Study on recycling iron-rich sludge produced by Fenton process in pulping waste water treatment

This paper studied on the basic properties of chemical sludge, recovered the iron ions from acidification, and then discussed the recovery production. The experiment results showed that the recovery of ferric salt and the decrement of the total solid could reach 74.8%, 87.3% respectively, after acidizing 20 minutes . The sludge production and secondary pollution would be reduced by this treatment, in addition, the recovery ferric salt can be used on treating pulping wastewater, and the coagulation result is quite consistent with using industrial polymeric ferric sulfate, thereby reducing water treatment cost, having certain economical significance.