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Inhibitory effect of 2,4-dichlorophenol on nitrogen removal in a sequencing batch reactor
Jun-Wei Lim,Si-Ling Ng,Siok-Moi Khor,Chye-Eng Seng 한국화학공학회 2012 Korean Journal of Chemical Engineering Vol.29 No.7
We examined the inhibitory effect of 2,4-dichlorophenol (2,4-DCP) on nitrogen removal in the sequencing batch reactor (SBR) system. The reactor was operated with FILL, REACT (nitrification: denitrification), SETTLE,DRAW and IDLE phases in the duration ratio of 2 : 12 (9 : 3) : 1 : 1 : 8 for a 24 h cycle time. The deterioration of 2,4-DCP removal efficiency from 100 to 41% was observed when the influent concentration of 2,4-DCP was increased to 30mg/L. The residual 2,4-DCP remaining in the mixed liquor was found to inhibit the nitrification process, resulting in the decrease of nitrogen removal efficiency to 25 %. For kinetic study, the result showed that the experimental data of ammoniacal nitrogen (AN) removal at every stage fitted well to the first-order kinetics equation with high R2 values. The rate constant of AN removal, kAN, decreased with increasing influent concentration of 2,4-DCP, from 0.053 to 0.0006/min when 2,4-DCP concentration increased from 0 to 30 mg/L, respectively. However, the observed gradual recovering of AN removal with respect to the removal efficiency and kinetics during the recovery stage indicated that the inhibitory effect of 2,4-DCP on the nitrification process was reversible.
Chae, Jung-Woo,Chua, Peh Siang,Ng, Terence,Yeo, Angie Hui Ling,Shwe, Maung,Gan, Yan Xiang,Dorajoo, Sreemanee,Foo, Koon Mian,Loh, Kiley Wei-Jen,Koo, Si-Lin,Chay, Wen Yee,Tan, Tira Jing Ying,Beh, Sok Yu Springer-Verlag 2018 Breast cancer research and treatment Vol.168 No.3
<P>This is the first study to show that the reduction of mtDNA content in peripheral blood is associated with the onset of CRF in patients receiving chemotherapy. Further validation studies are required to confirm the findings.</P>