Chang B V, Chiang F, Yuan S Y
Department of Microbiology, Soochow University, Taipei 111, Taiwan.
Chemosphere. 2005 Sep;60(11):1652-9. doi: 10.1016/j.chemosphere.2005.02.042. Epub 2005 Apr 9.
We investigated the effects of various factors on the aerobic degradation of nonylphenol (NP) in sewage sludge. NP (5 mg/kg) degradation rate constants (k1) calculated were 0.148 and 0.224 day(-1) for the batch experiment and the bioreactor experiment, respectively, and half-lives (t(1/2)) were 4.7 and 3.1 days, respectively. The optimal pH value for NP degradation in sludge was 7.0 and the degradation rate was enhanced when the temperature was increased and when yeast extract (5 mg/l) and surfactants such as brij 30 or brij 35 (55 or 91 microM) were added. The addition of aluminum sulfate (200 mg/l) and hydrogen peroxide (1 mg/l) inhibited NP degradation within 28 days of incubation. Of the microorganism strains isolated from the sludge samples, we found that strain CT7 (identified as Bacillus sphaericus) manifested the best degrading ability.
我们研究了各种因素对污水污泥中壬基酚（NP）好氧降解的影响。在批次实验和生物反应器实验中，计算得出的NP（5毫克/千克）降解速率常数（k1）分别为0.148天⁻¹和0.224天⁻¹，半衰期（t(1/2)）分别为4.7天和3.1天。污泥中NP降解的最佳pH值为7.0，当温度升高以及添加酵母提取物（5毫克/升）和表面活性剂如Brij 30或Brij 35（55或91微摩尔）时，降解速率会提高。添加硫酸铝（200毫克/升）和过氧化氢（1毫克/升）在培养28天内抑制了NP的降解。从污泥样品中分离出的微生物菌株中，我们发现菌株CT7（鉴定为球形芽孢杆菌）表现出最佳的降解能力。
