Study on pretreatment of regeneration papermaking wastewater by intensified micro-electrolysis

Changhai Li and Yuejin Li

Abstract

In this paper, using the method of H2O2 – micro-electrolysis / MnO2 to treat the papermaking waste water, the effect of initial pH of raw water, total iron and carbon, proportion of iron and carbon, hydraulic retention time, the amount of MnO2 as well as H2O2 dosing quantity in micro—electrolysis unit were investigated. The results show that the initial pH was 3.0, the dosage of iron and carbon was 20 g/L, the MnO2 dosage was 2.5 g/L, H2O2 dosing quantity is 0.55 g/L, the proportion of iron and carbon was 1:1 and the reaction time was 50 min, under these conditions, the removal rates of COD、SS、ammonia nitrogen, total phosphorus and BOD5 were reached to 88%, 98.4%, 85%, 98% and 52% . At the same time, biodegradability increased from 0.32 to 0.81, the pollution load of subsequent biochemical treatment process was reduced.