排序方式： 共有9条查询结果，搜索用时 415 毫秒
1
1.
Sahar S Dalahmeh Mikael Pell Bj?rn Vinner?s Lars D Hylander Ingrid ?born H?kan J?nsson 《Water, air, and soil pollution》2012,223(7):3657-3671
Greywater is a potential resource of water that can be improved to meet the quality needed for irrigation. This study evaluated the performance of bark, activated charcoal, polyurethane foam and sand filters in removing biochemical oxygen demand (BOD5), surfactants, phosphorus, nitrogen and microbial indicators from greywater during start-up and steady state. In column experiments, 0.6?m high filters (diameter 20?cm) were fed for 113?days with artificial greywater at a hydraulic loading rate of 0.032?m3?m?2?day?1 and an organic loading rate of 0.014?kg BOD5 m?2?day?1. Bark and activated charcoal efficiently reduced the concentrations of organics (BOD5), surfactants (methylene blue active substances??MBAS), total phosphorus (Tot-P) and total thermotolerant coliform numbers, while sand and foam were less efficient. Bark, activated charcoal, foam and sand reduced influent BOD5 by 98, 97, 37 and 75?%; MBAS by >99, >99, 73 and 96?%; Tot-P by 97, 91, 36 and 78?%; and total nitrogen by 19, 98, 13 and 5?%, respectively. BOD5 and MBAS were efficiently reduced directly from start-up by bark and activated charcoal, while foam needed 30?days to achieve about 50?% reduction in BOD5. Bark was the most efficient filter in reducing thermotolerant faecal coliforms (2.4 log10), while foam achieved the lowest reduction (0.5 log10). Overall, bark and activated charcoal filters appeared to be the most suitable filters for improving greywater quality to reach irrigation quality in terms of organic matter reduction. Performance of these filters under higher and fluctuating loadings and the long-term sustainability of the filter materials need further investigation. 相似文献
2.
Ine Dorresteijn Jannik Schultner Neil French Collier Kristoffer Hylander Feyera Senbeta Joern Fischer 《Landscape Ecology》2017,32(11):2151-2165
Context
Cultural landscapes provide essential ecosystem services to local communities, especially in poor rural settings. However, potentially negative impacts of ecosystems—or disservices—remain inadequately understood. Similarly, how benefit–cost outcomes differ within communities is unclear, but potentially important for cultural landscape management.Objectives
Here we investigated whether distinct forest ecosystem service–disservice outcomes emerge within local communities. We aimed to characterize groups of community members according to service–disservice outcomes, and assessed their attitudes towards the forest.Methods
We interviewed 150 rural households in southwestern Ethiopia about locally relevant ecosystem services (provisioning services) and disservices (wildlife impacts). Households were grouped based on their ecosystem service–disservice profiles through hierarchical clustering. We used linear models to assess differences between groups in geographic and socioeconomic characteristics, as well as attitudes toward the forest.Results
We identified three groups with distinct ecosystem service–disservice profiles. Half of the households fell into a “lose–lose” profile (low benefits, high costs), while fewer had “lose–escape” (low benefits, low costs) and “win–lose” (high benefits, high costs) profiles. Location relative to forest and altitude explained differences between the “lose–escape” profile and other households. Socioeconomic factors were also important. “Win–lose” households appeared to be wealthier and had better forest use rights compared to “lose–lose” households. Attitudes towards the forest did not differ between profiles.Conclusions
Our study demonstrates the importance of disaggregating both ecosystem services and disservices, instead of assuming that communities receive benefits and costs homogenously. To manage cultural landscapes sustainably, such heterogeneity must be acknowledged and better understood.3.
Lars D. Hylander 《Water, air, and soil pollution》2001,125(1):331-344
The high toxicity of methyl mercury (MeHg) is well known, as is the existence of transformations between metallic Hg and MeHg. As a consequence the industrialised countries have adopted Hg-free products and processes, because a continued use of Hg would result in diffuse emissions even if used Hg isrecycled. However, Western Europe exports about 100 tons of Hg to Brazil each year, where it is emitted over the Amazon. The export from Europe began during the 1980s, when a gold mining boom spread like wildfire in the Amazon. Mercury agglutinates gold grains by forming an amalgam. Later on the gold is purified from the Hg by heating. The Hg evaporatesinto the air and is subsequently deposited onto land and in surface waters. Another important Hg polluter is China, whichhas increased its burning of coal without appropriate smoke cleaning devices and is also importing considerable amounts of Hg for industrial use and for use in gold mining. RegionalHg emissions contribute to global Hg pollution due to the mobility of Hg. A ban on the Hg trade in Europe and North America would significantly diminish global Hg pollution. A ban would also result in the closing of the state-owned Hg mine (MAYASA) in Almadén, Spain, the world's most important anthropogenic Hg source. 相似文献
4.
5.
Kristoffer Hylander 《Biological conservation》2007,135(3):311-314
6.
Ecologically engineered wastewater treatment facilities, such as constructed wetlands and infiltration plants, can be further improved in their P retention by using reactive media with a high P-retention capacity. In a sustainable system, the sorbed P should be recycled in agricultural production. The objective of the present study was to determine the plant availability of P sorbed to different P-retention media. The studied media were: crystalline and amorphous blast furnace slag, natural and burned opoka (a bedrock from Poland), limestone, burned lime, soil from a spodic B horizon, and light expanded clay aggregates (LECA). They were soaked in a P solution, rinsed and dried before incorporation into soil. An additional aim was to compare P taken up by barley with amounts chemically extracted for the estimation of plant-available soil P. P sorbed to the crystalline slag was delivered to the barley plants more efficiently than P added in K2HPO4 fertiliser. Soil extraction with acid ammonium lactate correlated well with P taken up by barley and indicated that P bound to Ca is more available to plants than P bound to Al and Fe. The Mg content of the used slag may replace Mg fertilisation in certain soils. It was concluded that among the investigated filter materials, crystalline slag was the most suitable sorbent from an agricultural point of view, since it possessed a large P-sorption capacity and the sorbed P was largely plant available. The heavy metal content of sorption materials must be examined carefully before their application to agricultural soils. 相似文献
7.
Koelemeijer Irena A. Ehrl&#;n Johan J&#;nsson Mari De Frenne Pieter Berg Peter Andersson Jenny Weibull Henrik Hylander Kristoffer 《Landscape Ecology》2022,37(7):1839-1853
Landscape Ecology - Both climatic extremes and land-use change constitute severe threats to biodiversity, but their interactive effects remain poorly understood. In forest ecosystems, the effects... 相似文献
8.
Plants grown on Andisols often have an insufficient phosphorus (P) supply, since active aluminium (AI) and iron bind P in low available forms to the plants. The objectives of the present studies were to examine the differences in growth associated with the P-uptake ability among four Gramineae, to determine which P-forms are utilised, and to relate plant growth to the distribution of nutrients in soil close to the roots. Rhizosphere soil was separated from bulk soil by using a rhizobox system. Shoot and root yields and nutrient contents of maize (Zea mays L.), Sorghum bicolor (L.), Brachiaria dictyoneura (Stapf), and upland rice (Oryza sativa L.) were determined after cultivation in rhizoboxes for 105 d. Soil was sampled at increasing distances from the roots and analysed for P compounds, other nutrients, and pH. Maize gave the highest yield by using P reserves in its large seeds, resulting in the greatest depletion of K in the root soil of maize. Brachiaria showed the highest efficiency while upland rice the lowest in using soil P, respectively. The amounts of Bray-2 P and acetic acid-extractable P were significantly lower in root soil compared to bulk soil. Soil pH increased in the root soil of all crops, mainly around the Brachiaria roots. 相似文献
9.
Anders Roos Mikael Lindström Lena Heuts Nippe Hylander Erik Lind Christian Nielsen 《Scandinavian Journal of Forest Research》2014,29(4):394-401
The purpose of this study is to understand the innovation diffusion of new wood-based materials, “from lab to market,” to identify the success factors and barriers to market introduction, and to reveal important factors for the success of commercialization. Examples are given from target markets in the furniture, appliance, and automotive sectors. This study is based on three qualitative interview studies in Sweden from 2010 to 2012. The analysis showed that the diffusion process of a new bio-based material normally takes up to 10 years or even more. There are only a few companies along the supply chain whose specialized function is finding new materials. However, the automotive industry regularly monitors the development of new materials. Industrial customers of materials generally obtain information about biobased materials from suppliers, exhibitions, conferences, professional contacts, industry magazines, digital media, customers, and partners in development projects. Different industry sectors apply specific material requirements. Regulations regarding safety issues have a high priority, and the interviewees believed that environmental considerations will increase with time. If the materials are equal in other quality dimensions, environmental performance may cast the deciding vote. Recommendations for a faster diffusion cover the right mix of competences, financing, regulations, creativity, and support from the leadership. 相似文献
1