关键词: 铁细菌（IB）, 黏液形成菌（HB）, 硫酸盐还原菌（SRB）, 微生物污垢, 致垢能力

Abstract: This study simulated dynamical fouling process of three fouling microorganisms, i.e. iron bacteria (IB)，sulfate-reducing bacteria (SRB)，and slime forming bacteria (HB)，and their mixtures isolated from the slime in the bottom of circulating cooling tower. Experimental conditions were kept constant at 30 ℃ water temperature and 0.4 m/s flow rate. The fouling resistances for IB，SRB，HB and their mixture were by ICP-MS and anion analysis of fouling samples was investigated. The results showed that the induction time of fouling for the four groups were 28 h，45 h，70 h and 18 h，respectively. The fouling resistance asymptotic values were 2×10?4 m2?K/W，1.75×10?4 m2?K/W，1.45×10?4 m2?K/W and 4.9×10?4 m2?K/W，respectively. The fouling abilities of the four groups were in the order of mixture＞IB＞SRB＞HB. The composition analysis of fouling samples showed that IB contained relatively high concentrations of Fe，C and NO3? ，and low contents of heavy metal ions and Cl?， indicating abilities of strong fouling and weak corrosion. The SRB sample contained mainly S，Fe，Cl?，Ni and Cr，indicating strong corrosion abilities. The HB sample mainly contained C，N，NO3? and certain amount of Cl?，showing its ability of corrosion.

Key words: iron bacteria, sulfate-reducing bacteria, slime forming bacteria, biofouling, fouling ability