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acid resistance of methanogenic bacteria in a two-stage anaerobic process treating high concentration methanol wastewater

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Frontiers of Environmental Science & Engineering 2007年第1期1卷 53-56页

作者： ZHOU Xuefei REN Nanqi State Key Laboratory of Pollution Control and Resource Reuse Tongji UniversityShanghai 200092China Department of Environmental Science and Engineering Harbin Institute of TechnologyHarbin 150090China

In this study,the two-stage upflow anaerobic sludge blanket(UASB)system and batch experiments were employed to evaluate the performance of anaerobic digestion for the treatment of high concentration methanol *** acid resistance of granular sludge and methanogenic bacteria and their metabolizing activity were *** results show that the pH of the first UASB changed from 4.9 to 5.8 and 5.5 to 6.2 for the second ***,these were not the advisable pH levels that common metha-nogenic bacteria could *** methanogenic bacteria of the system,*** barkeri,had some acid resis-tance and could still degrade methanol at pH *** the meth-anogenic bacteria were trained further,their acid resistance would be improved *** sludge of the system could protect the methanogenic bacteria within its body against the impact of the acidic environment and make them degrade methanol at pH *** performance of granular sludge was attributed to its structure,bacteria species,and the distribution of bacterium inside the granule.

关键词： methanol wastewater methanogenic bacteria acid resistance granular sludge upflow anaerobic sludge blanket(UASB) batch culture experiment

Industrial Preparation and acid resistance of Ultra-stable Y Zeolite with Small Cell Size Produced by Gas-phase Method

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China Petroleum Processing & Petrochemical Technology 2022年第2期24卷 85-90页

作者： Zhang Jing Jia Jishun Sha Hao Lu Guanqun Yan Jiasong Wang Shengji Zhou Lingping SINOPEC Catalyst Co. Ltd.Qilu BranchZibo 255336 SINOPEC Research Institute of Petroleum Processing Beijing 100083

Small-cell HSY-S zeolite prepared by the gas-phase ultra-stable method had been researched and developed,and industrial preparation tests of HSY-S have been successfully carried out for the first *** acid resistance of industrially prepared HSY-S was investigated by acid solutions with different pH *** structures and properties of HSY-S and its acid-treated samples were characterized by XRD,XRF,BET,and *** show that the HSY-S samples have the characteristics of high crystallinity,good stability,large specific surface area,and good acid resistance.

关键词： zeolite small unit cell size gas-phase ultra-stable acid resistance industrial preparation

Performance evaluation of nano-silica and silica fume on enhancing acid resistance of cement-based composites for underground structures

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Journal of Central South University 2020年第12期27卷 3821-3838页

作者： WU Lin-ping HUANG Guang-ping LIU Wei Victor Department of Civil and Environmental Engineering University of AlbertaEdmontonAlberta T6G 2E3Canada

This study aims to evaluate the performance of silica fume(SF)and nano-silica(NS)on enhancing the sulfuric acid resistance of mortar *** NS and SF were added as substitutions for cement at various *** cured samples were immersed in the sulfuric acid solution with a pH of 2 for 75 d.A compressive strength test and absorption and voids tests were conducted before sulfuric acid *** was found that the addition of SF and NS reduced the volume of permeable voids and increased compressive strength.A thermo-gravimetric analysis was carried out to investigate the hydration of *** mixtures with SF showed a higher level of pozzolanic reaction compared with mixtures with *** the 75 d of immersion,the mixtures with 5%SF and 1%NS showed the best resistance against sulfuric acid because they showed the lowest mass change and length change.

关键词： acid resistance nano-silica silica fume mortar

Effects of Soil acidification on Yield of Late Rice and Differences in acid resistance among Varieties

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Agricultural Science & Technology 2015年第5期16卷 980-982,987页

作者：袁珍贵陈平平唐琨郭莉莉朱伟文王元元杨晶易镇邪湖南农业大学农学院湖南长沙410128

Effect of soil acidification on yield of late rice was studied and acid resistance of late rice varieties were compared with 23 late rice varieties as materials in Changsha County, Hunan Province. The results indicated that the difference in yield among varieties was obvious, yield in common field was among 5 226.6-9 202.1kg/hm^2, and yield in acidified field was among 3 643.2-7 714. 8 kg/hm^2. Compared with common field, yield of Yueyou 6135, Huayou 18, Jinyou 284 and Ⅱyou 46 increased by 3.24%-26.33% in acidified field, while yield of other varieties decreased by 2.04%-56.79% in acidified field. According to acidification sensitivity, Wufengyou T025, Jinchuyou No.148, Yueyou No.6135, Shenyou No.9586, Xiangfengyou No.103,Zhongyou No.288, Nongxiang No.18, Shanyou No.432, Ⅱ you No.6, and Zhong 9A/R10402 were sensitive to soil acidification; Wuyou No.308, Zhunliangyou No.608,Fengyuanyou No.227, Fengyou No.1167, Fengyuanyou No.299, T you No.272, and Zhong 9A/R9963 were moderately sensitive to soil acidification; Yueyou No.9113,Jinyou No.284, Shenyou No.9588, Huayou No.18, Ⅱ you No.46 and Ⅱ you No.3027 were slightly sensitive to soil acidification

关键词： Late rice Soil acidification Yield acid resistance

Performance and enhanced oil recovery efficiency of an acid-resistant polymer microspheres of anti-CO_(2) channeling in low-permeability reservoirs

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Petroleum Science 2024年第4期21卷 2420-2432页

作者： Hai-Zhuang Jiang Hong-Bin Yang Ruo-Sheng Pan Zhen-Yu Ren Wan-Li Kang Jun-Yi Zhang Shi-Long Pan Bauyrzhan Sarsenbekuly State Key Laboratory of Deep Oil and Gas China University of Petroleum(East China)Qingdao266580ShandongPR China Oil and Gas Engineering Research Institute CNPC Jilin Oilfield CompanySongyuan138000JilinPR China School of Petroleum Engineering China University of Petroleum(East China)Qingdao266580ShandongPR China School of Energy and Petroleum Industry Kazakh-British Technical UniversityAlmaty050000Kazakhstan

CO_(2) flooding is a vital development method for enhanced oil recovery in low-permeability reservoirs,However,micro-fractures are developed in low-permeability reservoirs,which are essential oil flow channels but can also cause severe CO_(2) gas channeling ***,anti-gas channeling is a necessary measure to improve the effect of CO_(2) *** kind of anti-gas channeling refers to the plugging of fractures in the deep formation to prevent CO_(2) gas channeling,which is different from the wellbore *** microspheres have the characteristics of controllable deep plugging,which can achieve the profile control of low-permeability fractured *** acidic environments with supercritical CO_(2),traditional polymer microspheres have poor expandability and plugging *** on previous work,a systematic evaluation of the expansion performance,dispersion rheological properties,stability,deep migration,anti-CO_(2) channeling and enhanced oil recovery ability of a novel acid-resistant polymer microsphere(DCNPM-A)was carried out under CQ oilifield conditions(salinity of85,000 mg/L,80℃,pH=3).The results show that the DCNPM-A microsphere had a better expansion performance than the traditional microsphere,with a swelling rate of *** microsphere dispersion with a concentration of 0.1%-0.5%had the advantages of low viscosity,high dispersion and good injectability in the low permeability fractured *** the acidic environment of supercritical CO_(2),DCNPM-A microspheres showed excellent stability and could maintain strength for over 60 d with less *** core experiments,DCNPM-A microspheres exhibited delayed swelling characteristics and could effectively plug deep *** a plugging rate of 95%,the subsequent enhanced oil recovery of CO_(2) flooding could reach 21.03%.The experimental results can provide a theoretical basis for anti-CO_(2)channeling and enhanced oil recovery in low-permeability fractured reservoirs.

关键词： Low-permeability reservoir Anti-CO_(2)channeling Polymer microsphere acid resistance

Fabrication of high-performance pervaporation composite membrane for alkaline wastewater reclamation

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Frontiers of Chemical Science and Engineering 2022年第5期16卷 709-719页

作者： Guiqin Bai Jianzhong Xia Bing Cao Rui Zhang Junquan Meng Pei Li College of Materials Science and Engineering Beijing University of Chemical TechnologyBeijing 100029China Institute for Advance Study Shenzhen UniversityShenzhen 518060China

Pervaporation desalination has a unique advantage to recycle concentrated salt *** merit can be applied to treat alkaline wastewater if the membrane has superior *** this paper,we used polyethylene microfiltration membrane as the substrate and deposited a glutaraldehyde crosslinked sodium carboxymethylcellulose layer by *** flux of the composite membrane reached 352 kg·m^(-2)·h^(-1) with a sodium chloride rejection of 99.9%0.1%when separating a 3.5 wt-%sodium chloride solution at 70℃.The desalination performance was stable after soaking the membrane in a 20 wt-%NaOH solution at room temperature for 9 d and in a 10 wt-%NaOH solution at 60℃ for 80 ***,the membrane was stable in 4 wt-%sulfuric acid and a 500 mg·L^(-1) sodium hypochlorite *** a process of concentrating a NaOH solution from 5 to 10 wt-%at 60℃,an average water flux of 23 kg·m^(-2)·h^(-1) with a NaOH rejection over 99.98%was obtained.

关键词： pervaporation alkaline solution concentration polyethylene membrane acid resistance chlorine tolerance

Magnetic KIT-6 nano-composite and its amino derivatives as convenient adsorbent for U(Ⅵ)sequestration

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Frontiers of Chemical Science and Engineering 2023年第12期17卷 2037-2049页

作者： Jiafeng Ouyang Wenlu Guo Lin Wang Changming Nie Dadong Shao Weiqun Shi Liyong Yuan School of Environmental and Biological Engineering Nanjing University of Science and TechnologyNanjing 210094China Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049China School of Chemistry and Chemical Engineering University of South ChinaHengyang 421001China

Although mesoporous silica with magnetically hybridized two-dimensional channel structures has been well studied in recent years,it remains a challenge to fabricate the counterpart with macroporous three-dimensional cubic structures since the highly acidic preparation conditions lead to dissolution of magnetic ***,we successfully prepared magnetic KIT-6 nano-composite and its amino derivatives by bearing acid-resistant iron *** prepared materials exhibited excellent properties for U(VI)ions removal from aqueous solutions under various *** experimental data show that the U(VI)adsorption features fast adsorption kinetics,high adsorption capacity and ideal selectivity toward U(VI).The adsorption process is of spontaneous and endothermic nature and ionic strength independence,and the adsorbents can be easily regenerated by acid *** to pristine KIT-6,the introduction of magnetism does not reduce the efficiency of the material to remove U(VI)while exerting its role as a recovery *** findings of this work further demonstrate the potential broad application prospects of magnetic hybrid mesoporous silica in radionuclide chelation.

关键词： magnetic nanoparticle 3D mesoporous silica amino functionalization adsorption of U(VI) acid resistance

acid-Stable CoWO_(4)/WO_(3)-Microrod Coated by a Thin Carbon-Layer as Efficient Pt Co-Catalysts for Methanol Oxidation and Oxygen Reduction

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Chinese Journal of Structural Chemistry 2022年第7期41卷 59-67页

作者： Jiahuan Li Jiahao Xie Xinyu Wang Ying Dai Xiaoqin Xu Jin Liu Zhuang Cai Xin Meng Jinlong Zou Key Laboratory of Functional Inorganic Material Chemistry Ministry of Education of the People's Republic of ChinaSchool of Chemistry and Materials ScienceHeilongjiang UniversityHarbin 150080China School of Civil Engineering Heilongjiang Institute of TechnologyHarbin 150050China

Insufficient activity and instability(poisoning)of Pt-based electrocatalysts for methanol oxidation and oxygen reduction reactions(MOR/ORR)impede the development of direct methanol fuel ***,CoWO_(4) nanoparticles-loaded WO_(3) microrods coated by a thin carbon-layer are used as Pt-supports/co-catalysts for MOR/***_(3) grows along the(110)crystal plane to form microrod(diameter of~0.6 um),which is coated by a carbon-layer(~5 nm).Pt-CoWO_(4)/WO_(3)@NCL-mr(850℃)shows a higher mass activity(2208 mA mg^(-1)_(pt))than the commercial Pt/C(659.4 mA mg^(-1)_(pt)).CoWO_(4)/WO_(3) heterojunction on the microrod surface with abundant oxygen vacancies allows the generation of surface-adsorbed hydroxyl to facilitate CO elimination and regeneration of the occupied Pt active-sites(promising stability).PtCo WO_(4)/WO_(3)@NCL-mr(850℃)has higher half-wave(0.46 V)and onset(0.54 V)potentials than Pt/C(0.41 and 0.50 V)for *** microrod structure of Co WO_(4)/WO_(3)@NCL facilitates the dispersibility of Pt NPs to increase the utilization of Pt active sites and relieve the self-aggregation of Pt to obtain a promising synergy between Pt and CoWO_(4)(Co^(2+))for ORR in acid *** study provides insights not only into the synthesis of acid-resistant WO_(3)@NCL microrod as active Pt co-catalyst,but also into the effective utilization of surface oxygen vacancies and Co^(2+) for MOR/ORR.

关键词： acid resistance methanol-tolerance oxygen vacancies strong metal-support interaction thin carbon-layer

Influence of Block Copolymer on Formation and acid Resistant Properties of Hybrid CaCO_3 Particles

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Chemical Research in Chinese Universities 2009年第1期25卷 112-115页

作者： LI Xiao-dong HU Qiao-ling ZHAO Shi-fang SHEN Jia-cong Affiliated Stomatology Hospital Zhejiang University College of Medicine Hangzhou 310058 P. R. China Institute of Polymer Composite Zhejiang University Hangzhou 310027 P. R. China

Block copolymer polystyrene-b-poly（acrylic acid）（PS-b-PAA） was used as structural template for the synthesis of CaCO3 microparticles. Through this procedure, acid resistant hybrid CaCO3 micro- spheres were obtained. acid resistant properties of this type of hybrid CaCO3 were studied. Size measurement shows that the acid resistant properties of the hybrid particles are different in different solutions, such as HCl, EDTA, and H2SO4 solutions.

关键词： Amphiphilic block copolymer Hybrid particle Size control acid resistance