Through PVA is excellent size, it is difficult to biodegrade and pollutes environment.
PVA虽上浆性能优良，但不易生物降解，严重污染环境。
Dye printing wastewater is very difficult to deal with because of its complex component and it is difficult to biodegrade.
印染废水由于其组分复杂，可生化性差，因而其治理难度较大。
With the increase in pesticide wastewater of compounds that are difficult to biodegrade conventional biochemical treatment methods cannot completely remove contaminants from wastewater.
摘要随着农药废水中难生物降解化合物的增加，常规的生化处理方法无法完全去除水中的污染物。
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