Research On The Influences Of Sludge Disintegration By Fenton Reagent Oxidation And Anaerobic Biodegradability

In this study, the high moisture content of the sewage treatment plant mixing tank sludge pretreated by Fenton oxidation process, the influences of Fenton oxidation parameters on the effect of sludge disintegration and the anaerobic biodegradability characteristics of cracked sludge were investigated, with studying of the anaerobic biodegradability by Fenton oxidation pretreatment sludge to anaerobic digestion research and process design to provide a basis for theoretical reference.With the content of protein, carbohydrate, soluble chemical oxygen demand (SCOD) in sludge supernatant, and total suspended solids(TSS), volatile suspended solids(VSS) of sludge as characterization parameters of disintegration effect, the influences of Fenton oxidation parameters, such as pH value, dosage ratio of H2O2/Fe2+, reaction temperature and and reaction time, on the effect of sludge disintegration were investigated.Results showed that the optimal operational condition was pH of5.00, H2O2/Fe2+(weight dosage ratio) of24:1, reaction temperature of70℃and reaction time of90min, respectively. Under this condition, SCOD, soluble protein and polysaccharide content increased from88.76mg/L,19.70mg/L and14.95 mg/L to3714.64mg/L,2039.90mg/L and289.70mg/L, respectively; Additionally, TSS and VSS value decreased from34.60g/L,19.76g/L to26.60g/L,14.22g/L, respectively, with the removal efficiency of TSS and VSS23.12%and28.14%.The anaerobic biodegradability of sludge can reflect the efficiency of the anaerobic digestion. The biochemical methane potential (BMP) and anaerobic biodegradability (BD%) of Fenton oxidation cracked sludge and hydrogen peroxide cracked sludge were investigated. The results showed that, the BMP of raw sludge, hydrogen peroxide cracked sludge and Fenton oxidation cracked sludge were14.52mL/g,73.23mL/g and121.18mL/g, respectively. The biodegradable (BD%) of raw sludge, Fenton oxidation cracked sludge and hydrogen peroxide cracked sludge were4.15%,20.90%and34.60%, respectively. The biodegradability of hydrogen peroxide cracked sludge was increased4.04approximately times than the raw sludge; The biodegradability of Fenton oxidation cracked sludge was increased about28.20times than raw sludge. It showed that, the organics of Fenton oxidation cracked sludge can be utilized of the high efficiency by anaerobic microbial.The biodegradability (BD%) of Fenton oxidation cracked sludge was34.60%, indicating that the organics of Fenton oxidation cracked sludge that can be utilized by anaerobic accounted for34.60%of total organics. As a result, Fenton oxidation is an effective method for sludge reduction, which can effectively promote decomposition of the sludge flocs, and be beneficial to follow-up anaerooic aigesuon irearment.