高效喷淋泡沫脱硫技术及装置的应用

SO2是产生酸雨的主要气体，其主要来源于工业燃煤锅炉。以沈阳一家电厂为例，该厂选用新型高效的喷淋泡沫脱硫除尘器对锅炉排放的SO2进行治理。进入喷淋泡沫塔前的SO2平均浓度为2780mg／m^3，经脱硫后出塔平均浓度为289．3mg／m^3，去除率为89．6％。结果表明，这种有别于传统湿法的新型高效的喷淋泡沫脱硫技术及装置具有脱硫效率高、装置占地少、运行稳定、沉淀物易于回收利用等特点，对锅炉排放的SO2进行治理是非常有效的。     

中国山东电网燃煤锅炉NOx排放状况和治理技术试验研究

通过对山东电网所属发电厂锅炉NOx排放状况进行调查、测试,得出锅炉NOx排放量与煤种、炉型、燃烧器型式、运行中空气过剩系数、负荷等的关系.结果表明,山东省火力发电厂50 MW及以上容量机组2003年的NOx排放总量超过40万t(按NO2计算).控制和治理NOx排放已成为刻不容缓的重要工作.     

Ozone facilitated degradation of caffeine using Ce-TiO2 catalyst

The ozone initiated oxidation of 1,3,7-trimethylxanthine (caffeine), commonly found in wastewaters as model compound is reported using cerium (Ce)/titanium dioxide (TiO₂) as catalyst. The effect of pH and loading of ceria on titania were investigated. Effect of reaction conditions on degradation of caffeine based on their pseudo first-order rate constants were compared. The combination of catalyst Ce-TiO₂ and ozone aeration significantly enhanced the degradation of caffeine compared to uncatalysed ozonation. The oxidation of caffeine ensued via the free radical mechanism, through enhanced ozone decomposition into OH radicals. Ce/TiO₂(0.5?wt%) showed good activity in degradation of caffeine at pH 6, in both natural stream and river water samples showing about 60% total organic carbon removal in 2?h ozonation period. Using liquid chromatography-mass spectroscopy, degradation products were analysed. A reaction intermediate and one final product were positively identified. Nano-catalysts with different loadings of Ce on TiO₂ synthesized by sol-gel route were characterized by scanning electron microscope, transmission electron microscopy, BET and powder X-ray diffraction spectrum techniques. The results showed that the material retained a highly ordered mesoporous structure and possessed large surface area.     

给水厂铁铝泥构建过滤柱去除富营养化河水中过量磷

为避免因FAS释放过量有机物和氮而产生的潜在不利影响,分析了以给水厂铁铝泥(FAS)构建过滤柱处理富营养化河水的特征与机制,研究了以厌氧热处理改性后的FAS作为辅助基质(2%)构建过滤柱。结果表明：在对其他性质无影响的情况下,FAS的添加显著提高了过滤柱对水体中磷的去除率,促使出水磷浓度在整个运行期间小于0.01 mg·L-1;被FAS吸附的磷主要以NaOH提取态、HCl可提取态和残渣态存在。高通量测序分析结果表明,FAS的添加促使过滤柱中富集了Rhodoplanes、Sulfuritalea、Nitrospira、Leucobacter、Geobacter、Dechloromonas等有助于生物地球化学循环和复合污染控制的菌群。FAS作为辅助基质构建过滤柱可有效控制富营养化河水中磷污染。     

室内PM2.5浓度控制模拟分析

利用质量平衡方程建立了一次回风定风量系统室内PM2.5浓度模型,并对新风PM2.5浓度、新风量、室内污染源、过滤器效率、过滤器安装位置等因素对室内PM2.5浓度的影响进行了模拟分析。模拟结果表明：新风PM2.5浓度和室内污染源强度的变化对室内PM2.5浓度均有较大影响;新风量越大,室内PM2.5浓度受新风PM2.5浓度变化的影响越大;将过滤器分别安装在送风段、新风段和回风段,新风比为0.1时,过滤器安装在送风段效果最好,安装在新风段最差,新风比为0.8时,过滤器安装在送风段效果最好,安装在回风段最差;过滤器安装在送风段时,过滤器效率越高,室内PM2.5浓度越低,波动越小。     

臭氧-过硫酸盐工艺深度处理垃圾焚烧渗沥液

针对垃圾焚烧渗沥液经"厌氧-缺氧-好氧"生物组合工艺处理后的出水COD仍在500 mg·L-1左右,且可生化性差（B/C=0.13）的问题,研究采用"臭氧-过硫酸盐"氧化体系进一步处理,以提高其可生化性。研究了臭氧和过硫酸盐投量对该废水处理的效果影响。结果表明,臭氧浓度和S2O2-8浓度分别为19.8 g·m-3和0.4 g·L-1时,且反应20 min,出水的B/C从0.13提高到0.49,表明该氧化体系适用于深度处理垃圾焚烧渗沥液生物组合工艺处理后的出水。采用紫外-可见光谱、三维荧光光谱、红外光谱和气质联用对处理系统废水中有机物进行表征分析,表明废水在"臭氧-过硫酸盐"氧化过程中芳香族化合物发生了开环、断链等反应,芳构化程度降低,不饱和的CC键被破坏,产生CO和C—O键,并生成一些结构简单的长链烷烃。自由基捕获研究表明,氧化体系中·OH和·SO4- 2种自由基均存在,以臭氧直接氧化为主。     

EuroBionet: a pan-European biomonitoring network for urban air quality assessment

EuroBionet, the 'European Network for the Assessment of Air Quality by the Use of Bioindicator Plants', is an EU-funded cooperative project currently consisting of public authorities and scientific institutes from 12 cities in 8 countries. In 2000, the bioindicator plants tobacco (Nicotiana tabacum Bel W3), poplar (Populus nigra 'Brandaris'), spiderwort (Tradescantia sp. clone 4430), Italian rye grass (Lolium multiflorum italicum) and curly kale (Brassica oleracea acephala) were exposed to ambient air at 90 monitoring sites according to standardised methods. Visible injuries and growth parameters were assessed and the accumulation of toxic substances in leaves determined. The exposure of tobacco resulted in a gradient with low levels of ozone-induced foliar injury in N and NW Europe, and medium to high values in the southern and central regions. The results of heavy metal and sulphur analyses in rye grass samples generally showed low to very low sulphur and low to medium heavy metal concentrations in leaves. In some cities, however, local hot spots of heavy metal contamination were detected. Analyses of the PAH contents in curly kale leaves gave low to medium values, with locally elevated levels at traffic-exposed sites.     

臭氧联合混凝沉淀法去除浮选废水中有机磷

采用臭氧-混凝沉淀法去除广西某铅锌矿选矿厂尾矿库外排废水中的有机磷。有机磷主要来源于废水中残留的巯基磷酸盐类浮选药剂苯胺黑药（二苯胺基二硫代磷酸）和丁铵黑药（二丁基二硫代磷酸铵）。实验研究表明：废水中磷的存在形式90%以上为有机磷,钙盐、铁盐和铝盐无法通过混凝沉淀将有机磷去除。研究了臭氧氧化时有机磷转化为无机磷的规律,臭氧氧化可将大部分有机磷转化为无机磷。转化后的无机磷可通过硫酸铝和PAM混凝沉淀去除,尾矿库外排废水中总磷（TP）浓度由1.4~1.7下降至0.2~0.4 mg·L-1,明显低于《铅、锌工业污染物排放标准》（GB 25466-2010）中的≤1.0 mg·L-1的要求。     

喷消石灰脱除垃圾焚烧炉尾气中HCl和SO2的试验研究

在日处理200t进口流化床垃圾焚烧炉上,进行烟气喷水降温加上喷消石灰粉末脱除尾气中的酸性气体HCl和SO2的试验研究,HCl和SO2浓度由布袋除尘器出口的在线气体分析仪测得,结果表明HCl和SO2的去除率在Ca/Cl摩尔比等于9时分别为80%和20%,说明该法消石灰利用率较低,宜改为半干法脱除HCl和SO2酸性气体,以便降低吸收剂用量,提高运行的经济性.     

中国蔬菜硝酸盐和亚硝酸盐污染因素及控制研究

本文综述了近十几年来我国城市蔬菜中硝酸盐和亚硝酸盐污染的研究结果,表明随着氮肥使用量的增大,蔬菜中硝酸盐污染较为严重而亚硝酸盐污染也不容忽视。探讨了蔬菜受硝酸盐和亚硝酸盐污染的影响因素及控制对策