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331.
Carmen Echebarria Jose M. Barrutia Ainhize Eletxigerra Patrick Hartmann Vanessa Apaolaza 《Journal of Environmental Planning and Management》2018,61(8):1289-1317
This article presents a systematic literature review of 109 articles (1992–2015) dealing with Local Agenda 21 processes worldwide. It analyzes two essential elements of Local Agenda 21: (1) the holistic approach of the sustainable development concept and (2) the main driving forces behind such processes. It shows that, although at the beginning, sustainability was seen as a natural extension of environmental policy work, it has been perceived over recent years as a guiding principle applied to issues of environment, economic development, and social welfare, and Local Agenda 21 is perceived as a coherent approach to sustainability planning. In addition, Local Government Strategy is the main typology followed, although it suffers from important limitations. Future studies could focus on local sustainability process outcomes. Further quantitative studies would be welcome, given the qualitative case study dominance in the field. We conclude with a research agenda to tackle theoretical, methodological, and empirical lacunae. 相似文献
332.
Treatment of effluent from re‐refined lubricating oils by combined processes of coagulation,flocculation, and Fenton process
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Lucas Pisoni da Silva Silvio Roberto Taffarel Fernanda Rosa da Silveira Fagner Tafarel Campos de Sá Luís Felipe Silva Oliveira 《环境质量管理》2018,27(4):135-141
This work examines the possibility and the potential application of physicochemical processes (coagulation and flocculation) and advanced oxidative processes (Fenton Process) in the treatment of effluents from the re‐refining of used lubricating oils. 相似文献
333.
Eric W. Larsen Alexander K. Fremier Evan H. Girvetz 《Journal of the American Water Resources Association》2006,42(4):1063-1075
ABSTRACT: Flow regulation impacts the ecology of major rivers in various ways, including altering river channel migration patterns. Many current meander migration models employ a constant annual flow or dominant discharge value. To assess how flow regulation alters river function, variable annual flows ‐ based on an empirical relationship between bank erosion rates and cumulative effective stream power ‐ were added into an existing migration model. This enhanced model was used to evaluate the potential geomorphic and ecological consequences of four regulated flow scenarios (i.e., different hydrographs) currently being proposed on the Sacramento River in California. The observed rate of land reworked correlated significantly with observed cumulative effective stream power during seven time increments from 1956 to 1975 (r2= 0.74, p = 0.02). The river was observed to rework 3.0 ha/yr of land (a mean channel migration rate of 7.7 m/yr) with rates ranging from 0.8 ha/yr to 5.1 ha/yr (2.0 to 13.3 m/yr), during the analyzed time periods. Modeled rates of land reworked correlated significantly with observed rates of land reworked for the variable flow model (r2= 0.78, p = 0.009). The meander migration scenario modeling predicted a difference of 1 to 8 percent between the four flow management scenarios and the base scenario. 相似文献
334.
ABSTRACT. Water development planning has virtually since its beginnings over one hundred fifty years ago utilized a variety of devices for involving segments of the public. But a new insistence for increased public participation, particularly at the Federal level, has stimulated re-examination of objectives and methods for relating water planning to citizen interests and preferences. Involved is partly a recommitment to democratic symbols, partly a recognition that segments of society have been overlooked, and partly a reaction to the pressures of confrontation and demonstration. The rhetoric and polemics of participation have often implied a kind of “town-meeting” process of decision, difficult at best in a nation of 200 million. In water planning more emphasis has been placed on listening to citizens, which has meant providing opportunities for influentials to express their views and preferences. A more adequate approach would seem to require identification of all who are significantly affected by plans and proposals (even though they may not perceive then-interest). But gaining greater participation does not make the planning job easier. It may increase tension and conflict; it may require difficult choices; and it can alter existing power relationships and generate changes with considerable consequences for the agency and its programs. 相似文献
335.
336.
水利枢纽工程作用于环境与生态最集中的外部效应为干扰水文与生态过程。简要介绍了云南省香格里拉小中甸水利枢纽工程和所在的金沙江一级支流硕多岗河流域概况,基于工程对硕多岗河的水文与生态过程的干扰机理,预测了工程对坝址上下游的水文过程和生态过程的影响,为针对性地开发本工程合适的生态与环境措施提供了科学的依据。研究结论对高海拨典型生态敏感区域的水利水电环评的水文与生态影响预测理论与技术具有参考意义。 相似文献
337.
文章进行了UV/H2O2/GAC和GAC系统用于微污染水深度处理的试验研究,结果表明:UV/H2O2/GAC对uV篮;和TOC均有良好的去除效果,当H2O2投量3.0mg/L,UV/H2O2反应器停留时间20min时,系统的COD和UV254去除率为44.6%和72.8%。UV/H2O2主要作用在于改善了GAC对有机物的吸附,产生了羟基自由基,从而提高了去除效果。 相似文献
338.
Ecological modelling has not yet received from basic “hard” sciences, like conventional physics and chemistry, an adequate conceptual support. Mechanistic simulation techniques are very far from achieving a satisfactory understanding of ecosystem dynamics. 相似文献
339.
Summary. Nickel hyperaccumulator plants contain unusually elevated levels of Ni (>1,000 mg Ni kg−1). The high Ni concentration of hyperaccumulator tissues may affect ecosystem processes such as decomposition, but this has
yet to be studied under field conditions. We used Senecio coronatus Thunb. (Harv.) from two pairs of serpentine sites: one member of each pair contained a hyperaccumulator population and the
other a non-hyperaccumulator population. Our main goal was to determine if leaf Ni status (hyperaccumulator or non-hyperaccumulator)
affected leaf decomposition rate on serpentine sites. We also used a non-serpentine site on which leaves from all four S. coronatus populations were placed to compare decomposition at a single location. Dried leaf fragments were put into fine-mesh (0.1 mm)
nylon decomposition bags and placed on field sites in mid-summer (early February) 2000. Sets of bags were recovered after
1, 3.5, and 8 months, their contents dried and weighed, and the Ni concentration and total Ni content of high-Ni leaves was
measured. For the serpentine sites, there was no significant effect of leaf Ni status or site type on decomposition rates
at 1 and 3.5 months. By 8 months, leaf Ni status and site type significantly influenced decomposition on one pair of sites:
hyperaccumulator leaves decomposed more slowly than non-hyperaccumulator leaves, and leaves of both types decomposed more
slowly on the non-hyperaccumulator site. At the non-serpentine site, the highest-Ni leaves (15,000 mg Ni kg−1) decomposed more slowly than all others, but leaves containing 9,200 mg Ni kg−1 did not decompose more slowly than non-hyperaccumulator leaves. Nickel in decomposing hyperaccumulator leaves was released
rapidly: after 1 month 57–68% of biomass was lost and only 9–28% of original Ni content remained. We conclude that very high
(>10,000 mg Ni kg−1) leaf Ni concentrations may slow decomposition and that Ni is released at high rates that may impact co-occurring litter-
and soil-dwelling organisms. 相似文献
340.
抗生素抗性基因(ARGs)由于其广泛的传播与转移,成为日益严峻的环境问题。污水处理厂(WWTP)被公认为ARGs的主要来源之一。膜生物反应器(MBR)是一种新型污染物去除工艺。在一个具有传统生物处理和膜系统处理的城镇污水处理系统的进水中,检出17种ARGs,并首次检出甲氧苄啶类ARGs。进水中sulΙ基因的绝对丰度最高,随后依次是tet C、sulⅡ、tet W、dfr A1、flo R和dfr A13基因。不同的处理系统去除同一种ARGs效果各不相同,MBR对ARGs去除效果显著优于传统生物处理工艺,同一个处理系统处理不同类ARGs,四环素类ARGs被去除的效果显著优于其他ARGs被去除的效果,绝对丰度下降了3.8个数量级。ARGs没有真正意义上的去除,只是从水体转移到污泥中,污泥中的ARGs不断积累。 相似文献