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An innovative integrated system utilizing solar energy as power for the treatment of decentralized wastewater

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Journal of Environmental Sciences 2013年第2期25卷 274-279页

作者： changfu han Junxin Liu hanwen Liang Xuesong Guo Lin Li Research Center for Eco-Environmental Sciences Chinese Academy of Sciences

This article reports an innovative integrated system utilizing solar energy as power for decentralized wastewater treatment, which consists of an oxidation ditch with double channels and a photovoltaic （PV） system without a storage battery. Because the system operates without a storage battery, which can reduce the cost of the PV system, the solar radiation intensity affects the amount of power output from the PV system. To ensure that the power output is sufficient in all different weather conditions, the solar radiation intensity of 78 W/m 2 with 95% confidence interval was defined as a threshold of power output for the PV system according to the monitoring results in this study, and a step power output mode was used to utilize the solar energy as well as possible. The oxidation ditch driven by the PV system without storage battery ran during the day and stopped at night. Therefore, anaerobic, anoxic and aerobic conditions could periodically appear in the oxidation ditch, which was favorable to nitrogen and phosphate removal from the wastewater. The experimental results showed that the system was efficient, achieving average removal efficiencies of 88% COD, 98% NH 4 ＋ -N, 70% TN and 83% TP, under the loading rates of 140 mg COD/（g MLSS·day）, 32 mg NH 4 ＋ -N/（g MLSS·day）, 44 mg TN/（g MLSS·day） and 5 mg TP/（g MLSS·day）.

关键词： solar energy PV system wastewater treatment integrated biological reactor

Synthetic Control Method for Crystallite Size of MOF-5

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Chemical Research in Chinese Universities 2014年第3期30卷 356-361页

作者： han Pengfei YUAN changfu XU Junyi LIU Jin School of Metallurgy and Environment Central South University Changsha 410083 t~ R. China

We reported a dripping solvothermal method for synthesizing metal-organic framework-5（MOF-5）. It started from separately dissolving Zn（NO3）2 and terephthalic acid（H2BDC） in dimethyl formamide（DMF）, and then dripping one solution into the other. Results of SEM, XRD and laser particle size distribution show that regular cubic-shaped and micro-crystallite powder of MOF-5 can be obtained. The d0.5（volume-median-diameter） values are 4.32 μm for particles prepared by dripping Zn（NO3）2 into H2BDC（ZH） and 9.32 μm for those prepared by dripping H2BDC into Zn（NO3）2（HZ）, much smaller than 22,7 μm that of particles prepared by the traditional adding water solvothermal method（L）. The standard deviations of the particle size distributions fitted by the GaussAmp model are 2.49, 4.38 and 15.4 respectively for ZH, HZ and L, further revealing narrower size distributions of particles prepared by the dripping method. In addition, the Langmuir specific surface areas are 923 m^2/g for ZH and 868 m^2/g for HZ. The TGA results present mass losses of 4.18% and 3.62% at 105 ℃, 17.19% and 14.78% at 245 ℃, 39.04% and 34.85% at 600℃ separately for ZH and HZ, which correspond to the removal of H20, DMF and the decomposition of MOF-5. This indicates that MOF-5 has a strong adsorption ability for small molecules. Besides, the mass loss of 48.39%（ZH） and 41.02%（HZ）between 400 ℃ and 600 ℃ are less than the theoretical value of 57.81% for MOF-5 decomposition to ZnO, suggesting that an impure phase with an extra amount of ZnO may exist in the cavities of MOF-5.

关键词： Metal-organic framework-5(MOF-5) Dripping solvothermal method Size distribution

New Challenges in the Development of Agriculture and Rural Areas

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Qiu Shi 2013年第3期5卷 61-66页

作者： han changfu

Accelerating the Modernization of Agriculture

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Qiu Shi 2012年第1期4卷 46-52页

作者： han changfu

Innovation and Application： The Promotion of Science and Technology in Agriculture

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Qiu Shi 2012年第3期4卷 70-78页

作者： han changfu

China＇s Food Security Strategy

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Qiu Shi 2015年第2期7卷 86-92页

作者： han changfu

Correctly Understanding and Resolving Issues Concerning Chinese Farmers

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Qiu Shi 2014年第3期6卷 49-56页

作者： han changfu

Changes and Revitalization in Rural China:the Experience of Jiang Village

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Qiu Shi 2018年第4期10卷 53-60页

作者： han changfu Agriculture and Rural Affairs of the People's Republic of China

This is the first year of the rural revitalization strategy's ***,I went on a field trip to Jiang Village,the village which the famous sociologist *** Xiaotong visited 80 years ago and wasthe subject of his monograph Peasant Life in China:A Field Study of Country Life in the Yangtze *** field trip to Jiang Village gave me much to reflect upon about moving forward with rural revitalization.

关键词： Rural China Jiang Village

Pursuing Healthy and Sustainable Urbanization

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ChinAfrica 2014年第1期6卷 10-11页

作者： han changfu

The 2013 Central Economic Work Conference （CEWC）, an annual tone-setting economic meeting attended by top Chinese leaders, was held in Beijing in mid- December 2013. The fourday meeting reviewed China＇s economic progress in 2013 and listed major tasks for 2014. Urbanization was the focus of an entirely separate conference that met during the CEWC.

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