全文获取类型
收费全文 | 266篇 |
免费 | 22篇 |
国内免费 | 83篇 |
专业分类
安全科学 | 18篇 |
废物处理 | 42篇 |
环保管理 | 16篇 |
综合类 | 207篇 |
基础理论 | 24篇 |
污染及防治 | 48篇 |
评价与监测 | 13篇 |
社会与环境 | 3篇 |
出版年
2022年 | 2篇 |
2021年 | 1篇 |
2020年 | 8篇 |
2018年 | 5篇 |
2017年 | 8篇 |
2016年 | 5篇 |
2015年 | 6篇 |
2014年 | 18篇 |
2013年 | 21篇 |
2012年 | 8篇 |
2011年 | 15篇 |
2010年 | 8篇 |
2009年 | 16篇 |
2008年 | 14篇 |
2007年 | 29篇 |
2006年 | 27篇 |
2005年 | 15篇 |
2004年 | 16篇 |
2003年 | 18篇 |
2002年 | 14篇 |
2001年 | 19篇 |
2000年 | 15篇 |
1999年 | 13篇 |
1998年 | 11篇 |
1997年 | 20篇 |
1996年 | 11篇 |
1995年 | 13篇 |
1994年 | 3篇 |
1993年 | 4篇 |
1992年 | 2篇 |
1991年 | 4篇 |
1990年 | 1篇 |
1989年 | 1篇 |
排序方式: 共有371条查询结果,搜索用时 15 毫秒
111.
112.
浅谈制浆造纸工业水污染处理技术 总被引:2,自引:0,他引:2
造纸行业是我国水污染的主要行业。本文分析了我国造纸工业水污染及其治理现状,论述了造纸工业水污染控制对策,提出了造纸工业中中段水采用物化十生化处理、废纸脱墨废水处理采用PE膜处理或气浮+好氧处理等工艺方法。 相似文献
113.
114.
115.
116.
117.
污泥厌氧消化液中碳酸盐对回收磷的影响 总被引:7,自引:4,他引:3
为探讨污泥厌氧消化液中碳酸盐对以磷酸钙盐形式回收磷的影响,以粉煤灰浸出液为钙源,考察了消化液中的碳酸盐对磷回收过程和磷回收产物性质的影响。实验结果表明,在反应pH为10、反应钙磷摩尔比为1.67、反应时间为10 m in的条件下,消化液碳酸盐浓度为2 400 mg/L(以CaCO3计)时,磷的回收率为78.53%,回收产物中磷含量(以P2O5计)为28.93%;对消化液进行盐酸预酸化使pH达到4及以下时,磷回收率接近100%,回收产物中磷含量(以P2O5计)达到43.08%。消化液中碳酸盐的存在易形成碳酸钙沉淀,从而降低了磷回收率、回收产物中磷含量以及回收产品的纯度;预酸化能够有效地去除消化液中的碳酸盐并降低了其对磷回收的不利影响。 相似文献
118.
Lu LT Chang IC Hsiao TY Yu YH Ma HW 《Environmental science and pollution research international》2007,14(1):49-59
Background Since the 1970s, at least 200 hectares (ha) of farmland has been polluted by the heavy metal cadmium (Cd).Consequently, the
Cd pollution has led to contaminate the rice production and caused acute social panic. According to the recent investigation
results performed by the Taiwan Environmental Protection Administration (TEPA), it is indicated that most of the Cd pollution
incidents in Taiwan resulted from the wastewater discharge of stearate Cd factories. To prevent the Cd pollution incidents
from spreading, the TEPA has either forced these factories to close down or assisted them in improving their production processes
since the 1980s. Unfortunately, accidental incidents of Cd pollution still emerge in an endless stream, despite the strict
governmental controls placed on these questionable factories. Whether this pollution has resulted from undetected or hidden
pollution sources stemming from two decades ago or comes from some new source, will be an outstanding issue. Therefore, this
study attempts to identify the pollution sources of Cd in soil in Taiwan as well as to find the solution to the above-mentioned,
outstanding issue by way of a methodology termed Material Flow Analysis (MFA).
Method logy. The MFA has proved to be a useful tool on providing quantitative information of the flow of substances through an economic
to an environmental system. Based upon the supply-and-demand theory of MFA, researchers have successfully conducted an overview
of the use of materials in many industries, the construction industry being one of these. Therefore, this study tries to establish
a set of analytical processes by way of MFA for identifying the pollution source of Cd in soil in Taiwan. In addition, the
spirit of Life Cycle Analysis (LCA) technique was also employed to identify the materials, and products should be ignored
as a crucial pollution source in this study.
Results and Discussion According to the MFA methodology applied in this study and on the basis of related studies performed by Taiwanese governmental
authorities, we arrive at the following analysis results: (1) the total amount of Cd from the economic perspective of material
and product flow was approximately 441.2 tons; (2) the wastewater directly discharged into irrigation water can be concluded
to be the major pollution route of Cd in farmland soil in Taiwan; (3) material plastic stabilizer (cadmium oxide, CdO), Zn-Pd
compounds and Cu compounds should be the crucial pollution sources to contaminate environment through the route of wastewater
in Cd flow analysis; (4) the crucial pollution sources to contaminate environment through the route of wastewater in Cd flow
analysis were five factories, Coin, Jili, Taiwan Dye, Guangzheng and Mingguan, and they were all categorized as stearate Cd
industries; (5) the typical source of the Cd pollution in soil in Changhua County through the pollution route of wastewater
should be the metal surfacing process industries.
Conclusions This study proved that MFA can be a good tool for identifying Cd flow as well as for recognizing the crux of the problem
concerning incidents of Cd pollution. This study led to the conclusion that the causal relationship between farmland pollution
caused by Cd and stearate Cd factories in Taiwan seemed quite close by way of MFA methodology. In addition, this study also
found that the wastewater discharged from a single metal surfacing process factory will not cause remarkable farmland pollution.
However, the wastewater simultaneously discharged from a group of pollution factories can result in a significant pollution
incident.
Recommendations and Outlook This case study is only a small contribution to the understanding of the toxic material flow related to Cd in the environment.
This study recommends that Taiwanese governmental authorities should not deal with problems on an ad hoc basis, but should
instead deal with Cd pollution problems overall employing control measures. Finally, the more accurate information or data
we can collect, the more reliable results we can identify. Therefore, the quality and quantity of related data used in this
MFA model should be closely scrutinized in order to ensure the most correct and comprehensive investigation on the toxic material
flow. 相似文献
119.
Leather industry is an important light industry in China.Leather making requires a series of chemical treatment.Degreasing,unhairing and chrome tanning wastewaters are the main portions of tannery wastewater.Reclaiming and reusing these wastewaters can eliminate 80% of COD,75% of BOD,95% of chromium and 93% of sulfuret,furthermore reduce environment impact,decrease treatment costs,save chemicals and water.Some application methods of wastewater reclamation and reuse for different operations were reported.The suitable reclamation and reuse technologies can enable leather making processes more rational,and realize the recovery and recycle of several chemicals in the tannery.Resourceful utilization of tannery wastewater should mate with renovating production technology,updating equipment,and must be guaranteed sufficiently by environmental protection measures. 相似文献
120.
以乙醇为溶析剂,通过过滤—中和—蒸馏浓缩—溶析结晶等工序,从白炭黑废母液中回收硫酸钠。考察了硫酸钠回收效果的影响因素,并进行了热能消耗和处理成本的分析。实验结果表明:乙醇的加入量对硫酸钠溶解度和蒸馏浓缩过程有着显著影响;在蒸馏醇水比(乙醇与中性废母液的体积比)为0.27,浓缩废母液中硫酸钠质量浓度为69.27 g/L,溶析醇水比(乙醇与浓缩废母液的体积比)为1的最佳工艺条件下,白炭黑废母液中硫酸钠的一次回收率可达69.94%,硫酸钠产品的纯度达到97.3%。 相似文献