中国环境科学
中國環境科學
중국배경과학
CHINA ENVIRONMENTAL SCIENCE
2014年
8期
1979-1984
,共6页
活性污泥法%污泥负荷%磺胺嘧啶抗性异养菌%生长%排放
活性汙泥法%汙泥負荷%磺胺嘧啶抗性異養菌%生長%排放
활성오니법%오니부하%광알밀정항성이양균%생장%배방
activated sludge system%sludge loading rate%sulfadiazine-resistant heterotrophic bacteria%growth%release
为了研究污水生物处理工艺中抗药性细菌生长和分布特性及污泥负荷的影响,构建了不同处理负荷的活性污泥工艺,并以磺胺嘧啶抗性异养菌为例,阐述了污泥负荷对活性污泥系统中典型抗药细菌的生长及排放特性的影响.结果表明,污泥负荷增大有利于磺胺嘧啶抗性异养菌的生长繁殖,负荷提高后净比生长速率和细菌产量分别由0.32d-1和2.3×106CFU/d提高至0.33d-1和3.1×106CFU/d,活性污泥、出水和剩余污泥中抗药菌的浓度也均显著提高(P<0.05),但对抗药细菌的相对丰度无显著改变.低污泥负荷下[0.24kg COD/(kg MLSS?d)]抗药细菌主要通过剩余污泥形式排放,排放量比(泥中排放量/水中排放量)为28.4；负荷提高至0.4kg COD/(kg MLSS?d)后,出水抗药细菌排放量显著提高,排放量比为1.1.处理相同水量,高污泥负荷下排放的抗药细菌总量明显降低,提高污泥负荷有利于活性污泥系统抗药性风险的控制.
為瞭研究汙水生物處理工藝中抗藥性細菌生長和分佈特性及汙泥負荷的影響,構建瞭不同處理負荷的活性汙泥工藝,併以磺胺嘧啶抗性異養菌為例,闡述瞭汙泥負荷對活性汙泥繫統中典型抗藥細菌的生長及排放特性的影響.結果錶明,汙泥負荷增大有利于磺胺嘧啶抗性異養菌的生長繁殖,負荷提高後淨比生長速率和細菌產量分彆由0.32d-1和2.3×106CFU/d提高至0.33d-1和3.1×106CFU/d,活性汙泥、齣水和剩餘汙泥中抗藥菌的濃度也均顯著提高(P<0.05),但對抗藥細菌的相對豐度無顯著改變.低汙泥負荷下[0.24kg COD/(kg MLSS?d)]抗藥細菌主要通過剩餘汙泥形式排放,排放量比(泥中排放量/水中排放量)為28.4；負荷提高至0.4kg COD/(kg MLSS?d)後,齣水抗藥細菌排放量顯著提高,排放量比為1.1.處理相同水量,高汙泥負荷下排放的抗藥細菌總量明顯降低,提高汙泥負荷有利于活性汙泥繫統抗藥性風險的控製.
위료연구오수생물처리공예중항약성세균생장화분포특성급오니부하적영향,구건료불동처리부하적활성오니공예,병이광알밀정항성이양균위례,천술료오니부하대활성오니계통중전형항약세균적생장급배방특성적영향.결과표명,오니부하증대유리우광알밀정항성이양균적생장번식,부하제고후정비생장속솔화세균산량분별유0.32d-1화2.3×106CFU/d제고지0.33d-1화3.1×106CFU/d,활성오니、출수화잉여오니중항약균적농도야균현저제고(P<0.05),단대항약세균적상대봉도무현저개변.저오니부하하[0.24kg COD/(kg MLSS?d)]항약세균주요통과잉여오니형식배방,배방량비(니중배방량/수중배방량)위28.4；부하제고지0.4kg COD/(kg MLSS?d)후,출수항약세균배방량현저제고,배방량비위1.1.처리상동수량,고오니부하하배방적항약세균총량명현강저,제고오니부하유리우활성오니계통항약성풍험적공제.
In order to study the propagation and distribution of antibiotic-resistant bacteria (ARB) in the typical biological treatment process, an activated sludge system with different sludge loading rates was constructed. The effect of sludge loading rate on the growth and release of sulfadiazine-resistant bacteria in the system was then studied. The results indicated that a higher sludge loading rate promoted the growth of sulfadiazine-resistant bacteria. The net specific growth rate and the bacteria production increased from 0.32d-1 and 2.3×106CFU/d to 0.33d-1 and 3.1×106CFU/d, respectively. The concentration of sulfadiazine-resistant bacteria in activated sludge, effluent and biosolids all increased significantly (P<0.05) with increased sludge loading rate, while the antibiotic resistant characteristic changed slightly. The biosolids was the main released pattern for sulfadiazine-resistant bacteria in the low sludge loading rate [0.24kg COD/(kg MLSS?d)] system, and the released ratio (biosolid/effluent) was 28.4. By comparison, much more bacteria were discharged through effluent in the higher sludge loading rate [0.4kg COD/(kg MLSS?d)] system, with the release ratio (biosolid/effluent) of 1.1. The total discharging load decreased significantly in the system with higher sludge loading rate, which was benefical to the potential ARB risk control.
