Plants Selection for Domestic Sewage Treatment in Jilin City

Abstract

This experiment studied the removal efficiency of domestic sewage by testing 19 species of wetland plants along the Songhua River in Jilin City. It is shown that plants can purify domestic sewage, and the ability of removal efficiency is varied on different species. Rumex patientia var.callosus is the best in removal efficiency of TN(29.14%);Coleus blumei Benth. could effectively reduce output of TP and COD,the best removal efficiencies for TP is 58.04%, COD is 95.18%; Oenanthe javanica(Blume) DC. has better efficiency to increase DO in´sewage, and the maximum increase is 262.22%;Rumex.patientia var.callosus,Alisma orientale(Sam.)Juz.,Oenanthe javanica(Blume) DC.,Erigeron annuus (L. ) Pers. may be used as plants for the construction of sewage treatment landscape, because these plants have better comprehensive capacity for domestic sewage treatment. Water pollution has become a general and worldwide problem today. The application of wetland plants for waste water treatment features low cost,easiness to manage, high efficiency and etc.(Han Xiaoyuan etc.,2005;Li linfeng etc.,2006;Zhang Honggang,Hong Jianming,2006).Wetland plants can not only absorb nitrogen and phosphorus directly but also remove the heavy metals and organics in the waste water. (Xu Weiwei etc.,2005;Cheng Wei etc.,2005;C.C.Tanner,2001;Tang Shirong,2006;SAMAKEMoussa,2003;L.K.Mitchell,A.D Karathanasis,1995).According to current research reports,Phragmitas communis Trin, Juncus effuses Linn, Rush, and Iris japonica Thunb, Buttery Swordflag can efficiently remove nitrogen and phosphorus from the sewage (Deng Futang etc.,2005;Yuan Donghai etc.,2004;A. Fey,G. Benckiser,J.C.G. Ottow,1999).The constructed wetlands consisting of varied plants,such as Phragmitas communis Trin,Canna indica Linn. or Acorus gramineus Soland,Grassleaved Sweetflag,are effective in eliminating chemical oxygen demand(“COD”) in the waste water(Zhao Jiangang etc.,2006;Zhong Yushu etc.,2006;Yuan Donghai etc.,2004).Therefore wetlands can be used to reduce water pollution(Weng Meiya etc.,2005;Liu Zilian etc.,2005;Robert M. Seams,1995).So far most current studies have been developed in the South China with few in the Northeast area of China. 19 kinds of wetland plants growing along the Songhua River is selected in Jinlin City. We analyze and decide which plants are suitable for plant landscape application due to their better urban sewage treatment functions.