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Journal Article 7

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adsorption 2

micropollutant 2

micropollutant removal 2

Backwashing 1

Comammox bacteria 1

Community composition 1

Micropollutant degradation 1

Micropollutants 1

Nitrogen removal 1

Reactor operation 1

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Sand filter 1

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acid chlorides 1

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biofiltration 1

covalent crosslinking 1

desalination 1

dissolved organic matters 1

gas chromatography-mass spectrometry (GC-MS) 1

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Impacts of backwashing on micropollutant removal and associated microbial assembly processes in sand

Frontiers of Environmental Science & Engineering 2023, Volume 17, Issue 3, doi: 10.1007/s11783-023-1634-z

Abstract:

● Backwashing in sand filters with 2-h and 4-h EBCTs was simulated.

Keywords: Sand filter     Backwashing     Recovery     Micropollutants     Community composition    

The effect of altering crosslinker chemistry during interfacial polymerization on the performance of nanofiltration membranes for desalination, organic, and micropollutants removal

Frontiers of Chemical Science and Engineering 2023, Volume 17, Issue 12,   Pages 2025-2036 doi: 10.1007/s11705-023-2356-2

Abstract: Chemistry of the polyamide active layer of a desalination membrane is critical in determining both its physical and chemical properties. In this study, we designed and fabricated three novel membranes with different active layers using the crosslinkers: terephthaloyl chloride, isophthaloyl chloride, and trimesoyl chloride. The crosslinkers were reacted with an aqueous solution of an aliphatic tetra-amine. Because these crosslinkers differ in their structures and crosslinking mechanisms during interfacial polymerization, the resultant membranes also possess different structural properties. The water contact angle of the fabricated membranes also varies; the water contact angles of 4A-3P-TPC@PSF/PET, 4A-3P-TMC@PSF/PET, and 4A-3P-IPC@PSF/PET, are 68.9°, 65.6°, and 53.9°, respectively. Similarly, the desalination performance of resultant membranes also showed variations, with 4A-3P-TPC@PSF/PET, 4A-3P-IPC@PSF/PET, and 4A-3P-TMC@PSF/PET having a permeate flux of 17.14, 25.70, and 30.90 L·m−2·h−1, respectively, at 2.5 MPa. The 4A-3P-TPC@PSF/PET membrane exhibited extensive crosslinking with aliphatic linear amine, and cationic dye rhodamine B, MgCl2, and amitriptyline rejection rates of 98.6%, 92.7% and 80.9%, respectively. The 4A-3P-TMC@PSF/PET membrane showed mediocre performance, while 4A-3P-IPC@PSF/PET membrane showed even lower performance, with a 35% rejection of methyl orange dye.

Keywords: acid chlorides     covalent crosslinking     desalination     linear aliphatic amine     micropollutant removal    

Combined process of biofiltration and ozone oxidation as an advanced treatment process for wastewater reuse

Xinwei LI,Hanchang SHI,Kuixiao LI,Liang ZHANG

Frontiers of Environmental Science & Engineering 2015, Volume 9, Issue 6,   Pages 1076-1083 doi: 10.1007/s11783-015-0770-5

Abstract: However, micropollutant removal efficiency was negatively affected by the nitrite produced by DNBF.

Keywords: wastewater treatment     micropollutant removal     ozonation     biofiltration     toxicity    

Preparation of a permanent magnetic hypercrosslinked resin and assessment of its ability to remove organic micropollutants from drinking water

Wei WANG,Yan MA,Qing ZHOU,Chendong SHUANG,Mancheng ZHANG,Aimin LI

Frontiers of Environmental Science & Engineering 2015, Volume 9, Issue 1,   Pages 96-104 doi: 10.1007/s11783-014-0724-3

Abstract: A rapid and effective method based on a novel permanent magnetic hypercrosslinked resin W150 was proposed for the removal of organic micropollutants in drinking water. W150 was prepared by suspension and post-crosslinking reaction and found to possess a high specific surface area of 1149.7 m ·g , a small particle size of 50 μm to 100 μm, and a saturation magnetization as high as 8 emu·g . W150 was used to eliminate nitrofurazone (NFZ) and oxytetracycline (OTC) from drinking water compared with commercial adsorbents XAD-4 and F400D. The adsorption kinetics of NFZ and OTC onto the three adsorbents well fitted the pseudo-second-order equation ( >0.972), and the adsorption isotherms were all well described by the Freundlich equation ( >0.851). Results showed that the reduction in adsorbent size and the enlargement in sorbent pores both accelerated adsorption. Moreover, the effect of particle size on adsorption was more significant than that of pore width. Given that the smallest particle size and the highest specific surface area were possessed by W150, it had the fastest adsorption kinetics and largest adsorption capacity for NFZ (180 mg·g ) and OTC (200 mg·g ). For the adsorbents with dominant micropores, the sorption of large-sized adsorbates decreased because of the inaccessible micropores. The solution pH and ionic strength also influenced adsorption.

Keywords: permanent magnetic resin     organic micropollutant     pore size     molecular size     adsorption    

Simultaneous analysis of five taste and odor compounds in surface water using solid-phase extraction and gas chromatography-mass spectrometry

Wenfeng SUN, Ruibao JIA, Baoyu GAO

Frontiers of Environmental Science & Engineering 2012, Volume 6, Issue 1,   Pages 66-74 doi: 10.1007/s11783-010-0257-3

Abstract: In this paper, a method using solid-phase extraction (SPE) and gas chromatography-mass spectrometry (GC-MS) was developed to simultaneously analyze five taste and odor compounds in surface water, i.e., 2-methylisoborneol (2-MIB), 2,4,6-trichloroanisole (TCA), 2-isopropyl-3-methoxy pyrazine (IPMP), 2-isobutyl-3-methoxy pyrazine (IBMP), and -1,10-dimethyl- -9-decalol (geosmin, GSM). The mass spectrometry was operated in selective ion monitoring (SIM) mode. Three kinds of SPE columns and three eluting solvents were compared, the C18 column was chosen as optimum SPE column, and methanol was chosen as the optimum eluting solvent. It was found that the method showed good linearity in the range of 1–200 ng·L and gave detection limits of 0.5–1.5 ng·L for individual compounds. Good recoveries (93.5%–108%) and relative standard deviations (1.58%–7.31%) were also obtained. Additionally, concentrations of these taste and odor compounds in Jinan’s surface and drinking water were analyzed by applying this method, and the results showed that GSM and 2-MIB were the dominant taste and odor compounds in Jinan’s raw water.

Keywords: extraction (SPE)     gas chromatography-mass spectrometry (GC-MS)     taste and odor compounds     surface water     micropollutant    

Preparation of a novel anion exchange group modified hyper-crosslinked resin for the effective adsorption of both tetracycline and humic acid

Qing ZHOU, Mengqiao WANG, Aimin LI, Chendong SHUANG, Mancheng ZHANG, Xiaohan LIU, Liuyan WU

Frontiers of Environmental Science & Engineering 2013, Volume 7, Issue 3,   Pages 412-419 doi: 10.1007/s11783-013-0483-6

Abstract: A novel hyper-crosslinked resin (MENQ) modified with an anion exchange group was prepared using divinylbenzene (DVB) and methyl acrylate (MA) as comonomers via four steps: suspension polymerization, post-crosslinking, ammonolysis and alkylation reactions. The obtained resin had both a high specific surface area (793.34 m ·g ) and a large exchange capacity (strong base anion exchange capacity, SEC: 0.74 mmol·g , weak base anion exchange capacity, WEC: 0.45 mmol·g ). XAD-4 was selected as an adsorbent for comparison to investigate the adsorption behavior of tetracycline (TC) and humic acid (HA) onto the adsorbents. The results revealed that MENQ could effectively remove both TC and HA. The adsorption capacity of XAD-4 for TC was similar to that of MENQ, but XAD-4 exhibited poor performance for the adsorption of HA. The adsorption isotherms of TC and HA were well-fitted with the Freundlich model, which indicated the existence of heterogeneous adsorption through cation-π bonding and π–π interactions. The optimal solution condition for the adsorption of TC was at a pH of 5–6, whereas the adsorption of HA was enhanced with increasing pH of the solution.

Keywords: high surface area     adsorption     anion exchange     micropollutant     dissolved organic matters    

Occurrence and Roles of Comammox Bacteria in Water and Wastewater Treatment Systems: A Critical Review Review

Naga Raju Maddela, Zhihao Gan, Yabing Meng, Fuqiang Fan, Fangang Meng

Engineering 2022, Volume 17, Issue 10,   Pages 196-206 doi: 10.1016/j.eng.2021.07.024

Abstract:

Nitrogen removal is a critical process in water treatment plants (WTPs) and wastewater treatment plants (WWTPs). The recent discovery of a novel bacterial process, complete ammonia oxidation (comammox, CMX), has refuted a century-long perception of the two-step conversion of NH3 to NO3. Compared with canonical nitrifiers, CMX bacteria offer undeniable advantages, such as a high growth yield propensity and adaptability to nutrient- and growth-limiting conditions, which collectively draw attention to validate the aptness of CMX bacteria to wastewater treatment. As there has been no comprehensive review on the relevance of CMX bacteria for sustainable water and wastewater treatment, this review is intended to discuss the roles and applications of CMX in the removal of nitrogen and pollutants from water and wastewater. We took into account insights into the metabolic versatilities of CMX bacteria at the clade and subclade levels. We focused on the distribution of CMX bacteria in engineered systems, niche differentiation, co-occurrence and interactions with canonical nitrifiers for a better understanding of CMX bacteria in terms of their ecophysiology. Conceptualized details on the reactor adaptability and stress response of CMX bacteria are provided. The potential of CMX bacteria to degrade micropollutants either directly or co-metabolically was evaluated, and these insights would be an indispensable advantage in opening the doors for wider applications of CMX bacteria in WWTPs. Finally, we summarized future directions of research that are imperative in improving the understanding of CMX biology.

Keywords: Comammox bacteria     Wastewater treatment     Nitrogen removal     Micropollutant degradation     Reactor operation    

Title Author Date Type Operation

Impacts of backwashing on micropollutant removal and associated microbial assembly processes in sand

Journal Article

The effect of altering crosslinker chemistry during interfacial polymerization on the performance of nanofiltration membranes for desalination, organic, and micropollutants removal

Journal Article

Combined process of biofiltration and ozone oxidation as an advanced treatment process for wastewater reuse

Xinwei LI,Hanchang SHI,Kuixiao LI,Liang ZHANG

Journal Article

Preparation of a permanent magnetic hypercrosslinked resin and assessment of its ability to remove organic micropollutants from drinking water

Wei WANG,Yan MA,Qing ZHOU,Chendong SHUANG,Mancheng ZHANG,Aimin LI

Journal Article

Simultaneous analysis of five taste and odor compounds in surface water using solid-phase extraction and gas chromatography-mass spectrometry

Wenfeng SUN, Ruibao JIA, Baoyu GAO

Journal Article

Preparation of a novel anion exchange group modified hyper-crosslinked resin for the effective adsorption of both tetracycline and humic acid

Qing ZHOU, Mengqiao WANG, Aimin LI, Chendong SHUANG, Mancheng ZHANG, Xiaohan LIU, Liuyan WU

Journal Article

Occurrence and Roles of Comammox Bacteria in Water and Wastewater Treatment Systems: A Critical Review

Naga Raju Maddela, Zhihao Gan, Yabing Meng, Fuqiang Fan, Fangang Meng

Journal Article