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Electrochemical Removal of Chlorophenol Pollutants by Reactive Electrode Membranes: Scale-Up Strategy for Engineered Applications

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Engineering 2022年第2期8卷 77-84页

作者： Shuzhao Pei Yi Wang Shijie You Zhanguo Li nanqi ren State Key Laboratory of Urban Water Resource and Environment School of EnvironmentHarbin Institute of TechnologyHarbin 150090China State Key Laboratory of NBC Protection for Civilian Beijing 102205China

Chlorophenols(CPs)are significant refractory pollutants that are highly toxic to humans and other *** electrode membranes(REMs)show considerable potential in the electrochemical removal of refractory pollutants by allowing flow-through operations with convection-enhanced mass ***,relevant studies are commonly performed on the laboratory scale,and there is no straightfor-ward method that guarantees success in scaling up engineered REM *** this study,we demon-strated that a tubular concentric electrode(TCE)configuration with a titanium suboxide ceramic anode and a stainless-steel cathode is suitable for large-scale CPs *** theoretical and experi-mental results showed that the TCE configuration not only allows the electrode surface to be orthogonal to electric field lines everywhere,but also has an ohmic resistance that is inversely proportional to the length of the *** addition,the TCE configuration can be operated in either the anode-to-cathode(AC)or the cathode-to-anode(CA)mode based on the flow direction,creating adjustable condi-tions for selective degradation of *** was confirmed by 98%removal of 2,4-dichlorophenol(2,4-DCP)and 72.5%removal of chemical oxygen demand(COD)in the CA mode,in which the kinetic constant was one order of magnitude higher than that for the AC mode under flow-through single-pass *** can be explained by the lower activation energy and free energy in the CA mode,as revealed by the-oretical calculations and experimental *** TCE configuration is also suitable for a numbering-up strategy to scale up the electrochemical reactor without increasing the ohmic resistance or decreasing the specific electrode area,achieving 99.4%removal of 2,4-DCP with an energy consump-tion of 1.5 kW·h·m^(-3) when three TCE modules were *** study presents a suitable electrode design configuration for the REM reactor,offering effective strategies to bridge the“Valley of Deat

关键词： Chlorophenols Reactive electrode membrane Tubular concentric electrode Scale-up

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Selective activation of peroxymonosulfate to singlet oxygen by engineering oxygen vacancy defects in Ti_(3)CNT_(x) MXene for effective removal of micropollutants in water

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Fundamental Research 2023年第5期3卷 770-776页

作者： Limin Jin Shijie You nanqi ren Yanbiao Liu College of Environmental Science and Engineering Textile Pollution Controlling Engineering Center of the Ministry of Ecology and EnvironmentDonghua University2999 North Renmin RoadShanghai 201620China State Key Laboratory of Urban Water Resource and Environment School of EnvironmentHarbin Institute of TechnologyHarbin 150090China

Defect engineering is an effective strategy to boost the catalytic activity of MXene towards heterogeneous peroxymonosulfate(PMS)activation for water ***,we developed a facile approach to fine-tune the generation of oxygen vacancies(OVs)on Ti_(3)CNT_(x)crystals by Ce-doping(Ce-Ti_(3)CNT_(x))with the aim of mediating PMS activation for the degradation of micropollutants in *** varying the dopant content,the OV concentrations of Ti_(3)CNT_(x)could be varied to enable the activation of PMS to almost 100%singlet oxygen(1O2),and hence the effective degradation of sulfamethoxazole(SMX,a model micropollutant).Various advanced characterization techniques were employed to obtain detailed information on the microstructure,morphology,and defect states of the *** experimental results showed that SMX removal was proportional to the OVs *** functional theory(DFT)models demonstrated that,in contrast to pristine Ti_(3)CNT_(x),the OVs on 10%CeTi_(3)CNT_(x)could adsorb the terminal O of PMS,which facilitated the formation of SO_(5)•−as well as the generation of *** further loaded the optimized catalysts onto a polytetrafluoroethylene microfiltration membrane and also demonstrated the efficient removal of SMX from water using a convection-enhanced mass transport flowthrough *** study provides new insights into the effective removal of micropollutants from water by integrating state-of-the-art defect engineering,advanced oxidation,and microfiltration techniques.

关键词： Oxygen vacancy Ce-doped MXene Peroxymonosulfate activation Singlet oxygen Water decontamination

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Sustainable Generation of Sulfate Radicals and Decontamination of Micropollutants via Sequential Electrochemistry

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Engineering 2023年第11期30卷 144-152页

作者： Wentian Zheng Shijie You Yuan Yao nanqi ren Bin Ding Fang Li Yanbiao Liu College of Environmental Science and Engineering Donghua UniversityShanghai 201620China State Key Laboratory of Urban Water Resource and Environment School of EnvironmentHarbin Institute of TechnologyHarbin 150090China MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage School of Chemistry and Chemical EngineeringHarbin Institute of TechnologyHarbin 150080China Innovation Center for Textile Science and Technology College of TextilesDonghua UniversityShanghai 200051China Shanghai Institute of Pollution Control and Ecological Security Shanghai 200092China

The removal of emerging micropollutants in the aquatic environment remains a global *** routes are often chemically,energetically,and operationally intensive,which decreases their sustainability during ***,we develop an advanced chemical-free strategy for micropollutants decontamination that is solely based on sequential electrochemistry involving ubiquitous sulfate anions in natural and engineered *** can be achieved via a chain reaction initiated by electrocatalytic anodic sulfate(SO_(4)^(2-))oxidation to produce persulfate(S_(2)O_(8)^(2-))and followed by a cathodic persulfate reduction to produce sulfate radicals(SO_(4)^(·-)).These SO_(4)^(·-)are powerful reactive species that enable the unselective degradation of micropollutants and yield SO_(4)^(2-)again in the treated *** proposed flow-through electrochemical system achieves the efficient degradation(100.0%)and total organic carbon removal(65.0%)of aniline under optimized conditions with a single-pass *** also reveal the effectiveness of the proposed system for the degradation of a wide array of emerging micropollutants over a broad pH range and in complex *** work provides the first proof-ofconcept demonstration using ubiquitous sulfate for micropollutants decontamination,making water purification more sustainable and more economical.

关键词： Advanced oxidation Chain reaction Sulfate radical Micropollutants Sequential electrochemistry

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Advances in the study of directed evolution for cellulases

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Frontiers of Environmental Science & Engineering 2011年第4期5卷 519-525页

作者： Hailong LIN Weiguang LI Changhong GUO Sihang QU nanqi ren State Key Laboratory of Urban Water Resource and Environment Harbin Institute of TechnologyHarbin 150090China College of Life Science and Technology Harbin Normal UniversityHarbin 150080China

If cellulose can be effectively hydrolyzed intoglucose by cellulase,the production costs of hydrogen,ethanol or other chemicals from cellulosic materials will begreatly decreased,and economically viable production ofbiohydrogen and bioethanol will become *** degraded into glucoses by multi-component *** cellulases are widely used in brewing,food,bioenergy,fodder,textiles,paper,pharmaceuticals,environmental protection and other ***,existing cellulases have several problems that limit theirwider applications,including the low turnover number forsolid cellulosic materials,and low stability in adapting tovarious application *** example,high temperature,low pH,and so *** of directedevolution technology may be one of the most effectiveways for improving the characteristics of *** presents a brief review of the cellulases hydrolysismechanism by cellulase,advances in cellulases(endoglucanaseandβ-glucosidase)improvement by directedevolution for several characteristics(for instance,thermalstability,pH adaptability and enzyme activity),limitationsof directed evolution for cellulases,and the outlook fordirected evolution for cellulase.

关键词： biohydrogen bioethanol cellulase cellulose directed evolution

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Multistage defense response of microalgae exposed to pharmaceuticals in wastewater

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Chinese Chemical Letters 2023年第4期34卷 424-429页

作者： Yuhao Chu Chaofan Zhang Xi Chen Xue Li nanqi ren Shih-Hsin Ho State Key Laboratory of Urban Water Resource and Environment School of EnvironmentHarbin Institute of TechnologyHarbin 150090China

Recently, the use of microalgae for bioremediation of pharmaceuticals(Ph As) has attracted increasing interest. However, most studies focused more on microalgae removal performance, its defensive response to the Ph As during wastewater treatment remains unexplored. Herein, microalgal three defensive systems have been investigated in synthetic wastewater, with six Ph As as the typical drug. Results show that Ph As could bind to EPS, and this action in turn could help to alleviate the direct toxicity of Ph As to microalgae. Subsequently, the physiological analyses revealed the increase of superoxide dismutase(SOD), catalase(CAT), and peroxidase(POD) activities, potentially reducing the oxidative stress induced by Ph As. Furthermore, the enzyme activities of cytochrome P450(CYP450) and glutathione-S-transferase(GST) were significantly upregulated after exposure to SMX, CIP and BPA, followed by a significant decrease in biodegradation rates after the addition of CYP450 inhibitors, suggesting that the biotransformation and detoxification of Ph As occurred. Meanwhile, molecular docking further revealed that CYP450 could bind with Ph As via hydrogen bond and hydrophobic interaction, which proved their abilities to be metabolized and form transformation products in microalgae. These findings provide an advancing understanding of microalgae technologies to improve the treatment of wastewater contaminated with Ph As.

关键词： Microalgae Pharmaceuticals Extracellular polymeric substances Antioxidant enzyme CYP450 enzyme

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The start-up of biohydrogen-producing process by bioaugmentation in the EGSB reactor

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High Technology Letters 2006年第3期12卷 328-332页

作者：王相晶 ren nanqi Xiang Wensheng Guo Wanqian School of Municipal ＆ Environmental Engineering Harbin Institute of Technology Harbin 150090 P.R. China School of Life Science Northeast Agricultural University Harbin 150030 P.R. China

Expanded granular sludge bed （EGSB） reactor and bioaugmentation were employed to investigate biohydrogen production with molasses wastewater. The start-up experiments consisted of two stages. In the first stage （0 - 24d） seeded with activated sludge, the butyric acid type-fermentation formed when the initial expanding rate, organic loading rate （OLR）, the initial redox potential （ORP） and hydraulic retention time （HRT） were 10%, 10.0 kg COD/（m^3·d）, -215 mV and 6.7 h, respectively. At the beginning of the second stage on day 25, the novel hydrogen-producing fermentative bacterial strain B49 （AF481148 in EMBL） were inoculated into the reactor under the condition of OLR 16. 0 kg COD/（m^3·d）, ORP and HRT about - 139 mV and 6.7 h, respectively, and then the reaction system transformed to ethanol-type fermentation gradually with the increase in OLR. When OLR, ORP and HRT were about 94.3 kg COD/（m^3·d）, -250 mV and 1.7 h, respectively, the system achieved the maximum hydrogen-producing rate of 282.6 mL H2/L reactor·h and hydrogen percentage of 51% -53% in the biogas.

关键词： start-up biohydrogen production bioaugmentation hydrogen-producing bacterial strain B49 EGSB reactor

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Co-application of energy uncoupling and ultrafiltration in sludge treatment:Evaluations of sludge reduction,supernatant recovery and membrane fouling control

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Frontiers of Environmental Science & Engineering 2020年第4期14卷 43-52页

作者： An Ding Yingxue Zhao Zhongsen Yan Langming Bai Haiyang Yang Heng Liang Guibai Li nanqi ren State Key Laboratory of Urban Water Resource and Environment(SKLUWRE) Harbin Institute of TechnologyHarbin 150090China College of Civil Engineering Fuzhou UniversityFuzhou 350116China

Energy uncoupling is often used for sludge reduction because it is easy to operate and does not require a significant amount of extra equipments(*** additional tank required).However,over time the supernatant extracted using this method can deteriorate,ultimately requiring further *** purpose of this study was to determine the effect of using a low-pressure ultrafiltration membrane process for sludge water recovery after the sludge had undergone an energy uncoupling treatment(using 3,3’,4’,5-tetrachlorosalicylanilide(TCS)).Energy uncoupling was found to break apart sludge floe by reducing extracellular polymeric substances(EPS)and adenosine triphosphate(ATP)*** of supernatant indicated that when energy uncoupling and membrane filtration were coapplied and the TCS dosage was below 30 mg/L,there was no significant deterioration in organic component ***,ammonia and phosphate concentrations were found to increase as the concentration of TCS added ***,due to low sludge concentrations and EPS contents,addition of 30-60 mg/L TCS during sludge reduction increased the permeate flux(two times higher than the control)and decreased the hydraulic reversible and cake layer *** contrast,high dosage of TCS aggravated membrane fouling by forming compact fouling *** general,this study found that the co-application of energy uncoupling and membrane filtration processes represents an effective alternative method for simultaneous sludge reduction and sludge supernatant recovery.

关键词： Sludge reduction Energy uncoupling Ultrafiltration membrane Membrane fouling

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Preparation of excellent building materials using geopolymer instead of traditional cement

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Particuology 2024年第12期95卷 333-342页

作者： Yuanchuan ren Shanqisong Huang Yan Hu nanqi ren Lingrui Kuang Fenghui Wu Dandan Chen Xuejun Zhu Qiang Niu College of Biological and Chemical Engineering(College of Agriculture) Panzhihua UniversityPanzhihua617000China Faculty of Environmental Science and EngineeringKunming University of Science and Technology Kunming650500China School of Environment Harbin Institute of TechnologyHarbin150090China

In order to improve the resource utilization rate of aluminum ash,high-quality building materials were prepared by replacing traditional cement with aluminum ash,and the performance of building materials under different conditions and factors was *** experimental results show that when the pressure was 300 MPa and the natural curing time was 3 days,the comprehensive performance of the brick reaches its optimum(compressive strength of 60 MPa,flexural strength of 1.3 MPa,and softening coefficient of about 0.9),far superior to other reported methods for preparing building ***-EDS,Particle size analysis and XRD confirmed that the crystal structure in aluminum ash undergoes a transformation under high-intensity mechanical pressure,forming cement-based active *** study not only obtained a new method for preparing building materials,but also further promoted the research on the resource utilization of aluminum ash,providing a new approach for the treatment and disposal of hazardous waste.

关键词： Aluminum ash Hazardous solid waste Extreme high value Densification Super building materials

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Microbial community structure in different wastewater treatment processes characterized by single-strand conformation polymorphism (SSCP) technique

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Frontiers of Environmental Science & Engineering 2008年第1期2卷 116-121页

作者： Yangguo ZHAO Aijie WANG nanqi ren Yan ZHAO School of Municipal and Environmental Engineering Harbin Institute of TechnologyHarbin 150090China College of Environmental Science and Engineering Ocean University of ChinaQingdao 266100China

In order to investigate microbial community structures in different wastewater treatment processes and understand the relationship between the structures and the status of processes,the microbial community diversity,variety and distribution in five wastewater treatment pro cesses were studied by a culture-independent genetic fingerprinting technique single-strand conformation poly-morphism(SSCP).The five processes included denitrifying and phosphate-removal system(diminished N),Chinese traditional medicine wastewater treatment system(P),beer wastewater treatment system(W),fermentative biohydrogen-producing system(H),and sulfate-reduction system(S).The results indicated that the microbial community profiles in the wastewater bioreactors with the uniform status were very *** diversity of microbial populations was correlated with the complexity of organic contaminants in *** traditional medicine wastewater contained more complex organic components;hence,the population diversity was higher than that of simple nutrient bioreactors fed with molasses *** with the strain bands in a simulated community,the relative proportion of some functional microbial populations in bioreactors was not *** biohydrogen producer Ethanoligenens harbinense in the better condition bioreactor had only a 5% band density,and the Desulfovibrio *** the sulfate-reducing bioreactor had less than 1.5%band *** SSCP profiles could identify the difference in microbial community structures in wastewater treatment processes,monitor some of the functional microbes in these processes,and consequently provide useful guidance for improving their efficiency.

关键词： wastewater treatment process microbial community structure community diversity single-strand conformation polymorphism(SSCP)

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Fermentative hydrogen production from beet sugar factory wastewater treatment in a continuous stirred tank reactor using anaerobic mixed consortia

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Frontiers of Environmental Science & Engineering 2013年第1期7卷 143-150页

作者： Gefu ZHU Chaoxiang LIU Jianzheng LI nanqi ren Lin LIU Xu HUANG Key Laboratory of Urban Environment and Health Institute of Urban Environment Chinese Academy of Sciences Xiamen 361021 China School of Municipal and Environmental Engineering Harbin Institute of Technology Harbin 150090 China

A low pH, ethanol-type fermentation process was evaluated for wastewater treatment and bio-hydrogen production from acidic beet sugar factory wastewater in a continuous stirred tank reactor (CSTR) with an effective volume of 9.6 L by anaerobic mixed cultures in this present study. After inoculating with aerobic activated sludge and operating at organic loading rate (OLR) of 12 kgCOD·m?3·d?1, HRT of 8h, and temperature of 35°C for 28 days, the CSTR achieved stable ethanol-type fermentation. When OLR was further increased to 18 kgCOD·m?3·d?1 on the 53rd day, ethanol-type fermentation dominant microflora was enhanced. The liquid fermentation products, including volatile fatty acids (VFAs) and ethanol, stabilized at 1493 mg·L?1 in the bioreactor. Effluent pH, oxidation-reduction potential (ORP), and alkalinity ranged at 4.1–4.5, ?250-(?290) mV, and 230–260 mgCaCO3·L?1. The specific hydrogen production rate of anaerobic activated sludge was 0.1 L·gMLVSS?1·d?1 and the COD removal efficiency was 45%. The experimental results showed that the CSTR system had good operation stability and microbial activity, which led to high substrate conversion rate and hydrogen production ability.

关键词： fermentative hydrogen production continuous stirred tank reactor (CSTR) specific hydrogen production rate beet sugar factory wastewater ethanol-type fermentation

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