Study On The Decontamination Performance Of Heavy Metal-Cu In Sewage By The Micro-Aeration Enhanced Ecological Floating Bed

With the current level of industrialization in China continues to deepen, natural water pollution by heavy metals has become increasingly serious. At present, China has a large number of mining, smelting, electroplating and other industrial wastewater without treatment or treatment is not up to the standard will be directly discharged into natural water, which is the culprit of leading Organics (CODCr), Nitrogen (N), Phosphorus (P), Suspended Solids (SS) and heavy metal pollutants seriously exceeded in natural water. The treatment of heavy metal pollution in natural water is imminent. The traditional treatment of heavy metal pollutants is not only higher technical difficulty, complex process, the process of governance costly, but it is difficult to apply to large areas of heavy metal pollution control of natural water. In recent years, the ecological floating bed technology, which makes the plants as the main to achieve green repair, has a good development. It depends on the uptake, accumulation and assimilation of the plants dealing with toxic and hazardous pollutants in the environment, and it can be a good treatment of variety of natural water which polluted by heavy metals. Compared with the traditional heavy metal pollutants treatment methods, ecological floating bed of ecological restoration techniques has the advantages of lower cost, operation simple, relatively easy to manage, effective treatment, treatment cycle faster and so on. Therefore, the ecological floating bed technology is used to achieve treatment of heavy metal pollution of water, and to achieve green repair of the water. It has a high theoretical value and good prospects for practical applications.On the basis, this paper prepossessed a new and improved static sewage treatment simulation experimental platform (micro-aeration system+combined filler+ecological floating bed). Depending on the experimental platform, the paper researched the removal of Cu2+of heavy metals in sewage under different experimental conditions, which contributed to a more comprehensive understanding of the micro-aeration enhanced ecological floating bed technology and water purification process, and provided a theoretical foundation for its applied to practical project. The paper also provided a theoretical basis and design support for the micro-aeration enhanced ecological floating bed being used to control and repair pollution of urban sewage, rivers, lakes, and reservoirs. The following results were obtained:(1) Micro-aeration enhanced ecological floating bed, Enhanced ecological floating bed and Traditional ecological floating bed had a certain ability to remove the Cu2+of heavy metals in the sewage. The micro-aeration enhanced ecological floating bed had the strongest ability to remove the Cu2+, followed by the enhanced ecological floating bed, the traditional ecological floating bed was the weakest. The Cu2+final cumulative removal rates in the three kings of ecological floating bed accounted for87.21%,69.21%and59.82%.The Cu2+in sewage could produce inhibitory effect on removal of CODCrand TP of the ecological floating bed system.(2) The micro-aeration enhanced ecological floating bed was made up of Iris pseudacorus, Cyperus alternifolius and Iris sibirica. The micro-aeration enhanced ecological floating bed which was made up of Iris pseudacorus had the strongest ability to remove the Cu2+, followed by the Iris sibirica, the Cyperus alternifolius was the weakest.The roots of Iris pseudacorus, Cyperus alternifolius and Iris sibirica were the main parts of the enrichment of Cu2+. Only a small part of the Cu2+transferred to the stems and leaves of plants.(3) Different aeration rate of the micro-aeration enhanced ecological floating bed had different removal effect. The Cu2+final cumulative removal rates in the five kings of ecological floating bed was pecking order for7.5L/min,5L/min,2.5L/min, lOL/min and OL/min. The best aeration rate was7.5L/min. The excessive aeration inhibited micro-aeration enhanced ecological floating bed removing Cu2+in sewage, and inhibited the plants absorbing Cu2+.(4) The removal rates of Cu2+in the sewage of the ecological floating bed were the fastest and the most significant in the beginning three to five days.