Removal properties of Nitrogen and Phosphorous in Eutrophic water with Periphyton Attached by Artificial Substrate

摘要

Removal properties are researched and discussed of algae and nitrogen & phosphorus nutrients with periphyton by assembled substrate in lake-based eutrophic water body, including impacts on removal effects of several physical & chemical properties as water depth, water velocity, DO, temperature and PH. The results show that: the removal rate of NH_4-N, other nitrogen nutrients, phosphorus nutrients and Chl-a were 96%, 40%, 80%, 65% respectively. With the growth of water velocity (from 0 to 200L/h), the removal of Chl-a, TP, TDP increased to a certain extent (Chl-a: from 63.63% to 67.66%; TP:from 76.15% to 85.13%;TDP:from 80.10% to 88.44%), and that of TN,TDN and NO_3-N decreased to different extents (TN: from 45.19% to 31.97%; TDN: from 42.81% to 28.77%; NO_3-N: from 38.11% to -5.26%), but that of NH_4-N and PO_4-P altered little (NH_4-N: from 96.80% to 95.94%; PO_4-P : from 85.38% to 87.02%). It will provide reference for recovery and re-contribution of destroyed Eco-system, and a new thought for treatment in eutrophical lakes.