Research Center for Recycling Agricultural Engineering Technology of Shaanxi Province

China

Research Center for Recycling Agricultural Engineering Technology of Shaanxi Province

China

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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.


Song Z.,Northwest University, China | Song Z.,Research Center for Recycling Agricultural Engineering Technology of Shaanxi Province | Zhang C.,Northwest University, China | Yang G.,Northwest University, China | And 7 more authors.
Renewable and Sustainable Energy Reviews | Year: 2014

As a renewable energy source, biogas not only alleviates energy shortage in rural areas but also effectively reduces the environmental risk associated with agricultural waste management. This study presents a comprehensive overview of development of household bio-digesters and medium and large-scale biogas plants (MLBPs) in China, and discusses the advantages and disadvantages of both biogas systems in terms of environmental performance, role in agriculture, economic benefit, government support, energy efficiency, societal influence, and resident living mode. Both systems have their relative strengths and weaknesses. The operation and maintenance of household bio-digesters are easier, and their environmental and economic performances are superior compared to those of MLBPs. However, MLBPs have higher energy efficiency and better social effect. Thus, the choice of a biogas generation system depends on the local circumstances. Household bio-digesters are suitable for undeveloped regions where the rural residents live far apart from each other, whereas MLBPs are suitable for developed regions where people live close together. The government can play a positive role in preventing the negative impacts of rural social structural change, such as those of urban migration of adults, on household biogas development. Additionally, establishment of scientific and technological support and service systems is recommended for further development of biogas in rural China. © 2014 Elsevier Ltd.


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.


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.


Yin D.,Northwest University, China | Yin D.,Research Center for Recycling Agricultural Engineering Technology of Shaanxi Province | Liu W.,Northwest University, China | Liu W.,Research Center for Recycling Agricultural Engineering Technology of Shaanxi Province | And 10 more authors.
Bioresource Technology | Year: 2014

Anaerobic digestion (AD) with livestock manure is a promising way for biogas production. This work presents the influence of photo-dark fermentation on biogas production of pig manure (PM) and dairy manure (DM). All sets were conducted with temperature 35±2°C and total solid concentrations 8%: PM1 and DM1 in transparent reactor under sunlight for photo-dark fermentation, and PM2 and DM2 in non-transparent reactor for dark fermentation. DM2 had the best cumulative biogas production (CBP) of 15,447.5mL, followed by PM1 (15,020mL) with stable pH and low total ammonium nitrogen (TAN) concentration (1384.99mg/L), and DM1 and PM2. The CBP of DM2 was 5.77 times as much as PM2. The relationship between CBP and four factors including volatile fatty acid (VFA), TAN, total alkalinity and pH was analyzed. pH gained the maximum determination coefficient with the CBP among all sets and total alkalinity showed negative correlation with CBP of PM1 and DM1. © 2014 Elsevier Ltd.


Song Z.-L.,Northwest University, China | Song Z.-L.,Research Center for Recycling Agricultural Engineering Technology of Shaanxi Province | Yag G.-H.,Northwest University, China | Yag G.-H.,Research Center for Recycling Agricultural Engineering Technology of Shaanxi Province | And 6 more authors.
Journal of Integrative Agriculture | Year: 2013

A pretreatment process for hydrogen peroxide (H2O2) was optimized to enhance the biodegradation performance of rice straw and increase biogas yield. A determination experiment was conducted under predicted optimal conditions. Optimization was implemented using response surface methodology. The effects of biodegradation and the interactive effects of pretreatment time (PT), H2O2 concentration (HC), and substrate to inoculum ratio (S/I) on methane yield were investigated. The lignin, cellulose, and hemicellulose of rice straw were significantly degraded with increasing HC. The optimal conditions for the use of pretreated rice straw in anaerobic digestion were a 6.18-d PT, 2.68% HC (w/w total solid), and 1.08 S/I; these conditions result in a methane yield of 288 mL g-1 volatile solids (VS). A determination coefficient of 95.2% was obtained, indicating that the model used to predict the anabolic digestion process has a favorable fit with the experimental parameters. The determination experiment resulted in a methane yield of 290 mL g-1 VS, 88.0% higher than that of untreated rice straw. Thus, H2O2 pretreatment of rice straw can be used to improve methane yields during biogas production. © 2013 Chinese Academy of Agricultural Sciences.


Song Z.,Northwest Agriculture and Forestry University | Song Z.,Research Center for Recycling Agricultural Engineering Technology of Shaanxi Province | Yang G.,Northwest Agriculture and Forestry University | Yang G.,Research Center for Recycling Agricultural Engineering Technology of Shaanxi Province | And 8 more authors.
Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering | Year: 2012

Previous studies had shown that the digestibility of the lignocellulosic biomass and methane yield were increased with alkali pretreatment prior to anaerobic fermentation. To increase the economic viability of pretreatment technology and simplify operation, a self-designed laboratory-scale continuous anaerobic biogas digester was used in this study. Anaerobically digested slurry, Ca(OH) 2 pretreatment, and anaerobic digestion were evaluated for biogas production from rice straw. The results showed that the lignin, cellulose and hemicellulose of rice straw were significantly degraded, and all pretreatments promoted biogas production. The Ca(OH) 2 pretreatments exhibited higher biogas production than that of anaerobically digested slurry, and the highest biogas yield was obtained with 8% Ca(OH) 2 treatment, which reached up to 14374 mL, 100.91% higher than that of the control. The results show that rice straw fermentation with Ca(OH) 2 pretreatment has the advantages of simple procedure, low cost and high biogas production. Therefore, pretreatment with lime can be applied in household biogasification of rice and other crop straws.


Song Z.,Northwest University, China | Song Z.,Research Center for Recycling Agricultural Engineering Technology of Shaanxi Province | Yang G.,Research Center for Recycling Agricultural Engineering Technology of Shaanxi Province | Yang G.,Northwest University, China | And 6 more authors.
BioMed Research International | Year: 2013

The lime pretreatment process for rice straw was optimized to enhance the biodegradation performance and increase biogas yield. The optimization was implemented using response surface methodology (RSM) and Box-Behnken experimental design. The effects of biodegradation, as well as the interactive effects of Ca(OH)2 concentration, pretreatment time, and inoculum amount on biogas improvement, were investigated. Rice straw compounds, such as lignin, cellulose, and hemicellulose, were significantly degraded with increasing Ca(OH)2 concentration. The optimal conditions for the use of pretreated rice straw in anaerobic digestion were 9.81% Ca(OH)2 (w/w TS), 5.89 d treatment time, and 45.12% inoculum content, which resulted in a methane yield of 225.3 mL/g VS. A determination coefficient (R2) of 96% was obtained, indicating that the model used to predict the anabolic digestion process shows a favorable fit with the experimental parameters. © 2013 Zilin Song et al.


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.


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.

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