V. SUMMARY AND CONCLUSIONS

The capability of the Mapecon AC to lower the COD of water samples from a part of Pasig River was studied at ambient temperature. The kinetics of adsorption of organics was also computed. The characteristics of the AC were also determined and the Iodine number was validated.
Results showed that the AC has moisture content of 6%, bulk density of 0.579 g/mL, and Iodine number of 841 ± 22.

It was determined that the contact time required to reach the concentration equilibrium is 30 minutes. The maximum adsorption can be attained at pH 5.5 compared to pH 6.5, pH 7.1, and pH 8.5. This implies that the AC has more negatively charged surface areas.

The rate of adsorption of organics onto AC can be described by the equation –r = 0.72088[C-Ce]1.3445 .

it was found that at pH 5.5, using 22 mg AC, the initial COD of 83.23 ppm can be lowered by 61.42 %