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随着我国油气田勘探开发力度加大和新环保法的实施,油田开采过程中耗水量大和污水处理问题是我国油气田企业面临的共同难题。从污水余热回收、污水回注、压裂液重复利用、钻井废水再利用四个方面,介绍了国内油田产出水再利用技术研究进展与应用现状,指出目前存在的污水余热再利用应用范围不广、回注污水利用不合理、化工原料未回收利用等主要问题。并通过文献调研,展望了油田污水再利用技术的发展方向,指出需从污染源头防控入手,研发更加经济环保的液体配方,并深入研究从污水中取热、取水及取化工原料的循环再利用技术,因地制宜制定相应的水质及污水配伍性实验评价标准,实现从源头至末端治理相结合的油田污水清洁生产。 相似文献
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本文综述了塑料减量,再使用,回收再利用,稳定化和可降解等五种环境协调型塑料研究技术途径。其中,塑料回收再利用和可降解技术仍是今后需主要发展的研究开发课题。 相似文献
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农村林产品废弃物是一种潜在的可以回收利用的资源,具有成分复杂、分类粗、杂质多等特点,开展农村林产品废弃物循环利用具有重要的现实意义。以浙江省为例,通过对农村林产品废弃物产量、利用现状的调查和“三环”循环总体发展思路的剖析,提出今后浙江省农村林产品废弃物回收利用应当以循环经济理论为指导,建立健全林产品废弃物回收体系,制订林产品废弃物分类标准和检测方法,加强林产品废弃物循环利用技术研究,出台有利于林产品废弃物循环利用的政策法规。 相似文献
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一、绿色包装的概念绿色包装(GreenPackage)是指可以回收利用的、不会对环境造成污染的包装,体现为资源的再生利用和生态环境保护。1.绿色包装的内涵绿色包装一般应具有5个方面的内涵:一是实行包装减量化(Reduce)。包装在满足保护、方便、销售等功能的条件下,应是用量最少。二是包装应易于重复利用(Reuse),或易于回收再生(Recycle)。通过生产再生制品、焚烧利用热能、堆肥化改善土壤等措施,达到再利用的目的。三是包装废弃物可以降解腐化(Degradable),不形成永久垃圾,进而达到改善土壤的目的。Reduce、Reuse、Recyc… 相似文献
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本文分析了我国氧化镁法脱硫技术中副产品回收的问题,回顾了我国氧化镁脱硫技术的发展历程,提出采用三循环超低排放工艺和催化氧化提浓硫酸镁技术、烟气浓缩和降温结晶技术,在实现超低排放的同时,可有效回收副产品,实现资源化利用。 相似文献
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城郊旅游的潜在市场特征及产品开发--以合肥市为例 总被引:5,自引:1,他引:5
城市郊区已成为旅游的热点区域,合肥市对行政区域进行划分后,正着手大力开发城郊旅游.为了使合肥城郊旅游业的发展更具科学性,在实地调查基础上,分析了合肥城郊旅游潜在的市场特征,得出其城郊旅游开发市场潜力巨大;在分析外来旅游者及市民的城郊旅游意向基础上探讨了合肥城郊旅游产品开发,认为新城郊区旅游功能可定位为水上休闲度假娱乐中心和生态农业观光园区;最后提出合肥城郊旅游科学开发的几点建议. 相似文献
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Despite the fact that virtual environments are increasingly deployed to study the relation between urban planning, physical and social disorder, and fear of crime, their ecological validity for this type of research has not been established. This study compares the effects of similar signs of public disorder (litter, warning signs, cameras, signs of vandalism and car burglary) in an urban neighborhood and in its virtual counterpart on the subjective perception of safety and livability of the neighborhood. Participants made a walking tour through either the real or the virtual neighborhood, which was either in an orderly (baseline) state or adorned with numerous signs of public disorder. During their tour they reported the signs of disorder they noticed and the degree to which each of these affected their emotional state and feelings of personal safety. After finishing their tour they appraised the perceived safety and livability of the environment. Both in the real and in the simulated urban neighborhood, signs of disorder evoked associations with social disorder. In all conditions, neglected greenery was spontaneously reported as a sign of disorder. Disorder did not inspire concern for personal safety in reality and in the virtual environment with a realistic soundscape. However, in the absence of sound disorder compromised perceived personal safety in the virtual environment. Signs of disorder were associated with negative emotions more frequently in the virtual environment than in its real-world counterpart, particularly in the absence of sound. Also, signs of disorder degraded the perceived livability of the virtual, but not of the real neighborhood. Hence, it appears that people focus more on details in a virtual environment than in reality. We conclude that both a correction for this focusing effect and realistic soundscapes are required to make virtual environments an appropriate medium for both etiological (e.g. the effects of signs of disorder on fear of crime) and intervention (e.g. CPTED) research. 相似文献
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Recent developments of safer formulations
of agrochemicals 总被引:2,自引:0,他引:2
Alan Knowles 《The Environmentalist》2008,28(1):35-44
The primary objectives of formulation technology are to optimise the biological activity of the pesticide, and to give a product
which is safe and convenient for use. However, because of the wide variety of pesticide active ingredients which are available,
many different types of formulations have been developed depending mainly on the physico-chemical properties of the active
ingredients. In the past most formulations were based on simple solutions in water (SL), emulsifiable concentrates in a petroleum-based
solvent (EC), or dusts (DP) and wettable powders (WP). The presence of petroleum-based solvents in EC formulations and dusty
powders in DP and WP formulations can lead to safety hazards in use and a negative impact on the envirnoment generally. Most
government and regulatory authorities are now demanding formulations which are cleaner and safer for the user, have minimal
impact on the environment, and can be applied at the lowest dose rate. Developments in formulation technology and novel formulation
types, sometimes in special packaging such as water-soluble packs, can also give products a competitive advantage, add value
or extend the lif-cycle of active ingredients. There is also a demand from government authorities and consumer groups to use
safer formulation additives and adjuvants, and to minimise the residues of pesticides on food crops after spraying. All of
these aspects are putting increasing pressure on the development of improved formulation and adjuvant technologies. Pesticide
formulations for spray application and for seed treatment are discussed, along with developments in bioenchancement. 相似文献
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本文综述了油茶饼粕综合开发利用的工艺方法及其优缺点。结果表明,用单一有机溶剂一步浸取同时提取饼粕中的油脂和茶皂素的新方法,具有工艺简单,设备投资少,产品产量高,质量好且稳定等优点。 相似文献
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Luisa Franzini Margaret O’Brien Caughy Saundra Murray Nettles Patricia O’Campo 《Journal of environmental psychology》2008
Theoretical explanations and empirical evidence of how disorder is perceived and its relation to independently observed measures of disorder are rare. In recent work, Sampson and Raudenbush [2004. Seeing disorder: Neighborhood stigma and the social construction of “Broken Windows”. Social Psychology Quarterly, 67(4), 319–342] investigated how individuals form perceptions of disorder and found that perceptions of disorder in Chicago neighborhoods are shaped not only by observable conditions of disorder, but also by neighborhoods’ racial and socioeconomic composition. In this paper, we investigate the bases for perceiving disorder with data from Baltimore using a methodology similar to that used by Sampson and Raudenbush (2004). Using surveys, systematic social observations, census data, and police records to investigate variations in individual perceptions of disorder at the individual and neighborhood levels, this study, consistent with the literature, finds that visual cues of disorder are not unambiguous and that perceptions of disorder are based not only on neighborhood observed disorder but also on individual characteristics of residents and neighborhood social structure. Additionally, our findings indicate that neighborhood poverty and not neighborhood racial composition affects perceptions of disorder in Baltimore. The fact that these findings are in contrast to the findings in Chicago suggests that the influence of racial segregation on perception of disorder is imbedded in the larger historical context. 相似文献
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Tingting Zhuang 《Natural resources forum》2023,47(3):375-392
How to control the growth of agricultural carbon emissions while developing tourism has become the primary issue that needs addressing in the development of rural China. This paper explores the impact of tourism on agricultural carbon emissions and further analyses the mediating effect of labor transfer in this relationship. The analysis is evaluated using provincial panel data from 31 provinces in China from 2007 to 2019 with a sequential regression model. The results show that tourism development increases agricultural carbon emissions, which is more pronounced in areas with advanced economies or higher education levels. Second, labor transfer to nonfarming industries suppresses the increase in agricultural carbon emissions caused by tourism. Finally, (i) the impact of tourism on labor transfer in less developed and less educated regions is limited, and (ii) there is the expectation of large-scale use of agricultural machinery due to labor transfer in economically developed or highly educated areas. The heterogeneity test shows these two reasons lead to a mediating effect of labor transfer on agricultural carbon emissions in different regions. 相似文献
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YSI 6600-V2多功能水质自动监测仪采用荧光原理快速测定水体中浮游植物蓝绿藻的密度,梅梁湖夏季水华高发期时,湖体中的浮游植物几乎全部是蓝绿藻。传统的浮游植物监测前处理方面就需要24~48 h,最终要数天后才有镜检结果,导致浮游植物数据滞后,不能很好的应用到预警监测中。通过比对相关性验证,保证荧光法数据的可信度,提高工作效率,为预警监测提供有力的支持。 相似文献