Study On The Artificial Floating Island Remediation Technology In Eutrophic Water Bodies Of Hubei Rural Area

Eutrophication is the hypertrophic state of aquatic ecosystem owing to lots of pollutants in-put from outer resources and nutriments released from the bottom sediments, which becomes the main aquatic environmental problem all over the world and key factors restrict human society and economy developing. In rural areas of Hubei Province, eutrophic water has become the main problem, and has brought big threat to the safety of water consumption. The pollution discharged from rural area not only pollute local environment, but also has become a main source of pollution of all the province, and the amount has being higher than that from industrial of the whole province. So, to carry out some researchment about this is with much academic and practical significance.Eutrophic water in rural area is much dispersed, complex and has extensive sources. Because of this, the collect the wasted water is impossible. As for the economic factors, it is not feasible to adopt some expensive water treatment method. AFI(artificial floating island) is a method that with these features: low input, low operating cost, no secondary pollution and alterable scale. So it is very suitable to treat the eutrophic water in rural arear.This paper has made a study on artificial floating island remediation technology in eutrophic water of rural areas, carry out both indoor experiment and outdoor experiment. And adopt anaerobic reactor to treat the straw that creat by the plants.Firstly carry out the indoor experiment. Screening of eighteen kinds of plants and choose out eight kinds that can survival and grow very well on the artificial floating island. These plants are canna, water spinach, Philodendron selloum, cattail, leaf beet, rape, rice, reed. These plants is suitable to grow on the floating island. Secondly, choose out three kinds of plants , leaf beet, Philodendron selloum, rape. These kinds of plants are never mentioned as floating island types. Blende three nutrients degree with low, middle and heavy respectively, find out that all the plants can grow very well, and the higher of the nutrients degree, the better of treatment effect. Thirdly, we find out two types of adsorption material to assisted the plants grow when the Concentration of Nutrients in water is not enough, also achieved good results.When carry out the outdoor experiment, choose an serious eutrophic pool, its area is about one thousand square meter. Choose canna, water spinach, Philodendron selloum, cattail, leaf beet, rape and reed to grow on the island. All of the seven kinds of plants occupy one fifth of the whole pool area. One year later, in the situation of non sewage interception, the water quality is greatly improved, and water spinach can make some income, also. Find out that rape, water spinach, cattail, reed, canna are grow more better than others, so test the nitrogen and phosphorus content of the plant straw, to inverse estimation the treatment capacity. After calculation, each square meter rape, water spinach, cattail, reed, canna can respectively treat 35cubic metre, 109cubic metre, 44 cubic metre, 177cubic metre, 37cubic metre waste water.