Campus Sewage Treatment in Multilayer Horizontal Subsurface Flow Constructed Wetlands: Nitrogen Removal and Microbial Community Distribution     

《洁净——土壤、空气、水》2017,45(11)

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Abatement of Amoxicillin,Ampicillin, and Chloramphenicol From Aqueous Solutions Using Activated Carbon Prepared From Grape Slurry     

Rumbidzai Chitongo  Beatrice O. Opeolu  Olatunde S. Olatunji 《洁净——土壤、空气、水》2019,47(2)

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Trapping Ionic Mercury Using Different Adsorbents     

Adedamola Titi Ojedokun  Abraham Olusegun Oluwole  Olugbenga Solomon Bello 《洁净——土壤、空气、水》2019,47(12)

Of recent, adsorption process has gained a lot of attention as a cheap and effective means of removing trace metals from wastewater prior to discharge into water bodies. Being flexible in design and operation, the process has enabled an optimal recovery of trace metals such that the treated effluents meet the desired standards for waste disposal. Mercury is a toxicant released into the environment from natural and anthropogenic sources. It is notorious for having an unusual tendency to bio‐accumulate and persist in the food chain. Presence of mercury in food, especially those of aquatic sources has drastic implications on human health. Therefore, efforts have been made to develop and optimize low‐cost activated carbon (AC) as adsorbents for scavenging mercury from aqueous effluents. Herein, how mercury accumulates across the food chain, its health implications, and the recent advancement in the use of low‐cost ACs as adsorbent for trapping mercury from wastewater are highlighted. Relationship between the mercury removal efficiency and the surface morphology of the adsorbents as well as the influence of prevailing experimental condition on the sorption process were addressed. Challenges and future prospects of the use of low‐cost adsorbents in addressing mercury pollution in the environment are discussed.  相似文献   

不同反应条件对铜蓝晶体生长的影响     

张玉珠  彭书传  陈天虎  刘海波  陈冬  马文婕 《岩石矿物学杂志》2020,39(1):113-119

在环境温度下,水中Cu^2+与铁硫化物矿物交换反应形成的铜蓝的结晶度可以影响Cu^2+的回收效率及交换反应的完全程度。本文利用Cu Cl2和Na2S直接反应生成铜蓝,讨论了不同p H值、反应时间、反应温度、反应物浓度、反应物滴加速度、外加电解质浓度等条件对铜蓝晶体生长的影响,并采用XRD、TEM和EDX方法对铜蓝结晶度和形貌进行了表征,用Scherrer公式计算了晶体的平均粒径。结果表明,反应p H值越低,时间越长,温度越高,反应物滴加速度越慢,越有利于铜蓝晶体生长;铜蓝晶体结晶度随着反应物浓度的增加呈先增后减的趋势,而在不同外加电解质浓度条件下表现出不同的结晶度。  相似文献   

金山污水排海对纳污海域水质影响的数学模拟   总被引：3，自引：0，他引：3  

国峰  张海平  李阳  韦鹤平 《海洋学研究》2007,25(4):81-85

采用数值模拟的方法,计算和分析了上海市金山区水域无污水排放、放流管深海正常排放、岸边紧急排放和污水未经处理直接排放4种不同排放方式对纳污海域水质的影响。结果表明,在金山邻近海域的水动力条件下,上述4种排放方式中,岸边紧急排放对近岸海域的污染最严重。在事故排放这一最不利工况时,金山排海工程所选定的排放口,紧急排放对纳污海域环境的影响仍然是有限的,不会影响到小金山岛等敏感水域的水质。  相似文献   

孔石莼净化高盐废水海藻叶表微生态分析     

卢文娟  吕剑  武君  张宇轩  崔德杰 《盐湖研究》2020,28(1)

孔石莼是一种大型潮间带绿藻,在去除氮磷营养盐方面已发挥显著作用,但目前尚不清楚其在净化高盐废水时的叶表微生态情况。本研究利用孔石莼处理高盐废水,通过高通量测序技术分析了孔石莼表面和废水中的微生物群落分布特征。研究结果表明：孔石莼表面的微生物多样性和微生物丰度均高于废水。孔石莼叶表优势菌属包括芽孢杆菌属Bacillus、微小杆菌属Exiguobacterium、虚构芽孢杆菌属Fictibacillus和短芽孢杆菌属Brevibacillus,其中芽孢杆菌属Bacillus最为丰富,占比超过整体的70%。废水中微生物以芽孢杆菌属Bacillus与微小杆菌属Exiguobacterium为主,二者占比总和超过整体的99%。相较于水体的流动性,孔石莼表面更利于微生物的生长与分布。  相似文献   

竹环填料生物滤器在两种海水鱼养殖废水处理中的运行效果及微生物群落分析   总被引：2，自引：0，他引：2  

徐洋  高喜燕  张延青  刘志培  刘鹰 《海洋科学》2010,34(3):26-31

以点带石斑鱼(Epinephelus malabaricas)、半滑舌鳎(Cynoglossus semilaevis)养殖排放水为处理对象,在生产现场研究了竹环填料生物滤器处理高盐度、低氨氮负荷海水养殖废水的运行效果以及挂膜阶段和稳定运行阶段微生物群落变化规律。结果表明,点带石斑鱼养殖废水进水氨氮质量浓度为0.93～1.33 mg/L,氨氮去除率达到27%～39%,挂膜时间需45 d;半滑舌鳎养殖废水进水氨氮质量浓度为0.38～0.52 mg/L,氨氮去除率达到20%～30%,挂膜时间需65 d。另外,对生物滤器挂膜阶段和稳定运行阶段的氨氧化细菌数量和亚硝酸氧化细菌数量进行了统计,氨氧化细菌的数量在点带石斑鱼和半滑舌鳎养殖排放水处理系统中分别达到104～105 CFU/mL和103 CFU/mL,亚硝酸氧化细菌数量则分别达到104 CFU/mL和103 CFU/mL,并分析了温度、进水氨氮负荷、反硝化作用对半滑舌鳎养殖废水生物滤器亚硝酸盐积累现象的影响。  相似文献   

Dyeing and printing wastewater treatment using fly-ash coated with chitosan     

陈忻  孙恢礼 《中国海洋湖沼学报》2009,27(4):875-881

Printing and dyeing industry is a considerable source of environmental contamination. In this study treatment of printing and dyeing wastewater with a new type of sewage treatment agent, fly-ash coated with chitosan particles (FCCP), was examined. The effects of pH, stirring time, sedimentation time and temperature on color, COD, turbidity and NH₃-N removal were determined. The optimum dosage of FCCP and the influence of individual factors on removal efficiency were tested. The optimum parameters determined using the L₁₆(4⁵) orthogonal experiment were as follows: FCCP (weight ratio of chitosan to fly-ash 1:6) dosage, 4 g·L⁻¹; temperature, 35°C; pH, 4. The stirring time and sedimentation time were 20 min and 5 h, respectively. Under these optimum conditions, the color, COD and NH₃-N removal ratios were 97%, 80% and 75%, respectively.  相似文献   

贵州水银洞卡林型金矿床首次发现大量次显微-显微可见自然金颗粒   总被引：2，自引：0，他引：2  

苏文超  张弘弢  夏斌  张兴春  胡瑞忠  周国富  夏勇 《矿物学报》2006,26(3):257-260

在贵州水银洞卡林型金矿床原生富矿石的一条含砷黄铁矿细脉中发现有100余粒次显微-显微自然金颗粒(0.1~6μm),并具有清晰的显微岩相学结构。提出了该类型金矿次显微-显微可见自然金颗粒的形成过程可能与含Au热液-岩石相互作用过程中含Fe碳酸盐矿物溶解释放Fe的大量硫化物化而导致热液中Au的过饱和有关,含Fe碳酸盐赋矿围岩是形成高品位大型卡林型金矿床最重要的控制因素之一。  相似文献   

MnO2-UV联用光化学降解苯酚废水的初步研究     

冯雄汉  张嵚  谭军凤  文慧  谭文峰  刘凡 《矿物岩石地球化学通报》2006,25(4):319-323

探讨了人工合成的高价锰氧化物与紫外光(UV)联用时降解苯酚废水的特性。结果表明,氧化锰矿物在无UV时对苯酚的降解能力差异大,1 g/L的氧化锰4 h对200 mg/L苯酚废水的降解率和COD去除率分别为:锰钾矿97.51%、酸性水钠锰矿89.07%、碱性水钠锰矿11.36%、钙锰矿9.67%;锰钾矿87.79%、酸性水钠锰矿53.11%、碱性水钠锰矿6.42%、钙锰矿1.43%。UV光照下,氧化锰矿物对苯酚的降解率有不同程度的提高,且表现出显著的表面光催化性质,增加了苯酚的深度降解,COD去除率显著提高。UV下氧化锰4 h对苯酚的降解率分别为:锰钾矿99.48%、酸性水钠锰矿91.86%、碱性水钠锰矿40.15%、钙锰矿35.95%);COD的去除率分别为:锰钾矿98.11%、酸性水钠锰矿68.45%、钙锰矿27.57%、碱性水钠锰矿24.27%。MnO2-UV联用时降解苯酚可能包括两种主要作用机制:氧化锰矿物的直接化学氧化降解和UV下MnO2的表面光催化降解。  相似文献