EFFECT OF AQUATIC PLANTS COMBINED WITH COMPOUND MICROORGANISM PREPARATIONS CONTROL ON EUTROPHICATION IN RECLAIMED WATER

摘要

Reclaimed water contains large amounts of nutrients (N, P, etc.), which make reclaimed water reuse district face certain pollution risks. Aquatic plants combining compound microorganism preparations can be a practical method to purify in situ reclaimed water. Based on this approach, Typha angustifolia (emergent plant) and Myriophyllum verticillatum (submerged plant), as well as Nitrogen-Cycle Bacteria (compound microorganism preparation) were chosen to test the N, P purification effects in reclaimed water by simulated field experiments. The results showed that: TN removal efficiency in emergent plant configurations was above 60%, and the best configuration was Typha angustifolia (20 strains/barrel) combined with Nitrogen-Cycle Bacteria (8 g/m(3)) (TA+NB_High, TN removal efficiency was 88.2%). The average removal rate of TN in Myriophyllum verticillatum combined with Nitrogen-Cycle Bacteria treatment (MS+NB_Low) was 25%, TP removal rate was about 76%, and BOD5 removal rate was about 45%. In emergent aquatic plants combined with Nitrogen-Cycle Bacteria treatments, the adsorbed and utilised nitrogen by aquatic plants was from flux transfoanation among overlying water, interstitial water and sediment, which reached higher removal effect in 30-90 days, the recommend harvest frequency for emergent plants is one test cycle (30 days).