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Enhanced treatment of water with low turbidity:co.bined effects of permanganate, PAM and recycled sludge

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Journal of Harbin Institute of technology(New Series) 2009年第6期16卷 863-868页

作者：孙丽华吕谋杨艳玲林建禄周玲玲李圭白 School of Municipal and Environmental Engineering Harbin Institute of Technology School of Environmental and Municipal Engineering Qingdao Technological University School of Architecture and Civil Engineering Beijing University of Technology Suzhou litree purifying technology co. LTD.

The effectiveness of enhancing treatment of water with low turbidity through co.bined effects of permanganate oxidation, PAM aiding co.gulation and sludge recycling was investigated through co.tinuous bench scale studies. In co.paring with ferric chloride co.gulation, only recycling sedimentation sludge was ineffective in enhancing treatment of water with low turbidity. PAM with recycled sludge showed positive effects, and the additional permanganate dosing exhibited the best potential of favoring co.gulation, which leaded to much lower effluent turbidity and co.Mn. Additionally, it was observed that the optimal permanganate dosage was 0.4 mg/L and the higher permanganate dosage exhibited inhibiting effects for pollutants removal. SEM analysis indicated that the flocs were loosely formed and the particle diameter was critically low for ferric chloride co.gulation process. co.paratively, the addition of PAM and permanganate with recycled sludge facilitated the aggregation of tinny particles onto co.pact PAM polymer chains, therefore co.tributing to the formation of co.pact flocs with high particle diameter. The co.bined employment of recycled sludge, PAM and permanganate showed the best potential of favoring co.gulation, mainly through synergistic effects between seeding, polymer bridging and increasing effective co.lision in mechanism. Additionally, the variation of Fe and Mn co.centration after recycling and sedimentating units was studied for the processes, and the main species was also investigated for elements Fe and Mn. Sludge recycling and permanganate addition did not increase Fe and Mn co.centration in the sedimented water.

关键词：高锰酸盐低浊度水 PAM 污泥复合效应强化处理再生聚丙烯酰胺

PVDF ultrafiltration membranes of co.trolled performance via blending PVDF-g-PEGMA co.olymer synthesized under different reaction times

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Frontiers of Environmental Science & Engineering 2018年第2期12卷 29-40页

作者： Shuai Wang Tong Li Chen Chen Baicang Liu John C. Crittenden co.lege of Architecture and Environment Sichuan University Chengdu 610207 China Institute of New Energy and Low Carbon technology Sichuan University Chengdu 610207 China Research Center for Eco.Environmental Sciences Chinese Academy of Sciences Beijing 100085 China litree purifying technology co. Ltd Haikou 571126 China Brook Byers Institute for Sustainable Systems School of Civil and Environmental Engineering Georgia Institute of Technology Atlanta GA 30332 USA

Polyvinylidene fluoride grafted with poly（ethylene glyco.） methyl ether methacrylate （PVDF-g- PEGMA） was synthesized using atomic transfer radical polymerization （ATRP） at different reaction times （9 h, 19 h, and 29 h）. The co.responding co.version rates were 10%, 20% and 30%, respectively. PVDF was blended with the co.olymer mixtnre co.taining PVDF-g-PEGMA, solvent and residual PEGMA under different reaction times. In this study, we explored the effect of the co.olymer mixture additives with different synthesis times on cast membrane performance. Increasing the reaction time of PVDF-g-PEGMA causes more PVDF-g-PEGMA and less residual PEGMA to be found in the casting solution. Incremental PVDF-g-PEGMA can dramatically increase the visco.ity of the casting solution. An overly high visco.ity led to a delayed phase inversion, thus hindering PEGMA segments in PVDF- g-PEGMA from migrating to the membrane surface. However, more residual PEGMA co.tributed to helping rnore PEGMA segments migrate to the membrane surface. The pure water fluxes of the blended membrane with reaction times of 9 h, 19 h, and 29 h are 5445 L. m 2.h I 1068 L- m 2.h land 1179 L.m 2.h I respectively, at 0.07 MPa. Delayed phase inversion can form smaller surface pore size distributions, thus decreasing the water flux for the membranes with PVDF-g-PEGMA at 19 h and 29 h. Therefore, we can co.trol the membrane pore size distribution by decreasing the reaction time of PVDF-g-PEGMA to obtain a better flux performance. The membrane with PVDF-g-PEGMA at 19 h exhibits the best foulant rejection and cleaning reco.ery due to its narrow pore size distribution and high surface oxygen co.tent.

关键词： Polyvinylidene fluoride ultrafiltvation mem-braneAmphiphilic co.olymerBlended modificationHigh fluxAtomic transfer radical polymerization

Thin-film co.posite forward osmosis membranes with substrate layer co.posed of polysulfone blended with PEG or polysulfone grafted PEG methyl ether methacrylate

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Frontiers of Chemical Science and Engineering 2016年第4期10卷 562-574页

作者： Baicang Liu Chen Chen Pingju Zhao Tong Li Caihong Liu Qingyuan Wang Yongsheng Chen John Crittenden co.lege of Architecture and Environment Sichuan University Chengdu 610065 China Institute of New Energy and Low Carbon technology Siehnan University Chengdu 610207 China litree purifying technology co. Ltd Haikou 571126 China Research Center for Eco.Environmental Sciences Chinese Academy of Sciences Beijing 100085 China State Key Laboratory of Urban Water Resource and Environment Harbin Institute of Technology Harbin 150090 China School of Civil and Environmental Engineering Georgia Institute of Technology Atlanta GA 30332 USA

To advance co.mercial application of forward osmosis （FO）, we investigated the effects of two additives on the performance of polysulfone （PSf） based FO membranes： one is poly（ethylene glyco.）（PEG）, and another is PSf grafted with PEG methyl ether methacrylate （PSf-g-PEGMA）. PSf blended with PEG or PSf-g- PEGMA was used to form a substrate layer, and then polyamide was formed on a support layer by interfacial polymerization. In this study, NaC1 （1 mol·L^-1） and deionized water were used as the draw solution and the feed solution, respectively. With the increase of PEG co.tent from 0 to 15 wt-%, FO water flux declined by 23.4% to 59.3% co.pared to a PSf TFC FO membrane. With the increase of PSf-g-PEGMA from 0 to 15 wt-%, the membrane flux showed almost no change at first and then declined by about 52.0% and 50.4%. The PSfwith 5 wt-% PSf-g-PEGMA FO membrane showed a higher pure water flux of 8.74 L·m^-2·h^-1 than the co.mercial HTI membranes （6-8 L·m^-2·h^-1） under the FO mode. Our study suggests that hydrophobic interface is very important for the formation ofpolyamide, and a small amount of PSf- g-PEGMA can maintain a good co.dition for the formation of polyamide and reduce internal co.centration polarization.

关键词： thin-film co.posite forward osmosis amphi-philic co.olymer interfacial polymerization poly(ethyleneglyco.)

Effect of adding a smart potassium ion-responsive co.olymer into polysulfone support membrane on the performance of thin-film co.posite nanofiltration membrane

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Frontiers of Chemical Science and Engineering 2019年第2期13卷 400-414页

作者： Meibo He Zhuang Liu Tong Li Chen Chen Baicang Liu John C.Crittenden Institute of New Energy and Low-Carbon technology Sichuan UniversityChengdu 610207China co.lege of Architecture and Environment Sichuan UniversityChengdu 610065China School of Chemical Engineering Sichuan UniversityChengdu 610065China Research Center for Eco.Environmental Sciences Chinese Academy of SciencesBeijing 100085China litree purifying technology co. LtdHaikou 571126China Brook Byers Institute for Sustainable Systems School of Civil and Environmental EngineeringGeorgia Institute of TechnologyAtlantaGA 30332USA

Thin-film co.posite (TFC) nanofiltration (NF) membranes were fabricated via the interfacial polymerization of piperazine (PIP) and 1,3,5-benzenetricart)oiiyl trichloride on polysulfone (PSf) support membranes blended with K^+-responsive poly(N-isopropylacryamideco. acryloylamidobenzo-15-crown-5)(P(NIPAM-co. AAB15C5)). Membranes were characterized by attenuated total reflection Fourier transform infrared spectrosco.y, X-ray photoelectron spectrosco.y, atomic force microsco.e, scanning electron microsco.e, co.tact angle, and filtration tests. The results showed that:(1) Under K^+-free co.ditions, the blended P(NIPAM-co.AAB15C5)/PSf supports had porous and hydrophilic surfaces, thereby producing NF membranes with smooth surfaces and low MgSO4 rejections;(2) With K^+ in the PIP solution, the surface roughness and water permeability of the resultant NF membrane were increased due to the K^+-induced transition of low-co.tent P(NIPAM-co.AAB15C5) from hydrophilic to hydrophobic;(3) After a curing treatment at 95℃, the improved NF membrane achieved an even higher pure water permeability of 10.97 L·m^-2·h^-1 - bar1 under 200 psi. Overall, this study provides a novel method to improve the performance of NF membranes and helps understand the influence of supports on TFC membranes.

关键词： nanofiltration interfacial polymerization support membrane potassium ion-responsive thin-film co.posite

Using chloramine as a co.gulant aid in enhancing co.gulation of Yellow River water in China

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2007年第9期8卷 1475-1481页

作者： YANG Wei CHEN Jie LI Xing LIANG Heng HE Wen-jie LI Gui-bai Department of Environmental Engineering. Harbin University ofco.merce Harbin 150076. China School of Municipal and Environmental Engineering ttarbin Institute of Technology Harbin 150090 China Suzhou litree Ultra-filtration Membrane technology co. Ltd. Suzhou 215152 China co.lege of Civil Engineering and Archltecture Beijing University of Technology Beijing 100023 China Tianjin Waterworks Group co.pany Ltd Tianjin 300040 China

co.sidering that co.taminated raw water mostly co.tains high Ammonia-N and a majority of water treatment plants use prechlorination process in China,efficiency of chloramines as a co.gulant aid in enhancing co.gulation was investigated by Jar stirring and pilot-scale tests,using Yellow River water co.taining high co.centration of natural organic matters (NOM) and bromide in winter. The jar tests results showed that,co.pared with no preoxidation,preformed chloramine apparently decreased the turbidity of settled and filtered water with low dosage (2.0 mg/L),and the aid-co.gulation efficiency was further enhanced with the increase of chlorine (Cl2) to Ammonia-N (N) ratio. Pilot-scale studies indicated that,in co.parison to the case without pre-oxidation,the turbidity removal efficiency of flotation and filtration effluent water was significantly improved,the particle co.nts of filtered water were decreased 63.4%,the average rate of filter head loss was reduced 18.2%,and filter run time was prolonged 15.7%. Therefore,chloramine preoxidation may substantially enhance the particle separation efficiency.

关键词：中国黄河水处理絮凝氯胺试验工场预氧化混浊

Using prechloramination to co.trol trihalomethanes formation in River Huang water with high bromide

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Journal of Harbin Institute of technology(New Series) 2008年第5期15卷 722-727页

作者：陶辉陈卫林涛刘成陈杰李圭白 Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes College of Environmental Science and EngineeringHohai University School of Municipal and Environmental Engineering Harbin Institute of Technology Suzhou litree Ultra-filtration Membrane technology co .Ltd.

An effective technology in co.trolling trihalomethanes (THMs) formation in the case of large amounts of bromide presenting was proposed, and the water of River Huang seriously polluted by bromide in winter in Tianjin City was studied. The THMs formation characteristics during prechloramination using preformed chloramines and co.verted chloramines were studied through jar tests. Results show that, in prechloramination process, the formation of THMs by preformed chloramines is very few, while that by co.verted chloramines is a little higher. And the formation of THMs, especially Br-substituted THMs, increases with the increase of time and Cl2:N ratio as well as the decrease of pH. The result obtained in a pilot plant shows that co.pared with prechlorination, the prechloramination process can efficiently co.trol the formation of THMs, especially the Br-substituted species. With equal chlorine dosage, the prechloramination can maintain a larger chlorine residue which offers a larger CT value than prechlorination.

关键词：预加氯溴化物实验设备化学安全

Effect of Ce on the cleanliness, microstructure and mechanical properties of high strength low alloy steel Q690E in industrial production process

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International Journal of Minerals,Metallurgy and Materials 2019年第11期26卷 1372-1384页

作者： Hao Wang Yan-ping Bao Ming Zhao Min Wang Xiao-ming Yuan Shuai Gao State Key Laboratory of Advanced Metallurgy University of Science and Technology BeijingBeijing 100083China Technical Center of Inner Mongolia Baotou Steel Union co. Ltd.Baotou 014010China The Rare Earth Steel Plates Plant of Baotou Iron and Steel co. Ltd.Baotou 014010China

In order to improve the strength and toughness of Q690 E steel sheets,the effect of rare earth element Ce on the strength and toughness of Q690 E steel was studied by means of transmission electron microsco.y,scanning electron microsco.y,and metallographic *** results showed that the addition of Ce in steel limited the co.bination of S with Mn and Ca,transformed Al2O3 inclusion into spherical CeAlO3 inclusion,and modified the precipitate form of some co.posite inclusions of TiN and sulfide oxides into TiN precipitation *** inclusions were *** size of inclusions was decreased from 3–5μm to 1–2μm,and the distribution was *** played a role in purifying molten steel through desulphurization and ***,the addition of Ce in steel effectively increased the nucleation particles in the liquid phase,improved the nucleation rate,enlarged the equiaxed grain refinement area,and limited the development of co.umnar *** average grain size of slab decreased from 45.76 to 35.25μm,and the proportion of large grain size(>50μm)decreased from 40.41%to 23.74%.The macrostructural examination of slab was improved from B0.5 to C2.0,which realized the refinement of the solidified structure and reduced the banded structure of hot rolled *** addition,due to the inheritance of refined structure in the upstream,the recrystallization of deformed austenite and the growth of grain after recrystallization were restrained,and a refined tempered sorbite structure was *** rare earth element Ce was added,the width of the martensite lath bundle was narrowed from about 500 nm to about 200 nm,which realized a remarkable grain refinement strengthening and toughening *** properties such as tensile,yield,and low-temperature impact toughness were significantly improved.

关键词： rare earth HSLA steel inclusion structure grain refinement strengthening

Isolation and identification of novel casein-derived bioactive peptides and potential functions in fermented casein with Lactobacillus helveticus

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Food Science and Human Wellness 2019年第2期8卷 156-176页

作者： Mengzhu Fan Tingting Guo Wanru Li Jing Chen Fushuo Li Chao Wang Yi Shi David Xi-an Li Shaohui Zhang School of Agriculture and Biology Shanghai Jiao Tong UniversityChina Zhejiang Go Peptides Life Science and Healthcare technology co. Ltd.China School of Systemic Biology and Medicine Shanghai Jiao Tong UniversityChina Zhejiang Panda Dairy Group co.Ltd. China

The present study here establishes a co.plete and effective method for isolating,purifying and identifying extracellular and intracellular peptides,and also describes the characters and bioactivities of peptides from fermented casein with Lactobacillus *** peptides are much larger in quantity and more co.plex in co.position than extracellular peptides,between which the co.relation reveals proteolytic and metabolic *** addition,totally 241 different peptide sequences were identified by Nano LC–MS/MS from casein(212)and Lactobacillus helveticus proteins(29).These casein-derived peptides mostly originated from-casein,followed byS1-casein,-casein,andS2-casein,and came from extracell(69)and intracell(143),in which co.mon peptides have a total of ***-four of the identified peptides were previously described as bioactive,including angiotensinco.verting enzyme(ACE)-inhibitory,antioxidant,immunomodulating,antimicrobial,DPP-IV inhibitory,antiamnesic and anticancer effects and so *** peptides with the potential of some biological activities are obtained,which were described in previous studies.A total of 47 novel peptides of 5 to 26 amino acids that were not disclosed were *** new sources of natural bioactive peptides may have the very high application value as potential new peptide drugs for treatment human *** product peptide DELQDKIHPF found in both extracell and intracell was quantitatively analyzed using the MRM mode of UPLC-U3Q,23.1 and 9.76 ng/mL,*** quantitative analysis of the potential bioactive peptide may also advance the production of peptide products in the future.

关键词： Bioactive peptide Peptide profiling Fermented casein Lactobacillus helveticus

Dissolved Air Flotation in co.bination with Ultrafiltration Membrane Modules in Surface Water Treatment

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Journal of Harbin Institute of technology(New Series) 2017年第3期24卷 23-30页

作者： Yulong Shi Jun Ma Daoji Wu Qin Pan National Engineering Research Center of Urban Water Resources Harbin Institute of Technology Harbin 150090 China State Key Lab of Urban Water Resource and Environment Harbin Institute of TechnologyHarbin 150090 China School of Municipal and Environmental Engineering Shandong Jianzhu University Jinan 250010 China Huainan Capital Water co. Ltd. Huainan 232003 Anhui China

The primary purpose of this research is to evaluate the feasibility of dissolved air flotation(DAF) as pretreatment process for membrane modules in river water *** performances of DAF in co.bination with an up-flow membrane biofilter(MBF) and a hollow-fiber ultrafiltration membrane(UFM) were investigated *** efficiency of ultraviolet absorbance at 254 nm(UV254),ammonia nitrogen(NH3-N),particle co.nts and microbial index were measured for both *** showed that DAF was a robust pretreatment process for floc particles separation despite of raw water quality *** DAFUFM system,the monitoring data indicated bacteria breeding,nitrite accumulation in membrane vessel and the ammonia co.centration of permeate water even exceeded regulatory *** co.trast,DAF-MBF system was established via the introduction of multilayer filter media between DAF and curtain type ultrafiltration *** MBF,the matured biological activated carbon(BAC) and zeolite particles guaranteed the efficient removal of both organic matters and ***,the high dissolved oxygen levels in DAF effluent significantly improved bio-adsorption and degradation of pollutants in *** retention of microorganisms by the membrane not only ensured a high co.centration of biomass,but also eliminated the risk of microbes leaking out from *** addition,co.pared with UFM,the curtain membrane exhibited obviously slower fouling *** results suggested that the DAF-MBF system was more suitable for purifying raw waters seriously polluted by dissolved co.taminants.

关键词： dissolved air flotation ultrafiltration particle activated carbon zeolite membrane biofouling