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Characterization of CANON reactor performance and microbial community shifts with elevated COD/N ratios under a continuous aeration mode

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Frontiers of Environmental Science & Engineering 2019年第1期13卷 73-85页

作者： Yao Zhang Yayi Wang Yuan Yan Haicheng Han Min Wu State Key Laboratory of Pollution Control and Resources Reuse Shanghai Institute of Pollution Control and Ecological Security College of Environmental Science and Engineering Tongji University Shanghai 200092 China

The effects of increasing COD/N on nitrogen removal performance and microbial structure were investigated in a SBR adopting a completely autotrophic nitrogen removal over nitrite process with a continuous aeration mode (DO at approximately 0.15-0.2 mg/L). As the COD/N increased from 0.1 to W0.59, the nitrogen removal efficiency QMRE) increased from 88.7% to 95.5%;while at COD/N ratios of 0.59-0.82, the NRE remained at 90.7%-95.5%. As the COD/N increased from 0.82 to 1.07, the NRE decreased continuously until reaching 60.1%. Nitrosomonas sp.(AOB) and Candidatus Jet tenia (anammox bacteria) were the main functional genera in the SBR. As the COD/N increased from 0.10 to 1.07, the relative abundance of Nitrosomonas decreased from 13.4% to 2.0%, while that of Candidatus Jettenia decreased from 35% to 9.9% with COD/N < 0.82 then increased to 45.4% at a COD/N of 1.07. Aerobic heterotrophic bacteria outcompeted AOB at high COD loadings (650 mg/L) because of oxygen competition, which ultimately led to deteriorated nitrogen removal pertormance.

关键词： CANON process COD/N ratio Anammox Ammonia oxidizing bacteria Aerobic heterotrophic bacteria

Effect of oxidization on enrichment behavior of TiO_2 in titanium-bearing slag

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Rare Metals 2006年第2期25卷 106-110页

作者： WANG Mingyu LI Liaosha ZHANG Li ZHANG Linnan TU Ganfeng SUI Zhitong School of Metallurgy Science and Engineering Central South University Changsha 410083 China Key Laboratory of Metallurgy Engineering and Resources Recycling Anhui University of Technology Maanshan 243002 China School of Materials and Metallurgy Northeastern University Shenyang 110004 China

Due to the dispersed distribution of the titanium component in various mineral phases and very fine grain size, it is difficult to recover the titanium component from the slag. In order to utilize titanium resources, selective enriching and selective growing of the titanium component from the molten slag is expected. In this paper, the selection of the best titanium enrichment phase and the effect of oxidization on the enrichment of titanium by blowing air into the molten slag were studied. The results showed that through oxidizing the slag, the content of the perovskite phase increases while that of the other titanium-bearing mineral phases decreases until they disappear. Most titania resources were enriched into the perovskite phase and increase in size. The process of enrichment and growth is easily carried out.

关键词： oxidizing perovskite phase transformation enrichment titanium-bearing slag

Automatic Detection Instrument for the Ratio of Chlorine to Bromine in Oxidized Liquid of Bromine Production Based on Fuzzy Method

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仪器仪表学报 2006年第Z1期27卷 159-161页

作者： Yu Naigong Wang Kaiyan Beijing Polytechnic University Beijing 100022 China Wei Fang University Shandong 261041 China

In the process of bromine production,because of lag adjustment methods,there are problems of adjusting delay,raw material wastage and low growth rate.By considering the nature of bromine production,with the help of fuzzy data processing method,computer detection and display technique,we designed an automatic detection instrument for the ratio of chlorine to bromine in oxidized liquid of bromine production.This instrument can be used to detect the different parameters of raw materials adjustment and control in real time,and afford assurance that raw materials will be adjusted in time.This paper briefly introduces the working mechanism,hardware and software design of the instrument.

关键词： bromine production fuzzy relation list ratio of chlorine to bromine in oxidized liquid oxidizing electric potential automatic detection

Experimental and mechanism studies on simultaneous desulfurization and denitrification from flue gas using a flue gas circulating fluidized bed

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Science China Chemistry 2007年第1期50卷 135-144页

作者： ZHAO Yi XU PeiYao SUN XiaoJun WANG LiDong School of Environmental Science&Engineering North China Electric Power UniversityBaoding 071003China

The oxidizing highly reactive absorbent was prepared from fly ash,industry lime,and an oxidizing additive M.Experiments of simultaneous desulfurization and denitrification were carried out in a flue gas circulating fluidized bed(CFB).The effects of influencing factors and calcium availability were also investigated on the removal efficiencies of desulfurization and denitrification.Removal efficiencies of 95.5%for SO2 and 64.8%for NO were obtained respectively under the optimal experimental conditions. The component of the spent absorbent was analyzed with chemical analysis methods.The results in- dicated that more nitrogen species appeared in the spent absorbent except sulfur species.A scanning electron microscope(SEM)and an accessory X-ray energy spectrometer were used to observe micro-properties of the samples,including fly ash,oxidizing highly reactive absorbent and spent absorbent.The simultaneous removal mechanism of SO2 and NO based on this absorbent was pro- posed according to the experimental results.

关键词： flue gas circulating fluidized bed simultaneous desulfurization and denitrification oxidizing highly reactive absorbent mechanism

High Temperature Corrosion of Fe-25Cr and Fe-17Cr-1.5Si-0.5Al Alloys in oxidizing and Sulfidizing Enviornments

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工程科学学报 1989年第6期 604-610页

作者：王才荣公茂秀张文奇朱日彰

The simultaneous oxidation and sulfidation of Fe 25Cr and Fe-17Cr-l.5Si-0.5Al alloys was studied at 1023K and 1223K in H2-H2O-H2S gas mixtures. The kinetic boundary which indicates the transition from oxide to sulfide has heen found in these two alloys. The critical oxygen partial pressures of Fel7Crl.5SiO.5Al alloys were systematically lower than those of Fe-25Cr alloy. The reaction kinetics were measured by the stainless steel spring balance, and the reaction products were characterized by X-ray diffraction and scanning electron microscopy. The reaction rate usually decreased with the increase of the oxygen partial pressure at the constant sulfur partial pressure. The exista-nce of silicon plays an important role to suppress the sulfidation of Fel7Cr alloy.

关键词： high temperature corrosion Fe-Cr alloy oxidizing sulfidizing

Chemical-mechanically polishing large area free-standing CVD diamond films

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金刚石与磨料磨具工程 2018年第6期38卷 69-72页

作者： ZHANG Pingwei TONG Tingting CAI Yunhong Hebei Plasma Diamond Technology Co. Ltd. Shijiazhuang 050000 China Hebei Institute of Laser Shijiazhuang 050000 China

Chemical mechanical polishing is used to polish large area free-standing CVD diamond films with diameters of 66 mm.The influence of polishing plates(iron plate,asphalt plate and soft cushion)and oxidizing agents(K_2S_2O_8 and K_2FeO_4)on polishing results are investigated.Profilometer(tip radius 5μm),optical microscope and Raman spectroscopy are used to evaluate the polishing effects of the CVD diamond films.Results show that the material removal rate of iron plate is the highest,while the surface polished by soft cushion is the most uniform with roughness of 2nm.It is also found that the most effective oxidizing agent is K_2FeO_4.In conclusion,the optimum polishing conditions are soft cushion and K_2FeO_4.

关键词： polishing plate oxidizing agent material removal rate surface roughness

The Influence of associations of hydrocarbon oxidizing microorganisms to the microbial cenosis and oil destruction in soil

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Natural Science 2012年第10期4卷 784-788页

作者： Svetlana A. Aitkeldieva Elmira R. Faizulina Askar A. Kurmanbaev Olga N. Auezova Zhanat А. Baigonusova Larisa G. Tatarkina Tatiana Sh. Zaitova Amankeldy K. Sadanov Institute of Microbiology and Virology Almaty Republic of Kazakhstan Institute of Microbiology and Virology Almaty Republic of Kazakhstan

Mesocosms experiments were used to study the influence of associations of hydrocarbon oxidizing microorganisms on the microbial cenosis and oil destruction in soil. The introduction of active oil oxidizing microorganisms associations into the soil purify of soil from oil to 59.8% - 63.8% after 2 months with 5% oil content and with 10% to 49.2% - 55.6%. As a result of oil destruction there was enlarging of the number of all investigated groups of microorganisms.

关键词： Oil oxidizing Microorganisms Bioremediation Associations of Hydrocarbon oxidizing Microorganisms Oil Polluted Soils

CATALYTIC OXIDATION ACTIVITIES OVER HIGH T_C SUPERCONDUCTING OXIDES

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Chinese Science Bulletin 1991年第12期36卷 984-987页

作者：侯碧辉俞寿明金大胜林培琰陈兆甲王克勤李如康许勤论王玉霞 Department of Physics University of Science and Technology of China Hefei 230026 PRC Department of Modem ChemistryUniversity of Science and Technology of China Hefei 230026 PRC Department of PhysicsUniversity of Science and Technology of China Hefei 230026 PRC Department of Applied Chemistry University of Science and Technology of China Hefei 230026 PRC Department of Material Science University of Science and Technology of China Hefei 230026 PRC

No sooner had the high T_c superconducting oxides been discovered than the wide interest was exhibited in the research of the electronic structure and ionic valence state of these kinds of materials. Based on theoretic calculations and experimental results of the X-ray photoelectron spectroscopy (XPS)and the electron-energy-loss spectroscopy (EELS), it

关键词： high T_c superconducting oxide catalysis oxidizing activity.

Subject Index to 2006

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Chinese Journal of Chemical Engineering 2006年第6X期14卷 847-856页