Application of Eichhornia crassipes and Pistia stratiotes for treatment of urban sewage in Israel

The effectiveness of sewage purification by aquatic plants, such as water hyacinth (Eichhornia crassipes) and water lettuce (Pistia stratiotes), was tested on laboratory and pilot scales. Cascade and semi-continuous pilot experiments verified that the plants are capable of decreasing all tested indicators of water quality to levels that permit the use of the purified water for irrigation of tree crops. This applies to biochemical oxygen demand (BOD), chemical oxygen demand (COD), total suspended solids (TSS), and turbidity. The laboratory-scale tests confirm the capacity of the plants to reach and hold reasonably low levels of BOD (5-7 mg L(-1)) and COD (40-50 mg L(-1)) and very low levels of TSS (3-5 mg L(-1)) and turbidity (1-2 NTU). In the experimental pilot setup, with circulation, COD decreased from 460 to 100 mg L(-1) after 2.5-4 days of treatment, while 6-7 days were required to this end without circulation. This doubled the active pond area and provided a two-level hydraulic loading (8 and 12 L min(-1)) with circulation that proved to be effective during the summer as well as the winter season. The outflow concentrations were 50-85 mg L(-1) of COD and 4-6 mg L(-1) of BOD. The results show that the use of this free water surface flow system (FWS) and its low maintenance system for treatment of urban and agricultural sewage is a viable option.     

市区主要交通路口机动车排气污染现状调查及防治对策

通过对主要交通路口汽车排气污染现状调查,证明交通路口是城市中空气质量最差地段,特别是对人体危害较火的总烃、一氧化碳、氮氧化物污染尤为严重;提出改善城区道路建设、改善燃料质量等防治措施。     

沈阳地区一次颗粒物重污染天气过程的气象成因分析

为探究沈阳地区重污染天气成因,文章利用地面、高空气象观测资料、风廓线雷达资料、NECP再分析资料以及大气污染物监测资料,对2019年3月1～6日沈阳地区出现的一次持续性重污染天气过程,探讨了大气污染物质量浓度、地面气象要素变化特征、大气环流配置与外来输送等特征.结果表明,均压场、地面风场弱及辐合、高温高湿是本次重污染天...     

2019年秋季三亚市一次典型臭氧污染个例气象成因解析

三亚市位于海南岛最南端,旅游资源丰富,生态环境良好,是海南建设国际旅游岛和国家生态文明试验区的重要城市之一。2019年秋季三亚市出现的一次臭氧(Ozone,O₃)污染过程,为科学认识三亚市此次O₃污染特征及气象学成因,也为进一步开展O₃污染预警预报和科学治理提供技术支撑,利用2019年11月1—6日三亚市生态环境局对外发布的大气污染物数据,以及地面常规观测数据,结合ECMWF发布的第5代资料(the fifth generation ECMWF reanalysis data,ERA5),采用相关分析和后向轨迹模型对其进行分析。结果表明,11月4日和5日O₃-8 h(臭氧最大8 h滑动平均)分别为162μg·m^-3和180μg·m^-3,超标百分比为101.25%和112.50%。5日O₃-1 h(臭氧最大1 h平均)达到了203μg·m^-3,超标百分比为101.50%。14:00—19:00是O₃     

污染源水质自动监测系统数据质量保障措施研究

近年来,在我国工业化规模不断扩大、工业项目不断增多的影响下,水资源的污染问题愈发严峻,对人们的生命健康安全造成了巨大影响。所以,水质监测部门要充分利用先进的水质监测技术和设备,对污染源水质实施连续不间断的监测,有效提高水质监测数据质量。本文主要提出了几点保障污染源水质自动监测系统数据质量的措施,供相关人员借鉴采纳。     

福建某石化企业废气排放及土壤污染现状调查及研究

石化工业园区造成的累积环境影响随着其蓬勃发展而逐步显现,其污染物质在周边土壤与河流底质中的积累影响较为显著[1],目前,我国已有不少关于化工园区环境污染的研究,多集中在水和空气污染问题的研究[2-5],较少针对石油化工园区土壤累积影响的研究[6-7]。本文以我省某石化园区为调查对象,通过该园区废气污染物排放监测及土壤环境现状调查,了解我省新型石化工业园区环境污染状况,对提高石化行业土壤污染防控有重要指导意义。     

水泥行业NOx污染防治及减排措施研究

环境污染问题是现代社会面临的一项重要问题。NOx作为大气污染物的重要组成部分之一,我国现行规定水泥行业的NOx排放限值为400mg/Nm^3,这与国际标准之间尚存在较大的差距。近年来,随着社会经济的快速发展,人们对环保的要求也越来越高,因此水泥行业必须要更加开展好NOx污染防治及减排工作。本文主要针对水泥行业NOx污染防治及减排措施进行了研究,希望有助于提升相关工作质量,促进环境保护。     

不同减排情景下城市机动车污染防治措施研究

机动车数量的增加严重威胁城市环境,本文在不同减排情境下,开展城市机动车污染防治措施研究。使用清洁能源代替不可再生能源作为机动车动力燃料;明确责任制度,强化机动车管理体制,提升空气质量;布设城市监控设备优化交通结构,减少排放源;完善法律制度,协调经济发展与环保关系;发展公共交通,倡导绿色出行理念,降低城市机动车尾气排放污染。     

房屋建筑施工中环境污染防治措施研究

本文主要从施工周边环境与结构层次、光污染与水污染的防治措施、噪音污染、固体废弃物污染以及扬尘污染的处理方法等方面,深入分析了房屋建筑施工中环境污染防治措施,以期为如何防治房屋建筑施工中的环境污染问题提供一定的理论借鉴。     

Fine Particulate Pollution Characteristics in Jinan City

The characteristics of fine particulate pollution(PM10and PM25)were measured at urban and suburban sites in Jinan during the 2008-2009 heating and non-heating seasons.The results showed that PM10 and PM2.5 pollution was quite serious,and PM mass concentration was higher during the heating season than the non-heating season.PM was the highest in the chemical factory and lowest in the development zone.The mass concentrations of PM10 and PM2.5 were linearly related,and the mass concentration ratio of PM2.5/PM10 was up to 0.59 in urban areas.PM pollution in Jinan was related to local meteorological factors: PM2.5 mass concentration and humidity were positively correlated,and PM2.5mass concentration was negatively correlated with both click on the temperature and wind speed,although wind speed varied more.