Figure 11 shows the variation in treatment efficiency
for turbidity by each treatment process for the
four sampling days. The treatment efficiency for
turbidity is 24.15–99.36%. The treatment efficiency
for turbidity removal is obvious except wastewater
basin. Figure 12 shows the variation in treatment
efficiency for COD by each treatment process for the
four sampling days. The treatment efficiency of COD
removal during the four samplings is inconsistent.