【摘 要】
:
In order to investigate the feasibility of pretreating the micro-polluted Yellow River raw water by constructed wetland, an experiment was conducted using a sur
【机 构】
:
School of Municipal and Environmental Engineering
论文部分内容阅读
In order to investigate the feasibility of pretreating the micro-polluted Yellow River raw water by constructed wetland, an experiment was conducted using a surface flow constructed wetland with composite plant bed. The contamination removal efficiency and their trends in the wetland treatment system were studied under different hydraulic loading rates(HLR). The contamination removal efficiencies were compared according to the seasonal change under optimum HLR. The result shows that in the same season, under different hydraulic load-system. The average removal rates of COD, TN, ammoniacal nitrogen( NH4+-N), and TP in the constructed wetland are 38.37%, 45.97%, 39.86% and 41.69%, respectively. According to China Standard for Surface Water Resources (GB3838-2002), mean effluent of COD, TN, NH4+-N and TP can nearly reach Grade Ⅲ,Grade Ⅴ, GradeⅠand GradeⅠ, respectively. Furthermore, treatment efficiency of the system in summer is obvious higher than that in other seasons. The expenditure of constructing the constructed wetland with the average treating capacity of 176 m3/d and lifetime of 20 years is 17075.00 RMB. The average disposal cost is summed up to 0.17 RMB/m3, which shows that the pretreatment of the micro-polluted Yellow River raw water by constructed wetland is feasible.
其他文献
This paper introduces the identification of the defects on the fabric by using two-double neural network and wavelet analysis. The purpose is to fit for the aut
本研究分析了五指山试验用小型猪TIMP-2基因的分子特性和可能的生物学功能.将人TIMP-2 mR-NA全长序列在猪ESTs数据库中检索获得同源性较高的ESTs,用电子克隆结合RT-PCR方法克
Objective To biodegrade the diesel pollution in aqueous solution inoculated with Mycobacterium and filamentous fungi.Methods Bacteria sampled from petroleum hyd
Water eutrophication has become a worldwide environmental problem in recent years, and understanding the mechanisms of water eutrophication will help for preven
Zinc (Zn) deficiency in animals became of interest until the 1950s. In this paper, progresses in researches on physi-ology of Zn deficiency in animals, phytate
The present study was designed to evaluate the effect of 12C6+ ion beam (10~80 Gy) on biological changes of wheat seedlings. Reactive oxygen species (ROS)-relate
A syntactic and structural matching mechanism for service discovery was put forward, which tries to exploit the underlying semantics of web services to enhance
This paper aims to use hyperspectral data to detect the spectral change caused by acid stress to a native forest type in the Three Gorges region of China.For th
在37℃条件下对不同比例的牛粪和厨余垃圾进行为期50d的联合厌氧消化试验.结果表明:(1)牛粪与厨余垃圾质量比2/1和1/2联合厌氧消化的实际产气潜能为0.66和0.71L·g-1(以挥发
New polyimide containing cvalix[4]arene moieties on the polymer backbone was successfully synthesized in N-methyl-2-pyrrolidone(NMP) by polycondensations of 3,3