1、确认所有阀门位置正确，不会产生背压等不良状况；

2、配置化学清洗液1%EDTA-4Na（重量比），用氢氧化钠水溶液调节PH在PH值在10-11.5之间，控制溶液温度约30℃；

步骤3-6参考酸洗3-6步骤；

7、循环清洗结束后停止清洗泵，对系统进行1小时浸泡；

8、浸泡结束后，重复步骤6；

9、碱洗结束，排放掉清洗液罐中碱清洗液，将清洗液罐洗干净后，灌满纯水；

10、开启清洗液泵，调节浓缩液出口阀，观测并记录测试膜系统纯水通量和操作压力与（酸洗3）的操作条件相同，同时记录出此时膜系统纯水通量和操作压力。

1. Confirm that all valve positions are correct and there will be no adverse conditions such as back pressure；

2. Prepare a chemical cleaning solution of 1% EDTA-4Na (by weight), adjust the pH value between 10 and 11.5 with sodium hydroxide aqueous solution, and control the solution temperature to about 30 ℃；

Steps 3-6 refer to pickling steps 3-6；

7. After the cycle cleaning is completed, stop the cleaning pump and soak the system for 1 hour;

8. After soaking, repeat step 6；

9. After the alkaline cleaning is completed, discharge the alkaline cleaning solution from the cleaning solution tank. After cleaning the cleaning solution tank, fill it with pure water；

10. Turn on the cleaning solution pump, adjust the concentrated solution outlet valve, observe and record the pure water flux and operating pressure of the testing membrane system under the same operating conditions as (acid washing 3), and record the pure water flux and operating pressure of the membrane system at this time.