全文获取类型
收费全文 | 123篇 |
免费 | 2篇 |
国内免费 | 6篇 |
专业分类
安全科学 | 4篇 |
废物处理 | 31篇 |
环保管理 | 16篇 |
综合类 | 51篇 |
基础理论 | 1篇 |
污染及防治 | 22篇 |
评价与监测 | 5篇 |
社会与环境 | 1篇 |
出版年
2023年 | 1篇 |
2021年 | 1篇 |
2020年 | 3篇 |
2019年 | 1篇 |
2018年 | 1篇 |
2017年 | 2篇 |
2016年 | 2篇 |
2015年 | 1篇 |
2014年 | 19篇 |
2013年 | 11篇 |
2012年 | 3篇 |
2011年 | 7篇 |
2010年 | 3篇 |
2009年 | 3篇 |
2008年 | 8篇 |
2007年 | 11篇 |
2006年 | 9篇 |
2005年 | 7篇 |
2004年 | 7篇 |
2003年 | 3篇 |
2002年 | 1篇 |
2001年 | 7篇 |
2000年 | 4篇 |
1999年 | 5篇 |
1998年 | 4篇 |
1997年 | 3篇 |
1996年 | 1篇 |
1995年 | 1篇 |
1992年 | 2篇 |
排序方式: 共有131条查询结果,搜索用时 15 毫秒
31.
为改进现有二滩库区垃圾处理填埋场垃圾渗滤液处理工艺,研究絮凝—吸附法预处理工艺,试验以聚合氯化铝作为絮凝剂,最佳投放量为600mg/L,以粉煤灰作为吸附剂,最佳投放量为200g/L。结果表明:CODcr去除率达到79.64%;NH3-N去除率达到83.23%;悬浮物去除率达到58.75%;色度去除率达到92.56%;重金属离子去除率为60.37%~96.33%;研究证明:渗滤液经预处理后可以与城市生活污水合并处理。 相似文献
32.
The market place is considered to be an important centre of daily life of campus community. In India, as in Europe and the
USA, other forms of shopping have emerged significantly and now predominate, for instance department stores and supermarkets.
Though, it is suffered from poor waste management, but the place could be a potential source for obtaining non-conventional
energy. The present study examined the quality of market waste management of the Indian Institute of Technology Campus along
with the feasibility of biogas production from leachate generated in the waste. Solid wastes from different storage locations
of the market place were collected and analyzed. The characteristics of solid wastes were found to be degradable in nature.
The wastes, composed of 85% of vegetable origin, were placed in a container and water was added to to generate leachate. The
self-purification efficiency of leachate was also studied in the Indian environment and compared with research findings in
the USA under an identical moisture application rate. Leachate characterization was investigated both under saturated and
submerged conditions. The treatability of leachate was studied in a laboratory-scale up-flow anaerobic filter with hollow
burnt clay rings as packing media. It was observed that 4,000–6,000 mg/l would be the optimum range of inlet chemical oxygen
demand (COD) concentration for leachate treatment because of the inhibitory effect of ammonia, sulphide, volatile fatty acids
and toxic metals in high concentrations at higher strengths of leachate. The gas production rate was found to be at a maximum
at 38°C and containing 70–75% methane. From experimental data, it was revealed that 83% COD was removed with input COD concentration
of 5,475 mg/l at 2 days hydraulic retention time with biogas yield coefficients of 0.61. The present study also investigated
the removal efficiency of chloride, ammonia, sulphide and nitrate. 相似文献
33.
Twining JR Hughes CE Harrison JJ Hankin S Crawford J Johansen M Dyer L 《Journal of environmental radioactivity》2011,102(6):551-558
The results of a 21 month sampling program measuring tritium in tree transpirate with respect to local sources are reported. The aim was to assess the potential of tree transpirate to indicate the presence of sub-surface seepage plumes.Transpirate gathered from trees near low-level nuclear waste disposal trenches contained activity concentrations of 3H that were significantly higher (up to ∼700 Bq L−1) than local background levels (0-10 Bq L−1). The effects of the waste source declined rapidly with distance to be at background levels within 10s of metres. A research reactor 1.6 km south of the site contributed significant (p < 0.01) local fallout 3H but its influence did not reach as far as the disposal trenches.The elevated 3H levels in transpirate were, however, substantially lower than groundwater concentrations measured across the site (ranging from 0 to 91% with a median of 2%). Temporal patterns of tree transpirate 3H, together with local meteorological observations, indicate that soil water within the active root zones comprised a mixture of seepage and rainfall infiltration. The degree of mixing was variable given that the soil water activity concentrations were heterogeneous at a scale equivalent to the effective rooting volume of the trees. In addition, water taken up by roots was not well mixed within the trees. Based on correlation modelling, net rainfall less evaporation (a surrogate for infiltration) over a period of from 2 to 3 weeks prior to sampling seems to be the optimum predictor of transpirate 3H variability for any sampled tree at this site.The results demonstrate successful use of 3H in transpirate from trees to indicate the presence and general extent of sub-surface contamination at a low-level nuclear waste site. 相似文献
34.
Varank G Demir A Yetilmezsoy K Bilgili MS Top S Sekman E 《Waste management (New York, N.Y.)》2011,31(11):2263-2274
One-dimensional (1D) advection–dispersion transport modeling was conducted as a conceptual approach for the estimation of the transport parameters of fourteen different phenolic compounds (phenol, 2-CP, 2-MP, 3-MP, 4-MP, 2-NP, 4-NP, 2,4-DNP, 2,4-DCP, 2,6-DCP, 2,4,5-TCP, 2,4,6-TCP, 2,3,4,6-TeCP, PCP) and three different inorganic contaminants (Cu, Zn, Fe) migrating downward through the several liner systems. Four identical pilot-scale landfill reactors (0.25 m3) with different composite liners (R1: 0.10 + 0.10 m of compacted clay liner (CCL), Le = 0.20 m, ke = 1 × 10−8 m/s, R2: 0.002-m-thick damaged high-density polyethylene (HDPE) geomembrane overlying 0.10 + 0.10 m of CCL, Le = 0.20 m, ke = 1 × 10−8 m/s, R3: 0.002-m-thick damaged HDPE geomembrane overlying a 0.02-m-thick bentonite layer encapsulated between 0.10 + 0.10 m CCL, Le = 0.22 m, ke = 1 × 10−8 m/s, R4: 0.002-m-thick damaged HDPE geomembrane overlying a 0.02-m-thick zeolite layer encapsulated between 0.10 + 0.10 m CCL, Le = 0.22 m, ke = 4.24 × 10−7 m/s) were simultaneously run for a period of about 540 days to investigate the nature of diffusive and advective transport of the selected organic and inorganic contaminants. The results of 1D transport model showed that the highest molecular diffusion coefficients, ranging from 4.77 × 10−10 to 10.67 × 10−10 m2/s, were estimated for phenol (R4), 2-MP (R1), 2,4-DNP (R2), 2,4-DCP (R1), 2,6-DCP (R2), 2,4,5-TCP (R2) and 2,3,4,6-TeCP (R1). For all reactors, dispersion coefficients of Cu, ranging from 3.47 × 10−6 m2/s to 5.37 × 10−2 m2/s, was determined to be higher than others obtained for Zn and Fe. Average molecular diffusion coefficients of phenolic compounds were estimated to be about 5.64 × 10−10 m2/s, 5.37 × 10−10 m2/s, 2.69 × 10−10 m2/s and 3.29 × 10−10 m2/s for R1, R2, R3 and R4 systems, respectively. The findings of this study clearly indicated that about 35–50% of transport of phenolic compounds to the groundwater is believed to be prevented with the use of zeolite and bentonite materials in landfill liner systems. 相似文献
35.
Tire wear particles (TWP) abraded from end-of-life passenger car tires have been added at a concentration of 1 g L−1 to river water, sea water and mixtures thereof in order to examine the chemical controls on the leaching of Zn from the rubber matrix. Results of time-dependent experiments conducted over a period of 5 days were consistent with a diffusion controlled leaching mechanism with rate constants of about 0.04 mg L−1 h−1/2 in river water and between about 0.02 and 0.03 mg L−1 h−1/2 in sea water. Additional experiments revealed a reduction in Zn dissolution with both increasing salinity and pH and enhancement of leaching in the presence of fluorescent light compared with dark conditions. In corresponding experiments conducted in the presence of a fixed quantity (0.8 g L−1) of clean, fractionated estuarine sediment, aqueous Zn concentrations were reduced by at least an order of magnitude. Increasing the quantity of sediment resulted in a progressive reduction in Zn concentration until an apparent equilibrium was achieved, with partition coefficients defining the sediment-water distribution of Zn of about 550 mL g−1 and 270 mL g−1 in river water and sea water, respectively. Results are interpreted in terms of the dissolution of ZnO and other residual complexes from the matrix and the subsequent, rapid adsorption of Zn2+ ions to coexistent estuarine sediment. The findings of the study are discussed in terms of their implications for the transport, fate and effects of TWP Zn in aquatic environments that are likely to receive urban runoff. 相似文献
36.
Particle-facilitated lead and arsenic transport in abandoned mine sites soil influenced by simulated acid rain 总被引:1,自引:0,他引:1
The role of acid rain in affecting Pb and As transport from mine tailings was investigated by pumping simulated acid rain at a infiltration rate of 10.2 cm/h through soil columns. Simulated acid rain with pH of 3.0, 4.5 and 5.6 were used as leaching solutions. Results showed that 86.9–95.9% of Pb and 90–91.8% of As eluted from the columns were adsorbed by particles in the leachates. Scanning electron microscopy (SEM) analysis showed that particles released from the columns were mainly composed of flocculated aggregates and plate or rod shaped discrete grains. Transmission electron microscopy (TEM) coupled with energy dispersive X-ray analysis (EDX) showed that these particles were predominantly silicate minerals. Results from our experiments demonstrated that when rapid infiltration conditions or a rainstorm exist, particle-facilitated transport of contaminants is likely to the dominant metal transport pathway influenced by acid rain. 相似文献
37.
This paper uses the findings from a column study to develop a reactive model for exploring the interactions occurring in leachate-contaminated soils. The changes occurring in the concentrations of acetic acid, sulphate, suspended and attached biomass, Fe(II), Mn(II), calcium, carbonate ions, and pH in the column are assessed. The mathematical model considers geochemical equilibrium, kinetic biodegradation, precipitation-dissolution reactions, bacterial and substrate transport, and permeability reduction arising from bacterial growth and gas production. A two-step sequential operator splitting method is used to solve the coupled transport and biogeochemical reaction equations. The model gives satisfactory fits to experimental data and the simulations show that the transport of metals in soil is controlled by multiple competing biotic and abiotic reactions. These findings suggest that bioaccumulation and gas formation, compared to chemical precipitation, have a larger influence on hydraulic conductivity reduction. 相似文献
38.
Kunichika?NakamiyaEmail author Tohru?Furuichi Kazuei?Ishii Ikuo?Souda 《Journal of Material Cycles and Waste Management》2004,6(1):35-40
The degradation rate of dioxins added to the activated sludge from a leachate treatment plant of a landfill under denitrification conditions was estimated using six bioreactors. Over 99% of the added dioxins (600ng) were degraded within 7 days. Furthermore, continuous cultivation was carried out for 1 month. The activated sludge degraded 600ng of dioxins (that is, all of the added dioxins) placed in each reactor every 7 days, and this activity was maintained for 35 days. Under aerobic conditions with this sludge, the dioxins were not degraded in 7 days, but 90% of the 600ng of dioxins was degraded in 35 days. The high level of activity observed in the present study may only occur under anaerobic conditions, especially under denitrifying conditions. 相似文献
39.
Jun Yoshinaga Akiko Kida Osami Nakasugi 《Journal of Material Cycles and Waste Management》2001,3(1):60-65
Boron has been found in high concentrations in leachates from landfills located throughout Japan. However, the source(s) of
boron in the leachates, i.e., what kind of waste(s) releases this element into the leachate, has not been clarified. In this
study, boron concentrations in leachates from 48 industrial landfills were evaluated, in relation to the categories of waste
constituting the landfill in each of the sites, by multiple regression analysis. The multiple regression analyses were carried
out using the log-transformed boron concentration as a dependent variable and each of 19 categories of industrial waste (according
to the Japanese Waste Disposal and Public Cleansing Law) as independent variables. Stepwise variable selection was employed
in the analyses. Although the significant variable(s) selected varied according to the data sets analyzed (viz., data sets from least controlled landfill sites, from controlled landfill sites, and from both), cinders, slag, and waste
plastics emerged as wastes with positive partial regression coefficients that significantly explained the boron levels in
the leachates. These results indicated that cinders, slag, and waste plastics were the sources of high concentrations of boron
in the leachates. The results of the present exploratory statistical analyses warrant a systematic survey of the boron contents
of, and leachability from, cinders, slag, and waste plastics.
Received: January 17, 2000 / Accepted: July 24, 2000 相似文献
40.
垃圾渗滤液生物处理出水臭氧氧化的研究 总被引:3,自引:1,他引:2
对垃圾渗滤液生物处理出水进行了臭氧氧化的研究。研究表明,随着氧化时间的延长,CODCr去除率增大;在碱性条件下进行臭氧氧化。pH越高,CODCr去除效率越高。采用BOD5/CODCr来表征垃圾渗滤液的生物降解性,研究了臭氧氧化前后垃圾渗滤液生物处理出水的生物降解性变化规律,表明臭氧氧化可以提高垃圾渗滤液生物处理出水的生物降解性,但提高的幅度不大。通过色谱-质谱法(GC—MC)对臭氧氧化前后垃圾渗滤液的成分进行分析,结果表明,臭氧氧化前后废水中的主要成分没有发生变化,仍然为难降解物质;臭氧氧化使废水中的部分物质发生了结构上的变化,减少、消失和生成的物质多为可降解物质。 相似文献