Factors affecting treatment of BTX waste-gas in bio-trickling filter

In order to investigate the factors affecting the bio-treatment of BTX (benzene, toluene and xylene) waste-gas, a continuous-flow experiment was conducted in a novel bio-trickling filter (BTF) with ZAT-2 type patent stuffing. The results showed that the gas concentration of influent, the up flow velocity of gas and the sprinkling liquid flow were three important factors affecting the removal of BTX waste-gas. In order to acquire maximal removal ability, the following three aspects of the operational conditions should be satisfied: the influent gas concentrations of benzene, toluene and xylene were 2.140 mg/L, 2.026 mg/L, 2.017 mg/L respectively; the up flow velocity was 78.6 m/h and the sprinkling liquid flow rate was 25 L/h at the temperature of 12-25°C and pH value of 6.3-6.9 in the reactor. Thus, the maximal removal ability of BTX waste-gas can go up to 1.36 kg/(m³·d) for benzene, 1.36 kg/(m³·d) for toluene and 1.24 kg/(m³·d) for xylene.