Advantages of combined UV photodegradation and biofiltration processes to treat gaseous chlorobenzene

摘要: Abstract A combined ultraviolet photodegradation and biofiltration (UV-BF) process was developed to treat gaseous chlorobenzene. The performance of this evaluated under various operating conditions, including different inlet concentrations, residence times, transient loadings, compared with a control (BF) process. Furthermore, the acute biotoxicities products, bioaerosol emissions from biofilters, biomass accumulation pressure drop in biofilters were investigated. experimental results showed that UV-BF provided higher removal efficiencies than those BF over an concentration range 250–1500 mg m−3 for times 41–122 s inside 24–81 s UV reactor. After pretreatment, rates subsequent biofilter increased linearly loading, even beyond 50 g m−3 h−1. Similar loading resulted gradual decline due substrate inhibition effect. These suggested pretreatment reduced inhibitory effects chlorobenzene on microorganisms biofilters. Transient conditions tested by increasing 1000 2500 mg m−3 or shifting gas flow rate 0.1 0.3 m3 h−1, which led outlet concentrations standalone can produce products significant biotoxicity. Acute as high 12 mg-Zn2+ L−1 measured. Biotoxicity levels less 5 mg-Zn2+ L−1 after biofilter. Ozone, by-product produced during process, contributed reduction emission helped biomass, thus slowing down increase