水培空心菜系统与水培莴笋系统去除污水中氮磷效果比较

摘要

With the effluent from the secondary biochemical treatment unit of domestic sewage taken as the research object,the removal efficiency of TN and TP was studied through the self-made hydroponic mater convolvulus purification system and the self-made hydroponic asparagus lettuce purification system.The results show that when the influent flow rate was 13.5 L / h,HRT was 1 h and influent was uninterrupted.The removal rates of TN by the hydroponic mater convolvulus purification system and the hydroponic asparagus lettuce purification system were 11.2％-62.4％ and 27.8％-56.2％ respectively,and the removal rates of TP were 7.1％-71.8％ and 0％-63.3％ respectively;the daily removal volumes of TN range from 832 mg to 3 411 mg and from 349 mg to 5 368 mg respectively,and the daily removal volumes of TP range from 9.7 mg to 372.8 mg and from 0 mg to 281.9 mg respectively.In the autumn and winter,the hydroponic asparagus lettuce system has better removal efficiency of TN than that of the hydroponic mater convolvulus system,and the system is of more stable removal effect for TN and TP.%采用自制的两套水培植物净化床装置,以生活污水二级生化处理装置出水为研究对象,探讨了水培空心菜净化系统和水培莴笋净化系统对污水中TN,TP的去除效果.结果表明,当进水流速控制在13.5 L/h,HRT为1h,装置连续进水运行时,在水培期间,水培空心菜系统和水培莴笋系统对污水中TN的去除率分别为11.2％ ～62.4％和27.8％ ～56.2％,对TP的去除率分别为7.1％ ～71.8％和0％～63.3％;水培空心菜系统和水培莴笋系统对TN的每日净去除量范围分别为832 ～3 411 mg和349 ～5 368 mg,对TP的每日净去除量范围分别为9.7 ～372.8 mg和0～281.9 mg.在秋冬季节,水培莴笋系统较水培空心菜系统对TN有更好的去除效果,且对TN,TP去除效果更为稳定.