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301.
采用改良型的A2/O工艺试验装置进行试验,在水力停留时间为12 h、溶解氧浓度为0.5~0.8 mg/L的条件下,考察了投加改性的磁性药剂前后进、出水各污染物的变化情况。结果表明,投加改性的磁性药剂前后, COD、NH 3-N、TN、TP的平均去除率分别为68%与81%、55%与80%、51%与69%、44%与70%,较投加改性的磁性药剂前,去除率分别提高了19%、45%、35%、59%。中试结果证明,该改性的磁性药剂可以提高反应池对上述污染物的去除效果,应用前景较好。 相似文献
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以沉淀法、离子交换法和原位法制备了Ag_3PO_4/海泡石复合光催化剂,采用XRD、FTIR、UV-Vis-DRS对其结构进行了表征,以可见光驱动催化降解日落黄染料为探针反应,考察了制备方法对催化剂光催化性能的影响。结果表明:Ag_3PO_4与海泡石成功复合并产生了协同作用,催化剂中Ag_3PO_4均为立方晶型,部分Ag_3PO_4进入了海泡石层间,改变了其晶面有序性并拓宽了层间距,海泡石对Ag_3PO_4的复合提高了Ag_3PO_4的稳定性和光催化活性;其中,离子交换法制备的光催化剂中Ag_3PO_4与海泡石的复合程度最高,Ag_3PO_4稳定性最强,光催化活性最好,在可见光驱动下,该催化剂对50 mg/L的日落黄降解率可达97.16%,并且对其他3种50 mg/L的染料废水的降解率也在86%以上,此外,该催化剂再生2次后仍保持良好的活性和稳定性。 相似文献
305.
在传统行政区行政理念的主导下,流域政府皆以追求本地利益最大化为基本目标,甚少关注甚至漠视流域公共利益,流域政府间利益冲突严重,因此,难以对跨省流域生态补偿达成一致意见.跨省流域生态补偿的实施有赖于政府行政管理理念向区域治理理念的转变和相应的机制创新,包括建立流域政府间的民主协商机制、多元主体联合供给机制和中央对流域政府的选择性激励机制. 相似文献
306.
Jinchuan Xie Jianfeng Lin Xiaohua Zhou Mei Li Guoqing Zhou 《Environmental science and pollution research international》2014,21(11):7219-7226
Low-solubility contaminants with high affinity for colloid surfaces may form colloid-associated species. The mobile characteristics of this species are, however, ignored by the traditional sorption/distribution experiments in which colloidal species contributed to the immobile fraction of the contaminants retained on the solids as a result of centrifugation or ultrafiltration procedures. The mobility of the contaminants in subsurface environments might be underestimated accordingly. Our results show that colloidal species of 239Pu in three-phase systems remained the highest percentages in comparison to both the dissolved species and the immobile species retained on the granite grains (solid phase), although the relative fraction of these three species depended on the colloid types. The real solid/liquid distribution coefficients (K s/d) experimentally determined were generally smaller than the traditional K s/d (i.e., the K s+c/d in this study) by ~1,000 mL/g for the three-phase systems with the mineral colloids (granite particle, soil colloid, or kaolinite colloid). For the humic acid system, the traditional K s/d was 140 mL/g, whereas the real K s/d was approximately zero. The deviations from the real solid/liquid K s/d were caused by the artificially increased immobile fraction of Pu. One has to be cautious in using K s/d-based transport models to predict the fate and transport of Pu in the environment. 相似文献
307.
监测机构垂直管理可以避免地方行政干扰,更好地发挥环境监测机构的应有作用,而成立区域性环境监测中心是监测机构垂直管理后的一种管理方式,也是一种创新模式。区域性环境监测中心必须满足一定的条件,通过区域性环境监测中心的设置条件,对设置区域性环境监测中心的必要性进行了分析。通过设置区域性监测中心,可以较好地提高监测机构的工作效能、提升仪器设备利用率和监测技术人员水平,及时掌握环境质量变化趋势、监管污染物排放、缩短应急反应时间,充分发挥监测机构垂直管理后的作用。 相似文献
308.
Irene Mei Leng Chew Raymond R. Tan Dominic Chwan Yee Foo Anthony Shun Fung Chiu 《Journal of Cleaner Production》2009,17(18):1611-1619
Industrial water conservation is an important adaptation to the effects of climate change. In addition to water conservation within individual plants, wastewater can be reused/recycled among different companies through inter-plant water integration (IPWI) schemes. Such schemes are based on the concept of industrial ecology and industrial symbiosis, and can be used to achieve greater water savings than when water conservation is implemented in individual companies separately. However, in IPWI, each participating company seeks to maximise its own benefits. In the absence of centralised authority dictating the terms of water integration schemes, conventional modelling techniques are not appropriate. This paper shows how a game theory-based approach can be used to analyse the interaction of participating companies in an eco-industrial park seeking to develop an IPWI scheme. 相似文献
309.
Pin-Chao Liao Xinlu Sun Mei Liu 《International journal of occupational safety and ergonomics》2019,25(4):495-509
Introduction. Navigated safety inspection based on task-specific checklists can increase the hazard detection rate, theoretically with interference from scene complexity. Visual clutter, a proxy of scene complexity, can theoretically impair visual search performance, but its impact on the effect of safety inspection performance remains to be explored for the optimization of navigated inspection. This research aims to explore whether the relationship between working memory and hazard detection rate is moderated by visual clutter. Methods. Based on a perceptive model of hazard detection, we: (a) developed a mathematical influence model for construction hazard detection; (b) designed an experiment to observe the performance of hazard detection rate with adjusted working memory under different levels of visual clutter, while using an eye-tracking device to observe participants’ visual search processes; (c) utilized logistic regression to analyze the developed model under various visual clutter. Conclusion. The effect of a strengthened working memory on the detection rate through increased search efficiency is more apparent in high visual clutter. This study confirms the role of visual clutter in construction-navigated inspections, thus serving as a foundation for the optimization of inspection planning. 相似文献
310.
Ye Siqi Zhang Dengpan Chen Bo Xu Jieping Jia Changkai Mei Deqing Yuan Yinnan 《Environmental science and pollution research international》2023,30(9):22458-22470
Environmental Science and Pollution Research - Biodiesel combustion particulate matter (PM) is different from diesel combustion PM in terms of microscopic morphology, which directly affects the... 相似文献