全文获取类型
收费全文 | 1693篇 |
免费 | 20篇 |
国内免费 | 139篇 |
专业分类
安全科学 | 66篇 |
废物处理 | 196篇 |
环保管理 | 276篇 |
综合类 | 933篇 |
基础理论 | 76篇 |
污染及防治 | 148篇 |
评价与监测 | 127篇 |
社会与环境 | 22篇 |
灾害及防治 | 8篇 |
出版年
2024年 | 1篇 |
2023年 | 12篇 |
2022年 | 42篇 |
2021年 | 28篇 |
2020年 | 48篇 |
2019年 | 23篇 |
2018年 | 14篇 |
2017年 | 43篇 |
2016年 | 35篇 |
2015年 | 44篇 |
2014年 | 134篇 |
2013年 | 101篇 |
2012年 | 58篇 |
2011年 | 106篇 |
2010年 | 40篇 |
2009年 | 93篇 |
2008年 | 74篇 |
2007年 | 100篇 |
2006年 | 79篇 |
2005年 | 71篇 |
2004年 | 64篇 |
2003年 | 83篇 |
2002年 | 85篇 |
2001年 | 69篇 |
2000年 | 81篇 |
1999年 | 62篇 |
1998年 | 56篇 |
1997年 | 53篇 |
1996年 | 34篇 |
1995年 | 26篇 |
1994年 | 44篇 |
1993年 | 19篇 |
1992年 | 12篇 |
1991年 | 3篇 |
1990年 | 3篇 |
1989年 | 2篇 |
1987年 | 2篇 |
1986年 | 2篇 |
1984年 | 1篇 |
1982年 | 1篇 |
1979年 | 1篇 |
1977年 | 1篇 |
1975年 | 1篇 |
1973年 | 1篇 |
排序方式: 共有1852条查询结果,搜索用时 261 毫秒
561.
Ayomoh MK Oke SA Adedeji WO Charles-Owaba OE 《Journal of environmental management》2008,88(1):108-114
Indiscriminate disposal of municipal solid waste in developing countries poses severe environmental and health threats. The study proposes a new method for dealing with these problems. The hybrid structural interaction matrix (HSIM) was used to prioritise major identifiable environmental health factors arising from improper solid waste disposal. The simplistic resource allocation model was adopted to ensure optimality in the allocation of resources to prioritised factors. The study indicates that tackling environmental health impacts from the most prioritised negative disposal factors through optimal allocation of resources, will either reduce or eliminate the impacts associated with subsequent less prioritised factors that are direct consequences of the highly prioritised negative factors. The method proposed will aid decision makers in knowing which set of systemic factors are to be given preference and to what extent at given periods in time. 相似文献
562.
The application of microwave heating technology to conventional gas stripping processes has been investigated in the remediation of contaminated drill cuttings. The technical feasibility and limitations of nitrogen and steam stripping processes are demonstrated, and it is shown that the combination of microwave heating with the stripping process offers a step change in performance. Order of magnitude improvements in processing time are shown for the microwave-assisted processes, as well as greatly improved levels of remediation. The mechanisms of contaminant removal are discussed, along with the phenomena which occur with microwave heating processes. The energy requirements of each of pure gas and microwave-assisted processes are also discussed, and the potential applications of each technology are highlighted relative to the overall remediation requirements. 相似文献
563.
Waste paper samples made from newsprint, copier paper, and magazine paper, as well as samples of kraft pulp and thermomechanical
pulp, were pretreated with ozone to improve enzymatic hydrolysis. The ozone treatment of pulps of newsprint and of magazine
paper increased the specific surface areas and total pore volumes while decreasing the lignin content so that these values
became similar to those of thermomechanical pulps. These morphological and chemical changes in the pulps resulted in the increased
access of cellulase to the pulp fiber surface and increased enzymatic hydrolysis. For copier paper, in which the lignin content
was very low, additives on the pulp fiber surface were oxidized and removed by ozone treatment and extraction, and this allowed
improved enzymatic hydrolysis. In contrast, surface areas and total pore volumes of kraft pulp and bleached kraft pulp were
decreased by the ozone treatment, resulting in morphological changes in the pulps that decreased enzymatic hydrolysis. 相似文献
564.
Haruhiro Ino Yoshihisa Matsumoto Ryo Takahashi Kazukiyo Takami Junya Nishino Masaaki Itoh 《Journal of Material Cycles and Waste Management》2008,10(2):129-133
H-ZSM-5 zeolite-supported gallium oxides were studied as aromatization catalysts for polyolefin pyrolysate. The catalysts
were prepared by a conventional physical mixing method with a gallium content of 1.0 and 4.5 wt% and were reduced in flowing
hydrogen at 585°C. To test their activity, a polyolefin sample was pyrolyzed and passed over a heated catalyst layer; the
product was analyzed by gas chromatography/mass spectrometry. A continuous-flow fixed-bed reactor was used for aromatization
of a model gas of polyolefin pyrolysate. For chlorine-free sources at 450°C, the catalyst with only 1.0 wt% gallium exhibited
activity comparable to a gallium silicate catalyst. For chlorine-contaminated sources, the catalyst with 4.5 wt% gallium sustained
catalytic activity for long periods. From the activity test results, it was found that zeolite-supported gallium catalysts
prepared by the physical mixing method are suitable for converting polyolefin into aromatic hydrocarbons. 相似文献
565.
Heavy metal removal and cyanide destruction in the metal plating industry: an integrated approach from egypt 总被引:1,自引:0,他引:1
Wastewater produced from a metal plating is a major environmental problem. Industrial auditing revealed that the main source
of pollution mainly originated from rinsing water. The characterization of final effluent showed that it is highly contaminated
with hazardous heavy metals and cyanide. The concentration of copper, hexavalent chromium, nickel, and cyanide in the rinsing
water of metal plating department was 14.8, 40.9, 13.3, and 19 mg/l, respectively. The concentration of cyanide and zinc from
the galvanizing department reached 60 and 80 mg/l. The remediation scheme included the application of in-plant control measures
via changing the rinsing process followed by the destruction of cyanide and reduction of hexavalent chromium bearing wastes.
The pretreated wastes were then mixed with other industrial wastes prior to a combined chemical coagulation-sedimentation
using lime and/or lime in combination with ferric chloride. The results indicated that, after applying the waste minimization
measures alone at the source, prior to final treatment of industrial waste, removal rates of cyanide, copper, nickel, and
chromium concentrations were 23.2%, 14.9%, 32.3%, and 55.3%, respectively in the rinse water from metal plating department.
Furthermore, the removal rates of cyanide and zinc in the galvanizing department reached 59.7% and 24.3. The integrated control
measures and treatment scheme led to more than 99% removal of copper, nickel, chromium, and zinc, while the complete removal
of cyanide was achieved in the final effluent. 相似文献
566.
Investigating household preferences for kerbside recycling services in London: a choice experiment approach 总被引:2,自引:1,他引:1
Recent developments in national and European Union waste management policy have prompted considerable interest in alternative waste management programs, such as recycling, which could divert a portion of the municipal solid waste stream from landfills. This paper examines household preferences for kerbside recycling services and uses a stated preference choice experiment method to estimate households' valuation of such services. Using a sample of 188 households in the London area, the empirical analysis yields estimates of the willingness to pay for the number of 'dry' materials collected, the collection of compost, textile collection and the frequency of collection. 相似文献
567.
Fernandes HM Gomiero LA Peres V Franklin MR Simões Filho FF 《Journal of environmental management》2008,88(4):914-925
This paper discusses the environmental waste management of the Heap-Leach Uranium Production Facility of Caetité located in a semi-arid region in Brazil. A comparison is made with the first uranium production site of the country located in Poços de Caldas. It is demonstrated that differences in the operational process along with different environmental conditions can lead to different impacts. In the present case groundwater is the potential most sensitive environmental medium despite the well-established consensus in the literature that radon and aerosol emissions may turn-out to be the most relevant environmental aspects of an installation located at this type of region. Most of the 226Ra content in the ore remains in the leached ore that is deposited with the waste rock. A lack in appropriate prediction of the hydrological balance has been causing unanticipated emissions of liquid effluents into the environment. Chemical treatment of this effluent may be needed. Contamination of groundwater in the short term by the waste ponds is not to be expected but it can be a relevant issue in the long term. As a consequence, careful closure schemes will need to be put in place. Finally, the overall costs with remediation in the Caetité production center are lower than those observed at the Poços de Caldas mining site. 相似文献
568.
Sewage sludge (SS) can be applied to cropland to supply and recycle nutrients and organic carbon. Potentially toxic elements in the sludge, however, are of environmental concern. This study evaluates the changes in chemical speciation of Zn in three representative pristine soils of the Pampas Region, Argentina, measured with sequential extraction over a one-year period. Pure SS or SS containing 30% (DM) of its own incineration ash (AS) was applied to the soils at an application rate of 150Mgha(-1). Zn was sequentially fractionated into exchangeable, organically bound, inorganic and residual fractions. The application of the SS and AS amendments significantly increased Zn concentration in all soil fractions at each sampling date. At day 1, Zn was mainly found in the residual fraction. A year after the application of the amendments, redistribution towards the inorganic fraction was observed (41-76% of total Zn content). Zn found in exchangeable and inorganic fractions depended on soil pH rather than on the type of soil used. A negative and significant correlation was found between exchangeable Zn concentrations and soil pH (r=0.94), and a positive and significant correlation between inorganic Zn concentrations and soil pH (r=0.92). For each amended soil and sampling date, no significant differences were observed between SS or AS treatments for the exchangeable fraction. Moreover, the use of AS did not cause significant differences in Zn concentration in the other soil fractions compared to SS. Based on these results, land spreading of AS may be similar to SS diaposal in terms of Zn mobility. 相似文献
569.
Little is known about how the growth of trihalomethanes (THMs) in drinking water is affected in copper pipe. The formation of THMs and chlorine consumption in copper pipe under stagnant flow conditions were investigated. Experiments for the same water held in glass bottles were performed for comparison. Results showed that although THMs levels firstly increased in the presence of chlorine in copper pipe, faster decay of chlorine as compared to the glass bottle affected the rate of THMs formation. The analysis of water phase was supplemented by surface analysis of corrosion scales using X-ray photoelectron spectroscopy (XPS), scanning electron microscope (SEM) and energy dispersive spectroscopy (EDX). The results showed the scales on the pipe surface mainly consisted of Cu2O, CuO and Cu(OH)2 or CuCO3. Designed experiments confirmed that the fast depletion of chlorine in copper pipe was mainly due to effect of Cu2O, CuO in corrosion scales on copper pipe. Although copper(II) and copper oxides showed effect on THMs formation, the rapid consumption of chlorine due to copper oxide made THM levels lower than that in glass bottles after 4 h. The transformations of CF, DCBM and CDBM to BF were accelerated in the presence of copper(II), cupric oxide and cuprous oxide. The effect of pH on THMs formation was influenced by effect of pH on corrosion of copper pipe. When pH was below 7, THMs levels in copper pipe was higher as compared to glass bottle, but lower when pH was above 7. 相似文献
570.
The presence of disinfection byproducts (DBPs) such as trihalomethanes (THMs) and haloacetic acids (HAAs) in drinking water is of great concern due to their adverse effects on human health. Emerging regulation limiting the concentration of DBPs in drinking water has increased demands for technologies and processes which reduce the formation of DBPs in drinking water. In this study, UV-H2O2 based advance oxidation process (AOP) was used to treat raw surface water. Experiments were conducted using low pressure mercury vapor UV lamps in collimated beam and flow-through annular photoreactors. The effect of UV fluence (0–3500 mJ cm−2) and hydrogen peroxide concentration (0–23 mg l−1) in reducing the concentration of THMs and HAAs was examined. The UV-H2O2 AOP was then coupled with a downstream biological activated carbon (BAC) treatment to assess the synergetic benefits of combining the two treatments. It was observed that UV-H2O2 AOP was only effective at reducing DBPs at UV fluences of more than 1000 mJ cm−2and initial H2O2 concentrations of about or greater than 23 mg l−1. However, the combined AOP–BAC treatment showed significant reductions of 43%, 52%, and 59% relative to untreated raw water for DBPs, TOC, and UV254, respectively. 相似文献