Effect of deflocculation on the efficiency of sludge reduction by Fenton process

A novel approach to improve the efficiency of Fenton treatment for sludge reduction through the implication of a deflocculating agent citric acid, for the exclusion of extracellular polymeric substances (EPS) from waste-activated sludge (WAS), was investigated. Deflocculation was achieved with 0.06 g/g suspended solids (SS) of citric acid dosage. Fenton optimization studies using response surface methodology (RSM) revealed that 0.5 and 0.0055 g/g SS were the optimal dosages of H2O2 and Fe2+. The addition of a cation-binding agent set the pH value of sludge to 5 which did not affect the Fenton efficiency. The results presented in this study shows the advantage of deflocculating the sludge as SS and volatile suspended solids (VSS) reductions were found to be higher in the deflocculated (53 and 63 %, respectively) than in the flocculated (22 and 34 %, respectively) sludges. Kinetic investigation of the treatment showed that the rate of the reaction was four times higher in the deflocculated sludge than control. The methodology reported in this manuscript was successfully applied to a real case were the deflocculated mediated Fenton process reduced the sludge disposal cost from 297.8 to 61.9 US dollars/ton of sludge.

[1]  S. Kaliappan,et al.  Achieving profitable biological sludge disintegration through phase separation and predicting its anaerobic biodegradability by non linear regression model , 2015 .

[2]  A. E. Greenberg,et al.  Standard methods for the examination of water and wastewater : supplement to the sixteenth edition , 1988 .

[3]  S. Kavitha,et al.  Enhancing the functional and economical efficiency of a novel combined thermo chemical disperser disintegration of waste activated sludge for biogas production. , 2014, Bioresource technology.

[4]  C. Sanjosé,et al.  Bacterial biofilm removal using fungal enzymes , 2006 .

[5]  J. Burgess,et al.  Hydrolytic enzymes in sewage sludge treatment: A mini-review , 2018, Water SA.

[6]  J. Rajesh Banu,et al.  Enhancement of waste activated sludge reduction potential by amalgamated solar photo-Fenton treatment. , 2016 .

[7]  H. Carrère,et al.  Solubilisation of waste-activated sludge by ultrasonic treatment , 2005 .

[8]  Mi‐Sun Kim,et al.  Increased solubilization of excess sludge does not always result in enhanced anaerobic digestion efficiency. , 2013, Bioresource technology.

[9]  Effect of sludge pretreatment on the performance of anaerobic/ anoxic/ oxic membrane bioreactor treating domestic wastewater , 2011 .

[10]  N. Zhu,et al.  Conditioning of sewage sludge with electrolysis: effectiveness and optimizing study to improve dewaterability. , 2010, Bioresource technology.

[11]  P. Lens,et al.  Extraction of extracellular polymeric substances (EPS) from anaerobic granular sludges: comparison of chemical and physical extraction protocols , 2010, Applied Microbiology and Biotechnology.

[12]  I. Yeom,et al.  Enhancing aerobic digestion potential of municipal waste-activated sludge through removal of extracellular polymeric substance , 2013, Environmental Science and Pollution Research.

[13]  M. Ksibi.  Chemical oxidation with hydrogen peroxide for domestic wastewater treatment , 2006 .

[14]  E. Dey,et al.  Solubilisation of sludge by combined chemical and enzymatic treatment , 2007 .

[15]  M. Badawy,et al.  Fenton's peroxidation and coagulation processes for the treatment of combined industrial and domestic wastewater. , 2006, Journal of hazardous materials.

[16]  S. Esplugas,et al.  Use of Fenton reagent to improve organic chemical biodegradability. , 2001, Water research.

[17]  K. Barbusiński,et al.  Aerobic sludge digestion in the presence of chemical oxidizing agents. Part II. Fenton's reagent , 2000 .

[18]  Xinwen Liu,et al.  Effects of potassium ferrate on extracellular polymeric substances (EPS) and physicochemical properties of excess activated sludge. , 2012, Journal of hazardous materials.

[19]  Yangfang Ye,et al.  Effects of Microwave Irradiation on Dewaterability and Extracellular Polymeric Substances of Waste Activated Sludge , 2013, Water environment research : a research publication of the Water Environment Federation.

[20]  I. Yeom,et al.  Improving the amenability of municipal waste activated sludge for biological pretreatment by phase-separated sludge disintegration method. , 2014, Bioresource technology.

[21]  Huaiyong Zhu,et al.  Discoloration and mineralization of Reactive Red HE-3B by heterogeneous photo-Fenton reaction. , 2003, Water research.

[22]  Jialin Liang,et al.  A rapid Fenton treatment technique for sewage sludge dewatering , 2015 .

[23]  Yoshinori Kawase,et al.  Photo-Fenton process for excess sludge disintegration , 2007 .

[24]  Raf Dewil,et al.  Fenton peroxidation improves the drying performance of waste activated sludge. , 2005, Journal of hazardous materials.

[25]  Meiqing Lin,et al.  Effects of ultrasound assisted Fenton treatment on textile dyeing sludge structure and dewaterability , 2014 .

[26]  J. Baeyens,et al.  A review of classic Fenton's peroxidation as an advanced oxidation technique. , 2003, Journal of hazardous materials.

[27]  R. J. Bigda.  Consider Fenton`s chemistry for wastewater treatment , 1995 .

[28]  L. Shao,et al.  Characteristics of extracellular polymeric substances (EPS) fractions from excess sludges and their effects on bioflocculability. , 2009, Bioresource technology.

[29]  Hanqing Yu,et al.  Extraction of extracellular polymeric substances from the photosynthetic bacterium Rhodopseudomonas acidophila , 2005, Applied Microbiology and Biotechnology.

[30]  I. Yeom,et al.  Influence of deflocculation on microwave disintegration and anaerobic biodegradability of waste activated sludge. , 2015, Bioresource technology.

[31]  Yaping Zhang,et al.  Effect of K2FeO4/US treatment on textile dyeing sludge disintegration and dewaterability. , 2015, Journal of environmental management.

[32]  S. Qiu,et al.  Ultrasonic irradiation as pretreatment for the reduction of excess sludge by Fenton-acclimation treatment. , 2013, Water science and technology : a journal of the International Association on Water Pollution Research.

[33]  I. Yeom,et al.  Effect of NaCl induced floc disruption on biological disintegration of sludge for enhanced biogas production. , 2015, Bioresource technology.

[34]  J. H. Carey,et al.  AN INTRODUCTION TO ADVANCED OXIDATION PROCESSES (AOP) FOR DESTRUCTION OF ORGANICS IN WASTEWATER , 1992 .

[35]  Yaping Zhang,et al.  Enhanced dewaterability of textile dyeing sludge using micro-electrolysis pretreatment. , 2015, Journal of environmental management.

[36]  K. Hwang,et al.  Effects of reaction conditions on the oxidation efficiency in the Fenton process , 2000 .

[37]  Dionysios D. Dionysiou,et al.  Advanced oxidation processes for water treatment , 2012 .

[38]  Gordon C. C. Yang,et al.  Dewatering of a biological industrial sludge by electrokinetics-assisted filter press , 2011 .

[39]  Rajesh Banu Jeyakumar,et al.  A novel method of sludge pretreatment using the combination of alkalis. , 2012, Journal of environmental biology.

[40]  H. D. Stensel,et al.  Wastewater Engineering: Treatment and Reuse , 2002 .

[41]  S. Kavitha,et al.  Effect of enzyme secreting bacterial pretreatment on enhancement of aerobic digestion potential of waste activated sludge interceded through EDTA. , 2013, Bioresource technology.

[42]  D. Combes,et al.  Effects of commercial enzymes on the adhesion of a marine biofilm-forming bacterium , 2008, Biofouling.