求翻译：图2-10中，整个周期内，有磁粉反应器废水的pH值一直低于无磁粉反应器的pH值，且pH值都是呈先降低后升高的趋势，说明了微生物水解酸化和酸消耗这两个过程的交替。是什么意思？

In Figure 2-10, the whole cycle, magnetic particle reactor for wastewater pH values pH value has been lower than the non-power reactor, and the pH value is of lower before rising trend, explains microbial hydrolytic acidification and acid consumption of these two processes alternate.