香蒲湿地对泰达高盐再生水景观河道水质净化效果的研究

通过香蒲湿地对天津泰达景观河道水体污染物去除的室内试验,研究了香蒲湿地对泰达高含盐再生水的净化效果以及水力停留时间对水质净化效果的影响,考察了不同污染物的去除情况。结果表明,水力停留时间对水体中COD、TN、NH3-N、NO3-N、TP、PO4-P的净化效果有明显的影响,各主要污染物随HRT的变化范围如下:COD去除率10.00%￣44.89%;TN的去除率为17.20%￣71.00%、NH3-N的去除率为30.28%￣74.06%、NO3-N的去除率为18.00%￣74.00%、TP的去除率为62.98%￣90.01%、PO4-P的去除率为64.99%￣92.01%,TDS在3900￣4800mg.L-1范围内变化对香蒲及其水处理系统净化效果没有影响,香蒲湿地pH值均比空白湿地低。由于香蒲根系具有吸收与分解污染物质的作用,在水体中种植香蒲能明显改善水质净化效果。在此基础上,通过种植香蒲,对泰达景观河道水体污染物去除收到明显的效果,同时为防治泰达再生水景观河道水体富营养化提供了理论依据和技术指导。

水葱湿地对泰达景观河道水质净化特性研究

通过水葱湿地对天津泰达景观河道水体污染物去除的室内试验研究,考察了不同污染物的去除情况。COD的去除率20.38%～40.25%;TN的去除率为39.78%～68.16%、NH3-N的去除率为53.94%～76.71%、NO3--N的去除率为39.78%～74.41%、TP的去除率为81.29%～88.27%、PO4-P的去除率为82.76%～89.61%以及TD(S先上升后下降)、pH(由8.25下降到7.30)变化情况.。在此基础上,得出了通过种植水葱,对泰达景观河道水体污染物去除效果是明显的,同时为防治泰达再生水景观河道水体富营养化的发生发展提供理论依据和技术指导。

Intensive photocatalytic activity enhancement of Bi5O7I via coupling with band structure and content adjustable BiOBrxI1-x

Band structure and component content are the key factors for determining the activity of semiconductor heterojunction. In this study, a novel Bi5O7I/BiOBrxI1-x heterostructure was synthesized by a simple hydrobromic （HBr） acid etching method through transforming partial of Bi5O7I to I ion doped BiOBr （BiOBrxI1-x） at room temperature without adding extra dopant. Both the band structure and component content of Bi5O7I/BiOBrxI1-x alter with the additive HBr acid. The Bi5O7I/BiOBrxI1-x （S3.0） sample exhibits the best photocatalytic activity, 6 times higher than that of pure Bis071, for the degradation of methyl orange under visible-light （2 〉 420 nm）. The activity enhancement of Bi5O7I/BiOBrxI1-x is primarily ascribed to the improved separation efficiency of photocharges, originated from the adjustable band structure and component content, The significant findings of this paper provide a facile way to construct highly efficient semiconductor heterojunction via playing the synergetic effect of adjustable band struc- ture and component content for purifying organic pollutants in wastewater.