Abstract
Eco-river channel building is an effective remediation technology for water body. Selecting appropriate matrix material to build eco-river channel can improve its purification capacity on the pollutants. In this paper, we conducted a comparative study on the adsorption capacity of gravel, sand and zeolite on nitrogen and phosphorus and made an initial analysis on its adsorption mechanism. The results show that, Freundlich isotherm equation can better describe the adsorption properties of those three materials, shown as follows: zeolite>gravel> sand. Thus, we should select gravel or zeolite with greater adsorption ability as matrix material to build eco-river channel, for it will not cause secondary pollution for water environment.
Highlights
In China, most of the lakes and rivers are in the eutrophic state
The matrix of surface flow wetlands and the eco-materials in eco-river have something in common, so domestic researches on the adsorption properties of constructed wetland matrix on nitrogen and phosphorus are instructive for the selection of appropriate ecological materials to build the ecological river channel (Gopal, 1999)
The results show that zeolite is an artificial wetland matrix which can better remove phosphorus, due to its good permeability as well as the widely distributed feature, etc; sand is often regarded as the matrix of constructed wetland
Summary
In China, most of the lakes and rivers are in the eutrophic state. In general cases, the concentration of total phosphorus and inorganic nitrogen respectively up to 0.02 mg/L and 0.3 mg/L of water indicates that this river has been in eutrophic state. The experimental method of the isothermal adsorption capacity of 3 eco-river matrixes on nitrogen and phosphorus: Respectively weigh gravel, sand and zeolite of 1 g (ground through 100 mesh sieve) and place it in 50 mL centrifuge tube, adding 30 mL ammonium sulfate with different concentrations.
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