Abstract
The research on the purification effect of artificial wetland on micro-polluted river and the detection of aquatic plants showed that TP, TN, NH3-N and COD in river were significantly lower than those in untreated river, indicating that the artificial wetland has a good purification effect on these water quality indicators; Testing from different wetland types, it can be seen that the effect of removing TP, TN, NH3-N and other factors in the subsurface wetland is the best, and the artificial surface wetland is second, while the effect of removing COD factor it is close to that of artificial surface wetland. As for the effect of removing pollution factors in artificial wetlands in different seasons, it can be drawn frow the test that the removal rate of TP and TN in artificial wetlands in different seasons can be obtained: wet season > normal season > dry season; and the removal rate of NH3-N and COD is normal season > dry season > wet season. In addition to the TN factor, the water quality during the dry season and normal season is significantly better than that during the wet season. Based on the analysis of the total amount of heavy metals absorbed by three kinds of aquatic plants, it can be concluded that different plant has different effect of removing TN and TP.
Highlights
With the development of society, a large amount of industrial wastewater and domestic sewage are generated, which leads to the water pollution
It is a kind of a packed bed which is artificially laid for sewage treatment with a certain aspect ratio and bottom slope pressing soil and filler, in which are planted some aquatic plants with good function, high survival rate, long growth period, beautiful appearance and economic value, such as: cedar, Phragmites communis (Cav.), Alisma plantago-aquatica L., Canna indica L. and pupa, etc.,so that a unique animal and plant ecosystem is formed through a series of biological and chemical physical processes to purify the water[4]
In addition to the total nitrogen (TN) factor, we can conclude from the experimental data that the water quality in dry season and normal season is significantly better than the water quality in wet season
Summary
With the development of society, a large amount of industrial wastewater and domestic sewage are generated, which leads to the water pollution. China's annual sewage discharge amount is more than 40 billion tons[1], many rivers are directly discharged without purification treatment[2], and industrial wastewater is more harmful to rivers, so it is of great practical significance to purify water more effectively and improve the efficiency of water use[3]. Artificial wetlands are a natural system built for the natural simulation of sewage treatment It is a kind of a packed bed which is artificially laid for sewage treatment with a certain aspect ratio and bottom slope pressing soil and filler, in which are planted some aquatic plants with good function, high survival rate, long growth period, beautiful appearance and economic value, such as: cedar, Phragmites communis (Cav.), Alisma plantago-aquatica L., Canna indica L. and pupa, etc.,so that a unique animal and plant ecosystem is formed through a series of biological and chemical physical processes to purify the water[4]. With the artificial wetland in Shuixi river in Huangshan University as the research object, the author studied the water quality standard and the content of different heavy metals in the plants, evaluated the water quality of the artificial wetland, and analyzed the enrichment of heavy metals by different plants in the artificial wetland in order to provide a reference for improving the water treatment effect of artificial wetlands
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