A Review on Water Eutropication: The Causing Factors and Purifying Technologies

Water eutrophication has become a worldwide environmental problem, and understanding the causing factors of water eutrophication will help for prevention and remediation of water eutrophication. The major causing factors of water eutrophication and purifying technologies were reviewed in this paper. There are many factors causing water eutrophication, including human activities, air deposition, precipitation, fertilizer runoff, animal waste and rural household pollution. Therefore, it is difficult to remediate eutrophic water. Constructed wetlands and floating beds have proven to be promising treatment alternatives in developing countries. Moreover, the biomass from phytoremediation ecological engineering can be used bioenergy feedstocks or animal feeds.