Impact of UV/persulfate pretreatment on the formation of disinfection byproducts during subsequent chlorination of natural organic matter

Xie, Pengchao; Ma, Jun; Liu, Wei; Zou, Jing; Yue, Siyang

doi:10.1016/j.cej.2015.01.043

Cited by 112 publications

(20 citation statements)

References 56 publications

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“…CH and TCP, following a fluctuant reduction trend different from DCAN, might be due to the oxidation of dissolved aldehyde-precursors to other production such as carboxylic acids at high dosage of PS [46,60]. Thus, the rise of DCAN formation along with PS dosages was supposed to be firstly attributed to the increase of amino acids through the released IOM (Figs.…”

Section: Impact Of Uv/ps Preoxidation On Dbpfpmentioning

confidence: 98%

UV/persulfate preoxidation to improve coagulation efficiency of Microcystis aeruginosa

Chen

Xie

Wang

et al. 2017

Journal of Hazardous Materials

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The performance of UV-activated persulfate (UV/PS) technology as preoxidation process to enhance Microcystis aeruginosa removal by subsequent coagulation-sedimentation was firstly evaluated. The results demonstrate that UV/PS preoxidation could successfully promote coagulation of algae cells through the effective neutralization of zeta potential, which was caused by the changes of cell morphology, size distribution and surface properties after simultaneous UV irradiation and formed reactive species (i.e. SO and HO) oxidation. Since excessive oxidation would cause cell rupture along with the release of organics, which could deteriorate coagulation efficiency, optimal PS dose (60mg/L) and UV dose (375mJ/cm) were proposed to exist in this study. The concentrations of extracellular algal organic matter (AOM) sharply increased by 48.2% during the preoxidation period, while gradually decreased in the following coagulation and sedimentation. Most of the concerned disinfection by-products (DBPs) monotonically decreased or followed fluctuant reduction with increasing PS doses, whereas the trichloromethane, trichloroacetic acid and dichloroacetonitrile persistently increased, which was inferred to be related to the variation of AOM. This study suggests that UV/PS might be a potential pretreatment process to assist coagulation on the removal of algae.

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Section: Impact Of Uv/ps Preoxidation On Dbpfpmentioning

confidence: 98%

UV/persulfate preoxidation to improve coagulation efficiency of Microcystis aeruginosa

Chen

Xie

Wang

et al. 2017

Journal of Hazardous Materials

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“…•− should increase; therefore, higher doses of PS will have a larger effect on the characteristics of NOM (Xie et al 2015b) (Wang et al 2019a, b).…”

Section: Effect Of Ps Doses On Ha Degradation Via Uv/psmentioning

confidence: 99%

Study on the removal of humic acid by ultraviolet/persulfate advanced oxidation technology

Sun

Jia

et al. 2020

Environ Sci Pollut Res

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Humic acid (HA) in water is the main precursor of disinfection by-products in the chlorination process of drinking water. In this study, an ultraviolet/persulfate (UV/PS) process, in a laboratory-scale system, is successful in the degradation of HA. The results showed that HA was significantly degraded (UV 254 removal rate of~89%) and partially mineralized (6 2.5%) by UV/PS treatment at a PS dose of 0.4 mM, pH of 7.12, and UV irradiation time of 160 min. The trihalomethane formation potential (THMFP) was also significantly reduced (THMFP reduction of~85.4%). A strong linear relationship was observed between UV 254 and dissolved organic carbon. The removal rate of HA at low pH was better than that at high pH conditions, and the inhibition by Cl − slowed down after an initial increase, and the inhibition was weaker than HCO 3 − . By analyzing the fluorescence spectrum of two humic-like substances, the fluorescent compounds C1 and C2 in HA were significantly degraded, and the change in C1 and C2 concentration was correlated with the decrease of THMFP. The degradation of different fractions of natural organic matter in real-world water samples indicated that UV/PS has significant potential to decrease HA in water.

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“…Nevertheless, usage of other disinfectants has also been observed to form DBPs and present regulations attempt to stabilize the hazards between microbial pathogens and DBPs. DBPs comprise the following (Weiner, 2012):  Halogenated organic compounds, such as THMs, haloacetic acids, haloketones, and other halogenated compounds that are produced firstly while chlorine or ozone (in the presence of bromide ion) are utilized as disinfectant (Bougeard et al, 2008;Xie et al, 2015;Ye et al, 2012;Kanokkantapong et al, 2006;Navalon et al, 2009;Aydin et al, 2012;Rincón et al, 2001).  Organic oxidation by-products, such as aldehydes, ketones, assimilable organic carbon, and biodegradable organic carbon.…”

Section: Disinfectionmentioning

confidence: 99%

Disinfection and DBPs removal in drinking water treatment: A perspective for a green technology

Ghernaout

2018

Int. j. adv. appl. sci.

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The generation, monitoring, and health impacts of disinfection by-products (DBPs) in potable water are problems of worldwide worry. Several nations, besides the World Health Organization, possess regulations and/or guidelines on bearable levels of DBPs in water. Since drinking water is frequently remediated using a chemical killing agent, DBPs are pollutants to which several humans are unprotected. On account of the health impacts linked to subjection to chlorinated water and/or some DBPs, the water manufacturing has performed great endeavors to equilibrate killing pathogens and DBP monitoring. Large survey has been realized on rising DBPs of health and regulatory worry. In spite of the fact that the attention on DBPs was previously on chlorine-and bromine-containing carbonaceous DBPs, appearing DBPs comprise iodine-containing species, also halogenated and non-halogenated nitrogenous DBPs. In addition, latest toxicity experimentation has proposed that certain of the more recent PBPs are of more elevated toxicity than some of the regulated chemical products. Therefore, survey has been realized to better comprehend how to costeffectively monitor a large interval of regulated and appearing DBPs. This comprises the usage of advanced remediation and killing pathogens methodologies. This paper shows certain of the newest research works at comprehending these significant DBP-related problems. Disinfection is killing microorganisms present in water; but, it is as well killing human beings drinking water by poisonous DBPs. Using chemicals for water treatment is finally a lost cause.

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Impact of UV/persulfate pretreatment on the formation of disinfection byproducts during subsequent chlorination of natural organic matter

Cited by 112 publications

References 56 publications

UV/persulfate preoxidation to improve coagulation efficiency of Microcystis aeruginosa

UV/persulfate preoxidation to improve coagulation efficiency of Microcystis aeruginosa

Study on the removal of humic acid by ultraviolet/persulfate advanced oxidation technology

Disinfection and DBPs removal in drinking water treatment: A perspective for a green technology

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