共查询到19条相似文献,搜索用时 62 毫秒
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近年来,全球气候变化使各种极端降雨事件显著增加,导致洪涝灾害频发。鉴于福建省是受洪涝、风暴潮和次生灾害影响频繁的省份之一,基于近60年来福建省18个站点的气象观测数据,运用Mann-Kendall趋势分析、Morlet小波分析等方法分析了福建省降雨时空变化特征。结果表明,福建省年降雨量总体呈不显著增加趋势,增幅达8.11mm/10a,然而暴雨雨量增幅达13.56mm/10a;雨日呈逐渐减少趋势,降雨强度却不断增大,尤其是夏季降雨强度增幅最为明显;沿海的厦门、平潭地区夏季降雨呈显著增多趋势(p<0.05),降雨由东南沿海向西北山区逐渐递增;暴雨和其他等级雨量的空间分布存在较大差异,多发生在西南和东北地区山脉东部的迎风坡。建议福建省应加强极端降水事件增多导致的洪涝灾害及其次生灾害的防范力度。 相似文献
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福建省养殖场大中型沼气工程问题分析及建议 总被引:3,自引:0,他引:3
至2007年底,福建省猪粪沼气潜力占全省畜禽沼气资源总量83.17%,全省养猪场存栏数5000头以下占到了82.56%。对172家规模养猪场进行调查表明:43.02%沼气池容积在500~999m3之间,沼气利用率在30%以下的占到81.49%,大部分沼气排空,造成资源浪费,加剧温室效应。另一方面,沼气利用领域窄、工业化利用水平低。根据这些情况,笔者提出实行环境治理与能源资源开发利用并举方针,鼓励沼气综合利用,加强沼气科研创新和人才培养等建议。 相似文献
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新疆农村有机废弃物资源量概算及沼气潜力分析 总被引:1,自引:0,他引:1
根据2005年新疆农村社会经济统计年鉴数据,计算出新疆每年产生畜禽粪便174.23×106 t,可产沼气72.49亿m3;农作物秸秆量19.85×106t,600%可以用来产沼气,可产沼气23.8亿m3.按新疆250万农户计算,户均可拥有沼气量为3 852 m3,可完全解决农村生活用能.但目前新疆拥有的沼气池数量,远远没体现其应有沼气潜力,应加快新疆农村沼气建设的步伐. 相似文献
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以福建省9地市2015-2019年SO2浓度监测数据为研究对象,将数据按年平均、季平均和月平均值整理,从时间层面和空间层面分析SO2污染的分布特征及变化趋势.结果表明:该省近五年SO2年平均浓度整体呈下降趋势,其中2019年下降幅度最大;从季均值上看呈现出冬季>春季>秋季>夏季的趋势;从月均值上看12月至次年4月SO2... 相似文献
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畜禽养殖场沼气工程建设的思考 总被引:4,自引:0,他引:4
论述了集约化畜禽养殖场粪污对农村生态环境的影响,分析了粪污治理的综合措施,并对关键措施之一--大中型沼气工程技术的产业化发展障碍与问题进行了探讨,提出了建议。 相似文献
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介绍了浙江省沼气技术开发利用的数量、采用的工艺、取得的综合效益及存在的问题,并提出了加快发展沼气利用的发展对策。 相似文献
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调查了我省部分大中型养殖场的基本情况,养殖场粪便污水的处理及利用现状,沼气工程在规模养殖场中的应用现状,以及沼气工程的应用前景等;并对利用沼气工程处理养殖场禽畜粪便的下一步推广工作提出了若干建议。 相似文献
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Elder Geraldo Domingues Tauler Teixeira Borges Wilson Bueno Garces Junio Aylton Jose Alves Wesley Pacheco Calixto Jose Luis Domingos 《能源与动力工程:英文版》2013,(8):1433-1439
This paper presents an economic viability analysis of two investment alternatives for a pig farming located in the city of Jatai, Goias State, Brazil. The first investment alternative consists of the implementation of a biodigester, being the biogas burned in a flare. The second alternative also consists of a biodigester, nevertheless the produced biogas is used to generate electricity. The methodologies to estimate the methane production in anaerobic reactors are presented, as well as those for the quantification of the baseline and project emissions and of the electricity that can be generated. The results showed that the use of biogas for the electricity generation is the alternative more economically viable. 相似文献
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规模养殖粪污经厌氧发酵后产生的沼气和沼液没有充分利用存在严重二污染.针对这一问题,泰华养殖场和南昌大学紧密合作,运用系统工程理论和循环经济等多种理论集成,开发稳定供气工程技术,实现沼气充分利用:创建沼液分流、延迟过滤、自然流好氧、区域内三级储存工程技术,创建五项养种生物链工程技术,实现沼液系统内消化,实现了沼液达标排放.取得了非常好的效果.该开发处理模式结构简单,操作方便,特别适合规模养殖场推广利用,具有重要意义. 相似文献
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A. Berktay B. Nas 《Energy Sources, Part A: Recovery, Utilization, and Environmental Effects》2013,35(2):179-188
Abstract Municipal wastewater treatment plants generate sludge as a by-product of the physical, chemical and biological processes used in the treatment of wastewater. Generally, this sludge must be subject to some form of treatment in order to alter its character. By using anaerobic digestion in the treatment of wastewater sludge, methane gas is produced and it is known as biogas. It must not only be seen as a renewable energy source, but even more as one of the promising solutions to the large environmental problem concerning waste handling, water pollution, CO2 emission, etc. This article presents the biogas generation from wastewater treatment sludge, its energy potential and also its usage in some treatment plants operated in Turkey. Although the estimation of recoverable energy from municipal wastes and sewage is difficult to assess, total recoverable bioenergy potential is estimated as being 16,920 ktoe. Of this, 1,300 ktoe of municipal wastes and sewage whereas biogas production potential is 1.5–2 Mtoe in Turkey. 相似文献
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运用能值分析方法对山东省淄博市畜禽养殖场沼气工程和秸秆发酵沼气工程的投入和产出进行了计算和分析,结果显示:畜禽养殖场沼气工程的生态经济价值为2.38×105$/a,秸秆沼气工程为4.07×105$/a,两种沼气工程均具有很高的生态经济价值。通过能值指标综合对比,评价了淄博市两类沼气工程的效益和可持续发展能力,对比结果表明:畜禽养殖场沼气工程购入能值比率、能值投资率为秸秆沼气工程的0.3倍和0.17倍,自然能值与购入能值比、能值产出率和能值自给率分别是秸秆沼气工程的5.78倍、1.77倍和1.7倍;废弃物处理率是秸秆沼气工程的1.7倍,环境负荷率为秸秆沼气工程的0.2倍;能值反馈率是秸秆沼气工程的52倍,可更新率是秸秆沼气工程的1.44倍,可持续发展指标是秸秆沼气工程的9.25倍。 相似文献
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分析了晋城市环境保护监测站2010年城区5个监测点的PM10监测资料,结果表明晋城市大气污染物PM10污染严重,并存在明显的空间和季节差异。阐述了产生这一现象的原因。 相似文献
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Vincent Okudoh Cristina Trois TilahunWorkneh 《能源与动力工程:英文版》2014,(5):836-843
Cassava is currently being investigated for biogas production in South Africa as it offers multiple benefits such as high yields of starch and total dry matter. The chemical constituents of the cassava biomass were determined using standard methods. Using a locally fabricated laboratory batch fermenter, anaerobic digestion was carried out in a 25 L capacity digester maintained at 36 ± 0.5 ℃. Pre-treatment of the cassava biomass with spoilage fungi, Aspergillus niger and PeniciUium species yielded large amounts of fermentable sugars for digestion. Cassava slurry was made and mixed with zebra droppings (2:1 v/v) and loaded into the digester of 20 L working volume. Analysis results showed an increase in most nutrients after pretreatment except for starch which decreased from 76% to 60% as a result of its hydrolysis to fermentable sugars by the spoilage fungi. Theoretical biogas yields were between 0.71 nm3 and 0.75 nm^3 per kg VS (volatile solids) destroyed while the total biogas yields of between 250 nm^3 and 300 nm^3 per kg VS fed into the digester was obtained after 20 days residence time. Cassava is not yet a staple food in some BRICs countries like South Africa and the peels and other by-products of its processing are equally suitable for energy production. The use of cassava will be an alternative feedstock strategy for several rural biogas projects running with cow dungs inside South Africa. In addition, opportunities exist for decentralized, cheaper and socially advantageous bioenergy production from cassava considering that fuel and electricity needs are not satisfied in many rural areas. Finally, the incorporation of cassava anaerobic digestion facility at different scales will deliver additional benefits like the incorporation of nutrients and residual carbon into the land as fertilizer. 相似文献