Subsequent SBR Treatment Promoted By Inner Electrolysis Process

In the paper, the influences of inner electrolysis process (IEP) on subsequent SBR treatment were studied. At first, the optimal treatment conditions of IEP were found through monitoring decolourisation efficiency and the iron content. Simultaneously, the optimal treatment conditions of SBR were also sought through monitoring COD removal. Then, COD and color degradation efficiencies, the biodegradable characteristic of the wastewater and the properties of the activated sludge in SBR process were compared with that in the inner electrolysis-SBR combined process. The experiments showed that inner electrolysis improved the biodegradable characteristic of the wastewater and reduced the color of the wastewater, which was helpful to subsequent treatment. Meanwhile, with the increase of pH and the concentration of dissolved oxygen in the biochemical reactor, iron ions released from inner electrolysis reaction formed into iron hydroxide colloid, which has strengthened the activated sludge in the bioreactor. The concentration of activated sludge in the reactor were increased, and resulted in a lower COD load over the activated sludge. The IEP promoted the subsequent SBR treatment. The inner electrolysis-SBR combined process is superior to single SBR process in COD removal and decolourisation .