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类柱试验中焚烧飞灰浸出特性研究 总被引:1,自引:0,他引:1
通过类柱试验研究焚烧飞灰的浸出规律.结果表明,随着流入系统中酸溶液体积的增加,系统pH先升高而后下降;在整个系统中,Ca的浸出质量浓度很高;Cr的浸出质量浓度要高于Cd、Cu、Zn、Pb和Ni,随着反应时间的推进,它们的浸出质量浓度都随着流入系统中酸溶液体积的增加而逐渐降低;在同一时间浸出质量浓度曲线上,从系统的上游到下游,浸出质量浓度呈增加趋势,如Cu的浸出质量浓度在系统上游(单元1)为60.2 μg/L,而在系统下游(单元10)为158.0 μg/L. 相似文献
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Xiang Li Ling Peng Yuan Hu Jing Shao Tianhe Chi 《Environmental science and pollution research international》2016,23(22):22408-22417
With the rapid development of urbanization and industrialization, many developing countries are suffering from heavy air pollution. Governments and citizens have expressed increasing concern regarding air pollution because it affects human health and sustainable development worldwide. Current air quality prediction methods mainly use shallow models; however, these methods produce unsatisfactory results, which inspired us to investigate methods of predicting air quality based on deep architecture models. In this paper, a novel spatiotemporal deep learning (STDL)-based air quality prediction method that inherently considers spatial and temporal correlations is proposed. A stacked autoencoder (SAE) model is used to extract inherent air quality features, and it is trained in a greedy layer-wise manner. Compared with traditional time series prediction models, our model can predict the air quality of all stations simultaneously and shows the temporal stability in all seasons. Moreover, a comparison with the spatiotemporal artificial neural network (STANN), auto regression moving average (ARMA), and support vector regression (SVR) models demonstrates that the proposed method of performing air quality predictions has a superior performance. 相似文献
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Peipei Wang Lili Zhang Li Liu Ling Chen Hongwen Gao Lingling Wu 《Environmental science and pollution research international》2015,22(21):16423-16433
Toxicity evaluation is an important segment in sediment quality monitoring in order to protect aquatic organisms and human health. The purpose of this study is to assess the toxicity of sediments from three sediment cores in Yangtze River Estuary, China, using the zebrafish (Danio rerio) embryo tests. Fertilized zebrafish eggs were exposed to both whole sediments and sediment organic extracts prepared from collected sediments, in order to provide a comprehensive and realistic insight into the bioavailable toxicity potential of the sediments. As end points, development parameters (mortality, hatching rate, and abnormality) in the developing embryos were recorded during the 96-h exposure. The results showed that some samples increased mortality, inhibited the hatching of embryos, and induced morphological abnormalities. The embryonic toxicities presented serrated changes and irregular distribution with depth, which may be related to hydrodynamic effect and unstable environmental input. However, lethal and sub-lethal effects were more significant at the sub-surface sediments (10~40 cm), which indicated that the pollution is more serious in recent decades. 相似文献
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微波消解-流动注射分光光度法测定总氮和总磷 总被引:2,自引:0,他引:2
以碱性过硫酸钾溶液为消解液,采用微波消解-流动注射分光光度法测定水中总氮和总磷。在碱性过硫酸钾溶液中氢氧化钠质量浓度为9.6g/L、微波功率为320W、消解管长度为16m的条件下,总氮和总磷的检出限分别为0.040m g/L和0.020mg/L,线性范围分别为0.040~3.500mg/L和0.020~2.500mg/L,相对标准偏差分别为1.6%和1.0%。微波消解-流动注射分光光度法应用于河水、湖水、化工废水等实际水样中总氮和总磷的测定,加标回收率分别为95.7%~98.1%和97.2%~102.2%。 相似文献
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