细菌降解非离子表面活性剂的研究

从石油污染的土壤中分离到２株能利用非离子表面活性剂ＡＥＯ－９和ＳＡ－２０作为唯一碳源生长的细菌。这２株菌被定名为假单胞杆菌５２（Ｐｓｅｕｄｏｍｏｎｏｓ５２）和Ｗｅｅｋｓｅｌｌａ６．最适于这２株菌利用非离子表活剂ＡＥＯ－９的培养条件是乙酸胺作为氮源，ｐＨ７．３０℃添加少量葡萄糖促进表活性的降解，降解速率的研究表明，当ＡＥＯ－９的初始浓度为５０００ｍｇ／Ｌ时，５２号菌和６号菌能在２周内将其去除８５％，

Study on Biodegradation of Nonionic Surfactant by Bacteria

Two strains isolated from soil contaminated by petroleum chemicals,Pseudomonos sp.strain 52 and Weeksella sp.strain 6 could utilize nonionic sndactants(AEO-9 and SA-20)as sole source of carbon for growth.The experiment results showed that the optimum source of nitrogen was ammonium acetate,the optimum PH and temperature for the degradation were 7.0 and 30C.It was found that addition of glucose enhanced biodegradation of AEO9.With the initial concentration of 5 000 mg/L the growth cells of the two strains had an AEO-9 removal efficiency of 85% and 95% within 2 weeks or 4 weeks,respeCtively. The biodegradation rate of AEO-9, in the same initial concentration,by resting cells of strain 52was 60% within 6. 5 hours under the optimum degradation condition in which PH,temperature and cell density (wet weight/volume)was 7.0.30C and 20%,respectively.