Stabilization and dewatering of wastewater treatment plants sludge using the Fenton process

Abolfazl Azhdarpoor, Zahra Mohammadi, Mansoureh Dehghani

Abstract


Wastewater sludge typically contains large amounts of water and organic materials; therefore, its stabilization and dewatering is of particular importance. In this study, Fenton oxidation process is used for stabilization and dewatering of sludge in the output of a wastewater treatment plant. To evaluate the sludge stabilization and dewatering, specific resistance to filtration (SRF), volatile organic compounds (VSS), total suspended solids (TSS), soluble chemical oxygen demand (SCOD) and heterotrophic bacteria were measured. During the experiment, the optimal values of various parameters such as pH (2-9), hydrogen peroxide (0.015- 0.18mol/L), Fe2+ (0.008- 0.1mol/L) and time (5 - 60 minutes) for optimum sludge dewatering and stabilization were investigated. The results showed that the highest percentages of SRF reduction and removal rates of SCOD, VSS and TSS were 99.48, 61, 42, and 41 percent respectively. These results were obtained in optimum pH 5, 0.05 mol/l Fe2+, 0.12 mol/l hydrogen peroxide, and the retention time of 15 minutes. The removal rate of heterotrophic bacteria increased with increasing dose of hydrogen peroxide, so that a removal rate of 84 percent was observed at a dose of 0.18 mol/l. In general, Fenton process can reduce volatile organic materials and chemical oxygen demand of the sludge resulting in its significant stabilization and dewatering. In general, Fenton process can reduce volatile organic materials and chemical oxygen demand of the sludge resulting in its significant stabilization and dewatering.

Keywords


Sludge, Fenton, stabilization and dewatering, organic materials.

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References


Nielsen S, Bruun EW. Sludge quality after 10–20 years of treatment in reed bed systems. Environ Scie Poll Res. 2014; 22(17): 1-7

Filipović J, Grčić I, Bermanec V, Kniewald G. Monitoring of total metal concentration in sludge samples: Case study for the mechanical–biological wastewater treatment plant in Velika Gorica, Croatia. Scie tot environ. 2013; 447: 17-24

Liu H, Liu P, Hu H, Zhang Q, Wu Z, Yang J, et al. Combined effects of Fenton peroxidation and CaO conditioning on sewage sludge thermal drying. Chemosphere. 2014; 117: 559-66.

Gaspard P, Wiart J, Schwartzbrod J. Parasitological contamination of urban sludge used for agricultural purposes. Waste manage res. 1997; 15(4): 429-36

Ning X-a, Chen H, Wu J, Wang Y, Liu J, Lin M. Effects of ultrasound assisted Fenton treatment on textile dyeing sludge structure and dewaterability. Chem Engin J. 2014; 242: 102-08

Murugesan K, Ravindran B, Selvam A, Kurade MB, Yu S-M, Wong JW. Enhanced dewaterability of anaerobically digested sewage sludge using Acidithiobacillus ferrooxidans culture as sludge conditioner. Biores technol. 2014; 169: 374-79

Liu C, Zhang P, Zeng C, Zeng G, Xu G, Huang Y. Feasibility of bioleaching combined with Fenton oxidation to improve sewage sludge dewaterability. J Environ Scie. 2015; 28: 37-42

Neyens E, Baeyens J. A review of classic Fenton’s peroxidation as an advanced oxidation technique. J Hazard mater. 2003; 98(1): 33-50

Zeng X, Twardowska I, Wei S, Sun L, Wang J, Zhu J, et al. Removal of trace metals and improvement of dredged sediment dewaterability by bioleaching combined with Fenton-like reaction. J hazard mater. 2015; 288: 51-59

Zhang G, Wan T. Sludge Conditioning by Sonication and Sonication-Chemical Methods. Procedia Environ Scie. 2012; 16: 368-77

Buyukkamaci N. Biological sludge conditioning by Fenton’s reagent. Process Biochem. 2004; 39(11): 1503-6

Mo R, Huang S, Dai W, Liang J, Sun S. A rapid Fenton treatment technique for sewage sludge dewatering. Chem Engin J. 2015; 269: 391-98

Tony MA, Zhao Y, Fu J, Tayeb AM. Conditioning of aluminium-based water treatment sludge with Fenton’s reagent: effectiveness and optimising study to improve dewaterability. Chemosphere. 2008; 72(4): 673-77

Peng G, Ye F, Ye Y. Effects of Microwave Irradiation on Dewaterability and Extracellular Polymeric Substances of Waste Activated Sludge. Wat Environ Res. 2013; 85(3): 278-85

Yuan H, Zhu N, Song L. Conditioning of sewage sludge with electrolysis: effectiveness and optimizing study to improve dewaterability. Biores technol. 2010; 101(12): 4285-90

Ye F, Liu X, Li Y. Effects of potassium ferrate on extracellular polymeric substances (EPS) and physicochemical properties of excess activated sludge. J hazard mater. 2012; 199: 158-63

Zhen G-Y, Lu X-Q, Li Y-Y, Zhao Y-C. Innovative combination of electrolysis and Fe (II)-activated persulfate oxidation for improving the dewaterability of waste activated sludge. Biores technol. 2013; 136: 654-63

Malakootian M, Jafari MH, Moosavi S, Daneshpajooh M. Performance Evaluation of fenton process to remove choromium, COD and turbidity from electroplating industry wastewater. water waste. 2013; 24(2):2-10

Kaynak GE, Filibeli A. Assessment of Fenton process as a minimization technique for biological sludge: effects on anaerobic sludge bioprocessing. J Resids Scie Technol. 2008; 5(3): 151-60

Erden G, Filibeli A. Improving anaerobic biodegradability of biological sludges by Fenton pre-treatment: Effects on single stage and two-stage anaerobic digestion. Desal. 2010; 251(1): 58-63

Zhen G, Lu X, Wang B, Zhao Y, Chai X, Niu D, et al. Enhanced dewatering characteristics of waste activated sludge with Fenton pretreatment: effectiveness and statistical optimization. Frontiers Environ Scie Engin. 2014; 8(2): 267-76

APHA. Standard Methods for the Examination of Water andWastewater, 20th ed. Washington, DC, USA: American Public Health Association Inc1998

Lu M-C, Lin C-J, Liao C-H, Huang R-Y, Ting W-P. Dewatering of activated sludge by Fenton's reagent. Advances Environ Res. 2003; 7(3): 667-70

Wang C-T, Chou W-L, Chung M-H, Kuo Y-M. COD removal from real dyeing wastewater by electro-Fenton technology using an activated carbon fiber cathode. Desal. 2010; 253(1): 129-34

Shemer H, Linden KG. Degradation and by-product formation of diazinon in water during UV and UV/H 2 O 2 treatment. J hazard mater. 2006; 136(3): 553-9

Rodrigues CS, Madeira LM, Boaventura RA. Optimization of the azo dye Procion Red H-EXL degradation by Fenton's reagent using experimental design. J Hazard Mater. 2009; 164(2): 987-94

Wenyuan H, Haizheng Y, Guowei G. Acid treatment of waste activated sludge for better dewaterability J Environ Poll Control. 2006;28( 9): 680-82

Lu M, Lin C, Liao C, Ting W, Huang R. Influence of pH on the dewatering of activated sludge by Fenton's reagent. Water Scie Technol. 2001; 44(10) :327-32

Zorpas AA, Costa CN. Combination of Fenton oxidation and composting for the treatment of the olive solid residue and the olive mile wastewater from the olive oil industry in Cyprus. Biores technol. 2010; 101(20): 7984-7

Neyens E, Baeyens J, Dewil R. Advanced sludge treatment affects extracellular polymeric substances to improve activated sludge dewatering. J Hazar Mater. 2004; 106(2): 83-92

Muruganandham M, Swaminathan M. Decolourisation of Reactive Orange 4 by Fenton and photo-Fenton oxidation technology. Dyes Pigments. 2004; 63(3): 315-21

Jiang J, Gong C, Tian S, Yang S, Zhang Y. Impact of ultrasonic treatment on dewaterability of sludge during Fenton oxidation. Environm monitoring assess. 2014; 186(12) : 81-88

Kim D-H, Jeong E, Oh S-E, Shin H-S. Combined (alkaline+ ultrasonic) pretreatment effect on sewage sludge disintegration. Water res. 2010; 44(10): 3093-00

DĘBOWSKI M, Krzemieniewski M. The influence of Fenton’s reagent on the raw sludge disinfection. Environ Protect Engin. 2007; 33(1): 65-76

Gulkaya I, Surucu GA, Dilek FB. Importance of H 2 O 2/Fe 2+ ratio in Fenton's treatment of a carpet dyeing wastewater. J Hazard Mater. 2006; 136(3): 763-69

Miretzky P, Muñoz C. Enhanced metal removal from aqueous solution by Fenton activated macrophyte biomass. Desal. 2011; 271(1): 20-28

Sankara Narayanan T, Magesh G, Rajendran N. Degradation of O-chlorophenol from aqueous solution by electro-Fenton process. Fres Environ Bulletin. 2003; 12(7): 776-80




Iranian Journal of Health, Safety and Environment e-ISSN: :2345-5535 Iran university of Medical sciences, Tehran, Iran