Degradation of phenol and 2,4,6-trichlorophenol by biofilm coupled UV irradiation

Chlorophenol is one of recalcitrant compounds,and existed in natural environment.Conventional biological is powerless for chlorophenol to be degraded effectively,and biodegradation of phenol could be also inhibited due to its existence at the same time.Therefore,an internal loop photo-biodegradation reactor(ILPBR) was accepted for degradation of the mix solution of phenol and 2,4,6-trichlorophenol(2,4,6-TCP) by means of biofilm coupled UV irradiation with 254nm wavelength.Regularity of phenol and 2,4,6-TCP degradation was respectively discussed and compared with three protocols,photolysis by ultraviolet alone(P),biodegradation by biofilm alone(B),and intimately coupled photolysis and biodegradation(P+B),especially for the effect of 2,4,6-TCP on the rate of phenol degradation.Experimental results indicated that phenol degradation rate was inhibited due to the presence of 2,4,6-TCP,but little effect of phenol on degradation of 2,4,6-TCP.P+B were the quickest among three protocols for both phenol and 2,4,6-TCP removal rates,and corresponding COD removal percentage was also the highest.