检索结果-南通市图书馆

Frontiers of Environmental Science & Engineering 2024年第5期18卷 1-12页

作者： Jiamin Hu Zhenwen Xie jiane zuo State Key Joint Laboratory of Environmental Simulation and Pollution Control School of EnvironmentTsinghua UniversityBeijing100084China Tsinghua Shenzhen International Graduate School Tsinghua UniversityShenzhen518055China

It has been confirmed that microplastics(MPs)are present in the *** study simulated secondary PE-MPs via aging and mechanical processes to evaluate their effects on Pak choi(Brassica rapa L.)over 21 *** common pollutants,dichlorodiphenyltrichloroethane(DDT)and naphthalene,were used in the combined toxicity *** results indicated that the growth of Pak choi was significantly inhibited after exposure to secondary PE-MPs,and the combined effects were antagonistic,owing to the adsorption capacity of secondary PE-MPs to DDT and *** stress in Pak choi can be markedly affected,leading to oxidative damage to plant *** moisture content,soil bulk density,soil density,cation exchange capacity(CEC),and FDA hydrolase in the planted soils increased in the treated groups,and the TOC content changed *** also found that the microbial composition of the soil in the DDT and naphthalene groups showed more significant alterations than that in the other *** diversity analysis showed that species diversity increased in the combined groups but indicated a clear downward trend in the single MPs *** study suggests that secondary PE-MPs harm the growth of Pak choi and can change soil properties,revealing the harm to the ecosystem of MPs in the soil.

关键词： Secondary PE-MPs Combined effects Oxidative stress Soil properties Bacterial community

Performance and mechanism for cadmium and lead adsorption from water and soil by corn straw biochar

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Frontiers of Environmental Science & Engineering 2017年第2期11卷 157-164页

作者： Tong Chi jiane zuo Fenglin Liu State Key Joint Laboratory of Environment Simulation and Pollution Control School of Environment Tsinghua University Beijing 100084 China

Cadmium （Cd） and lead （Pb） in water and soil could be adsorbed by biochar produced from corn straw. Biochar pyrolyzed under 400℃ for 2 h could reach the ideal removal efficiencies （99.24% and 98.62% for Cd and Pb, respectively） from water with the blochar dosage of 20 g. L^-1 and initial concentration of 20 mg.L^-1 . The pH value of 4-7 was the optimal range for adsorption reaction. The adsorption mechanism was discussed on the basis of a range of characterizations, including X-ray diffraction （XRD）, X-ray photoelectron spectroscopy （XPS）, Fourier transform infrared spectroscopy （FTIR） and Raman analysis; it was concluded as surface complexation with active sorption sites （-OH, -COO-）, coordination with 7c electrons （C = C, C = O） and precipitation with inorganic anions （OH-, CO3^2- , SO4^2- ） for both Cd and Pb. The sorption isotherms fit Langmuir model better than Freundlich model and the saturated sorptlon capacities for Cd and Pb were 38.91 mg·g^-1 and 28.99 mg.g^-1 , espectwely. When mixed with soil, biochar could effectively increase alkalinity and reduce bioavailability of heavy metals. Thus, biochar derived from corn straw would be a green material for both removal of heavy metals and amelioration of soil.

关键词： Corn strawBiocharHeavy metalsSorption isothermBioavailability

The performance of a combined nitritation–anammox reactor treating anaerobic digestion supernatant under various C/N ratios

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2015年第4期27卷 207-214页

作者： Jian Zhao jiane zuo Jia Lin Peng Li State Key Joint Laboratory of Environment Simulation and Pollution Control School of Environment Tsinghua University

A combined nitritation–anammox reactor was developed to treat the digestion supernatant under various C/N ratios. Due to the difficulties for heterotroph to utilize the refractory organics, the reactor presented relatively stable performance with increasing supernatant addition. Nevertheless, the adverse effects of supernatant would accumulate during the long-term operation and thus weakened the activity and shock resistance of microbes,which further led to the gradual decrease of reactor performance after 92 days＇ *** this circumstance, supernatant with volatile fatty acids（VFAs） residuals was further introduced into the reactor to investigate the performance of combined nitritation–anammox process with VFA addition. With the appearance of VFAs, the nitrogen removal performance gradually restored and the reactor finally achieved stable and efficient performance with C/N ratio of 0.35. The VFA residuals within 150 mg/L in the supernatant served as the extra electron donors and stimulated the heterotrophic denitrification process, which was vital for the enhancement of reactor. The nitrogen removal rate and total nitrogen removal efficiency reached 0.49 kg N/（m^3·day） and 88.8% after 140 days＇ operation, respectively. The combined nitritation–anammox reactor was proved suitable to treat digestion supernatant.

关键词： Combined nitritation–anammox Anaerobic digestion supernatant C/N ratios Volatile fatty acids

Eubacteria and Archaea community of simultaneous methanogenesis and denitrification granular sludge

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2008年第5期20卷 626-631页

作者： SUN Yujiao zuo jiane CHEN Lili WANG Yong Department of Environmental Science and Engineering Tsinghua University Beijing 100084 China College of Water Sciences Beijing Normal University Beijing 100875 China

Based on the successful performance of a lab-scale upflow anaerobic sludge blanket （UASB） reactor with the capacity of simultaneous methanogenesis and denitrification （SMD）, the specific phylogenetic groups and community structure of microbes in the SMD granule in the UASB reactor were investigated by the construction of the Eubacteria and Archaea 16S rDNA clone libraries, fragment length polymorphism, and sequence blast. Real time quantitative-polymerase chain reaction （RTQ-PCR） technique was used to quantify the contents of Eubacteria and Archaea in the SMD granule. The contents of some special predominant methanogens were also investigated. The results indicated that the Methanosaeta and Methanobacteria were the predominant methanogens in all Archaea in the SMD granule, with contents of 71.59% and 22.73% in all 88 random Archaea clones, respectively. The diversity of Eubacteria was much more complex than that of Archaea. The low GC positive gram bacteria and ε-Protebacteria were the main predominant Eubacteria species in SMD granule, their contents were 49.62% and 12.03% in all 133 random Eubacteria clones respectively. The results of RTQ-PCR indicated that the content of Archaea was less than Eubacteria, the Archaea content in total microorganisms in SMD granule was about 27.6%.

关键词： simultaneous methanogenesis and denitrification (SMD) granular sludge 16S rDNA clone libraries RTQ-PCR community structure

A combined evaluation of the characteristics and antibiotic resistance induction potential of antibiotic wastewater during the treatment process

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2024年第4期138卷 626-636页

作者： Sun Miao Yanyan Zhang Cong Men Yiou Mao jiane zuo State Key Joint Laboratory of Environment Simulation and Pollution Control School of EnvironmentTsinghua UniversityBeijing 100084China School of Energy and Environmental Engineering Beijing Key Laboratory of Resource-Oriented Treatment of Industrial PollutantsUniversity of Science and Technology BeijingBeijing 100083China High School Affiliated to Renmin University of China Beijing 100080China Tsinghua Shenzhen International Graduate School Shenzhen 518055China

Antibiotic wastewater contains a variety of pollutant stressors that can induce and promote antibiotic resistance(AR)when released into the *** these substances are mostly in concentrations lower than those known to induce AR individually,it is possible that antibiotic wastewater discharge might still promote the AR transmission risk via additive or synergistic ***,the comprehensive effect of antibiotic wastewater on AR development has rarely been evaluated,and its treatment efficiency remains ***,samples were collected from different stages of a cephalosporin production wastewater treatment plant,and the potential AR induction effect of their chemical mixtures was explored through the exposure of the antibiotic-sensitive Escherichia coli K12 *** with raw cephalosporin production wastewater significantly promoted mutation rates(3.6×10^(3)-9.3×10^(3)-fold)and minimum inhibition concentrations(6.0-6.7-fold)of *** against ampicillin and *** may be attributed to the inhibition effect and oxidative stress of cephalosporin wastewater on *** AR induction effect of cephalosporin wastewater decreased after the coagulation sedimentation treatment and was completely removed after the full treatment process.A Pearson correlation analysis revealed that the reduction in the AR induction effect had a strong positive correlation with the removal of organics and biological *** indicates that the antibiotic wastewater treatment had a collaborative processing effect of conventional pollutants,toxicity,and the AR induction *** study illustrates the potential AR transmission risk of antibiotic wastewater and highlights the need for its adequate treatment.

关键词： Antibiotic wastewater treatment plant Antibiotic resistance Antibiotic resistance induction effect Correlation analysis Biological toxicity

Zeolite (Na) modified by nano-Fe particles adsorbing phosphate in rainwater runoff

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2012年第11期24卷 1929-1933页

作者： Lili Gan jiane zuo Bangmi Xie Peng Li Xia Huang State Key Joint Laboratory of Environment Simulation and Pollution Control School of EnvironmentTsinghua UniversityBeijing 100084China

Zeolite （Na） modified by self-synthesized nano-Fe particles was used as infiltration media to adsorb phosphate in rainwater runoff. The adsorption capacities increased up to 75 times that of natural zeolite at a saturated equilibrium phosphate concentration of 0.42 mg/L. The correlation of capacity and material-specific surface area indicated that specific surface area was not the key factor contributing to the capacity improvement. SEM and XRD analysis showed that chemical reaction between Fe and P to form new products like cacoxenite is the main reason for the increased capacity, and that the method of adding metal ions or particles to improve the adsorption capacity for phosphate is feasible.

关键词： rainwater runoff phosphate adsorption nano-iron modification

Methanogenic community structure in simultaneous methanogenesis and denitrification granular sludge

在线全文

学校读者我要写书评

暂无评论

Frontiers of Environmental Science & Engineering 2018年第4期12卷 99-107页

作者： Yujiao Sun Juanjuan Zhao Lili Chen Yueqiao Liu jiane zuo College of Water Science Beijing Normal University Beijing 100875 China School of Environment Tsinghua University Beijing 100084 China Envbonmental Engineering Department North China Institute of Science and Tectmology Beijing 101601 China

A laboratory scale up-flow anaerobic sludge bed （UASB） bioreactor ted with synthetic wastewater was operated with simultaneous methanogenesis and denitrification （SMD） granules for 235 days with a gradient decrease of C/N. Molecular cloning, qRT-PCR and T-RFLP were applied to study tile methanogenic community structures in SMD granules and their changes in response to changing influent C/N. The results indicate that when C/N was 20：1, the methane production rate was tastest, and Methanosaetaceae and Methanobacteriaceae were the primary methanogens within tile Archaea. The richness and evenness of methanogenic bacteria was best with the highest T-RFLP diversity index of 1.627 in the six granular sludge samples. When C/N was reduced from 20：1 to 5：1, tbe methanogenic activity of SMD granules decreased gradually, and the relative quantities of methanogens decreased from 36.5% to 10.9%. The abundance of Methanosaetaceae in Archaea increased from 64.5% to 84.2%, while that of Methanobacteriaceae decreased from 18.6% to 11.8%, and the richness and evenness of methanogens decreased along with the T-RFLP diversity index to 1.155, suggesting that the community structure reflected the succession to an unstable condition represented by high nitrate concentrations.

关键词： Simultaneous methanogenesis and denitrifi-cation (SMD) Methanogens Community structure Diversity index Granular sludge

Concept and application of anaerobic suspended granular sludge bed （SGSB） reactor for wastewater treatment

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Frontiers of Environmental Science & Engineering 2014年第5期8卷 797-804页

作者： Mingxia ZHENG Zhong YAN jiane zuo Kaijun WANG State Key Joint Laboratory of Environmental Simulation and Pollution Control School of Environment Tsinghua University Beijing 100084 China Beijing Municipal Research Institute of Environmental Protection Beijing 100037 China

Bed expansion serves an important function in the design and operation of an upflow anaerobic reactor. An analysis of the flow pattern of expanded granular sludge bed （EGSB） reactors shows that most EGSB reactors do not behave as expanded bed reactors, as is widely perceived. Rather, these reactors behave as fluidized bed reactors based on the classic chemical reactor theory. In this paper, four bed expansion modes, divided as static bed, expanded bed, suspended bed, and fluidized bed, for bioreactors are proposed. A high-rate anaerobic suspended granular sludge bed （SGSB） reactor was then developed. The SGSB reactor is an upflow anaerobic reactor, and its expansion degree can be easily controlled within a range to maintain the suspended status of the sludge bed by controlling upfiow velocity. The results of the full-scale reactor confirmed that the use of SGSB reactors is advantageous. The full-scale SGSB reactor runs stably and achieves high COD removal efficiency （about 90%） at high loading rates （average 40 kg-COD·m^-3·d^-1, maximum to 52 kg·COD·m^-3 ·d^-1） based on the SGSB theory, and its expansion degree is between 22% and 37%.

关键词： expansion characteristic high-rate bioreactor,anaerobic suspended granular sludge bed expandedgranular sludge bed reactor

Cation exchange resin supported nanoscale zero-valent iron for removal of phosphorus in rainwater runoff

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Frontiers of Environmental Science & Engineering 2014年第3期8卷 463-470页

作者： Bangmi XIE jiane zuo Lili GAN Fenglin LIU Kaijun WANG State Key Joint Laboratory of Environment Simulation and Pollution Control School of Environment Tsinghua University Beijing 100084 China

Self-made cation exchange resin supported nanoscale zero-valent iron （R-nZVI） was used to remove phosphorus in rainwater runoff. 80% of phosphorus in rainwater runoff from grassland was removed with an initial concentration of 0.72 mg. L-1 phosphorus when the dosage of R-nZVl is 8 g per liter rainwater, while only 26% of phosphorus was removed when using cation exchange resin without supported nanoscale zero-valent iron under the same condition. The adsorption capacity of R-nZVI increased up to 185 times of that of the cation exchange resin at a saturated equilibrium phosphorous concentration of 0.42 mg. L-1. Various techniques were implemented to characterize the R-nZVI and explore the mechanism of its removal of phosphate. Scanning electron microscopy （SEM） indicated that new crystal had been formed on the surface of R-nZVI. The result from inductive coupled plasma （ICP） indicated that 2.1% of nZVI was loaded on the support material. The specific surface area was increased after the load of nanoscale zero-valent iron （nZVI）, according to the measurement of BET-N2 method. The result of specific surface area analysis also proved that phosphorus was removed mainly through chemical adsorption process. X-ray photoelectron spectroscopy （XPS） analysis showed that the new product obtained from chemical reaction between phosphate and iron was ferrous phosphate.

关键词： nanoscale zero-valent iron(R-nZVI) cation exchange resin rainwater runoff phosphorus adsorption

Emission of greenhouse gases from sewer networks:field assessment and isotopic characterization

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Frontiers of Environmental Science & Engineering 2024年第10期18卷 1-13页

作者： Xin Yuan Xianguo Zhang Yuqi Yang Xuan Li Xin Xing jiane zuo State Key Joint Laboratory of Environment Simulation and Pollution Control School of EnvironmentTsinghua UniversityBeijing 100084China Capital Eco-Pro Group Beijing 100444China Tsinghua Shenzhen International Graduate School Shenzhen 518055China

Sewer networks play a vital role in sewage collection and transportation,and they are being rapidly ***,the microbial processes occurring within these networks have emerged as significant contributors to greenhouse gas(GHG)*** to that from other sectors,our understanding of the magnitude of GHG emissions from sewer networks is currently *** this study,we conducted a GHG emission assessment in an independent sewer network located in Beijing,*** findings revealed annual emissions of 62.3 kg CH_(4) and 0.753 kg ***_(4) emerged as the primary GHG emitted from sewers,accounting for 87.4%of the total GHG ***,compared with main pipes,branch pipes were responsible for a larger share of GHG emissions,contributing to 76.7%of the total.A GHG emission factor of 0.26 kg CO_(2)-eq/(m:yr)was established to quantify sewer GHG *** examining the isotopic signatures of CO_(2)/CH_(4) pairs,it was determined that CH_(4) production in sewers primarily occurred through acetate ***,the structure of sewer pipes had a significant impact on GHG *** study offers valuable insights into the overall GHG emissions associated with sewer networks and sheds ight on themechanismsdriving theseemissions.

关键词： Sewer network Greenhousegases Stablecarbon isotopes Methane Nitrous oxide