Allocation,circulation and purification effect of nutrient pollutant N in synthetic wastewater in Avicennia marina simulated wetland system

Abstract

Abstract: By setting-up simulated mangrove wetland in a greenhouse,the behavior of total nitrogen in Avicennia marina simulated wetland system was studied.Three different concentrations of synthetic wastewater,namely C₁,C₅ and C₁₀ and artificial seawater (control) of 1.5% salinity were discharged into the wetland in fixed quantity twice a week for a year.C₁ had the characteristics similar to normal municipal sewage and C₅ and C₁₀ were five and ten times of nutrients and heavy metals as that in C₁ respectively.The results indicated that sewage irrigation could increase the content of nitrogen in tidal water and soil.The order of nitrogen content in plant was leaf>stem>root.The circulation period of nitrogen up-taken by plants was about 5 years.The simulated wetland system had significant purifying effect on nitrogen in synthetic wastewater.

Key words: SO₂, Wheat, Salicylic acid, Ethylene, Hydrogen peroxide

CLC Number:

Q948.12

CHEN Guikui, CHEN Guizhu. Allocation,circulation and purification effect of nutrient pollutant N in synthetic wastewater in Avicennia marina simulated wetland system[J]. cje, 2004, (6): 15-18.

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