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Removal of nitrogen from wastewater with perennial ryegrass/artificial aquatic mats biofilm combined system

查看全文 作　　者：Chongjun [1,2]Chen;Rui [1]Zhang;Liang [1]Wang;Weixiang [2,3]Wu;Yingxu [1]Chen 高影响力作者 机构地区：[1]The Academy of Water Science and Environmental Engineering,Zhejiang University;[2]Institute of Environmental Science and Technology,Zhejiang University;[3]Zhejiang Provincial Key Laboratory for Water Pollution Control and Environmental Safety高影响力机构 出　　处：《Journal of Environmental Sciences》索引2013年第25卷第4期,共7页高影响力期刊 基　　金：supported by the China National Critical Project for Science and Technology on Water Pollution Prevention and Control (No. 2008ZX07101-006) 摘　　要：To develop a cost-effective combined phytoremediation and biological process,a combined perennial ryegrass/artificial aquatic mat biofilm reactor was used to treat synthetic wastewater.Influent ammonium loading,reflux ratio,hydraulic retention time(HRT) and temperature all had significant effects on the treatment efficiency.The results indicated that the effluent concentration of ammonium increased with increasing influent ammonium loading.The reactor temperature played an important role in the nitrification process.The ammonium removal efficiency significantly decreased from 80% to 30%-50% when the reactor temperature dropped to below 10°C.In addition,the optimal nitrogen removal condition was a reflux ratio of 2.The nitrate and ammonium concentration of the effluent were consistent with the HRT of the combined system.The chemical oxygen demand(COD) removal efficiency was at a high level during the whole experiment,being almost 80% after the start-up,and then mostly above 90%.The direct uptake of N by the perennial ryegrass accounted for 18.17% of the total N removal by the whole system.The perennial ryegrass absorption was a significant contributor to nitrogen removal in the combined system.The result illustrated that the combined perennial ryegrass/artificial aquatic mat biofilm reactor demonstrated good performance in ammonium,total N and COD removal. 关 键 词：NITROGEN perennial ryegrass BIOFILM wastewater treatment
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