| 给水管网管壁铁细菌生长特性模拟及控制对策研究 |
| 摘要点击 2626 全文点击 2587 投稿时间：2008-12-21 修订日期：2009-02-10 |
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| 中文关键词 铁细菌 给水管网 生长特性 腐蚀控制 余氯 |
| 英文关键词 iron bacteria drinking water distribution system growth characteristics corrosion control chlorine residual |
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| 中文摘要 |
| 利用AR反应器对管壁铁细菌的生长特性、影响因素以及悬浮铁细菌与管壁铁细菌的相关关系进行了研究.管壁铁细菌在反应器运行12 d后达到稳定生长，出水中铁细菌数量比进水增加1 lg，剪切力对于铁细菌达到稳定生长的时间有影响，但对稳定生长后挂片上的铁细菌数量没有明显的影响.稳定余氯0.3 mg/L可以有效控制悬浮和管壁铁细菌的生长，数量降低1 lg；对于管垢内的铁细菌即使余氯增加到1.0 mg/L仍无法杀灭；余氯浓度0.05 mg/L无法有效控制悬浮和管壁附着铁细菌的生长.对于稳定生长下的管壁铁细菌，增加余氯浓度至1.25 mg/L，可使管壁铁细菌数量降低2 lg～3 lg.稳定生长状态下，悬浮铁细菌与管壁铁细菌数量具有线性关系.并在试验基础上提出给水管网铁细菌生长控制对策：维持管网余氯0.3 mg/L；定期采用较高浓度消毒剂冲洗管道；采用新型防腐管材或加快旧管网改造，提高管网抗腐蚀性能等. |
| 英文摘要 |
| This study investigated the growth characteristics of iron bacteria on cast iron and relationship between suspended and attached iron bacteria. The steady-state growth of iron bacteria would need 12 d and iron bacteria level in effluents increased 1 lg. Hydraulics influence on iron bacteria level and detachment rate of steady-state attached iron bacteria was not significant. But it could affect the time of attached iron bacteria on cast-iron coupons reaching to steady state. When the chlorine residual was 0.3 mg/L, the iron bacteria growth could be controlled effectively and suspended and attached iron bacteria levels both decreased 1 lg. When the chlorine residual was more than 1.0 mg/L, it could not inactivate the iron bacteria of internal corrosion scale yet. There was little effect on inhibiting the iron bacteria growth that the chlorine residual was 0.05 mg/L in drinking water quality standard of China. The iron bacteria on coupons reached to steady state without disinfectant and then increased the chlorine residual to 1.25 mg/L, the attached iron bacteria level could decrease 2 lg to 3 lg. Under steady-state, the suspended iron bacteria levels were linearly dependent on the attached iron bacteria. The control of iron bacteria in drinking water distribution systems was advanced: maintaining the chlorine residual (0.3 mg/L), flushing the pipeline with high dosage disinfectant, adopting corrosion-resistant pipe materials and renovating the old pipe loop. |
