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淮河流域水污染治理全线启动方洲TacklingWaterPollutionintheHuaiheRiverBasinStartsonAllFrontsTownshipindustryintheHuaiheRiverBasin,whichistheth... 相似文献
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工业燃煤锅炉大气污染物控制技术POLLUTIONCONTROLFORINDUSTRIALCOAL-FIREDBOILERSSignificantprogresshasbeenmadeincontrollingairpollution(e.g.part... 相似文献
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新型除尘滤袋材料──P_(84)及其复合滤料NEW FILTERBAGMATERIAL──P_(84)ANDITSCOMPOSITEFILTERINGMEDIUMAnewfilterbagmaterial──P_(84)anditscomposite... 相似文献
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比利时首都布鲁塞尔是欧盟总部所在地,通过欧盟规划处官员ARNAULT的安排,1998年7月30日,我们到欧盟环境部进行了访问。行前,环境、核安全处负责人NicholasBANFIELD先生的秘书为我们作了周到的安排,BANFIELD先生本人还在电话里详细地介绍了环境部大楼的方位。7月30日下午,按照他的介绍,我们顺利地到达了欧盟环境部的办公地点,BANFIELD在他的办公室里热情地接待了我们。因为我们是首次来到欧盟环境部的客人,他首先向我们介绍了欧盟机构的设置和环境部的主要工作。他说,欧盟环境部是欧盟机构调整后成立… 相似文献
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工业燃煤锅炉大气污染物控制技术(续)POLLUIONCONTROLFORINDUSTRIALCOAL-FIREDBOILERS(cont.)三、so2排放控制煤中含硫量多少决定SO2的排放量,因为只有一小部分硫在燃烧后仍残留在煤灰中。目前工业锅炉SO... 相似文献
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/ To understand the total impact of humans on the carbon cycle, themodeling and quantifying of the transfer of carbon from terrestrial pools tothe atmosphere is becoming more critical. Using previously published data,this research sought to assess the change in carbon pools caused by humans inthe Lower Fraser Basin (LFB) in British Columbia, Canada, since 1827 anddefine the long-term, regional contribution of carbon to the atmosphere. Theresults indicate that there has been a transfer of 270 Mt of carbon frombiomass pools in the LFB to other pools, primarily the atmosphere. The majorlosses of biomass carbon have been from logged forests (42%), wetlands(14%), and soils (43%). Approximately 48% of the forestbiomass, almost 20% of the carbon of the LFB, lies within old-growthforest, which covers only 19% of the study area. Landfills are nowbecoming a major sink of carbon, containing 5% of the biomass carbonin the LFB, while biomass carbon in buildings, urban vegetation, mammals, andagriculture is negligible. Approximately 26% of logged forest biomasswould still be in a terrestrial biomass pool, leaving 238 Mt of carbon thathas been released to the atmosphere. On an area basis, this is 29 times theaverage global emissions of carbon, providing an indication of the pastcontributions of developed countries such as Canada to global warming andpossible contributions from further clearing of rainforest in both tropicaland temperate regions.KEY WORDS: Carbon pools; Global warming; Carbon release to atmosphere;Greenhouse effect 相似文献
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Changes in Land Cover and Subsequent Effects on Lower Fraser Basin Ecosystems from 1827 to 1990 总被引:2,自引:0,他引:2
/ European settlement began in the Lower Fraser Basin (LFB) inwestern British Columbia in 1827 and has impacted the basin ecosystem in anumber of ways, especially affecting the vegetation. Using previouslypublished data, air photos, and other historical material for the area,estimates of land cover were made for the years prior to 1827 and for 1930and 1990. The area of coniferous forest changed from 71% prior to 1827to 50% in 1930 to 54% in 1990. However, prior to 1827, only27% of the forest would have been immature (<120 years old), while40% would have been immature in 1930 and 73% of the forest wasimmature in 1990. The amount of wetland area decreased from 10% to1% of the study area while urban and agricultural area increased to26% of the study area by 1990. The changes in land cover have hadadverse effects on soil, water, and air quality; aquatic life; and plant andanimal populations. Estimates of changes in net primary production andorganic soil carbon suggest a decline over the past 170 years, although thelatter rate of decrease has slowed since 1930. As human populations in theLower Fraser Basin continue to increase, the quality of air, water, and soilwill continue to decline unless measures are taken.KEY WORDS: Human impact; Land cover; Net primary productivity; Organiccarbon in soil 相似文献
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The environmental performance of hemp based natural fiber mat thermoplastic (NMT) has been evaluated in this study by quantifying carbon storage potential and CO2 emissions and comparing the results with commercially available glass fiber composites. Non-woven mats of hemp fiber and polypropylene matrix were used to make NMT samples by film-stacking method without using any binder aid. The results showed that hemp based NMT have compatible or even better strength properties as compared to conventional flax based thermoplastics. A value of 63 MPa for flexural strength is achieved at 64% fiber content by weight. Similarly, impact energy values (84–154 J/m) are also promising. The carbon sequestration and storage by hemp crop through photosynthesis is estimated by quantifying dry biomass of fibers based on one metric ton of NMT. A value of 325 kg carbon per metric ton of hemp based composite is estimated which can be stored by the product during its useful life. An extra 22% carbon storage can be achieved by increasing the compression ratio by 13% while maintaining same flexural strength. Further, net carbon sequestration by industrial hemp crop is estimated as 0.67 ton/h/year, which is compatible to all USA urban trees and very close to naturally, regenerated forests. A comparative life cycle analysis focused on non-renewable energy consumption of natural and glass fiber composites shows that a net saving of 50 000 MJ (3 ton CO2 emissions) per ton of thermoplastic can be achieved by replacing 30% glass fiber reinforcement with 65% hemp fiber. It is further estimated that 3.07 million ton CO2 emissions (4.3% of total USA industrial emissions) and 1.19 million m3 crude oil (1.0% of total Canadian oil consumption) can be saved by substituting 50% fiber glass plastics with natural fiber composites in North American auto applications. However, to compete with glass fiber effectively, further research is needed to improve natural fiber processing, interfacial bonding and control moisture sensitivity in longer run. 相似文献
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Gopal Kaliyaperumal Mukilarasan Nedunchezhiyan Poyyamozhi Natesan Melvin Victor De Poures Sivanantham Arunachalam Venkatesh Rathinavelu Naveen Subbaiyan 《环境质量管理》2023,33(1):165-171
Insists of polymer matrix composite is prepared by using natural fiber facilitates high tensile, flexural, and impact toughness properties. The natural fiber utilization in the polymer matrix can overcome the synthetic fiber demerits of poor compatibility, high moisture absorption, and high cost. The present research investigates developing a low-cost, environmentally eco-friendly epoxy hybrid composite using different volume percentages of chopped natural waste banana (0Vol%, 5Vol%, 10Vol%, and 15Vol%) and sisal fiber (0Vol%, 15Vol%, 10Vol%, and 5Vol%) through hand mould hot compression technique. The presence of natural waste banana and sisal fiber on tensile strength, flexural strength, and thermal adsorption properties of the epoxy hybrid composite are evaluated by ASTM test standards. The ASTM standard measured test results of epoxy hybrid composite with and without natural waste banana and sisal fiber were compared and sample three was identified by good tensile strength, flexural strength, and better thermal adsorption properties compared to all others. The sample three epoxy hybrid sample is recommended for automotive roof application. 相似文献
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分析了我国干法腈纶废水的来源、特点,介绍了干法腈纶废水处理技术的研究进展,并就其未来的研究方向提出了建议. 相似文献