生物转鼓净化SO2的性能研究

Experimental Study on SO2 Purification Performance in a Rotating Drum Biofiter

采用生物转鼓为反应器,通过活性污泥驯化挂膜,考察在不同的工艺条件下SO_(2)的去除性能和转化途径。实验结果表明,生物转鼓反应器启动快速,去除效果稳定,生物转鼓在25天内挂膜成功,最大SO^(2-)_(4)去除负荷为45mg/(L·h)。在稳定运行期间,转速4 r/min、液相体积17L、温度28℃、pH 7、气体流量为4 L/min、进气浓度为300~900mg/m^(3)时,SO_(2)去除率维持在95.5%~96.5%。SO_(2)去除率随着进气浓度的升高而降低,当进气浓度为328 mg/m^(3)时,SO_(2)去除率为97.5%,受去除负荷限制,当进气浓度达到2850 mg/m^(3)时,SO_(2)去除率降到了90%。液相中的S含量变化值与被微生物所净化的S含量之和与气相中的S含量变化值基本一致,SO_(2)在生物转鼓内的转化过程中S元素是平衡的。与其他生物废气处理工艺相比,生物转鼓在去除负荷、净化高浓度含硫废气等方面有更好的表现,是一种具有很好发展前景的生物脱硫工艺。

The removal performance and transformation pathway of SO_(2) under different processes conditions were investigated by a rotating drum biofiter(RDB)with membrane formation by acclimation of activated sludge.The experimental results showed that the RDB started quickly and the removal effect was stable.The biofilm was successfully formed in 25 days,and the maximum SO^(2-)_(4)-removal load was 45 mg/(L·h).During the stable operation,the SO_(2) removal efficiency maintained at 95.5%~96.5%when the rotation speed was 4r/min,the liquid volume was 17L,the temperature was 28℃,the pH was 7,the gas flow rate was 4 L/min,and the inlet concentration was 300〜900 mg/m^(3).The SO_(2) removal efficiency decreased with the increase of inlet concentration.The SO_(2) removal efficiency was 97.5%when the inlet concentration was 328 mg/m^(3).Restricted by the removal load,the SO_(2) removal efficiency decreased to 90% when the inlet concentration reached 2850 mg/m^(3).The sum of the change value of S content in the liquid phase and the S content purified by microorganisms was basically the same as the change value of S content in the gas phase,so the S element balanced during the transformation of SO_(2) in the RDB.Compared with other biological processes,RDB has better performance in load removal and purification of high concentration sulfur-containing waste gas,so it is a biological desulfurization process with good development prospects.