Removal of Intermediate Aromatic Halogenated DBPs by Activated Carbon Adsorption: A New Approach to Controlling Halogenated DBPs in Chlorinated Drinking Water

Jiang, Jingyi; Zhang, Xiangru; Zhu, Xiaohu; Li, Yu

doi:10.1021/acs.est.6b06161

Cited by 251 publications

(98 citation statements)

References 59 publications

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“…Chlorination is widely used in drinking water and wastewater (tertiary) treatment (Jiang et al, 2017;Li et al, 2017aLi et al, , 2017b. If GO is not fully removed during earlier stages of (waste)water treatment, it will reach the chlorine disinfection step where it will be exposed to both disinfection and, perhaps, sunlight irradiation (Gottschalk et al, 2009;Wang et al, 2012b).…”

Section: Introductionmentioning

confidence: 99%

Photochlorination-induced transformation of graphene oxide: Mechanism and environmental fate

Adeleye

Keller

et al. 2017

Water Research

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a b s t r a c tWith the increasing production and wide utilization of graphene oxide (GO), the nanomaterials are expected to be released into the environment, and end up in surface waters, and/or wastewater treatment plants. This study explored the changes in the physicochemical properties of GO resulting from photochlorinationd simulating the reactions that occur during water and wastewater treatment. Photochlorination resulted in significant changes in the surface oxygen-functionalities of the nanomaterials, and fragmenting of the graphenic carbon sheets was observed. We found that photochlorination can enhance the decomposition of GO through the formation of reduced GO. The changes in surface oxygenfunctionalities of GO were attributed to the oxidation by chlorine of the nanomaterials' quinone groups, and further oxidation by and/or radicals. The surface charge of GO, measured by its zeta potential, increased in magnitude with chlorination but decreased in magnitude with photochlorination, leading to the decrease in the colloidal stability of the photochlorinated nanomaterials. The antibacterial effect of the nanomaterials increased with both chlorination and photochlorination. This study clearly shows how the physicochemical properties, and environmental fate and effect of GO are modified by photochlorination.

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Section: Introductionmentioning

confidence: 99%

Photochlorination-induced transformation of graphene oxide: Mechanism and environmental fate

Adeleye

Keller

et al. 2017

Water Research

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“…chloramines, chlorine dioxide and ozone) should also be investigated for chemical cleaning of MBRs. Alternately, activated carbon might be considered as a polishing step for effective removal of halogenated byproducts in the product water in order to minimize the risks to public health …”

Section: Environmental Impacts Of Toxmentioning

confidence: 99%

Potential toxicity and implication of halogenated byproducts generated in MBR online‐cleaning with hypochlorite

Zhang

Liu

2019

J of Chemical Tech & Biotech

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Online chemical cleaning of membrane bioreactor (MBR) with sodium hypochlorite (NaClO) has been extensively applied for membrane fouling mitigation. However, it was recently revealed that residual NaClO from the online cleaning of MBR caused serious microbial lysis with the subsequent formation of dissolved organic matter (DOM), in which a substantial level of halogenated byproducts was detected. Different from those generated in potable water chlorination, most of the halogenated byproducts generated during MBR online cleaning with hypochlorite belonged to the haloaromatic family, which were apparently more toxic than aliphatic compounds. It was shown that a substantial amount of the generated halogenated byproducts passed through the microfiltration membrane and entered the surface waters through the discharge of MBR permeate. As such, the concentration of halogenated byproducts might likely reach an alarming level via bioaccumulation in the aquatic environment. This emerging situation indeed poses serious concerns for the aquatic environment, water supply and public health due to significantly high toxicity of haloaromatic compounds produced. Unfortunately, the potential halogenated byproducts-associated environmental risks have not been carefully and systematically assessed towards the establishment of relevant regulations. Therefore, this review attempted to fill up such a gap by providing the insights into the potential environmental impacts of halogenated byproducts in the MBR permeate.A substantial amount of DOM and halogenated byproducts produced in the online MBR cleaning with NaClO could enter into surface waters (e.g. rivers, lakes, reservoirs, etc.) through the discharge J Chem Technol Biotechnol 2020; 95: 20-26

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“…For example, following microwave irradiation with granular activated carbon concentrations of 10, 30, or 50 g/L, humic acids removal after 90 s was 16, 40 and 42%, respectively. This is explained by the fact that granular activated carbon eff ely adsorbs various organic pollutants due to its extensive porous surface area, which presents many binding sites for adsorbate species to interact with (Jiang et al 2017;Ni et al 2015). When MW and GAC are used together, the microwave irradiation can directly heat the inside of the GAC through permanent dipole rotation and ionic conduction loss (Wei et al 2012).…”

Section: Degradation Of Humic Acids Using Microwavegranular Activatedmentioning

confidence: 99%

Efficient microwave degradation of humic acids in water using persulfate and activated carbon

et al. 2018

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Humic acids are complex mixtures of organic molecules of different sizes, molecular weights and functional groups such as phenols, carboxyls, quinones and amino acids. Humic acids occur ubiquitously in media where organic matter is decomposing, such as waters, soils, sediments and organic wastes. The presence of humic acids in untreated water inhibits the oxidation of target pollutants through competing reactions and generates toxic disinfection by-products during the classical disinfection method of chlorination. There is therefore a need for alternative methods that remove humic acids. Here, degradation of humic acids at 10 mg/L was tested using 1000 W microwave irradiation assisted by 0.25-1.2 mM persulfate, with granular activated carbon at 10-50 g/L, at pH 3.0-12.0. In 90s, the highest removal of humic acids, of 75%, and humic acids mineralization, of 41%, was obtained using 1000 W microwave, 50 g/L granular activated carbon and 0.5 mM persulfate at pH 8.0. Under the same conditions without persulfate, removal was only 42% and mineralization 24%. Removal was lower than 7% using either persulfate or microwave alone. High removal with microwave, persulfate and granular activated carbon may be explained by enhanced generation of SO •− and • OH radicals and also by better trapping/encapsulation/binding of humic acids in the granular activated carbon matrix.

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Removal of Intermediate Aromatic Halogenated DBPs by Activated Carbon Adsorption: A New Approach to Controlling Halogenated DBPs in Chlorinated Drinking Water

Cited by 251 publications

References 59 publications

Photochlorination-induced transformation of graphene oxide: Mechanism and environmental fate

Photochlorination-induced transformation of graphene oxide: Mechanism and environmental fate

Potential toxicity and implication of halogenated byproducts generated in MBR online‐cleaning with hypochlorite

Efficient microwave degradation of humic acids in water using persulfate and activated carbon

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