超声萃取-高效液相色谱法测定土壤中苯并[a]芘研究

采用超声萃取-高效液相色谱荧光检测法对土壤中苯并[a]芘含量进行定性、定量分析.土壤样品用正己烷/二氯甲烷(1+1)超声萃取,萃取液经硅胶柱或佛罗里硅土柱净化浓缩定容,乙腈-水为流动相,线性梯度洗脱,流速为1.0 mL/min,荧光检测器激发波长为280 nm,发射波长为420 nm,外标法峰面积定量.结果显示:该方法检出限低,苯并[a]芘的检出限为0.15μg/kg.这种方法具有很好的精密度,相对标准偏差为3.9%~8.4%.实际水样加标回收率范围在72.5%~85.8%.能够满足土壤的监测要求.     

反渗透工艺在冷轧废水脱盐处理的应用

利用反渗透工艺对冷轧废水生化处理废水进行处理,获得了较好的脱盐效果。选取进水含盐量、回收率、pH值对系统脱盐率的影响。结果表明:当进水电导率为1 360μs/cm时,系统脱盐率可达94.7%;进水电导率为3 353μs/cm时,系统脱盐率为85.9%。当系统回收率低于77%时,除盐率受其影响较小在90%左右,但是若进一步增加系统回收率,则脱盐效果显著下降。当进水pH值越高脱盐效果越高,但为降低结垢风险,本系统进水pH值控制在7.1左右。     

废水中氨氮湿式空气氧化和超临界水氧化研究进展

湿式空气氧化法(WAO)和超临界水氧化法（SCWO)废水处理技术近年已有广泛研究。当催化剂存在于氧化体系时,不仅能降低反应温度、压力,而且可提高废水中有害物质的降解效率。介绍了氨的湿式空气氧化和超临界水氧化催化剂应用的研究进展、各种催化剂在超临界水中的稳定性能及氨的催化超临界水氧化情况。     

Estimation of Normal Variance Based on Balanced and Unbalanced Ranked Set Samples

In this paper we address the problem of estimation of the variance of a normal population based on a balanced as well as an unbalanced ranked set sample (RSS), which is a modification of the original RSS of McIntyre (1952).We have proposed several methods of estimation of variance by combining different unbiased between and within estimators, and compared their performances     

从委托代理理论谈中国的环境影响评价制度

根据委托代理理论,分析了中国环境影响评价制度中存在的问题,立足于绿色招商的理念,理顺建设项目环评委托代理关系,明确了建设单位、环评单位、招商部门、环保部门等相互之间的关系和职责,以使中国的环境影响评价制度更适应新型工业化道路发展的要求。     

城市规划的环境影响评价研究初探

环境影响评价法的颁布是中国环境影响评价的一个新阶段。中国至今尚无明确的、系统的规划环境影响评价的技术导则和规范,其评价理论仍在探索之中。分析了国内外规划环境影响评价的历史和现状。从区域环境影响评价的实践经验总结出了城市规划环境影响评价应强调城市发展的可持续性。探讨了该层次评价的介入时间、评价原则、环境影响因素识别及评价内容,提出从生态合理性、绿色化程度等方面考虑城市规划的生态环境影响。     

管式膜连续微滤装置处理回用城市污水的中试研究

就管式膜连续微滤装置对城市污水处理厂二沉池出水处理回用的可行性进行了中试研究 ,结果表明 ,该装置在运行压力为 0 .1 2～ 0 .1 5MPa ,反冲洗间隔为 1 8min时 ,吨水能耗仅为 0 .4 5kWh。此时对COD、浊度有较高的去除率 ,分别为 75 .71 %和 94 .4 9% ,对氨氮也有一定的去除效果 ,去除率为 4 0 .2 6 % ;处理后出水COD、氨氮、浊度均明显优于《生活杂用水水质标准》(CJ2 5 .1 89)中的相关规定。该装置成本低、操作简单 ,用于污水回用具有较高技术经济可行性     

The measurement of green finance index and the development forecast of green finance in China

This paper proposes a green finance index that may help policymakers and investors take more favorable actions based on the development of green finance. After analysis and organization of the development process of green finance and related green finance and index concepts, this paper uses the improved fuzzy comprehensive evaluation method to construct a measurement model suitable for measuring the development level of green finance based on the principle of fuzzy mathematics. The index weight adopts the entropy method and improved Analytic Hierarchy Process (AHP) joint determination. At the same time, using the relevant statistical indicators of China's green credit from 2011 to 2019, and using the constructed model, the level of China's green finance development during this period was evaluated. Finally, the obtained data and classical gray model methods were used to predict China's green development level from 2020 to 2024. The research results show that: This model is a good measure of the level of development of green finance, and China's green finance index has generally shown a rapid growth trend over the past nine years, with the fastest growth rate between 2013 and 2014. From the perspective of the weight of each index affecting the green financial index, the weight of new energy, green transportation projects and new energy vehicles ranked in the top three, and the impact of these three indexes on China's green financial index is significant. In the future, China's green financial development level will continue to improve.

     

Novel perspective for urban water resource management: 5R generation

• 5R (Recover, Reduce, Recycle, Resource and Reuse) approaches to manage urban water. • 5R harvests storm water, gray water and black water in several forms. • 5R offers promise for moving solutions for urban water scarcity in practice. Demand for water is expanding with increases in population, particularly in urban areas in developing countries. Additionally, urban water system needs a novel perspective for upgradation with urbanization. This perspective presents a novel 5R approach for managing urban water resources: Recover (storm water), Reduce (toilet flushing water), Recycle (gray water), Resource (black water), and Reuse (advanced-treated wastewater). The 5R generation incorporates the latest ideas for harvesting storm water, gray water, and black water in its several forms. This paper has briefly demonstrated each R of 5R generation for water treatment and reuse. China has the chance to upgrade its urban water systems according to 5R principles. Already, a demonstration project of 5R generation has been installed in Qingdao International Horticultural Exposition, and Dalian International Convention Center (China) has applied 5R, achieving over 70% water saving. The 5R offers promise for moving solutions for urban water scarcity from “hoped for in the future” to “realistic today”.     

基于希瓦氏菌合成的荧光碳点及其用于Fe3+和对硝基苯酚(p-NP)的检测

本文以Shewanella oneidensis MR-1为原料,通过一步水热法合成了荧光碳点(CDs@MR-1).采用透射电子显微镜(TEM)、X射线光电子能谱(XPS)、傅里叶红外光谱(FT-IR)、X射线衍射(XRD)和荧光光谱(PL)等手段对CDs@MR-1的形貌、结构和组成、表面基团以及光学性能进行了表征.研...