Removal of Dye Wastewater COD by Sludge Based Activated Carbon

Chen, J.; Wang, X.; Liu, X.; Huang, J., and Xie, Z., 2015. Removal of dye wastewater COD by sludge based activated carbon. In this paper, activated carbon prepared by chemical activation based on dye sludge was used to treat dye wastewater to remove dye wastewater COD. Experiments with KOH and H3PO4 treated the original activated sludge, and set adding fly ash activated sludge as the control group. COD removal experiment results showed that: KOH as activator, the activation temperature and activation time is 60 min at 600 conditions activated sludge obtained with relative maximum iodine value, and when the adsorption time in 15 min ˜ 20 min time, COD removal rate could reach above 95%. Under the same conditions, raw sludge directly activated sludge pyrolysis also has good COD removal; the best removal rate is up to 90%. The experimental results of COD removal of activated carbon in the fly ash added after the original sludge pyrolysis obtained showed that the addition of fly ash to COD removal did not play a synergistic effect. This work provided a simple and eco-friendly method for dye wastewater treatment with recycling of waste.