, Jie; Ling, Jinfeng; Sun, Bo; Jian, Wang; Zhou, Baoxue; Guan, Xiaohong; Sun, Yuankui

doi:10.1016/j.jhazmat.2020.123380

Cited by 20 publications

(10 citation statements)

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“…In the pilot‐scale experiment, the removal of sulfamethoxazole by PM/BS was chosen as a pattern reaction to measure the mixing performance of in‐line static mixers due to its exhaustive removal of contaminants and rapid reaction rate (Chen et al, 2021). Three‐dimensional printing products of W‐HS mixer (Figure S7a,b), S‐CX mixer (Figure S7c,d), and Tai‐Chi mixer (Figure S7e,f) were tested in that they have been analyzed as the most competent ones.…”

Section: Resultsmentioning

confidence: 99%

“…Only when PM and BS contact can they motivate powerful reactions, while CoV in CFD simulation ignores such factor and is still able to obtain a satisfactory value even when chemicals separately achieve uniformity without contact. In some WTPs and WWTPs, PM/BS process is usually achieved by static mixer to mix BS solution with the mixture of untreated water and PM solution (the distance between PM and BS injection nozzles is normally long enough to realize the completely uniform mixture) (Chen et al, 2021), in which case W‐HS mixer usually performs better.…”

Section: Resultsmentioning

confidence: 99%

“…•À ), and HO • ) (Chen et al, 2020;Chen et al, 2021;Sun et al, 2016;Sun, Bao, et al, 2018;Sun, Li, et al, 2018;Zhu et al, 2019;Zhu et al, 2020). This oxidation technology (denoted as PM/BS process) is able to eliminate a wide range of EOCs at extraordinarily rapid rates that were 5 to 6 orders of magnitude faster than those using permanganate alone and $5 to 7 orders of magnitude faster than other conventional advanced oxidation processes (UV, UV/H 2 O 2 , photo-Fenton, etc.)…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, an extra treatment unit (normally a tank) for reaction is indispensable when these oxidation technologies are applied, which may limit their application, especially when restricted space is available. To overcome these disadvantages, our group invented a novel oxidation technology, where S (IV), a mixture of bisulfite (HSO 3 − , BS), and sulfite (SO 3 2− ) were employed to activate PM to generate various reactive oxidizing species (ROS, including Mn(V), Mn (VI), sulfate radical (SO 4 •− ), and HO • ) (Chen et al, 2020; Chen et al, 2021; Sun et al, 2016; Sun, Bao, et al, 2018; Sun, Li, et al, 2018; Zhu et al, 2019; Zhu et al, 2020). This oxidation technology (denoted as PM/BS process) is able to eliminate a wide range of EOCs at extraordinarily rapid rates that were 5 to 6 orders of magnitude faster than those using permanganate alone and ∼5 to 7 orders of magnitude faster than other conventional advanced oxidation processes (UV, UV/H 2 O 2 , photo‐Fenton, etc.)…”

Section: Introductionmentioning

confidence: 99%

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A novel design of in‐line static mixer for permanganate/bisulfite process: Numerical simulations and pilot‐scale testing

Han

Guan

Sun

et al. 2022

Water Environment Research

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An increasing number of chemical technologies to wipe out contaminants within an incredibly short period of time have been developed recently, while their application was always hindered by the inefficient or improper mixing of reactants. To address this issue, the present work proposed a new static mixer named Tai-Chi which consists of blade, fin, and spoiler elements. Tai-Chi mixer can slice and divert the solutions inside and generate high shear flow to promote mixing process. Numerical simulations helped to determine the optimal operating conditions for Tai-Chi mixer, including laying its components anterior to the injection nozzles and keeping the velocity rate ratio of main pipe to branch pipe within the range of 0.5 to 1. Numerical simulations further proved that Tai-Chi mixer could strike a great balance between mixing performance (coefficient of variation [CoV] reaches 0.1 within 5 to 7 pipe diameters downstream) and head loss (nearly a half of other high shear static mixer in the market). Data of pilot-scale testing by Tai-Chi mixer confirm that 80% sulfamethoxazole could be eliminated in permanganate/bisulfite process within 8 pipe diameters, as well as showed the superiority of Tai-Chi's mixing performance in early stage compared with other static mixers in the market. Practitioner Points• A Tai-Chi static mixer with blade, fin, and spoiler elements is devised.• The optimal condition of flow rate and installment of Tai-Chi mixer is determined.• Ultra-fast mixing is achieved by Tai-Chi (CoV < 0.1 within 5-7 pipe diameters).• Pilot-scale test verifies the mixing efficiency of Tai-Chi mixer.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A novel design of in‐line static mixer for permanganate/bisulfite process: Numerical simulations and pilot‐scale testing

Han

Guan

Sun

et al. 2022

Water Environment Research

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“…However, compared with ozone, Fenton, and other advanced oxidation processes, the reaction rates of some TrOCs with Mn(VII) are relatively low. , Therefore, studies on the strategies for enhancing Mn(VII) oxidation toward TrOCs were reported, such as the combinations of Mn(VII) with bisulfite, − peroxymonosulfate, , ozone, ultrasound, , ultraviolet irradiation, humic acid, and redox mediators. Particularly, redox mediators, such as quinone, hydroquinone, 2,2′-azino-bis(3-ethylbenzothiazoline)-6-sulfonate (ABTS), and 1-hydroxybenzotriazole (HBT), are becoming attractive due to the fact that they contain phenolic, quinone, or amine moieties identified in the ubiquitous natural dissolved organic matters (DOM).…”

Section: Introductionmentioning

confidence: 99%

Role of TEMPO in Enhancing Permanganate Oxidation toward Organic Contaminants

Zhang

Shi

Bai

et al. 2021

Environ. Sci. Technol.

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Permanganate (Mn(VII)) has been widely applied as an oxidant in water treatment plants. However, compared with ozone, Fenton, and other advanced oxidation processes, the reaction rates of some trace organic contaminants (TrOCs) with Mn(VII) are relatively low. Therefore, further studies on the strategies for enhancing the oxidation of organic contaminants by Mn(VII) are valuable. In this work, 2,2,6,6-tetramethylpiperidine-N-oxyl (TEMPO), as an electron shuttle, enhanced Mn(VII) oxidation toward various TrOCs (i.e., bisphenol A (BPA), phenol, estrone, sulfisoxazole, etc.). TEMPO sped up the oxidative kinetics of BPA by Mn(VII) greatly, and this enhancement was observed at a wide pH range of 4.0−11.0. The exact mechanism of TEMPO in Mn(VII) oxidation was described briefly as follows: (i) TEMPO was oxidized by Mn(VII) to its oxoammonium cation (TEMPO + ) by electron transfer, which was the reactive species responsible for the accelerated degradation of TrOCs and (ii) TEMPO + could decompose TrOCs rapidly with itself back to TEMPO or TEMPOH (TEMPO hydroxylamine). To further illustrate the interaction between TEMPO and target TrOCs, we explored the transformation pathways of BPA in Mn(VII)/ TEMPO oxidation. Compared to Mn(VII) alone, adding TEMPO into the Mn(VII) solution significantly suppressed BPA's selfcoupling and promoted hydroxylation, ring-opening, and decarboxylation. Moreover, the Mn(VII)/TEMPO system was promising for the abatement of TrOCs in real waters for humic acid, and ubiquitous cations/anions had no adverse or even beneficial impact on the Mn(VII)/TEMPO system.

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Fate and transformation of iodine species during Mn(VII)/sulfite treatment in iodide‐containing water

Shao

Zhu

Chen

et al. 2022

Water Environment Research

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During oxidative treatment of iodide (I À )-containing waters, I À is easy to be oxidized into hypoiodous acid (HOI) by various oxidants and the further reaction of HOI with organic compounds can lead to the formation of iodinated disinfection by-products (I-DBPs). Oxidation of HOI to iodate (IO 3 À ) or reduction of HOI to I À has been proposed to reduce the formation of I-DBPs.Because the reaction of HOI with sulfite proceeds rapidly, this study examined the fate of iodine and the formation of I-DBPs in Mn(VII)/sulfite process.Results showed that I À was oxidized to HOI but the further formation of IO 3 À was suppressed due to the fast reduction of HOI to I À by sulfite. The reactions of HOI with SO 3 2À and IO À with SO 3 2À are the major pathways with speciesspecific second-order rate constants determined to be 1.12 Â 10 5 M À1 s À1 and 9.43 Â 10 7 M À1 s À1 , respectively. The rapid reaction of HOI with sulfite plays an essential role in minimizing the formation of iodinated products in HOIand phenol-containing solutions. The toxic risk analysis showed that the toxicity of the generated DBPs from Mn(VII)/sulfite pre-oxidation followed by chlorination only changed slightly. Practitioner Points• The decay of I À was negligible in Mn(VII)/sulfite process.• The rapid reaction of HOI with SO 3 2À resulted in the negligible generation of IO 3 À .• Mn(VII)/sulfite process exerted slight influence on the formation of I-DBPs.• Mn(VII)/sulfite process is promising for the pretreatment of I À -containing water.

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Trace organic contaminants abatement by permanganate/bisulfite pretreatment coupled with conventional water treatment processes: Lab- and pilot-scale tests

Cited by 20 publications

References 58 publications

A novel design of in‐line static mixer for permanganate/bisulfite process: Numerical simulations and pilot‐scale testing

A novel design of in‐line static mixer for permanganate/bisulfite process: Numerical simulations and pilot‐scale testing

Role of TEMPO in Enhancing Permanganate Oxidation toward Organic Contaminants

Fate and transformation of iodine species during Mn(VII)/sulfite treatment in iodide‐containing water

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