Environmental Science-Water Research & Technology
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2019
·Vol. 5
·期 4
·672-683
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IF 4.195
Fangshu Qu,Hao Wang,Junguo He,Gongduan Fan,Zhihui Pan,Jiayu Tian,Hongwei Rong,Guibai Li,Huarong Yu
Permeability loss and the low retention efficiency of soluble organics significantly restrict the application of ultrafiltration (UF) for water reclamation. In this work, the tertiary treatment of secondary effluent using UF was investigated under a variety of transmembrane pressures (TMPs) (20–150 kPa) to obtain more insight into fouling by effluent organic matter (EfOM) and its impact on organic rejection, particularly for hydrophobic pharmaceuticals represented by carbamazepine and naproxen. The flux decline and the reversible fouling during secondary effluent filtration were substantially aggravated with increasing TMP, whereas the irreversible fouling was generally reduced, as attributed to restriction of EfOM adhesion to the membrane surface by the fouling layer. The fouling process was successively dominated by pore blocking and cake layer filtration, and the shift in the dominant mechanism was accelerated under higher TMPs. The rejection of EfOM was improved in the presence of a fouling layer, which acted as a secondary filtration medium, particularly at higher TMPs. The maximum rejection of hydrophobic pharmaceuticals by UF was observed in a moderate TMP range (40–60 kPa), probably due to a trade-off between increased fouling layer retention and reduced rejection due to increased wall shear and aggravated cake-enhanced concentration polarization with increasing TMP. The results would encourage the strategy of utilizing the fouling layer for irreversible-fouling restriction and better rejection of hydrophobic PhACs.
研究领域:
环境科学
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水处理工程
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产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2024
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IF 8.1
Rui Ma,Xiaoxiang Cheng,Xinsheng Luo,Tao Yang,Daoji Wu,Heng Liang
Herein, sodium hypochlorite (NaClO) and peroxomonosulfate (PMS) were systematically compared in enhancing vacuum ultraviolet (VUV) oxidation for alleviating ultrafiltration membrane fouling of effluent organic matter. Results indicated that VUV/NaClO pre-treatment exhibited significantly better performance than VUV/PMS, with the irreversible fouling resistance reduced by 64 %. Simultaneously, 96 % of fluorescent substances were removed by VUV/NaClO, and an apparent decrease in surface deposits was observed, with membrane pores exposed and clearly visible. The calculation results through the extended Derjaguin-Landau-Verwey-Overbeek theory indicated that the enhanced hydrophilicity of pollutants reduced the tendency of pollutants to adhere to the membrane surface, leading to the weakening of membrane fouling degree. In the VUV/PMS process, HO • and SO 4 •– were detected with steady-state concentrations of 8.55 × 10 -14 and 1.53 × 10 -13 M. By contrast, the VUV/NaClO system generated HO • , Cl • , ClO • , and Cl 2 •– with steady-state concentrations of 1.15 × 10 -13 , 8.79 × 10 -14 , 7.30 × 10 -13 and 1.50 × 10 -13 M. In conclusion, VUV/NaClO pre-treatment demonstrated high efficiency and significant potential in improving water quality and decreasing membrane fouling in secondary effluent treatment.
研究领域:
环境科学
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水处理工程
✓ 已验证
产品关联
DOI
高影响因子
Water
·
2022
·Vol. 14
·期 11
·1726
·
IF 3.53
Xiao Liu,Renglu Chen,Zijing Wang,Wei Lin,Rourou Zhang,Shengping Yu,An Ding
The secondary effluent of the wastewater treatment plant is considered as one of the reused water sources and needs advanced treatment to meet increasingly stringent water treatment standards. Ultrafiltration, as one of the most widely used advanced treatment technologies, is limited due to membrane fouling, and coagulation and pre-oxidation have received extensive attention as pretreatment methods to alleviate membrane fouling. This research proposes a new method of Fe(II)-activated peroxymonosulfate (PMS) coagulation and a pre-oxidation system coupled with ultrafiltration (UF) to treat secondary effluent from sewage plants, separately evaluating the treatment effect under different molar ratios of Fe(II)/PMS. The Fe(II)/PMS decontamination mechanism and membrane fouling control effect were elucidated through pollutant removal efficiency, membrane morphology, membrane flux trend, and membrane fouling resistance distribution. According to the experimental results, the optimal effect of organic matter removal and membrane fouling mitigation was achieved at the Fe(II)/PMS dosage of 60/60 μM/μM (molar ratio 1:1). The efficiency of pretreatment methods in removing organics and fluorescent components and mitigating membrane fouling followed the order of Fe(II)/PMS > Fe(III) > inactivated PMS. Fe(II)/PMS could produce a synergistic effect in a high concentration state (60 μM), relying on the dual effects of coagulation and oxidation to alleviate membrane fouling. Coagulation and pre-oxidation by Fe(II)/PMS significantly reduced the clogging of membrane pores and the proportion of irreversible resistance, effectively controlling membrane fouling and improving effluent quality. SEM images further confirmed its effectiveness, and EPR results unequivocally indicated that its synergistic mechanism was mediated by •OH and SO4•−. The research results can provide ideas for advanced wastewater treatment and secondary effluent reuse.Keywords:ultrafiltration;membrane fouling;coagulation;pre-oxidation;ferrous-activated peroxymonosulfate;secondary effluent
研究领域:
环境工程
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水处理
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膜技术
✓ 已验证
产品关联
DOI
高影响因子
Processes
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2022
·Vol. 10
·期 8
·1622
·
IF 3.352
Hai Lu,Xiaoyan Wang,Xueqi Li,Xiaoyu Zhang
The combined disinfection process of ultraviolet and sodium hypochlorite has more advantages than the single disinfection method in reducing the disinfectant dosage, shortening the reaction time, and resisting the impact of water quality changes and inhibiting the light reactivation of microorganisms. Given this, using the secondary effluent of a sewage plant as the research object, the disinfection efficiency of the combined process of ultraviolet and sodium hypochlorite was investigated. The experimental results showed that the inactivation effect of UV followed by sodium hypochlorite on fecal coliform and the inhibition of microbial photoreactivation was more significant than that of simultaneous disinfection of UV and sodium hypochlorite disinfection. When the UV dose was 24 mJ/cm2, after disinfection with UV followed by sodium hypochlorite, only 1 mg/L of sodium hypochlorite was required to be added, and a contact reaction time of 1 min for the fecal coliform index to meet the first-Class A emission standard. After disinfection, the effluent’s maximum reactivation rate of fecal coliform was 26.96%. However, the simultaneous disinfection of ultraviolet and sodium hypochlorite required the addition of 3 mg/L of sodium hypochlorite. After disinfection, the maximum reactivation rate of the fecal coliform group reached 30.81%.
研究领域:
环境科学
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微生物学
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DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
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2018
·Vol. 25
·期 31
·31358-31367
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IF 2.8
Wan Zhong,Wang Jianlong
The advanced treatment of municipal secondary effluent by heterogeneous and homogeneous Fenton processes using Fe/Ce-RGO (reduced graphene oxide) and Fe 2+ as catalysts was studied and compared. Sulfamethazine (SMT) was spiked in the effluent to examine the effectiveness of the emerging contaminant removal. The Fe/Ce-RGO catalyst was characterized using a scanning electron microscope (SEM) and cycle voltammetry curves. The removal of dissolved organic carbon (DOC), soluble chemical oxygen demand (SCOD), SMT, and ultraviolet-visible spectroscopy in 254 nm (UV 254 ) of municipal secondary effluents was examined. The DOC removal efficiency of secondary effluent (without addition of SMT) was 36.30% and 11.74% using Fe/Ce-RGO and Fe 2+ as catalysts, respectively. The removal efficiency of DOC, SCOD, and SMT in heterogeneous Fenton process was higher than that in homogeneous Fenton process. The changes of three-dimensional excitation-emission matrix (3DEEM) fluorescence, soluble microbial products (SMPs), humic acids, and UV 254 were determined, and the results indicated that UV 254, aromatic proteins, and humic acids decreased rapidly in both processes; however, polysaccharides and protein-like substances were difficult to degrade. Although some toxic substances produced after Fenton-like treatment, the biodegradability of the treated effluent was enhanced.
研究领域:
环境科学
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污水处理
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催化材料
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产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2024
·
IF 13.3
Xiao-Yan Fan,Shi-Long Xu,Xing Li,Zhi-Wei Zhou,Yu-Xi Gao,Jun-Ru Zhao,Zhong-Xing Zhang
Antibiotic resistance genes (ARGs) and mobile genetic elements (MGEs) in secondary effluent from wastewater treatment plants (WWTPs) have a size-fractionated character and conventional processes have difficulties in removing ARGs and MGEs. Therefore, this study aimed to explore the removal efficiency, removal mechanism and regeneration potential of size-fractionated ARGs and MGEs by vacuum ultraviolet (VUV)-activated peroxymonosulfate (PMS) and ascertain their potential hosts in secondary effluent. The proportion of particle-associated (PA)-ARGs and PA-MGEs was 85.07 %, followed by free-living (FL) fraction (14.91 %) and cell-free (CF) fraction (0.02 %). More than 95.00 %∼99.99 % of ARGs and MGEs in PA- and CF- fractions were removed by VUV/PMS, but the average removal efficiency of FL-ARGs and FL-MGEs was 66.15 %. Compared to the regeneration potential of PA- and CF-ARGs and MGEs (0.02 < C/C 0 < 5.27), the regeneration occurred mainly in FL-ARGs and FL-MGEs (0.08 < C/C 0 < 24.06). ·OH was the dominant radical (16.810 × 10 -6 mol/L) in VUV/PMS for the removal of size-fractionated ARGs and MGEs from the secondary effluent, while SO 4 - · (4.478 × 10 -6 mol/L) played a supporting role in the system based on the quenching experiment, electron paramagnetic resonance spectrometer and probe experiments. Based on full-scale classification, conditionally rare or abundant taxa (CRAT) were the core potential hosts in PA-, FL- and CF- fractions, while rare taxa (RT) and conditionally rare taxa (CRT) potential hosts were more diverse in the three fractions. This study suggests that VUV/PMS can effectively remove size-fractionated ARGs and MGEs from secondary effluent and thereby obviously reduce their dissemination risk to receiving water bodies, providing technical support for the engineering application of VUV/PMS in full-scale WWTPs .
研究领域:
环境科学
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微生物学
✓ 已验证
产品关联
DOI
高影响因子
Environmental Science-Processes & Impacts
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2024
·
IF 4.3
Zi-Chen Yang,Wen-Long Wang,Zi-Bo Jing,Yi-Qing Jiang,He-Qing Zhang,Min-Yong Lee,Lu Peng,Qian-Yuan Wu
The control of viruses in water is critical to preventing the spread of infectious viral diseases. Many oxidants can inactivate viruses, and this study aims to systematically compare the disinfection effects of ozone (O3), peroxymonosulfate (PMS), and hydrogen peroxide (H2O2) on MS2 coliphage. The effects of oxidant dose and contact time on disinfection were explored, as were the disinfection effects of three oxidizing agents in secondary effluent. The 4-log inactivation of MS2 coliphage required 0.05 mM O3, 0.5 mM PMS, or 25 mM H2O2 with a contact time of 30 min. All three oxidants achieved at least 4-log disinfection within 30 min, and O3 required only 0.5 min. In secondary effluent, all three oxidants also achieved 4-log inactivation of MS2 coliphage. Excitation–emission matrix (EEM) results indicate that all three oxidants removed dissolved organic matter synchronously and O3 oxidized dissolved organic matter more thoroughly while maintaining disinfection efficacy. Considering the criteria of oxidant dose, contact time, and disinfection efficacy in secondary effluent, O3 is the best choice for MS2 coliphage disinfection among the three oxidants.
研究领域:
环境科学
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水处理
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病毒学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MEMBRANE SCIENCE
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2023
·
IF 9.5
Yang Li,Bingxuan Ji,Ziyang Chen,Zhenghua Zhang
Secondary effluent from municipal wastewater treatment plants can be used to produce reclaimed water through membrane distillation (MD), providing a potential solution to the current global water crisis. However, membrane fouling over extended periods of operation reduces the separation performance of MD systems and significantly shortens the operational life-span of the membrane. Herein, in order to overcome these limitations, a novel surface-modified PTFE membrane was fabricated by depositing polydopamine and grafting dextro ( d )-tyrosine (Tyr/PDA@PTFE). This synergistic coating was designed to reduce surface hydrophobicity of the PTFE membrane and provide anti-adhesive properties for bacteria, while enhancing flux and anti-fouling performance during MD. The Tyr/PDA@PTFE membranes demonstrated enhanced MD performance and the Tyr-300/PDA@PTFE membrane (with d -tyrosine coating solution concentration of 300 μM) exhibited the best MD performance during direct contact membrane distillation (DCMD) of the secondary effluent, with the highest flux (49.1 LMH) compared with the pristine PTFE membrane (34.7 LMH), achieving a flux increase of 41.5%. Long-term DCMD operation showed that the Tyr-300/PDA@PTFE membrane exhibited improved anti-fouling performance compared with the pristine PTFE membrane, with 43.8% flux decay observed after three cycles of use, while the pristine PTFE membrane was unable to complete three cycles of use with an 87.2% decrease in flux observed by middle of the third round. The quality of permeate formed by the Tyr/PDA@PTFE membranes during MD, indicated that they could be operated stably for three cycles of use over a 40 h period, intercepting organic matter in the feed solution. The Tyr-300/PDA@PTFE membrane was especially effective for the removal of low molecular weight and humus-like substances, achieving rejection rates of 89.5% and 86.7%, respectively. Additionally, the Tyr/PDA@PTFE membrane carried the more negative charge and exhibited a high level of resistance to bio-adhesion. This study demonstrates the feasibility of use of this novel Tyr/PDA@PTFE membrane in MD, for the effective treatment of secondary effluent from wastewater treatment plants and the production of reclaimed water.
研究领域:
环境工程
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水处理
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膜科学
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废水回用
✓ 已验证
产品关联
DOI
高影响因子
Journal of Water Process Engineering
·
2025
·
IF 6.7
Zhiwei Zhou,Junyan Chen,Haikuan Yu,Yuantian Zhao,Xing Li,Jiawei Ren
Secondary effluent organic matter (EfOM) significantly contributes to membrane fouling in ultrafiltration (UF) systems, which limits their broader use in municipal wastewater recycle. A modified ceramic ultrafiltration membrane (MCUM) was synthesized via vacuum filtration and thermal treatment and then activated under ultraviolet (UV) irradiation. The results indicated that the MCUM-2.88 exhibited the most excellent removal of EfOM, effectively retained high molecular weight (MW) proteinaceous substances, and converted medium MW humic-like compounds into lower MW derivatives. Through parallel factor analysis in conjunction with the self-organizing map algorithm, it was observed that the MCUM primarily degraded aromatic, high MW fluorescent components, while tryptophan-like substances remained as dominant residues due to their resistance to photodegradation. Additionally, the improved surface roughness and hydrophilicity of the MCUM facilitated fouling mitigation by strengthening interfacial repulsion, which diminished foulant adhesion. The fouling mechanism transitioned from complete and intermediate blocking to predominantly intermediate blocking, accompanied by a reduction in gel layer fouling. Consequently, the reversible fouling resistance of the MCUM was reduced by 76.8 %, and the irreversible resistance by 34.3 %, markedly enhancing antifouling performance. The results underscore the effectiveness of MCUM in advanced municipal wastewater treatment, showcasing enhanced antifouling performance and strong potential for sustainable water reuse applications.
研究领域:
环境工程
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膜科学
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水处理
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催化
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
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2024
·
IF 7.4
Bei Ye,Wen-Long Wang,Chen-Xin Xu,Wei Wang,Min-Yong Lee,Shu-Yan Zhan,Qian-Yuan Wu
Microbubble aeration can greatly improve ozonation by enhancing ozone transfer and subsequent hydroxyl radical formation. Here, we applied microbubble ozonation to treat pharmaceuticals and personal care products (PPCPs) in several municipal secondary effluents. Compared with conventional ozonation, microbubble ozonation efficiently eliminated both ozone-reactive and ozone-resistant PPCPs and greatly reduced the ozone doses in the complex water matrixes of the secondary effluents. In addition, compared with millibubble ozonation, the removal of chemical oxygen demand (COD) increased by 32.0 %–67.2 % at 60 mg/L ozone dose during microbubble ozonation. The carbon emission of microbubble ozonation varied in different water matrix, and was 47–76 % less than that of millibubble ozonation. The oxidizing capacity ratio of microbubble to millibubble for PPCPs was between 1.26 and 3.50 times, and ozone-resistant PPCPs removal was enhanced more than ozone-reactive PPCPs by microbubble ozonation. Specifically, the oxidizing capacity ratio of microbubble to millibubble for carbamazepine (ozone-reactive) was 1.30–2.43 times, whereas that for N,N -diethyl-3-tolumide (ozone-resistant) was 1.88–3.50 times. Microbubble ozonation also greatly decreased the UV absorbance and fluorescence for all of the water samples. The UV absorbance at 254, 280, and 320 nm decreased by 64.0 %–83.8 %, and the fluorescence peak intensity decreased by more than 94 %. Surrogates for the removal of PPCPs and COD were evaluated and compared. This study provides new insights into the application of microbubble ozonation to control PPCPs in secondary effluents.
研究领域:
环境工程
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水处理
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化学工程
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2022
·
IF 16.744
Xiaoxiang Cheng,Yongrui Zhang,Qingshui Fan,Lin Wang,Shuai Shi,Xinsheng Luo,Xuewu Zhu,Daoji Wu,Heng Liang
To improve the efficiency of wastewater reclamation, a novel Co 3 O 4 @carbon nanotubes modified ceramic membrane (Co 3 O 4 @CNT-CM) was prepared in this work for simultaneous catalytic peroxymonosulfate (PMS) oxidation and filtration of secondary effluent. The synthesized Co 3 O 4 @CNT catalyst showed better dispersibility with more active sites exposed, and Co 3 O 4 @CNT-CM exhibited relatively smooth surface, higher permeate flux and excellent catalytic PMS ability. The antifouling and water purification performance of Co 3 O 4 @CNT-CM were systematically investigated in secondary effluent purification. With the dual effect of catalytic oxidation and filtration, the organic pollutants were observably reduced. Fluorescent components were also significantly removed, and more macromolecular substances were degraded into small molecular substances. The flux of Co 3 O 4 @CNT-CM was significantly improved, with the reversible and irreversible resistances decreased by 82.5% and 78.6%, individually. With respect to the fouling mechanism, the volume entering the stage of cake filtration dramatically increased. The prepared Co 3 O 4 @CNT-CM accelerated the generation of various active species for oxidative degradation of pollutants, thus improving the antifouling performance of membrane. These results demonstrated the application potential of Co 3 O 4 @CNT-CM for wastewater treatment and reclamation.
研究领域:
环境工程
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水处理
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膜技术
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催化
✓ 已验证
产品关联
DOI
高影响因子
DESALINATION
·
2023
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IF 9.9
Xinyu Zhang,Zhenglun Lin,Daoji Wu,Ming Xie,Jingtao Xu,Xian Bao,Xiaoxiang Cheng,Ying Wang,Feiyong Chen
Reverse osmosis (RO) has been recognized as a promising technology to treat municipal wastewater . However, membrane fouling is still an important hurdle in the RO membrane operation. The present work demonstrates the facile and high-effective fabrication of a robust antifouling RO membrane by the codeposition of Noria with zwitterionic copolymers . This modified coating is irreversibly bound to the membrane during typical membrane operational conditions. Compared with the pristine membrane , the modified membrane (that is, the TFC-Co-8 membrane) possesses improved hydrophilicity , reduced roughness, and lower negative charge. Our results illustrate that the TFC-Co-8 membrane displays an excellent antifouling property with milder flux decline and higher flux recovery during protein and alginate filtrations. Additionally, the TFC-Co-8 membrane is applied in the treatment of actual secondary effluent and also exhibits a superior antifouling property, which is consistent with the results of the simulated solution. This work provides a reference for the design of antifouling RO membrane in reclaimed water production.
研究领域:
水处理
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膜科学
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环境工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）