铬对生活污水中氮磷的植物净化效果及体内氮磷含量的影响  

Effects of chromium on the removal of nitrogen and phosphorus in domestic wastewater and the content of nitrogen and phosphorus in plants

作　　者：李志刚[1] 李素丽[1] 黄海连[1] 蒲琦[1] 陈竑 陈伟刚[3] 王振丰[4] 

机构地区：[1]广西大学农学院,广西南宁530005 [2]南宁市城市管理局,广西南宁530022 [3]南宁市环境保护局,广西南宁530022 [4]广西建设职业技术学院,广西南宁530005

出　　处：《生态环境学报》2010年第2期286-290,共5页Ecology and Environmental Sciences

基　　金：国家水体污染控制与治理科技重大专项(2008ZX07317-006);重点流域水污染的绿色生态修复技术研究与应用示范(桂科攻0719005-2-2B);小城镇简易高效低耗污水处理共性关键技术研究与应用示范(桂科攻0816002-4)

摘　　要：采用水培法,设置4个Cr6+质量浓度(0,1,10,20mg·L-1)处理风车草(Cyperus alternifolius)和薏米(Coix aquatica Roxb),以此研究铬对生活污水中氮磷净化效果及植物体内氮磷质量分数的影响。结果表明:(1)试验期内,铬质量浓度为1mg·L-1时促进风车草和薏米对总氮的去除,铬质量浓度为20mg·L-1时则抑制;总氮去除率因处理时间不同而不同,表现在处理17d时0mg·L-1、1mg·L-1铬处理显著高于处理7d,但20mg·L-1处理则相反;除Cr20处理外,薏米对总氮的去除率显著高于风车草。(2)风车草和薏米对生活污水中总磷的去除率随铬处理时间延长而降低,表现在处理17d时10mg·L-1、20mg·L-1铬处理显著低于处理7d;在20mg·L-1铬处理下皆显著低于对照;风车草对总磷的去除率在10mg·L-1、20mg·L-1铬处理下显著高于薏米。(3)不同质量浓度Cr6+处理下风车草和薏米体内氮、磷质量分数的变化不同,其中20mg·L-1铬处理下风车草茎和薏米根、茎及叶片皆显著低于对照。In order to study the effects of chromium on the removal of nitrogen and phosphorus in domestic wastewater and the content of nitrogen and phosphorus in plants,Cyperus alternifolius and Coix aquatica Roxb were cultured in domestic wastewater with four Cr6＋ concentrations（0,1,10,20 mg·L-1）.The results were as follow：（1） the removal of total nitrogen was promoted at 1 mg·L-1 Cr6＋ concentration,but inhibitted at 20 mg·L-1,and it was different with different treating time,the removal rate of 17 days was significantly higher than that of 7 days at 0 and 1 mg·L-1 Cr6＋concentrations,but lower at 20 mg·L-1;the removal rate of Coix aquatica Roxb was significantly higher than that of Cyperus alternifolius at all Cr6＋ concentrations except 20 mg·L-1.（2） The removal rates of Cyperus alternifolius and Coix aquatica Roxb on total phosphorus decreased with the prolonging of treating time,the removal rates of 10 and 20 mg·L-1 treatment were significantly lower after 17 days than that after 7 days;the removal rate of 20 mg·L-1 treatment was significantly lower than that of control;the removal rate of Cyperus alternifolius on total phosphorus was significantly higher than that of Coix aquatica Roxb at 10 and 20 mg·L-1.（3） The changes of nitrogen and phosphorus content in Cyperus alternifolius and Coix aquatica Roxb were different with different Cr6＋ concentrations,nitrogen and phosphorus contents of 20 mg·L-1 treatment were significantly lower than that of the control in the stems of Cyperus alternifolius and the roots,stems and leaves of Coix aquatica Roxb.

关 键 词：生活污水 氮 磷 Cr6+ 

分 类 号：X171.5[环境科学与工程—环境科学]