中文摘要：

对1级1段超滤水处理系统中膜组件的化学清洗问题进行了研究，改进了膜污染模型，给出清洗依据，规划期为2年，1个月为1个时段，以规划期内总的操作费用最小为目标，将膜组件的化学清洗表达为一个混合整数非线性规划（MINLP）问题，用GAMS软件进行求解，得出规划期内膜组件的最佳清洗时机。算例结果表明，提出的超滤膜组件的化学清洗策略和求解方法是可行的，与实际生产中膜组件的清洗操作相一致。

英文摘要：

The problem of chemical cleaning of membrane modules for single-stage ultrafiltration water treatment system was investigated in this paper.The membrane fouling model was modified and the criterion of cleaning was given.The chemical cleaning problem of membrane modules can be expressed as a mixed-integer non-linear programming（MINLP） with the minimum total operation cost as target during two years projection period while one month one period,and the optimal cleaning time during the whole projection period can be obtained by solving it by GAMS software.The results of the example indicated that the chemical cleaning strategy and solving method provided was effective for the membrane maintenance.