Treatment of Hydrogen Sulfide Emission from Wastewater Treatment Plant by Using Bio-trickling Filter under Low Temperature Condition

摘要

In order to check the removal efficiency of hydrogen sulfide (H_2S) from pharmaceutical wastewater treatment plant with SBR (Sequencing Batch Reactor) process and adaptation of the bio-trickling filter to low temperature, deodorization experiment of odor containing H_2S from pharmaceutical factory was carried out continuously for four months in cold seasons by using the bio-trickling filter packed with ZX01 stuffing. The results suggested that removal efficiency of H_2S was higher than 99% when inlet volumetric loading of the bio-trickling filter was 153 g/(m~3·h) and the corresponding inlet concentration achieved 1275 mg/m~3 and the optimal retention time is 30s. When effluent wastewater from secondary sedimentation tank was used as spray water that contained a small quantity of N (nitrogen), P (phosphorus) and other elements, the optimum spray water flow rates were 5.3, 7.5 and 9.5 L/h when inlet concentrations were 240, 450 and 1000 mg/m~3 respectively. The bio-trickling filter had strong ability to resist shock of high volumetric loading, and was not blocked during experiments for nearly four months. Therefore, the bio-trickling filter need not carry out a back washing frequently, and it can be operated steadily for long-term.