Abstract
To explore the effect of heterotrophic nitrification-aerobic denitrification mixed strains on urea removal, the removal characteristics of urea and effects of heavy metals and salinity on urea removal by mixed strains (DM01+YH01+YH02) were investigated. The results showed that urea could be efficiently degraded by mixed strains at 24 h in 200.0 mg·L-1 urea wastewater when the carbon source was sodium citrate, C/N was 10, temperature was 30℃, pH was 7, and rotation speed was 130 r·min-1. Heavy metal ions (Ni2+, Cd2+, Cu2+, and Zn2+) can reduce the removal efficiency of urea by mixed strains, and the degree of influence was Cd2+ > Cu2+ > Ni2+ > Zn2+. Fe2+ (<20.0 mg·L-1) in urea wastewater can enhance the removal efficiency of urea by mixed strains. Furthermore, a salinity of more than 10.0 mg·L-1 in urea wastewater can reduce the removal efficiency of urea by mixed strains.
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