[A correlative study on heterotrophic bacteria and the main pollutant in city lakes' water].
OBJECTIVE
To provide scientific basis for bioremediation of city lake, the distribution of heterotrophic bacteria and its correlation with major pollutions condition were studied.


METHODS
Puping Lake and Moshui Lake of Wu Han City were choosen as the objects of our study. COD(cr) TOC, TP and TN were determined in sampled freshwater and sediment via the standard methods. At the same time the bacteria was cultivated.


RESULTS
The average value of COD(cr), TOC, TP and TN were 8. 934 mg/L, 5.125 mg/L, 0.089 mg/L, 4.739 mg/L in Puping Lake and 86.296 mg/L,13.255 mg/ L, 1.796 mg/L, 7.325 mg/L in Moshui Lake. Ten strains of heterotrophic bacteria were isolated from the sample and they are Pseudomonas, Bacillus, Enterobateriaceae, Aeromonas and Coccus. The dominant strain in water was Pseudomonas. The proportion of Bacillus in sediment was relatively higher. In the two lakes, the average bacteria counts were 1.90 x 10(3) CFU and 5.53 x 10(4) CFU per mL in water, 3.12 x 10(5) CFU and 5.06 x 10(5) CFU per g in sediment.


CONCLUSIONS
Puping Lake and Moshui Lake were polluted seriously according to the standard; Gram negative rods were the main types in water, and the dominant type was Pseudomonas, the Gram positive bacteria was Bacillus; The type and quantity of bacteria in Moshui Lake were higher than those in Puping Lake, and there were correlations between the quantity of bacteria and the pollutants.
Huang
Li-Jing
LJ
Institute of Environmental Medicine, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China.
Yun
Luo-Jia
LJ
Wang
Lin
L
Zhang
Xiao-He
XH
D001407:Bacillus / Q000302:isolation & purification*; D002681:China; D002947:Cities; D005618:Fresh Water / Q000032:analysis*; D011549:Pseudomonas / Q000302:isolation & purification*; D014871:Water Microbiology; D014874:Water Pollutants, Chemical / Q000032:analysis*
D014874:Water Pollutants, Chemical