Download citation:
BibTeX | RIS | EndNote | Medlars | ProCite | Reference Manager | RefWorks
Send citation to:

---

Abstract Introduction: 2, 4, 6 trichlorophenol (TCP) is one of the most toxic Chlorophenols and is very difficult to biodegradation. Advanced oxidation processes (AOPs) are the most effective processes for the degradation of persistent compounds, since the mineralization of recalcitrant compound by AOPs often requires long reaction time and strong dose of oxidant, the combination of this process with biological one considered as one efficient and economic method. Objective: Integration of Fenton oxidation with activated sludge as an efficient and economic method for removal of 2, 4, 6 trichlorophenol and on kinetics of activated sludge in this integrated system was studied. Materials and Methods: This study performed in pilot scale of Fenton oxidation / Activated sludge Integration for treatment of 2-4-6 TCP wastewater and all analytical methods were according to 19Th edition of standard methods. Results: The study results showed that intermediates in effluent from Fenton reactor [H2O2] /[Fe2+] =3 , [H2O2] / [TCP] =3 Oxidation Time = 1hr and pH= 3 [TCP] 0 = 120 mg/ equal COD=150 mg/L), was degraded by activated sludge process and COD reduction was ~%75. Increasing aeration time from 6 hr to 18 hr has no significant effect on removal efficiency (α =0.01). ML VSS increasing from 200 mg/L to 800 mg/L after 21 days indicated that TCP concentration in Fenton reactor effluent didn’t have inhibitory effect on microbial growth. Increasing of TCP concentration from 120mg/L to 240mg/L has no significant effect on removal efficiency, however removal efficiency decreases to %71. Activated sludge kinetics were studied and y= 0.66 mg/mg Kd =0.088 day-1 Ks = 109 mg/ L, K = 2.04 day-1 determined. Conclusion: As results this integrated system was an efficient method for removal of 2,4, 6TCP and result from increasing aeration time and TCP concentration, as sole substrate source for Activated sludge combined with Fenton oxidation was not adopted with Monod equation.

Keywords: Chlorophenols, Kinetics, Oxidation, Sewage

Full-Text [PDF 164 kb]   (2608 Downloads)    

Add your comments about this article : Your username or Email:

---