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91.
92.
Guochen Zheng Jianzheng Li Feng Zhao Liguo Zhang Li Wei Qiaoying Ban Yongsheng Zhao 《Frontiers of Environmental Science & Engineering in China》2012,6(1):125-130
To investigate the influence of illumination on the fermentative hydrogen production system, the hydrogen production efficiencies
of two kinds of anaerobic activated sludge (floc and granule) from an anaerobic baffled reactor were detected under visible
light, dark and light-dark, respectively. The 10 mL floc sludge or granular sludge was respectively inoculated to 100 mL diluted
molasses (chemical oxygen demand of 8000 mg·L−1) in a 250 mL serum bottle, and cultured for 24 h at 37°C under different illumination conditions. The results showed that
the floc was more sensitive to illumination than the granule. A hydrogen yield of 19.8 mL was obtained in the dark with a
specific hydrogen production rate of 3.52 mol·kg−1MLVSS·d−1 (floc), which was the highest among the three illumination conditions. Under dark condition, the hydrogen yield of floc sludge
reached the highest with the specific hydrogen production rate of 3.52 mol·kg−1MLVSS·d−1, and under light-dark, light, the specific hydrogen production rate was 3.11 and 2.21 mol·kg−1MLVSS·d−1, respectively. The results demonstrated that the illumination may affect the dehydrogenase activity of sludge as well as
the activity of hydrogen-producing acetogens and then impact hydrogen production capacity. 相似文献
93.
In this work we characterize the public perception of one kind of ecological risk—blue-algae bloom in Hongze Lake, China,
based on the psychometric paradigm method. In the first survey of May 2008, 300 respondents of Sihong County adjacent to Hongze
Lake were investigated, with a total of 156 questionnaires returned. Then in a second survey of July 2008, 500 respondents
from the same research area were investigated, with 318 questionnaires collected. This research firstly attempted to explore
the local respondents’ degree of concern regarding ecological changes to Hongze Lake in the last ten years. Secondly, to explore
the public perception of blue-algae bloom compared to three typical kinds of hazards including earthquake, nuclear power and
public traffic. T-test was used to examine the difference of risk perception in these four hazards over time. The third part
of this research, with demographic analysis and nonparametric statistical test, predicted the different groups of respondents’
willingness to accept (WTA) risk of blue-algae bloom in two surveys. Using multiple linear regression analysis, the risk perception
model explained 28.3% of variance in the WTA blue-algae bloom risk. The variables of Knowledge, Social effect, Benefit, Controllability
and Trust in government were significantly correlated with WTA, which implied that these variables were the main influencing
factors explaining the respondents’ willingness to accept risk. The results would help the Chinese government to comprehend
the public’s risk perception of the lake ecosystem, inducing well designed communication of risks with public and making effective
mitigation policies to improve people’s rational risk judgment. 相似文献
94.
95.
Xuan Ban Qiuzhen Wu Baozhu Pan Yun Du Qi Feng 《Environmental monitoring and assessment》2014,186(7):4237-4247
Composite Water Quality Identification Index (CWQII) and multivariate statistical techniques were used to investigate the temporal and spatial variations of water quality in Honghu Lake. The aims are to explore the characteristics of water quality trends in annual, monthly, and site spatial distribution and to identify the main pollution factors. The results showed that the values of CWQII increased from 2.0 to 4.0 from the years 2001 to 2005, then decreased from 2006 and kept a balance between 2.0 and 3.0 from 2006 to 2011, indicating that the water quality of Honghu Lake deteriorated from 2001 to 2005 and has gradually improved since 2006, which were likely achieved after water protection measurements taken since 2004. The monthly change rules of water quality were influenced by a superposition of natural processes and human activities. In samples numbered 1–9 from upstream to downstream, the maximum values of CWQII often occurred in sample site 9 while the minimum ones often occurred in sample site 2, indicating that the water quality near the upstream tributary was the poorest and that in the core zone was the best. Incoming water from the trunk canal of the Sihu area upstream was the largest pollution source. The sensitive pollution nutrients were mainly caused by the total nitrogen, followed by the total phosphorus. 相似文献
96.
Guochen ZHENG Jianzheng LI Feng ZHAO Liguo ZHANG Li WEI Qiaoying BAN Yongsheng ZHAO 《Frontiers of Environmental Science & Engineering》2012,6(1):125-130
To investigate the influence of illumination on the fermentative hydrogen production system, the hydrogen production efficiencies of two kinds of anaerobic activated sludge (floc and granule) from an anaerobic baffled reactor were detected under visible light, dark and light-dark, respectively. The 10 mL floc sludge or granular sludge was respectively inoculated to 100 mL diluted molasses (chemical oxygen demand of 8000 mg·L-1) in a 250 mL serum bottle, and cultured for 24 h at 37°C under different illumination conditions. The results showed that the floc was more sensitive to illumination than the granule. A hydrogen yield of 19.8 mL was obtained in the dark with a specific hydrogen production rate of 3.52 mol·kg-1MLVSS·d-1 (floc), which was the highest among the three illumination conditions. Under dark condition, the hydrogen yield of floc sludge reached the highest with the specific hydrogen production rate of 3.52 mol·kg-1MLVSS·d-1, and under light-dark, light, the specific hydrogen production rate was 3.11 and 2.21 mol·kg-1MLVSS·d-1, respectively. The results demonstrated that the illumination may affect the dehydrogenase activity of sludge as well as the activity of hydrogen-producing acetogens and then impact hydrogen production capacity. 相似文献
97.
Optimization for solidification of low-level-radioactive resin using Taguchi analysis 总被引:3,自引:0,他引:3
Solidification of low-level-radioactive (LLW) resin was optimized using Taguchi analytical methodology. The ingredients in LLW mortar which caused the solidification of cement were evaluated through consecutive measurements of the effects of various concentrations of ingredients. Samples selected according to Taguchi's method were separated into 18 different categories and measured at the 7th, 21st, and 28th day after fabrication on developing effects. Evaluations of the various samples focused on whether the compressive and bending strength fulfilled the special criteria of the Taiwan Power Company (TPC). Similar results indicated that both furnace slag and fly ash were the dominant material resulting from the solidification of LLW mortar. The superior combination was obtained as furnace slag 24 wt.%, fly ash 24 wt.%, and cement 8 wt.% to mix 24 wt.% of resin with 20 wt.% of water, to fulfill the contemporary requirements of TPC. 相似文献
98.
Soon Thiam Khu Shie‐Yui Liong Vladan Babovic Henrik Madsen Nitin Muttil 《Journal of the American Water Resources Association》2001,37(2):439-451
ABSTRACT: Genetic programming (GP), a relatively new evolutionary technique, is demonstrated in this study to evolve codes for the solution of problems. First, a simple example in the area of symbolic regression is considered. GP is then applied to real‐time runoff forecasting for the Orgeval catchment in France. In this study, GP functions as an error updating scheme to complement a rainfall‐runoff model, MIKE11/NAM. Hourly runoff forecasts of different updating intervals are performed for forecast horizons of up to nine hours. The results show that the proposed updating scheme is able to predict the runoff quite accurately for all updating intervals considered and particularly for updating intervals not exceeding the time of concentration of the catchment. The results are also compared with those of an earlier study, by the World Meteorological Organization, in which autoregression and Kalman filter were used as the updating methods. Comparisons show that GP is a better updating tool for real‐time flow forecasting. Another important finding from this study is that nondimensionalizing the variables enhances the symbolic regression process significantly. 相似文献
99.
100.
锦州市2005-2006年环境空气质量现状分析 总被引:3,自引:0,他引:3
根据锦州市2005年1月1日至2006年12月31日的环境空气质量监测资料,对锦州市每日的空气质量水平和可吸入颗粒物、二氧化硫和二氧化氮的月平均值和年平均值、空气质量级别、首要污染物等指标进行了统计分析.结果表明,锦州市的空气污染状况与冬季采暖和大尺度的天气现象如季风和降雨量等密切相关. 相似文献