季节性氯耗增高已困扰B水厂多年 ,通过大量实测水质数据分析 ,得出其原因是滤池中存在季节性不完全硝化反应 ,生成的亚硝酸盐氮消耗大量的氯。针对季节性氯耗增高的原因 ,提出了解决这一问题的根本办法、长远对策和临时性措施。实践证明 ,虽然 3种临时性措施有效地降低了氯耗 ,但从饮用者和长远的角度出发 ,应考虑增设生物预处理措施 The increase in seasonal chlorine consumption has been plagued by B water plants for many years. Through analysis of a large number of measured water quality data, the reason is that there is a seasonal incomplete nitrification reaction in the filter tank, and the generated nitrite nitrogen consumes a large amount of chlorine. Based on the reasons for the increase in seasonal chlorine consumption, a basic solution, a long-term strategy, and temporary measures have been proposed to solve this problem. Practice has proved that although three kinds of temporary measures have effectively reduced the consumption of chlorine, from the perspective of the drinker and the long-term perspective, additional biological pretreatment measures should be considered.