全文获取类型
收费全文 | 72篇 |
免费 | 13篇 |
国内免费 | 43篇 |
专业分类
安全科学 | 4篇 |
废物处理 | 16篇 |
环保管理 | 8篇 |
综合类 | 67篇 |
基础理论 | 13篇 |
污染及防治 | 18篇 |
评价与监测 | 1篇 |
社会与环境 | 1篇 |
出版年
2023年 | 2篇 |
2022年 | 4篇 |
2021年 | 7篇 |
2020年 | 6篇 |
2019年 | 2篇 |
2018年 | 1篇 |
2017年 | 5篇 |
2016年 | 2篇 |
2015年 | 7篇 |
2014年 | 8篇 |
2013年 | 7篇 |
2012年 | 9篇 |
2011年 | 8篇 |
2010年 | 4篇 |
2009年 | 5篇 |
2008年 | 4篇 |
2007年 | 3篇 |
2006年 | 8篇 |
2005年 | 6篇 |
2004年 | 6篇 |
2003年 | 7篇 |
2002年 | 1篇 |
2001年 | 2篇 |
2000年 | 4篇 |
1999年 | 1篇 |
1998年 | 3篇 |
1996年 | 2篇 |
1995年 | 2篇 |
1992年 | 1篇 |
1990年 | 1篇 |
排序方式: 共有128条查询结果,搜索用时 15 毫秒
31.
32.
铁盐作为自养反硝化电子供体时,被氧化产生的高价铁易于沉淀,使得反硝化微生物表面产生"铁壳",其抑制微生物的活性,甚至导致微生物死亡.为解决自养铁盐脱氮反应器因"铁壳"包被而导致的反应器效能下降问题,本文采用共基质模式培养铁盐脱氮反应器,即在反应器进水中适量添加少量乙酸钠,作为有机电子供体,以期实现铁盐脱氮反应器的高效、稳定运行.结果表明,添加适量有机物可使得铁盐脱氮反应器高效稳定运行,效能(以N计)达0. 51 kg·(m3·d)-1,稳定运行约30d.共基质模式下,反应器运行期间始终可以检测到异养菌.结合污泥的TEM检测结果,发现在铁盐脱氮反应器稳定运行期间,异养菌是铁盐脱氮主力军,其独特的铁盐代谢方式可有效避免铁壳形成.本项研究有效解决了铁盐脱氮过程中微生物"铁壳"包被难题,将助力于自养脱氮技术的研发及应用. 相似文献
33.
以喹啉为处理目标物,采用Fe2+活化K2S2O8(PS)的高级氧化体系在不同环境因素下降解喹啉.结果表明:与单一PS体系和Fe2+体系相比,Fe2+/PS体系可以有效降解喹啉.在初始喹啉浓度为250mg/L,喹啉/PS物质的量比为1:10,PS/Fe2+物质的量比为3,初始pH3,反应温度为45℃,反应时间为80min的条件下,喹啉降解率可达100%.提高PS和Fe2+浓度均能有效提高喹啉降解率,但超过一定限值后对喹啉去除效果不明显.Fe2+/PS去除喹啉的过程符合一级反应动力学.溶液初始pH值越高,喹啉去除率越低;反应温度越高,喹啉去除率越高.自由基淬灭实验证实,Fe2+活化PS体系中有SO4-·和OH·的存在,其中由SO4-·产生的OH·对喹啉的降解占主导地位.通过GC/MS检测到2种中间产物8-羟基喹啉和2(1H)-喹啉酮,据此推测基于硫酸根自由基强化喹啉降解的可能路径.大肠杆菌急性毒性实验结果证实,虽然Fe2+/PS体系去除喹啉过程中产生了毒性更强的中间产物,但酸性条件和较高的反应温度有利于体系脱毒. 相似文献
34.
以广东省潮州市彩塘不锈钢电镀区的水体为例,研究了电镀废水、底泥的Cr分布特征和基本特性,并针对废水基本特性,采用FeSO4进行调控,探讨如何将Cr6+转化Cr3+以及除去废水中Cr的途径。电镀废水中的总Cr和Cr6+分别为57.3mg/L、42.4mg/L,远远超过了电镀废水排放标准37、83倍,导致河流水体Cr6+超过环境质量标准。电镀废水具有低pH值和高电导率。电镀区底泥Cr大大超过背景值,底泥中的Cr残渣态含量最高,其次是氧化态、还原态,可溶态和碳酸盐态含量低,说明了底泥存在潜在危害性。FeSO4能有效地将Cr6+还原为Cr3+,Fe2+/Cr6+摩尔比为4具有很好转化效率,还原充分后将pH值调至9,对Cr3+具有最好的沉淀效果,通过该途径有效除去废水的Cr。 相似文献
35.
Impact of different benthic animals on phosphorus dynamics
across the sediment-water interface 总被引:9,自引:2,他引:7
Lei Zhang Xiaozhi Gu Chengxin Fan Jingge Shang Qiushi Shen Zhaode Wang Ji Shen 《环境科学学报(英文版)》2010,22(11):1674-1682
As a diagenetic progress, bioturbation influences solute exchange across the sediment-water interface (SWI). Different benthic
animals have various mechanical activities in sediment, thereby they may have different effects on solute exchange across the SWI.
This laboratory study examined the impacts of different benthic animals on phosphorus dynamics across the SWI. Tubificid worms and
Chironomidae larvae were introduced as model organisms which, based on their mechanical activities, belong to upward-conveyors
and gallery-diffusers, respectively. The microcosm simulation study was carried out with a continuous flow culture system, and all
sediment, water, and worms and larvae specimens were sampled from Taihu Lake, China. To compare their bioturbation effects, the
same biomass (17.1 g wet weight (ww)/m2) was adopted for worms and larvae.Worms altered no oxygen penetration depth in sediment,
while larvae increased the O2 penetration depth, compared to the control treatment. Their emergence also enhanced sediment O2 uptake.
The oxidation of ferrous iron in pore water produced ferric iron oxyhydroxides that adsorbed soluble reactive phosphorus (SRP) from
the overlying water and pore water. Larvae built obviously oxidized tubes with about 2 mm diameter and the maximum length of 6 cm
in sediment, and significantly decreased ferrous iron and SRP in the pore water compared to the control and worms treatments. Worms
constructed no visually-oxidized galleries in the sediment in contrast to larvae, and they did not significantly alter SRP in the pore
water relative to the control treatment. The adsorption of ferric iron oxyhydroxides to SRP caused by worms and larvae inhibited SRP
release from sediment. Comparatively, worms inhibited more SRP release than larvae based on the same biomass, as they successively
renewed the ferric iron oxyhydroxides rich oxidation layer through their deposition. 相似文献
36.
37.
Simultaneous removal of chromium and arsenate from contaminated
groundwater by ferrous sulfate: Batch uptake behavior 总被引:1,自引:0,他引:1
Chromium and/or arsenate removal by Fe(II) as a function of pH, Fe(II) dosage and initial Cr(VI)/As(V) ratio were examined in
batch tests. The presence of arsenate reduced the removal e ciency of chromium by Fe(II), while the presence of chromate significantly
increased the removal e ciency of arsenate by Fe(II) at pH 6–8. In the absence of arsenate, chromium removal by Fe(II) increased to
a maximum with increasing pH from 4 to 7 and then decreased with a further increase in pH. The increment in Fe(II) dosage resulted
in an improvement in chromium removal and the improvement was more remarkable under alkaline conditions than that under acidic
conditions. Chromium removal by Fe(II) was reduced to a larger extent under neutral and alkaline conditions than that under acidic
conditions due to the presence of 10 mol/L arsenate. The presence of 20 mol/L arsenate slightly improved chromium removal by
Fe(II) at pH 3.9–5.8, but had detrimental e ects at pH 6.7–9.8. Arsenate removal was improved significantly at pH 4–9 due to the
presence of 10 mol/L chromate at Fe(II) dosages of 20–60 mol/L. Elevating the chromate concentration from 10 to 20 mol/L
resulted in a further improvement in arsenate removal at pH 4.0–4.6 when Fe(II) was dosed at 30–60 mol/L. 相似文献
38.
脱硫废液因含有高浓度氰化物、硫氰化物、硫化物等有毒组分而影响焦化废水处理的生物工艺.以焦化企业产生的实际脱硫废液为研究对象,选用化学沉淀-Fenton氧化的串联方法尝试预处理及分析方法的可行性,通过单因素实验,考察了硫酸亚铁投加剂量、反应前后溶液pH值、反应时间3种条件对脱硫废液中总氰及易释放氰去除效果的影响,在优化条件下对经硫酸亚铁沉淀后的脱硫废液残液进行Fenton氧化实验.结果表明,当硫酸亚铁投加量为理论值的1.2倍,H2O2投加量为COD当量的0.3倍时,可使脱硫废液的COD去除率达到76.65%,使初始浓度分别为327.7、704.6和2087.3 mg.L-1的氰化物、硫氰化物及硫化物基本得到去除,为后续生物处理创造了有利条件.化学沉淀结合Fenton法是脱硫废液预处理效率高且实用的方法. 相似文献
39.
40.