The pretreatment by the Fe/Cu Catalyzed Inner Electrolysis System for enhancing biodegradability of the mixed wastewater

摘要

The Fe/Cu catalyzed inner electrolysis system was used to treat actual mixed wastewater to evaluate the ecological safety and feasibility of the technology. The pretreatment by the Fe/Cu process removed 30% of COD, which reduced the loading rate of the subsequent biological treatment. Meanwhile, BOD5/COD ratio was increased by about 160%, which created favorable conditions for the subsequent biological treatment. The results indicated that the optimal mass ratio of Fe and Cu was 4:1, the technology covered wider pH range: the wastewater responded well to the reduction when the influent pH changed from 4 to 8, the reaction times was 120 min. Furthermore, the consumption of iron was low. All these led to an easy maintenance and low operating cost.