Krisadee Promtavee และ Patiroop Pholchan. (2012) Effect of sludge ages on formaldehyde and phenol removal in plug-flow and cstr anaerobic membrane bioreactors. Chulalongkorn University:ม.ป.ท.Krisadee Promtavee และ Patiroop Pholchan. 2012. Effect of sludge ages on formaldehyde and phenol removal in plug-flow and cstr anaerobic membrane bioreactors. ม.ป.ท.:Chulalongkorn University;Krisadee Promtavee และ Patiroop Pholchan. Effect of sludge ages on formaldehyde and phenol removal in plug-flow and cstr anaerobic membrane bioreactors. ม.ป.ท.:Chulalongkorn University, 2012. Print.