高含氯采油废水CODcr测定质量控制方法研究

通过对高含氯采油废水CODcr测定过程中因稀释产生的滴定误差和高含氯采油废水现场加标回收率测定结果的分析,提出了适宜高含氯采油废水的质量控制方法,既空白试验值判断法、平行双样法和密码样控制法。     

引导儿童用植物净化家居空气

家居内的空气污染,是现代生活方式的一种产物,而且,这种污染的程度,会随着人们对新潮物质享受的追求而不断增加。因此,应该及早引导儿童关注身边的污染,并设法减轻它的危害,笔者按照下面的思路引导儿童认识并采取行动：讲述居室空气被有毒气体污染的调查结果并说明污染的成因和危害性;介绍具有净化空气功能的植物;传授几种植物的培植方法,将改善居所空气污染状况的愿望,变成呵护花木的实际行动;以两种植物的长势为例,说明放在居所里的花木,如果生机勃勃,就是它们净化空气功能的体现。对居所存在空气污染的调查美国国家环保局…     

Investigation on solar photocatalytic degradation of various dyes in the presence of Er3+:YAlO3/ZnO–TiO2 composite

In this work, Er³⁺:YAlO₃/ZnO–TiO₂ and ZnO–TiO₂ composites were prepared by the ultrasonic dispersion and liquid boiling method. In succession, they were then characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). Acid red B as a model dye compound was degraded under solar light irradiation to evaluate the photocatalytic activities of the Er³⁺:YAlO₃/ZnO–TiO₂ and ZnO–TiO₂ composites. We found that the photocatalytic activity of ZnO–TiO₂ composite can be enhanced by adding an appropriate amount of Er³⁺:YAlO₃. We reviewed influencing factors, such as Er³⁺:YAlO₃ content, heat-treated temperature and heat-treated time on the photocatalytic activity of the Er³⁺:YAlO₃/ZnO–TiO₂ composites. In addition, the effects of solar light irradiation time, dye initial concentration, Er³⁺:YAlO₃/ZnO–TiO₂ amount and solution acidity on the photocatalytic degradation of acid red B dye in aqueous solution were investigated in detail. Simultaneously, the degradation and comparison of other dyes such as methyl orange (MO), rhodamine B (RM-B), azo fuchsine (AF), congo red (CG-R) and methyl blue (MB) were also reviewed. In addition, we attempted to explore both the principle of possible excitation of Er³⁺:YAlO₃/ZnO–TiO₂ under solar light irradiation and the mechanism of photocatalytic degradation.     

生活垃圾焚烧发电厂烟尘中重金属沉降对土壤环境影响分析

本文以一日处理生活垃圾2250t的生活垃圾焚烧发电厂为例,根据其重金属的排放量,预测重金属随大气扩散、迁移,最终通过自然降水和自然沉降进入土壤后,对土壤环境的影响。结果表明,项目建成后的20年内,大气评价范围内土壤中重金属的累计值满足《土壤环境质量建设用地土壤污染风险管控标准(试行)》 (GB36600-2018)表1中第二类用地筛选值要求。     

灾变危机管理的社会协同问题

灾变危机管理的社会协同是指在强调政府责任的同时，充分依靠多元社会力量的广泛参与和社会联动，既重视规范性行动也重视志愿性行动，以形成一种有秩序、有规则的自组织系统，从而增大灾变危机管理功效的灾变危机管理模式。本文对灾变危机管理为何需要社会协同，何以能够社会协同，如何实现社会协同进行了初步的探讨。     

论我国能源法律体系的低碳使命

能源法律体系不仅保障能源的有效供给，还承载着低碳和减排的使命，建构合理而可行的、具有低碳内涵的能源法律体系是低碳经济法律体系的重要组成部分，也是低碳法律体系的基础。在将要逐步完善的能源法体系中应基于我国能源结构及其现实禀赋认真全面落实低碳经济的主要制度，将低碳经济规律全面、具体地贯彻和体现在能源法体系中，采取可行的拳措和步骤逐步提升能源法律体系的低碳内涵。     

Cost-Effective Control of Ground-Level Ozone Pollution in and around Beijing

Abstract

Ground level ozone pollution has become a significant air pollution problem in Beijing. Because of the complex way in which ozone is formed, it is difficult for policy makers to identify optimal control options on a cost-effective basis. This paper identifies and assesses a range of options for addressing this problem. We apply the Ambient Least Cost Model and compare the economic costs of control options, then recommend the most effective sequence to realize pollution control at the lowest cost. The study finds that installing of Stage II gasoline vapor recovery system at Beijing’s 1446 gasoline stations would be the most cost-effective option. Overall, options to reduce ozone pollution by cutting vehicular emissions are much more cost-effective than options to “clean up” coal-fired power plants.     

Nature Reserve and Ecotourism Development in China's Wuzhishan Mountain Region

Abstract

As the protected areas of land and coastal environment, nature reserves are designed to address how to reconcile the conservation of biodiversity, the quest for economic and social development and the maintenance of cultural values. This paper establishes a framework for nature reserve development that seeks to incorporate ecotourism into its strategies. The overall purpose was to identify the information needs required for a comprehensive nature reserve that incorporates ecotourism related values. It also illustrates the utility of this framework in the context of the Wuzhishan Mountain Region of China. A literature review, the first phase of a visionary strategy and a subsequent gap analysis for available management information were undertaken in order to achieve this paper's purpose. Finally, recommendations are presented for integrating ecotourism into nature reserve development in the Wuzhishan Mountain Region.     

Biogeochemical properties and potential risk of shallow arsenic-rich sediment layers to groundwater quality in Western Bangladesh

Environmental Geochemistry and Health - The arsenic-contaminated groundwater has attracted attention in much south and southeast Asian deltas, however, mainly on the deep aquifers. Here, arsenic...     

Differences in the quality of steamed hull-less barley and wheat cakes北大核心CSCD

In this study, three different hull-less barley varieties were used to prepare steamed cakes, and their nutritional value, sensory qualities, textural properties, and in vitro starch hydrolysis were evaluated. The results showed that the contents of total dietary fiber (4.50%-5.12%), β-glucan (2.96%-3.96%), total flavonoids (12.56-38.73 mg/100 g), and γ-aminobutyric acid (5.08-9.53 mg/100 g) in the steamed hull-less barley cakes were significantly higher than that in the steamed wheat cake, which were 0.65%, 0.23%, 3.93 mg/(100 g), and 2.63 mg/(100 g), respectively. The sensory properties of steamed ordinary hull-less barley and wheat cakes were not significantly different, but the steamed 08-1127 (waxy hull-less barley) cake was softer and out of shape. The springiness, resilience, cohesiveness, gumminess, and adhesiveness of steamed ordinary hull-less barley cakes were similar to those of steamed wheat cake, while those of steamed 08-1127 cakes were significantly lower than those of steamed ordinary hull-less barley cakes. Steamed hull-less barley cake also showed a maximum starch hydrolysis rate (38.76%-42.74%) that was lower than that of steamed wheat cake (49.92%), and the contents of rapidly (11.58%-13.16%) and slowly digested starch (5.34%-7.56%) were lower than that of steamed wheat cake (17.21% and 15.97%, respectively). In addition, the glycemic (59.37-61.67) and hydrolysis indexes (35.82-40.00) were lower than those of steamed wheat cake (76.66 and 67.30, respectively), and the contents of resistant starch (2.74%-3.55%) were higher than those of wheat steamed cake (1.68%). Therefore, the steamed cakes of ordinary hull-less barley had a higher content of nutritional components than the steamed cake of wheat, and the in vitro starch hydrolysis parameters were better than those of steamed wheat cake. When it is necessary to consider both nutritional and sensory qualities, ordinary hull-less barley can be selected as the raw material for steamed cakes, but waxy hull-less barley is not suitable for making steamed cakes. © 2022 Science Press. All rights reserved.