Stampi S, Varoli O, Zanetti F, De Luca G
Institute of Hygiene, Bologna University, Italy.
Epidemiol Infect. 1993 Jun;110(3):633-9. doi: 10.1017/s0950268800051050.
Microaerophilic organisms were monitored in sewage effluent undergoing two secondary treatments: air and oxygen-activated sludge. The mean numbers of Arcobacter cryaerophilus and thermophilic campylobacters detected in incoming sewage were 5639/100 ml and 1720/100 ml respectively. Secondary treatment in air tanks reduced the population of A. cryaerophilus by 97.1% and of thermophilic campylobacters by 99.08%, whereas treatment in oxygen tanks reduced the bacteria 97.8% and 99.63% respectively, showing that oxygen-activated sludge treatment was more effective. Subsequent tertiary treatment with 2 p.p.m. chlorine dioxide evidenced the removal of A. cryaerophilus to 99.9% and eliminated thermophilic campylobacters. Campylobacter jejuni and C. coli constituted 54.1% and 45.9% of 74 thermophilic campylobacter strains isolated. In air-activated sludge effluent C. jejuni was found more often, thus appearing more sensitive to oxygen. The most probable number assay used for detection of campylobacters, blood medium for enrichment and blood-free medium for plating, also appeared to be fit for A. cryaerophilus, the high density of which in urban sewage may be due to inflows from slaughterhouses.
对经过两种二级处理（曝气和氧气活性污泥法）的污水排放物中的微需氧微生物进行了监测。在进入的污水中检测到的嗜低温弓形杆菌和嗜热弯曲杆菌的平均数量分别为5639/100毫升和1720/100毫升。曝气池中的二级处理使嗜低温弓形杆菌数量减少了97.1%，嗜热弯曲杆菌数量减少了99.08%，而在氧气池中处理分别使细菌数量减少了97.8%和99.63%，这表明氧气活性污泥处理更有效。随后用2 ppm的二氧化氯进行三级处理，结果显示嗜低温弓形杆菌的去除率达到99.9%，嗜热弯曲杆菌被消除。空肠弯曲杆菌和结肠弯曲杆菌分别占分离出的74株嗜热弯曲杆菌菌株的54.1%和45.9%。在曝气活性污泥排放物中，空肠弯曲杆菌更常见，因此似乎对氧气更敏感。用于检测弯曲杆菌的最可能数测定法、用于富集的血液培养基和用于接种的无血培养基，似乎也适用于嗜低温弓形杆菌，其在城市污水中的高密度可能归因于来自屠宰场的流入物。
