Simulation Study On The Removal And Accumulation Of Cu²⁺ In High Concentration Surface Water Through Emerged Plant Ecological Floating Bed

There were still a lot of smelting, electroplating, mining and other industrial wastewaters casual or not standard discharged into the natural water environment in China, causing rivers and lakes with varying degrees of heavy metal pollution. Aquatic ecological restoration technology is a time- saving, small secondary environmental pollution, good sustainable technology, emergent plants ecological floating bed is not only to achieve the removal of Cu²⁺ in water, but also beauty the environment, this technology has good prospects and the practical application of high theoretical research value.In this paper, it was simulated that emergent plants ecological floating bed removed and accumulated Cu²⁺, mainly studied Cu²⁺ removed in different concentrations, different p H and different plants amount, and analyzed the distribution and accumulation of Cu²⁺ in plant, which offered a theoretical basis for practical engineering screening plants, and provided technical support and theoretical basis for the practical application of ecological floating bed. The major findings could be summarized as following:?1? Canna indica, Cyperus alternifolius and Brazilian milfoil have a certain tolerance for Cu²⁺, and can enrich a certain amount of Cu²⁺, showed good effects for removing Cu²⁺.?2? The best time of Canna indica, Cyperus alternifolius and Brazilian milfoil removed Cu²⁺ were: 13 days, 15 days and 13 days, the final removal rates were 31.2%, 26.5% and 26.4%. On a single emergent plants removed Cu²⁺, the canna indica is the best choice, followed by the Cyperus alternifolius.?3? Different p H environment will affect enrichment capacity of plants to Cu²⁺, the acidic environment conducived to absorb and accumulate for Cu²⁺, but also conducived to transfer Cu²⁺ from plant roots to stems and leaves, and grow. The order that plants enriched Cu²⁺ is: p H = 5 > p H = 7 > p H= 9 in Canna indica, p H = 7 > p H = 5 > p H = 9 in C yperus alternifolius, p H = 5 > p H = 9 > p H = 7 in Brazilian milfoil. From the transfer coefficient, the C yperus alternifolius favored to Canna indica, Brazilian milfoil roots are short and small, the vast majority of Cu²⁺ will accumulated in the stems and leaves.?4? Different phytomasses will affect enrichment capacity of plants to Cu²⁺, in this experiment, the removal rates of the group of Canna indica two?three plants?, Cyperus alternifolius three?twenty four plants? and Brazilian milfoil three?seventy plants? were highest, reaching 39.7%, 32.2% and 31.1%, respectively. Enriching Cu²⁺ capability is also different in the amount of different plants: group two > group three > group four > group one in Canna indica, group three > group four > group two > group one in Cyperus alternifolius, group three > group two > group four > group one in Brazilian milfoil. From transfer coefficient, the C yperus alternifolius favored to Canna indica, in Canna indica group, group two > group one > group four > group three; in Cyperus alternifolius group, group three > group one > group four > group two; Brazilian milfoil roots are short and small, the vast majority of Cu²⁺ will accumulated in the stems and leaves.?5? The Cu²⁺removal rate in Canna indica+Cyperus alternifolius+Brazilian milfoil ecological floating bed was 29.1%; The Cu²⁺ removal rate in Canna indica+Cyperus alternifolius ecological floating bed was 20.2%; The Cu²⁺ removal rate in Canna indica +Brazilian milfoil ecological floating bed was 18.9%; The Cu²⁺removal rate in Cyperus alternifolius+Brazilian milfoil ecological floating bed was 16.2%. From the removing Cu²⁺ effects of each the ecological floating bed view, Canna indica+Cyperus alternifolius+Brazilian milfoil floating bed > Canna indica+C yperus alternifolius floating bed > Canna indica +Brazilian milfoil floating bed > Cyperus alternifolius+Brazilian milfoil floating bed.?6? The four combined ecological floating bed have some accumulated capability for Cu²⁺, the pecking order of accumulated capability was Canna indica+Cyperus alternifolius+Brazilian milfoil ecological floating bed> Canna indica+Cyperus alternifolius ecological floating bed> Cyperus alternifolius+Brazilian milfoil ecological floating bed> Canna indica +Brazilian milfoil ecological floating bed. In view of plant species in each floating bed, the Cu²⁺ contents of roots in Canna indica and Cyperus alternifolius exceeded stem and leaves, Brazilian milfoil roots are short and small, the vast majority of Cu²⁺ will accumulated in the stems and leaves, it can be propitious to recycling Cu²⁺. From enrichment factors and transfer coefficients, the Canna indica is propitious to enriching Cu²⁺; the transfer coefficient of Cyperus alternifolius is larger, it can be transferred Cu²⁺ faster from root to leaf.