生物法净化含NH_3、H_2S和三甲胺的水产饲料恶臭废气的研究

以水产饲料恶臭废气中的主要组分H2S、NH3和三甲胺为研究对象,采用生物填料塔进行脱臭的试验研究,考察运行生物填料塔的主要影响因素及污染物净化处理效果。结果表明:塔内生物菌落对目标污染物具有较强的降解能力,且气体流量、进气浓度和液体喷淋量对恶臭净化效率的影响较小。在进气浓度≯300mg/m3、气体流量不高于0.45m3/h(停留时间≮20s)、循环液喷淋密度在0.05~0.9m3/(m2.h)时,系统对H2S、NH3和三甲胺的净化效率分别保持在100%、99.2%和99.4%左右。经扫描电镜分析可知,净化水产饲料恶臭废气的主要微生物为副球菌属和硫杆菌属中的细菌。

THE STUDY ON BIOPURIFICATION OF NH3,H2S AND TRIMETHYLAMINE-CONTAINING ODOR FROM AQUATIC FEED

It was selected the major components of the odor from aquatic feed factory,and hydrogen sulfide,ammonia and trimethylamine were taken as the target pollutants.Biological packed column was used for treating these pollutants.The research aimed at understanding the parameters affecting bioreactor performance.The results were as follows:the biotic community in the packed column had a good ability to degrade the target pollutants and the inlet concentration,gas flux and spray streams capacity had a little effect on the odor removal efficiency.When the inlet concentration was no more than 300 mg/m3,the gas flow was no more than 0.45 m3/g (the residence time was no less than 20 s) and the recycled liquid density was 0.05～0.9 m3/(m 2 ·h),hydrogen sulfide,ammonia and trimethylamine removal efficiency was about 100%,99.2% and 99.4% separately.The results of analysis by scanning electron microscope show that Paracoccus and Thiobacillus are the dominant bacteria during the purification.