title: Impact of food to microorganism (F/M) ratio and colloidal chemical oxygen demand on nitrification performance of a full-scale membrane bioreactor treating thin film transistor liquid crystal display wastewater.
abstract: This study investigated impact of food to microorganism (F/M) ratio and colloidal chemical oxygen demand (COD) on nitrification performance in one full-scale membrane bioreactor (MBR) treating monoethanolamine (MEA)/dimethyl sulfoxide (DMSO)-containing thin film transistor liquid crystal display (TFT-LCD) wastewater. Poor nitrification was observed under high organic loading and high colloidal COD conditions, suggesting that high F/M ratio and colloidal COD situations should be avoided to minimize their negative impacts on nitrification. According to the nonmetric multidimensional scaling (NMS) statistical analyses on terminal restriction fragment length polymorphism (T-RFLP) results of ammonia monooxygenase (amoA) gene, the occurrence of Nitrosomonas oligotropha-like ammonia oxidizing bacteria (AOB) was positively related to successful nitrification in the MBR systems, while Nitrosomonas europaea-like AOB was positively linked to nitrification rate, which can be attributed to the high influent total nitrogen condition. Furthermore, Nitrobacter- and Nitrospira-like nitrite oxidizing bacteria (NOB) were both abundant in the MBR systems, but the continuously low nitrite environment is likely to promote the growth of Nitrospira-like NOB.
authors.affiliation: Department of Environmental Engineering, National Cheng Kung University, No. 1, University Road, Tainan 701, Taiwan.
authors.forename: Yi-Ju
authors.initials: YJ
authors.lastname: Wu
authors.forename: Liang-Ming
authors.initials: LM
authors.lastname: Whang
authors.forename: Ming-Yu
authors.initials: MY
authors.lastname: Chang
authors.forename: Toshikazu
authors.initials: T
authors.lastname: Fukushima
authors.forename: Ya-Chin
authors.initials: YC
authors.lastname: Lee
authors.forename: Sheng-Shung
authors.initials: SS
authors.lastname: Cheng
authors.forename: Shu-Fu
authors.initials: SF
authors.lastname: Hsu
authors.forename: Cheng-Huey
authors.initials: CH
authors.lastname: Chang
authors.forename: Wason
authors.initials: W
authors.lastname: Shen
authors.forename: Charn-Yi
authors.initials: CY
authors.lastname: Yang
authors.forename: Ryan
authors.initials: R
authors.lastname: Fu
authors.forename: Tsair-Yuan
authors.initials: TY
authors.lastname: Tsai
mesh_terms: D057919:Biological Oxygen Demand Analysis; D019149:Bioreactors; D003102:Colloids; D050866:Liquid Crystals; D058465:Nitrification; D009606:Nitrosomonas / Q000302:isolation & purification; D062065:Wastewater / Q000737:chemistry* / Q000382:microbiology; D018508:Water Purification / Q000379:methods*
chemical_list: D003102:Colloids; D062065:Wastewater