Effects of Eight Wetland Plants on Purification of Domestic Sewage
the experiment explore the removal effects on TN,NH3-N,NO3-N,BOD5,CODCr and TP in the domestic sewage in the autumn by eight wetland plants of Nelumbo nucifera,Iris laevigata,Iris sibirica,Thalia dealbata,Rhizoma calamus,Iris pseudacorus.Zizania aquatica and Pontederia cordata.The method of membership function in fuzzy mathematics was used to evaluate the effects of water purification comprehensively.The results showed that due to the low temperature in the autumn,plant absorption,bacterial nitrification and denitrification were weak,and the removal effect of wetland plants on NH3-N,NO3-N and TN were not ideal.The removal effect on CODCrby wetland plants was good and the difference was not obvious,and all of them reached more than 70％.Thalia dealbata,Rhizoma calamus and Iris pseudacorus showed the best removal effects.The removal rates of CODCr by the three were all 79.3％.The removal effects on BOD5 by wetland plants were good and about the same,all around 70％,among which Iris sibirica showed the best removal effect,and the removal rate of BOD5 was 74.1％.Wetland plants had the best removal effects on TP,all of which were above 80％.The removal rate of TP by Iris sibirica was as high as 92.4％.The comprehensive purification capacity of 8 wetland plants for domestic sewage was Nelumbo nucifera＞Zizania aquatic＞Rhizoma calamus＞Pontederia cordata＞Thalia dealbata＞Iris laevigata＞Iris sibirica＞Iris pseudacorus.
wetland plantpurified water qualitymembership function method
NETL
NSTL
万方数据
维普
