EGSB工艺处理淀粉废水及沼气高值利用

采用EGSB-A/O工艺处理高浓度的淀粉废水并对沼气进行净化提纯.在消化温度为35℃的条件下,EGSB反应器稳定运行COD容积负荷达到20 kg" m3·d-1,污水处理整体工艺对废水中COD、BOD5和SS去除率分别达98.5％、99.5％、和95％,出水水质满足当地排放要求.沼气经过净化提纯后,甲烷含量达到98％、...     

水葫芦发酵产气潜力的实验研究

介绍了以水葫芦为实验原料，在25℃环境下，采用批量发酵的工艺，进行发酵产沼气实验。实验结果表明，水葫芦可以作为沼气发酵原料，其产沼气潜力为634mL／gTS或834mL／gVS。     

浅析当前农村沼气推广中面临的几个新问题

本文针对当前农村发生的一些新变化，论述了这些变化对沼气推广的影响，并提出了相应的应变措施。     

一种新型反应器——生物气射流循环厌氧流化床的启动与运行特性

A novel anaerobic reactor, jet biogas inter-loop anaerobic fluidized bed （JBILAFB）, was designed and constructed. The start-up and performance of the reactor was investigated in the Process. of .artificial glucose wastewater treatment. With the wastewater recycle ratio of 2.5 ： 1, the recycled wastewater with biogas could mix sludge and wastewater in the JBILAFB reactor completely. The start-up of the JBILAFB reactor could be completed in less than 70 d through maintenance of hydraulic retention time （HR~I＂） and stepwise increase of feed total organic carbon （TOC） concentration. After the start-up, with the volumetric TOC loadings of 14.3 kg·m ^-3·d^-1, the TOC removal ratio, the effluent pH, and the volatile fatty acids （VFA）/alkalinity of the JBILAFB reactor were more than 80%, close to 7.0 and less than 0.4, respectively. Moreover, CH4 was produced at more than 70% of the theoretical value, The reactor exhibited high stability under the condition of high volumetric TOC loading. Sludge granules in the JBILAFB reactor were developed during the start-up and their sizes were enlarged with the stepwise increase of volumetric TOC loadings from 0.8 kg.m^-3.d ^-1 to 14.3 kg.m^-3.d^-1. Granules, an offwhite color and a similar spherical shape, were mainly comprised of global-like bacteria. These had good methanogenic activity and settleability, which were formed probably through adhesion of the bacteria. Some inorganic metal compounds such as Fe, Ca, Mg, Al, etc. were advantageous to the formation of the granules.     

我国城市污水厂污泥厌氧消化系统的运行现状

对我国400余座城市污水厂污泥处理工艺的调查表明,目前采用污泥厌氧消化工艺的仅46家,主要采用浓缩／中温厌氧／脱水工艺,采用一级厌氧消化和二级厌氧消化的厂家数量接近,其中仅25家的污泥消化系统正在运行,沼气产量约为14×10^4m^3／d,另有6家在调试。污泥厌氧消化工艺在实际应用中仍存在着较多亟待解决的问题,沼气产率低和利用率不高大大削弱了该工艺的优势。     

新型农村住宅的节能策略

基于目前我国农村住宅节能的现状,对多种节能技术进行阐述,说明了农村住宅建筑节能已成为全国关注的重点。结合实例列举出适合农村特定环境下的住宅节能策略,提出现阶段农村在推广节能住宅过程中所存在的问题及其未来发展前景。     

污水处理厂沼气发电的经济性分析

介绍了法国2006年颁布的沼气利用政府法令以及沼气发电的价格体系,并以法国南部某污水处理厂为例,分析了污水处理厂利用污泥厌氧消化产生的沼气进行发电的技术经济可行性.研究表明,沼气发电在经济上完全可行,可在3年左右收回投资成本;选择适当功率的发电机,沼气发电后的余热还能保证消化池的正常运行,每处理1 m3污水产生的电能达0.191 kW·h.此外,结合我国现有沼气发电的成功经验,指出污水处理厂的污泥采取厌氧消化、沼气发电进行综合利用,具有良好的发展前景.     

Effect of total solids and agitation time on biogas yield,using rice husk

The rice husk contains a high amount of organic matter, which is broken down by microbial activity using anaerobic digestion, yielding biogas. The various percentages of total solids (Ts) concentration of rice straw effect of agitation time, pH, temperature and effectiveness of microorganisms in the decomposition process were studied in order to determine the conditions for an optimum biogas yield. A floating dome anaerobic digester wasutilised, which contains different percentages of the Ts, and the biogas yield is monitored directly by a digital gas flow meter. It is observed that the amount of biogas yield generated for 10% Ts, 20% Ts and 30% Ts was 1.13, 1.25 and 1.03?m³, respectively. The result shows that 20% Ts concentration and 15?min agitation time and pH of 7.2 had the maximum biogas yield.     

Three dimensional CFD modeling and experimental validation of an electrolyte supported solid oxide fuel cell fed with methane-free biogas

In the present study a comprehensive numerical model of a planar cross-flow electrolyte-supported solid oxide fuel cell (SOFC) is reported. This model is solved in a 3D environment using COMSOL Multiphysics software. To verify the simulation results, an experimental set-up of a six-cell stack was built. Cell temperature and current–voltage measurements are used for validation of the simulation results. Good agreement between the simulation results and the experimental measurements is achieved. Temperature validation in addition to the popular current/voltage validation ensures that the model performs well in predicting local processes like chemical reactions. In this study methane-free biogas (CO₂ + H₂) is fed to the SOFC, and the performance of the system is investigated and explained. It is concluded that the methane-free biogas reduces the cooling air flow due to endothermic reverse water gas shift reaction and gives better current density distribution over the cell compared to hydrogen.