Observation and analysis of atmospheric volatile organic compounds in a typical petrochemical area in Yangtze River Delta, China

Volatile organic compounds (VOCs) are a kind of important precursors for ozone photochemical formation. In this study, VOCs were measured from November 5th, 2013 to January 6th, 2014 at the Second Jinshan Industrial Area, Shanghai, China. The results showed that the measured VOCs were dominated by alkanes (41.8%), followed by aromatics (20.1%), alkenes (17.9%), and halo-hydrocarbons (12.5%). The daily trend of the VOC concentration showed a bimodal feature due to the rush-hour traffic in the morning and at nightfall. Based on the VOC concentration, a receptor model of Positive Matrix Factorization (PMF) coupled with the information related to VOC sources was applied to identify the major VOC emissions. The result showed five major VOC sources: solvent use and industrial processes were responsible for about 30% of the ambient VOCs, followed by rubber chemical industrial emissions (23%), refinery and petrochemical industrial emissions (21%), fuel evaporations (13%) and vehicular emissions (13%). The contribution of generalized industrial emissions was about 74% and significantly higher than that made by vehicle exhaust. Using a propylene-equivalent method, alkenes displayed the highest concentration, followed by aromatics and alkanes. Based on a maximum incremental reactivity (MIR) method, the average hourly ozone formation potential (OFP) of VOCs is 220.49?ppbv. The most significant source for ozone chemical formation was identified to be rubber chemical industrial emissions, following one by vehicular emission. The data shown herein may provide useful information to develop effective VOC pollution control strategies in industrialized area.     

Characterization particulate matter from several Chinese cooking dishes and implications in health effects

Cooking fume produced by oil and food at a high temperature releases large amount of fine particulate matter(PM) which have a potential hazard to human health. This chamber study investigated particle emission characteristics originated from using four types of oil(soybean oil, olive oil, peanut oil and lard) and different kinds of food materials(meat and vegetable). The corresponding emission factors(EFs) of number, mass, surface area and volume for particles were discussed. Temporal variation of size-fractionated particle concentration showed that olive oil produced the highest number PM concentration for the entire cooking process. Multiple path particle dosimetry(MPPD) model was performed to predict deposition in the human respiratory tract. Results showed that the pulmonary airway deposition fraction was the largest. It was also found that particles produced from olive oil led to the highest deposition. We strongly recommend minimizing the moisture content of ingredients before cooking and giving priority to the use of peanut oil instead of olive oil to reduce human exposure to PM.     

污染源在线监测系统（CEMS）的验收比对监测

随着节能减排的开展,各重点污染源企业,特别是SO2等标排放负荷较大的热电、钢铁等使用燃煤锅炉的企业,都按照环保局的要求安装了污染源在线监测系统CEMS。CEMS数据的可靠性、正确性、稳定性对于污染减排有着决定性作用,CEMS已成为一种最有效的定量和监控管理手段。本文介绍了CEMS系统的组成及功能,以及验收监测比对法规依据,并根据《固定污染源烟气排放连续监测技术规范》（HJ／T75—2007）（试行）和《固定污染源烟气排放连续监测系统技术要求及检测方法》（HJ／T75—2007）（试行）验收监测比对指标,简要说明了验收比对的方法并分析了在实际监测中遇到的问题,提出了需要注意的事项。     

天津港运输船舶大气污染物排放清单

运输船舶产生的大气污染物对港口大气环境有重要影响,但我国对这部分内容的研究却相当薄弱.本文首先对天津港运输船舶的总体情况进行调研,根据其排放控制技术水平合理选择了排放因子;而后采用基于燃料消耗的方法,对2006年天津港运输船舶排放的NOx、HC、CO和PM_(10)进行了计算,建立了天津港运输船舶大气污染物的排放清单;最后对2010年和2020年天津港的运输船舶大气污染排放情况进行了预测.该清单的估算和预测可以为加强排放控制和制定相关法规提供重要依据.     

Volatile organic compound emissions from straw-amended agricultural soils and their relations to bacterial communities: A laboratory study

A laboratory study was conducted to investigate volatile organic compound(VOC) emissions from agricultural soil amended with wheat straw and their associations with bacterial communities for a period of 66 days under non-flooded and flooded conditions. The results indicated that ethene, propene, ethanol, i-propanol, 2-butanol, acetaldehyde, acetone,2-butanone, 2-pentanone and acetophenone were the 10 most abundant VOCs, making up over 90% of the total VOCs released under the two water conditions. The mean emission of total VOCs from the amended soils under the non-flooded condition(5924 ng C/(kg·hr)) was significantly higher than that under the flooded condition(2211 ng C/(kg·hr)). One "peak emission window" appeared at days 0–44 or 4–44, and over 95% of the VOC emissions occurred during the first month under the two water conditions. Bacterial community analysis using denaturing gradient gel electrophoresis(DGGE) showed that a relative increase of Actinobacteria, Bacteroidetes, Firmicutes and γ-Proteobacteria but a relative decrease of Acidobacteria with time were observed after straw amendments under the two water conditions. Cluster analysis revealed that the soil bacterial communities changed greatly with incubation time, which was in line with the variation of the VOC emissions over the experimental period. Most of the above top 10 VOCs correlated positively with the predominant bacterial species of Bacteroidetes, Firmicutes and Verrucomicrobia but correlated negatively with the dominant bacterial species of Actinobacteria under the two water conditions. These results suggested that bacterial communities might play an important role in VOC emissions from straw-amended agricultural soils.     

海南岛近岸海域环境容量与纳污总量分析

通过对海南岛"十二五"期间近岸海域纳污总量、环境质量状况及环境容量比较分析,得出各主要排污区环境容量的剩余环境容量。结果表明,全省主要污染物化学需氧量入海量仅占环境容量的2.6%,氨氮占环境容量的26.6%,虽然全省近岸海域环境基本未受污染物入海量影响,仍有较大的纳污空间,可利用的环境容量非常充裕。为避免出现排污达标但环境质量下降的状况,提出建立近岸海域主要污染物总量控制制度,由浓度控制到总量和浓度控制并存。     

山东省汽车喷涂行业VOCs排放特征研究

采用气袋采样-气相色谱/质谱法,采集并分析了山东省内小型通用车、货车、电动商务车以及半挂车4类典型汽车喷涂企业挥发性有机物(VOCs)的排放特征。结果表明:山东省汽车喷涂企业中VOCs排放总量以及检出数量排序为:半挂车喷涂企业电动商务车喷涂企业货车喷涂企业小型通用车喷涂企业。各类汽车喷涂企业喷漆以及烘干车间排放的VOCs大多以苯类物质为主(小型通用车面漆烘干车间除外),在小型通用车以及半挂车涂装企业废气中烷烃类物质占比较大。不同企业以及各企业不同工序之间特征VOCs排放浓度有较大差别,喷漆车间特征VOCs浓度要远高于烘干车间。     

Estimating emissions from crop residue open burning in China based on statistics and MODIS fire products

With the objective of reducing the large uncertainties in the estimations of emissions from crop residue open burning, an improved method for establishing emission inventories of crop residue open burning at a high spatial resolution of 0.25°× 0.25° and a temporal resolution of1 month was established based on the moderate resolution imaging spectroradiometer(MODIS) Thermal Anomalies/Fire Daily Level3 Global Product(MOD/MYD14A1). Agriculture mechanization ratios and regional crop-specific grain-to-straw ratios were introduced to improve the accuracy of related activity data. Locally observed emission factors were used to calculate the primary pollutant emissions. MODIS satellite data were modified by combining them with county-level agricultural statistical data, which reduced the influence of missing fire counts caused by their small size and cloud cover. The annual emissions of CO_2, CO, CH_4,nonmethane volatile organic compounds(NMVOCs), N_2O, NO_x, NH_3, SO_2, fine particles(PM2.5),organic carbon(OC), and black carbon(BC) were 150.40, 6.70, 0.51, 0.88, 0.01, 0.13, 0.07, 0.43,1.09, 0.34, and 0.06 Tg, respectively, in 2012. Crop residue open burning emissions displayed typical seasonal and spatial variation. The highest emission regions were the Yellow-Huai River and Yangtse-Huai River areas, and the monthly emissions were highest in June(37%).Uncertainties in the emission estimates, measured as 95% confidence intervals, range from a low of within ±126% for N_2O to a high of within ± 169% for NH_3.     

矿井水中氟化物及放射性核素去除研究

对淮北芦岭矿区饮用水源中氟化物及放射性核素去除工艺与机理进行了探讨,试验证明以聚合铝作混凝剂的混凝沉淀方法对去除氟化物及放射性核素非常有效,当PAC用量为20mg/L时,饮水中氟化物含量由1.85mg/L降至0.78mg/L?总α由0.13Bq/L降至0.03Bq/L?总β由0.26Bq/L降至0.18Bq/L?      

徐州市推行排污许可证制度对排污系数法的应用

重点论述了徐州市锅炉、炉窑尘排放系数研究的指导思想和方法,给出了各类燃煤设备尘排放系数,并成功地应用于排污许可证的全过程。将产品单耗、排放系数、生产能力密切结合,提供了快速简便、可操作、比较符合实际的计量监侧手段,较好地解决了排污许可证实施中所谓“计量难”的问题,具有推广和应用价值。