镉"加标"沉积物对泥鳅(Misgurnus anguillicaudatus)生物毒性研究

选择泥鳅(Misgurnus anguillicaudaus)作为受试生物,以泥鳅死亡率、血液红细胞数量、红细胞体积、红细胞微核率和核异常率作为测试指标,考察了沉积物中"加标"金属镉(Cd)的毒性状况,探讨了水体沉积物中重金属的生物毒性影响.结果表明:高有机质的粘土粉砂性沉积物能够有效吸附重金属镉;镉加标暴露组泥鳅的死...     

胶结液注入轮数和体积对微生物加固粉土的影响∗

通过微生物诱导碳酸钙沉积可以将松散土颗粒胶结成整体从而达到加固目的。胶结液的注入轮数和每轮使用的胶结液体积会影响加固效果,但目前关于这方面的研究还不充分。以海相粉土为处理对象,通过室内试验来研究胶结液的注入轮数和体积对加固效果的影响。改变胶结液注入轮数的试验结果表明:随着注入轮数的增加,试样中沉积生成的碳酸钙逐渐增多,碳酸钙的分布比较均匀,加固后的无侧限抗压强度逐渐提高;但当胶结液的注入达到一定轮数后,强度的增长幅度逐渐减缓。改变每轮胶结液体积用量的试验结果表明:胶结液体积的增加会带来碳酸钙数量的增加和强度的提高,但当胶结液体积从1.5Vv(孔隙体积)增加至2Vv后,效果改善不明显。从钙离子用量与无侧限抗压强度的关系也表明,每轮注入的胶结液体积应选择1.5Vv。     

Multilevel air quality evolution in Shenyang: Impact of elevated point emission reduction

Visibility observed at different altitudes is favorable to understand the causes of air pollution. We conducted 4-years of observations of visibility at 2.8 and 60 m and particulate matter(PM) concentrations from 2015 to 2018 in Shenyang, a provincial city in Northeast China. The results indicated that visibility increased with the increasing height in winter(especially at night), and decreased with height in summer(especially at the daytime). PM concentration exhibited opposite vertical variati...     

好氧颗粒污泥技术处理味精废水

采用好氧颗粒污泥技术处理味精废水.实验结果表明:前置缺氧段对反应器脱氮效果影响较小,脱氮过程主要是在好氧段实现;曝气段的最佳工艺条件为曝气量0.38 m3/h,曝气时间5.5 h;在进水COD、p(NH3-N)和TN分别为l000.00～1300.00,70.00～130.00,100.00～200.00 mg/L的条件下,COD、NH3-N和TN的去除率可分别维持在90％、99％和85％以上,实现了味精废水的高效脱氮处理.有机物主要在曝气初期的1.5 h内被去除,其在微生物体内以聚β-羟基丁酸形式储存,以提供反硝化过程中所需要的碳源.与普通SBR相比,接种好氧颗粒污泥后的反应器对味精废水具有更好的处理效果.     

Review and prospects of mining chemical dust suppressant: classification and mechanisms

Environmental Science and Pollution Research - Coal mine pollution is a serious threat to the mine safe production and occupational health of miners. Chemical dust suppression can effectively...     

Impact of regional temperature on the adoption of electric vehicles: an empirical study based on 20 provinces in China

Environmental Science and Pollution Research - The development of electric vehicles (EVs) is not only a necessary path for China to move from a big country to a powerful country in automobile...     

Humification process enhancement through relative abundance promotion of Talaromyces and Coprinopsis by inoculated Phanerochaete chrysosporium during the secondary fermentation of composting

Environmental Science and Pollution Research - To explore the mechanism of Phanerochaete chrysosporium (P. chrysosporium) inoculation driving the humification process of maize straw composting, the...     

Effects of green spaces on alleviating mortality attributable to PM2.5 in China

Environmental Science and Pollution Research - Increasing research suggested that green spaces are associated with many health benefits, but evidence for the quantitative relationship between green...     

臭氧和氮肥交互对小麦干物质生产、N、P、K含量及累积量的影响

利用中日合作建立的亚洲首个稻麦轮作开放式臭氧浓度升高（ozone-free air controlled enrichment,O3-FACE）平台,选取小麦品种（Tritcium aestivum）扬麦16为试材,研究了不同臭氧和氮肥水平下,小麦不同部位干物质量以及N、P、K质量分数的变化。结果表明,臭氧胁迫下,常氮水平小麦根、叶和穗干物质量以及根冠比与对照相比均显著降低,降幅分别为37.4%、17.4%、12.8%、29.8%,而增施氮肥后,小麦根叶穗及根冠比与常氮下相比均显著增加,增幅分别为60.5%、23.2%、10.7%、43.6%;常氮条件下,臭氧浓度升高明显降低N、P、K累积量及成熟期叶中N、P、K质量分数,降幅分别为10.93%、11.65%、7.64%、23.87%、14.81%、14.9%,而成熟期穗中N、P、K质量分数明显增加,增幅分别为6.15%、10.34%、13.12%,增施氮肥后,N、P、K累积量及小麦叶中N质量分数与常氮相比明显增加,增幅分别为15.58%、11.91%、9.00%、10.74%,叶中P、K质量分数也有所增加但增幅很小,而增施氮肥对其他部位的N、P、K质量分数影响不大。臭氧和氮肥对茎部干质量及N、P、K质量分数影响均不明显。总之,增施氮肥对小麦在臭氧胁迫下的生物量累积和养分累积有一定的缓解作用。     

生活垃圾填埋场渗滤液处理技术研究

根据处理工艺原理的不同 ,分别介绍生化和物化处理技术、膜处理技术、土地处理技术和蒸发处理技术等处理工艺研究与应用的进展情况 ,同时根据我国填埋场渗滤液的产生特点和处理处置现状 ,展望了我国渗滤液处理工艺的发展趋势。