Publications (11)11.16 Total impact
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Article: [Biodegradation and adsorption of bio-zeolite on pyridine and quinoline].
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ABSTRACT: The study was to explore the treatment of pyridine, quinoline and their transformation product, NH(4+) -N, by the biodegradation and adsorption of a natural and a modified bio-zeolites. The experiment results demonstrated that the mixed bacteria on the bio-zeolites, a pyridine-degrading bacterium and a quinoline-degrading bacterium, could degrade pyridine and quinoline simultaneously. The NH(4+) -N transformed from pyridine and quinoline could be adsorbed by the natural and modified zeolites. The adsorption capacity of the modified zeolite was lower than that of the natural zeolite. However, more microorganisms could attach on the surface of the modified zeolite, so the application of the modified bio-zeolite has a better prospect in actual treatment of pyridine and/ or quinoline pollution.Huan jing ke xue= Huanjing kexue / [bian ji, Zhongguo ke xue yuan huan jing ke xue wei yuan hui "Huan jing ke xue" bian ji wei yuan hui.] 09/2010; 31(9):2143-7. -
Article: [Study on the function of plasmid in pyridine-degrading bacteria].
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ABSTRACT: In order to identify the characteristics of the plasmids of degrading bacterial strains and the relationship between the plasmids' function and biodegradation, plasmids were isolated from two bacterial strains (Paracoccus sp. BW001 and Shinella zoogloeoides BC026) and pulse-field gel electrophoresis was used to identify the distribution of plasmids and their molecular size. Two large plasmids with 190-245 kb and one small plasmid with 4.5-5.0 kb were found in the BW001, and at least 3 large plasmids over 200 kb were harbored in the BC026. The plasmid curing was conducted by high temperature-SDS method and the results indicated the biodegradation genes might locate in the plasmids of two bacterial strains. After transforming the plasmids of BW001 into E. coli 5alpha by electroporation, the new bacterial strain could tolerate pyridine.Huan jing ke xue= Huanjing kexue / [bian ji, Zhongguo ke xue yuan huan jing ke xue wei yuan hui "Huan jing ke xue" bian ji wei yuan hui.] 07/2010; 31(7):1679-83. -
Article: [Isolation, identification, and biodegradation characteristics of a quinoline-degrading bacterium].
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ABSTRACT: A bacterial strain BW003, which could utilize quinoline as sole carbon, nitrogen and energy source, was isolated from the activated sludge in a coking wastewater treatment plant. According to the 16S rRNA gene sequence analysis, the strain was identified as Pseudomonas sp. Biodegradation experiments showed that the strain could degrade 192-911 mg/L of quinoline efficiently within 3-8 h, and the removal rates of quinoline were ranged from 96% to 98%. The optimum conditions for the degradation were 30 degrees C and pH 8. Metabolic products analysis revealed that at least 43% quinoline was first transformed into 2-hydroxyquinoline, 0.69% 2-hydroxyquinoline was then transformed into 2,8-dihydroxyquinoline, and subsequently into 8-hydroxycoumarin in the process of biodegradation. Additionally, at least 48% of nitrogen in quinoline was transformed into NH3-N directly and external carbon source could promote the nitrogen transformation, demonstrating that the quinoline and its metabolic products could be eliminated if controlling proper C/N ratio.Huan jing ke xue= Huanjing kexue / [bian ji, Zhongguo ke xue yuan huan jing ke xue wei yuan hui "Huan jing ke xue" bian ji wei yuan hui.] 01/2009; 29(12):3546-53. -
Article: [Biodegradation of pyridine by Shinella zoogloeoides BC026].
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ABSTRACT: A bacterial strain BC026 capable of utilizing pyridine as its sole source of carbon and nitrogen was isolated from the activated sludge in a coking wastewater treatment plant. The bacterium featured flocculability and antibiotic resistance to kanamycin, ampicillin and spectinomycine. It could grow well in Ashby nitrogen free culture medium. The strain was identified as Shinella zoogloeoides according to the results of 16S rRNA sequence analysis and Biolog microbial identification system. The experiments of pyridine biodegradation by the pure culture showed that pyridine of 400 mg/L could be degraded completely in 17 h under the condition of inoculum 0.1 g/L, 30 degrees C, 180 r/min and pH 7. BC026 could keep high degradative activity in mineral salt medium containing pyridine with a concentration ranging from 99 mg/L to 1 806 mg/L. Higher initial concentration of pyridine caused repression on BC026 to a certain extent, however, the degradation rate became faster after the strain had been accommodated. The optimal conditions for the degradation were 30-35 degrees C and pH 8. The research on metabolic pathway of pyridine by BC026 indicated that the first step of pyridine degradation was C-N bonds cleavage, generating NH4+ and glutaraldehyde. Then glutaraldehyde was oxidized into glutaric acid, and finally into CO2 and H2O. 59.5% nitrogen from pyridine was transferred into ammonium in the whole degradation.Huan jing ke xue= Huanjing kexue / [bian ji, Zhongguo ke xue yuan huan jing ke xue wei yuan hui "Huan jing ke xue" bian ji wei yuan hui.] 11/2008; 29(10):2938-43. -
Article: Levels and distribution of polybrominated diphenyl ethers in plant, shellfish and sediment samples from Laizhou Bay in China.
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ABSTRACT: Polybrominated diphenyl ethers (PBDEs) are potentially harmful and persistent environmental pollutants. PBDEs concentrations are reported in plant, shellfish and sediment samples collected from Chinese Laizhou Bay. The summation operator(11)PBDE concentrations in plant and shellfish samples from Laizhou Bay were in the range of 70-5900ngg(-1) and 230-720ngg(-1) lipid, respectively. The summation operator(11)PBDEs concentrations in river sediment intervals samples ranged from 1.3 to 1800ng g(-1) dry weight. Pearson correlation analyses were performed on concentrations of PBDEs congeners of different sediment sample intervals. There were significant positive correlations for BDE 28 and BDE 100 (r=0.945, p<0.01), BDE 47 and BDE 99 (r=0.879, p<0.01), BDE 153 and BDE 154 (r=0.934, p<0.01), nona-BDEs and BDE 209 (r>0.934, p<0.01). BDE 209 was the predominant congener in all analyzed samples, consistent with the fact that deca-BDE technical mixtures are the dominant PBDEs product in Laizhou Bay. Data showed that PBDEs should be considered as an increasing pollution problem in the Laizhou Bay region.Chemosphere 04/2008; 71(6):1043-50. · 3.21 Impact Factor -
Article: Reduction of precursors of chlorination by-products in drinking water using fluidized-bed biofilm reactor at low temperature.
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ABSTRACT: OBJECTIVE: To investigate the reduction of chlorination by-products (CBPs) precursors using the fluidized-bed biofilm reactor (FBBR). METHODS: Reduction of total organic carbon (TOC), ultraviolet absorbance (UV254), trihalomethane (THM) formation potential (THMFP), haloacetic acid (HAA) formation potential (HAAFP), and ammonia in FBBR were evaluated in detail. Results The reduction of TOC or UV254 was low, on average 12.6% and 4.7%, respectively, while the reduction of THMFP and HAAFP was significant. The reduction of ammonia was 30%-40% even below 3 degrees C, however, it could quickly rise to over 50% above 3degrees C. Conclusions The FBBR effectively reduces CBPs and ammonia in drinking water even at low temperature and seems to be a very promising and competitive drinking water reactor for polluted surface source waters, especially in China.Biomedical and Environmental Sciences 11/2006; 19(5):360-6. · 1.35 Impact Factor -
Article: Seasonal pollution characteristics of organic compounds in atmospheric fine particles in Beijing.
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ABSTRACT: Beijing is a rapidly developing city with severe and unique air pollution problems. Organic matter is the most abundant fraction in fine particles in Beijing, occupying 30-50% of the total mass, indicating its key role in air pollution control. However, detailed chemical characterization of particulate organic matter in Beijing has never been reported. In this study, fine particles in the urban atmosphere in Beijing were investigated for its organic components by GC/MS technique. Over 100 individual organic compounds were identified and quantified in 25 PM2.5 samples from the summer, autumn and winter of 2002-2003. Alkanes, fatty acids, dicarboxylic acids, polycyclic aromatic hydrocarbons and some important tracer compounds (hopanes, levoglucosan and steroids) were the major constituents with the sum of their concentrations of 502, 1471 and 1403 ng m(-3) in summer, autumn and winter, respectively. Different organic compounds presented apparently different seasonal characteristics, reflecting their different dominant emission sources, such as coal combustion, biomass burning and cooking emission. The abundance and origin of these organic compounds are discussed to reveal seasonal air pollution characteristics of Beijing.Science of The Total Environment 05/2006; 359(1-3):167-76. · 3.29 Impact Factor -
Article: [Mass size distribution of Beijing particulate matters and its inorganic water-soluble ions in winter and summer].
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ABSTRACT: To understand one of the important characteristics of Beijing particulate matter pollution, the mass size distribution of particulate matters and its water-soluble ions, the particle samples were collected by a MOUDI cascade impactor in Beijing during July 2001, March 2002, July 2002 and January 2003 and every sampling period lasted a week. By analysis, the results indicate that there is "two modes" in the diameter range of the fine particle, one called "condensation mode" and another called "droplet mode", and the reasons of the peak of the accumulation mode appearing in the diameter range of 1 - 1. 8 microm was discussed in this paper. And there was a relatively strong correlation between PM1.8 and PM10 (R2 > 80%), the same to PM(1.8-10) (PM10 minus PM1.8); the ratio of PM1.8s/PM10 varietied between 40% and 60% during the sampling periods; as a result, the mass concentration of PM10 can be decreased by decreasing the concentration of coarse particles; sulfate, nitrate and ammonium are the main component of the inorganic water-soluble ions and the percentage of these three ions in PM1.8 was above 70% when the concentration of fine particle was more than 70 microg x m(-3) and they are the main reason increasing particle concentration.Huan jing ke xue= Huanjing kexue / [bian ji, Zhongguo ke xue yuan huan jing ke xue wei yuan hui "Huan jing ke xue" bian ji wei yuan hui.] 07/2005; 26(4):1-6. -
Article: Biological pretreatment of Yellow River water.
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ABSTRACT: Bio-ceramic filter(BF) and moving-bed biofilm reactor (MBBR) were used for biological pretreatment of Yellow River water in this study. The BF only had slight advantage over MBBR for TOC and ammonia removal. However, like UV254, the average removal rate of THMFP in the BF was much higher than that in the MBBR. UV254 removal did not show obvious correlation with trihalomethane formation potential (THMFP) removal. Hexachlorocyclohexane could be effectively removed in both BF and MBBR. As for diatom and cyanobateria removal the MBBR had better performance than the BF, which was contrary to the average chlorophyll-a ( Chl-a) removal rate. The proposal was made in this study that biological flocculation and sedimentation of sloughed biofilm should play a more important role on algae removal in the MBBR than in the BF. The BF and MBBR could effectively remove microcystins. Moreover, MBBR could be a promising technology for biological pretreatment.Journal of Environmental Sciences 02/2005; 17(4):557-61. · 1.66 Impact Factor -
Article: [Preliminary study on HOx photochemical processes in urban atmosphere of Guangzhou City].
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ABSTRACT: Simultaneous measurements of atmospheric hydroxyl radicals (OH) and other pollutants in Guangzhou city were carried out in July, 2000. The quantitative analysis of HOx reaction cycle during daytime in summer was made. The calculation results indicated that the total production rates of OH and HO2 were about 4.5 x 10(8) OH/(cm3 x s) and 3.8 x 10(8) HO2/(cm3 x s), respectively. The primary OH source in urban atmosphere was the photolysis of HONO, while the main OH sinks were the reactions of OH with VOCs, HCHO, NO2 and CO. The HOx chemistry in urban atmosphere is quite different from that in the remote clean atmosphere.Huan jing ke xue= Huanjing kexue / [bian ji, Zhongguo ke xue yuan huan jing ke xue wei yuan hui "Huan jing ke xue" bian ji wei yuan hui.] 08/2004; 25(4):28-31. -
Article: Distributions of dimethylsulfide in the Bohai sea and Yellow Sea of China.
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ABSTRACT: Dimethylsulfide (DMS) measurements in the surface seawater of China eastern coastline were conducted during March 9-10, 1993 in Bohai Sea along the cruise from Dalian to Tianjin and during September 24-25, 1994 in Yellow Sea along the cruise from Shanghai to Qingdao. On the cruise in Bohai Sea DMS concentrations varied from 0.11 to 2.63 nmol/L with an average of 1.31 nmol/L, while DMS flux was estimated to be 0.85 micromol/(m2 x d) with the range of 0.04-3.12 micromol/(m2 x d). On the cruise in Yellow Sea DMS concentrations varied from 0.95 to 7.48 nmol/L with an average of 2.89 nmol/L, and DMS flux was estimated to be 7.94 micromol/(m2 x d) with the range of 0.11-18.88 micromol/(m2 x d). Variations in DMS concentrations along the latitude in Yellow Sea were observed larger than those along the longitude in Bohai Sea. DMS concentrations and fluxes had a similar spatial trend both in Bohai Sea and Yellow Sea with the correlation coefficients of 0.75 and 0.64, respectively.Journal of Environmental Sciences 12/2003; 15(6):762-7. · 1.66 Impact Factor
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Institutions
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2004–2010
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Peking University
- • College of Environmental Science and Engineering
- • Environmental Science
Beijing, Beijing Shi, China
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