一种包埋微生物复合填料的制备及性能评价

采用包埋法制备出一种复合生物填料，测其各项理化性质，并以NO。模拟废气验证其脱硝性能。填料主要由碳酸钙、牛粪堆肥腐殖质、菌剂载体、水泥、轻质珍珠岩、立体网状纤维及脱硝功能微生物等复合而成，粒径书12mm×20mm，自然堆积密度（471±0．8）kg／m2，持水量（49±1．3）％，比表面积3．91m2／g，平均机械强度（427．3±0．2）N，pH为10．5-0．2。填料能长期在潮湿环境中保持良好的粘结强度，并具有营养缓释及pH缓冲能力。包埋脱硝功能微生物复合填料中初期微生物数量5．3×10^5 CFU／g，运行60d后微生物数量达到8．6×10 8 CFU／g，闲置停运30d微生物有所减少，但重启后净化效率基本不变。当进气负荷低于I878mg／（13m3·h），气体停留时间为14．47s时，BF，的去除率高达93．15％。

Preparation and performance evaluation of a composite filler embedding microorganisms

A novel biological filler was prepared by embedding method. The physicochemical properties and performances in a pilot-scale biofilter on treating NOx waste gas were investigated. The filler was composited with CaCO3 ,compost humus,carrier for microorganisms,light pearlite,cement and reticular fibre. The composite granule prepared was a porous granule （Φ12 mm×20 mm） with a bulk density of （471 ±0.8）kg/m3 ,a moisture retention capacity of （49 ± 1.3）% , a specific surface area of 3.91 m2/g, an average strength of （427.3 ± 0.2）N,and pH of 10.5 ± 0.2. The filler could retain well bonding strength in high humidity environment for a long time and provide nutrients for the growth of microorganisms,in addition,it could prevent the large fluctuate of pH. At the beginning of the experiment,the quantity of microorganism was 5.3 × 10 5CFU/g. After 60 days,the quantity increased to × 10 5CFU/g. The microorganism decreased slightly after 30 days＇ lay-up period,while the purification efficien- cy almost stayed at the same level after restarting. The removal efficiency of NOx remained over 93.15% when the intake loading of BF1 was less than 1 878 g/（m3· h） and EBRT was 14.47 s.