复合生物滤池处理H2S和NH3的挂膜与工艺条件

采用复合生物滤池(生物滴滤池 生物过滤池)处理H2S和NH3组成的混合恶臭气体,填料分别为经表面改性的天然斜发沸石和木屑.实验研究了该工艺的驯化挂膜情况和主要工艺条件,结果表明,天然斜发沸石和木屑改性后,驯化挂膜周期为10～14 d,比文献中颗粒活性炭挂膜缩短14～18 d.复合生物滤池的最佳工艺条件为:高度120 cm,循环液流量4.56 L/h.同时,生物滴滤池处理水溶性好的NH3气体效果较生物过滤池好,而生物过滤池处理水溶性差的H2S气体较生物滴滤池好.因此,复合生物滤池可用于处理不同水溶性的混合恶臭气体.

Study on packing biofilm and process conditions of hydrogen sulfide and ammonia removal by composite biofilter

The composite biofilter(a combination of biotrickling filter and biofilter),taking surfactant-modified clinoptilolite and wood chip as the media respectively,was applied to treat the mixed odors(H_2S and NH_3).The microbial acclimation and the process conditions were studied.The results indicated that the period of packing biofilm was 10~14 d with surfactant modification,which shortened 14~18 d,compared to the activated carbon used in literatures.The optimum height and recycle liquid rate of composite biofilter were 120 cm and 4.56 L/h,respectively.The biotrickling had better removal efficiency for hydrophilic NH_3 than biofilter,while the biofilter had better removal efficiency for hydrophobic H_2S than biotrickling filter.Therefore,the composite biofilter could be used to treat the mixed odors.