Impact of the herbicide (RS)-MCPP on an anaerobic membrane bioreactor performance under different COD/nitrate ratios

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• 作者：Ali Yuzir^a ; ^{muhdaliyuzir@utm.my} ; Shreeshivadasan Chelliapan^b ; ^{shreeshivadasan@ic.utm.my} ; Paul J. Sallis^c ; ^{p.j.sallis@ncl.ac.uk}
• 关键词：Anaerobic membrane bioreactor ; Mecoprop ; Herbicide ; COD/nitrate ratios
• 刊名：Bioresource Technology
• 出版年：2012
• 期刊代码：11_09608524
• 类别：ce
• 出版时间：April, 2012
• 卷：109
• 期：Complete
• 页码：31-37
• 文件大小：509 K

摘要

The degradation of (RS)-MCPP was investigated in an anaerobic membrane bioreactor (AnMBR) using nitrate as an available electron acceptor under different COD/ ratios. Results showed high soluble COD removal efficiency (80-93%) when the reactor was operated at high COD/ ratios. However, the COD removal started to decline (average 15%) at high nitrate concentrations coinciding with a drop in nitrate removal efficiency to 37%, suggesting that the denitrification activity dropped and affected the AnMBR performance when nitrate was the predominant electron acceptor. Additionally, the removal efficiency of (RS)-MCPP increased from 2%to 47%with reducing COD/ ratios, whilst the (RS)-MCPP specific utilisation rate (SUR) was inversely proportional to the COD/ ratio, suggesting that a lower COD/ ratios had a positive influence on the (RS)-MCPP SUR. Although nitrate had a major impact on methane production rates, the methane composition was stable (approximately 80%) for COD/ ratios of 23 or more.