Because the sewage treatment system is a closed-loop system, it can be used for a long time in the design life. If it needs to be replaced, it is because of a serious failure or aging problem, resulting in the system can not operate normally. At this time, it is necessary to dismantle the old sewage treatment system and install a new one. So this situation does not need to be replaced.

In addition, if the sewage treatment system in Guangxi has been used for a long time, or the treatment efficiency has decreased, we should also consider replacing it. In this case, it is necessary to upgrade the old sewage treatment system to improve the treatment efficiency and meet the requirements of environmental protection.