کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4964 | 264 | 2006 | 7 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Biodegradation of 4-CP and 2,4-DCP mixture in a rotating biological contactor (RBC) Biodegradation of 4-CP and 2,4-DCP mixture in a rotating biological contactor (RBC)](/preview/png/4964.png)
In this study, the performance of a two stage rotating biological contactor (RBC) was evaluated for the treatment of synthetic wastewater containing peptone, 4-chlorophenol (4-CP) and 2,4-dichlorophenol (2,4-DCP) at 5 rpm. Also, the effect of biogenic substrate (peptone) concentration on the reactor performance was investigated. High chlorophenols (>98%) and COD (>94%) removals were achieved throughout the reactor operation in the first stage and the second stage behaved as a polishing step. The observed maximum 4-CP and 2,4-DCP removal rates in the first stage were 2305 mg/L day (18.3 g/m2 day) and 1202 mg/L day (9.5 g/m2 day), respectively. Deacclimation of biomass was carried out for 3.5 months after 260 days of operation with the reactor feed turning on to contain peptone only. Upon addition of 4-CP (200 mg/L) and 2,4-DCP (100 mg/L), a rapid reacclimation of biomass was observed within 16 days. Shock loading experiments with 4-CP (822.7 ± 1.4) and 2,4-DCP (424.6 ± 1.9 mg/L) resulted in around four times higher effluent 4-CP concentrations than 2,4-DCP in both stages, which may be due to strong competitive inhibition of 2,4-DCP on 4-CP degradation.
Journal: Biochemical Engineering Journal - Volume 31, Issue 2, 1 September 2006, Pages 141–147