In order to minimize environmental pollution caused by the wastewater produced in the manufacturing process of conventional poly(vinyl alcohol) (PVA) sponge, applying with the case study, a new method of reusing recycled wastewater is proposed in the present study. This method replaces our previous method in which the wastewater can only be reused once. The acidified starch and the residual partially polymerized PVA make the reused wastewater too viscous to be agitated homogenously. So, instead of recycling all of the wastewater produced, we only reuse part of it and supplement it with fresh reactant solution. With the reactant ingredients determined in the resupplied solution, we find that the present proposed method allows the recycled wastewater to be reused at least twice. In the meantime, the quality of the conventional PVA sponge as a superabsorbent can be maintained very well.

为了最大程度地减少传统聚乙烯醇（PVA）海绵生产过程中产生的废水对环境的污染，结合案例研究，提出了一种新的再生废水回用方法。该方法替代了我们以前的方法，在以前的方法中，废水只能重复使用一次。酸化的淀粉和残留的部分聚合的PVA会使再利用的废水太粘而无法均匀搅拌。因此，我们不回收所有产生的废水，而是仅对其中的一部分进行再利用，并补充新鲜的反应液。通过在重新提供的溶液中确定反应物成分，我们发现本建议的方法允许将回收的废水至少重复使用两次。同时，