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This study employed Pseudomonas aeruginosa wild-type (WT), an exopolysaccharide (EPS)-overproducing strain (ΔmucA), and a flagellum-deficient mutant (ΔfliC) as model organisms. Combining the XDLVO theory, we systematically investigated the effects of bacterial surface structures, ionic strength, and chlorination on bacterial adhesion and chlorine resistance to polyethylene (PE) and polypropylene (PP) MPs. Key findings revealed that EPS secretion enhanced cell hydrophobicity (increasedγLW and decreased γAB in ΔmucA), significantly reducing the repulsive energy barrier (ΦT) and thereby promoting bacterial adhesion and survival on MPs. Flagella facilitated adhesion through electrostatic attraction and amplified the protective effect of MPs on bacteria. Ionic strength (NaCl) exhibited a dual effect: at ≤30mmol/L, double-layer compression reduced the repulsive barrier by 19%, markedly enhancing adhesion, whereas at 100mmol/L, Cl- adsorption induced charge reversal, inhibiting adhesion. Although chlorination (1.0mg/L) effectively inactivated free bacteria, it increased bacterial adhesion rates on MPs by 45%~75% through enhanced van der Waals attraction (), consequently elevating chlorine resistance(up to 2.48-fold).
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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