Fig. 4.
Photographs of skim latex coagulation (A) with conc. H
2
SO
4
(B) with 10 wt% H
2
SO
4
and (C) with NHPA
+ 10 wt% H
2
SO
4
.
Quality of waste water in terms of BOD and COD are shown in Fig. 5. It can be seen that lower BOD was
observed in the latex with NHPA. This indicates better quality of the waste water for the latex with NHPA.
Fig. 5.
BOD (mg/L) and COD (mg/L) of waste water.
