| Recently, water environment and eutrophication are getting deterioration which has been restricting the development of our economy. So it is significance to study the eutrophication of water and protect water environment. This paper is an important part of the 863 plan --"environment pollution control technology in the field of resource and environment technology". Aiming at the eutrophication water of the Taihu lake area, this paper study the packing medium in the constructed wetland in the work of the prepositive reservoir, the characteristic of cinder in the packing medium of the constructed wetland and its adsorption about the nitrogen and phosphor in the sewage.1 , The result of the study about the characteristic of cinder shows that cinder contains many elements that include calcium, magnesium , aluminium, zinc, iron and the etc and that cinder is a kind of material with lots of hole. It is feasible that we regard cinder as a constructed wetland padding to remove the organism in sewage through the study in this paper. It is a new field that cinder adsorption and treating technology is applied in the control technology of non—point pollution. And the study increase the field of selection for constructed wetland packing medium.2, The result of the static and dynamic experiment about the cinder removing nitrogen and phosphorus show that the effect of the adsorption of the cinder in water is influenced by cations, hydraulic retention time(HRT), cinder size, quantity, boundary condition and the etc. The paper also indicates that the using of properly decreased HRT and the small cinder in size is better for removing the nitrogen and phosphorus. This study provides technology for the rational and scientific running of the engineering.
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