Temporal variations and source apportionment of volatile organic compounds at an urban site in Shijiazhuang, China

Shijiazhuang, the city with the worst air quality in China, is suffering from severe ozone pollution in summer. As the key precursors of ozone generation, it is necessary to control the Volatile Organic Compounds (VOCs) pollution. To have a better understanding of the pollution status and source contribution, the concentrations of 117 ambient VOCs were analyzed from April to August 2018 in an urban site in Shijiazhuang. Results showed that the monthly average concentration of total VOCs was 66.27 ppbv, in which, the oxygenated VOCs (37.89%), alkanes (33.89%), and halogenated hydrocarbons (13.31%) were the main composite on. Eight major sources were identified using Positive Matrix Factorization modeling with an accurate VOCs emission inventory as inter-complementary methods revealed that the petrochemical industry (26.24%), other industrial sources (15.19%), and traffic source (12.24%) were the major sources for ambient VOCs in Shijiazhuang. The spatial distributions of major industrial activities emissions were identified by using geographic information statistics system, which illustrated the VOCs was mainly from the north and southeast of Shijiazhuang. The inverse trajectory analysis using Hybrid Single-Particle Lagrangian Integrated Trajectory (HYSPLIT) and Potential Source Contribution Function (PSCF) clearly demonstrated the features of pollutant transport to Shijiazhuang. These findings can provide references for local governments regarding control strategies to reduce VOCs emissions.     

浙江省污水处理厂现状、存在问题及对策建议

根据对浙江省37家城市污水处理厂和大型工业污水集中处理厂20个月的监督监测结果，评述了该省城市污水处理厂和大型工业污水集中处理厂的现状，分析了经处理后排放的尾水超标原因和存在问题，并提出对策和建议。     

关于宁夏环境监测工作存在问题及其对策的研究

通过认真、细致的分析环境监测工作存在的主要问题，提出了宁夏监测工作创新发展的思想与建议。     

危险化学品环境风险评估报告编制中若干问题的研究

为加强重点危险化学品环境管理工作,国家要求实行重点危险化学品环境风险评估制度。在风评制度尚未全面开展的情况下,通过先行对一家重点环境管理危险化学品使用企业开展风险评估,从而对风评报告编制过程中存在的问题与困难进行总结,并提出建议与对策,可为其他编制机构开展环境风险评估工作提供指导作用。     

民爆企业安全教育培训存在的问题及建议

本文深入分析了民爆企业当前安全教育培训存在的主要问题,通过分析问题产生的原因,并结合实际情况,提出了提高民爆企业安全教育培训实效性的对策和建议.     

浅谈锅炉烟气测试中应注意的问题

以各监测站普便使用的青岛崂应用3012自动烟尘/气测试仪为例，针对锅炉烟气测试过程中遇到的问题，提出相应的解决方法及建议。     

柴达木盆地环境问题及对策建议

柴达木盆地连接西藏、新疆南疆、河西走廊,在西部大开发中处于重要的战略地位。本文对盆地的地貌,森林、草地、水矿藏等环境的现状,存在的主要环境问题进行了详细论述,提出了防治对策建议。     

生态文明建设的基本关系:环境社会系统中的四种关系论

文章主要以中国古代文明为例,指出人与自然的关系在文明演化中存在分裂的现象,并初步论证了人与自然的关系可以被分解成两种关系,即人与夭的关系和人与物的关系.在人与自然关系中,从系统的整体角度考虑,将涉及到的人与自然的关系称为人与天的关系;从自然中一个个独立存在的个体角度考虑,人与自然的关系主要体现为人与物的关系.此种分解亦可以作为理解"李约瑟问题"的一种视角.本文将这两种关系以及人与人的关系、人与自身的关系,共四种关系,统一在三种生产理论的框架内.这样的划分对落实科学发展观,建设生态文明,发展环境管理学都有重要的理论指导意义.     

Issues in reverse supply chains,part II: reverse distribution issues – an overview

In recent years, due to growing environmental concern, there has been an increasing attention to product take‐back, product recovery and the re‐distribution of end‐of‐life products. Reverse logistics (RL), which refers to the distribution activities involved in product returns, has recently received much attention because many companies are using it as a strategic tool to serve their customers; and can generate good revenue. The management of return flow usually requires a specialised infrastructure with special information systems for tracking and dedicated equipment for the processing of returns. An efficient reverse distribution structure may lead to a significant return on investment as well as a significantly increased competitiveness in the market. Therefore, the time seems to be right for a systematic overview of various issues that are arising in the context of reverse distribution. The main purpose of this paper is to review the literature on RL and suggest a classification based on reverse distribution issues. The result of this research provides a better understanding of the RL concept and outlines some future directions of research on modelling and analysis.     

我国《土壤环境质量标准》中重金属污染相关问题探讨

我国《土壤环境质量标准》（GB 15168—1995）的颁布促进了土壤资源的保护、管理与监督,但由于时间跨度过长社会发展较快,已经不能满足目前实际应用的需要。本文概述了发达国家关于土壤重金属污染的相关指导值/筛选值,并总结了我国现行土壤环境质量标准实施以来存在的问题及近年来的研究进展,对我国《土壤环境质量标准》的修订进行了探讨。