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Li Y.,Northwest Agriculture and Forestry University | Li Y.,Research Center for Recycling Agricultural Engineering Technology of Shaanxi Province | Feng Y.,Northwest Agriculture and Forestry University | Feng Y.,Research Center for Recycling Agricultural Engineering Technology of Shaanxi Province | And 6 more authors.
Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering | Year: 2010

In order to explore the optimal water-need rule of glycyrrhiza growth in soil wind erosion area of Loess Plateau, the method of controlling irrigation system was used to carry out deficit irrigation experiment on glycyrrhiza under drought conditions. The plant height, amount of dry matter, leaf area index, net photosynthesis rate and transpiration rate of leaves of glycyrrhiza and soil moisture were dynamically determined in different period of duration. The results showed that there was a significant difference in physiological characters of different treatments of glycyrrhiza with the boost of growing season, the treatment of the irrigation amount 900 m3/hm2 for 4 times had the characteristics of higher plant, larger leaf area index, stronger photosynthesis and more biomass. The conclusion is valuable to increase coverage of vegetation and capability of soil against corrosion in soil wind erosion area of Loess Plateau. Source


Chen Y.,Northwest University, China | Chen Y.,Research Center for Recycling Agricultural Engineering Technology of Shaanxi Province | Yang G.,Northwest University, China | Yang G.,Research Center for Recycling Agricultural Engineering Technology of Shaanxi Province | And 3 more authors.
Renewable and Sustainable Energy Reviews | Year: 2010

As a renewable energy, biogas is not only an important part of the development of rural new energy, but also an important aspect of sustainable development in China. The development process and present status of household biogas, specifically the opportunities and constraints of household biogas in rural China, are discussed in this paper. Only about 19% of the biogas potential has been utilized in rural China. There are several opportunities for household biogas development in rural China, including the problem of rural household energy consumption, the availability of biogas fermentation materials, national financial subsidies, legal and international clean development mechanisms. Also, more research needs to be done in straw fermentation and cold fermentation technology. Training should be conducted to raise the level of biogas customers in comprehensive biogas utilization. Measures should be taken to improve the follow-up services and management of biogas plants. The information presented in this paper will be helpful not only to the sustainable development of household biogas in rural China, but also to the development of biogas in similar countries around the world. Crown Copyright © 2009. Source


Song Z.,Northwest University, China | Song Z.,Research Center for Recycling Agricultural Engineering Technology of Shaanxi Province | Yang G.,Northwest University, China | Yang G.,Research Center for Recycling Agricultural Engineering Technology of Shaanxi Province | And 4 more authors.
BioResources | Year: 2012

Lignocellulosic biomass is considered the most abundant renewable resource that has the potential to contribute remarkably in the supply of biofuel. Previous studies have shown that chemical pretreatment prior to anaerobic digestion (AD) can increase the digestibility of lignocellulosic biomass and methane yield. In the present study, the effect of rice straw pretreatment using ammonium hydroxide (NH3 H2O) and hydrogen peroxide (H2O2) on the biogasification performance through AD was investigated. A self-designed, laboratory-scale, and continuous anaerobic biogas digester was used for the evaluation. Results showed that the contents of the rice straw, i.e. the lignin, cellulose, and hemicellulose were degraded significantly after the NH3 H2O and H2O2 treatments, and that biogas production from all pretreated rice straw increased. In addition, the optimal treatments for biogas production were the 4% and 3% H2O2 treatments (w/w), which yielded 327.5 and 319.7 mL/gVS, biogas, respectively, higher than the untreated sample. Biogas production from H2O2 pretreated rice straw was more favorable than rice straw pretreated with same concentration of ammonia, ranking in the order of 4% ≈ 3% > 2% > 1%. The optimal amount of H2O2 treatment for rice straw biogas digestion is 3% when economics and biogas yields are considered. Source


Feng Y.,Research Center for Recycling Agricultural Engineering Technology of Shaanxi Province | Feng Y.,Northwest University, China | Guo Y.,Research Center for Recycling Agricultural Engineering Technology of Shaanxi Province | Guo Y.,Northwest University, China | And 6 more authors.
Renewable and Sustainable Energy Reviews | Year: 2012

As a fuel, rural biogas is a promising renewable energy source. Policy support is a key initial impetus for industry development. This study explores household biogas development in rural China based on policy support found in literature. Relevant policies, which mainly include directive and guiding policies, economic inspiring policies, research policies, market policies, and other constructive policies, are gradually issued. Moreover, the National People's Congress has enacted five relevant laws, including the Agricultural Law, Renewable Energy Law, Animal Husbandry Law, Energy Conservation Law, and the Act on the Development of Circular Economy. The Energy Law is currently under revision. Relational rules and regulations have also been formed in response to the national policies and laws, which have already produced significant effects. The development of rural household biogas in China is growing steadily, and the technology standard projects have been established. The number of household biogas digesters and biogas annual output in 2010 was double of that in 2005. The offered financial incentive increased from 47 million dollars in 2002 to 760 million dollars in 2011. Policy supports play an important role in rural biogas development. And thus, additional national policy supports are necessary in the fields of scientific research, technological development, and biogas use model. © 2012 Elsevier Ltd. Source


Song Z.,Northwest University, China | Song Z.,Research Center for Recycling Agricultural Engineering Technology of Shaanxi Province | Qin J.,Northwest University, China | Qin J.,Research Center for Recycling Agricultural Engineering Technology of Shaanxi Province | And 6 more authors.
Advanced Materials Research | Year: 2012

China is a large agricultural country that has abundant biomass resource which can be generated biogas for heating and lighting. To improve biogas production efficiency of human excreta, which is a main kind of material in household biogas use, a laboratory-scale simulated experimental using self-designed constant temperature anaerobic fermentation equipment was conducted in our study. The results showed that increase of temperature can improve biogas generation efficiency of human excreta, and the other way is to mix the human excreta with other materials especially with the high C materials. Compare with the high costing of increase temperature, co-digestion with wheat straw has obvious advances: the crop straw can easily obtain and both wastes can be handled in the anaerobic fermentation process. The co-digestion developed in our study may be applicable to human excreta with other crop straws such as corn straw for biogas production. © (2012) Trans Tech Publications, Switzerland. Source

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