Wet air oxidation as a pretreatment option for selective biodegradability enhancement and biogas generation potential from complex effluent

Padoley, K.V.; Tembhekar, P.D.; Saratchandra, T.; Pandit, Aniruddha B.; Pandey, R.A.; Mudliar, Sandeep N.

doi:10.1016/j.biortech.2012.06.051

Cited by 43 publications

(15 citation statements)

References 21 publications

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“…Results indicated that the ozone pretreatment led to COD reduction of up to 33%, along with BI (BOD 3 /COD) enhancement of up to 0.58 from an initial value of 0.15 (ozone consumption 0.41 g per g COD reduced). Padoley et al (2012) reported BI enhancement of up to 0.8 from 0.17 by Wet Air Oxidation pretreatment of biomethanated distillery effluent. Srivastava et al (2006) has reported higher COD removal via subsequent aerobic biodegradation in ozone pretreated effluent (87.4%) as compared to untreated effluent (66%).…”

Section: Effect Of Ozone Pretreatment On the Biodegradability Of Distmentioning

confidence: 97%

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Effect of Ozone Pretreatment on Biodegradability Enhancement and Biogas Generation Potential From Biomethanated Distillery Effluent

Gupta¹,

Sharma²,

Saratchandra³

et al. 2015

Ozone: Science & Engineering

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The study evaluates the effect of ozone pretreatment on biodegradability enhancement of biomethanated distillery effluent. Results revealed that ozone pretreatment led to biodegradability index (BI = BOD/COD) enhancement up to 0.58 along with COD, color and toxicity reduction of up to 33%, 25% and 40%, respectively. Anaerobic digestion of pretreated effluent resulted in favorable biogas generation with methane content, yield and COD reduction of up to 62%, 39 mL/g COD and 57%, respectively. Kinetics of biogas generation determined by modified Gompertz model indicated methane production potential and production rate of 48.08 mL/g COD and 8.085 mL/g COD.day respectively under optimal conditions.

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Section: Effect Of Ozone Pretreatment On the Biodegradability Of Distmentioning

confidence: 97%

“…Biodegradability is a complementary parameter for evaluating the amenability of a waste towards aerobic/anaerobic degradation, which is expressed as the ratio of BOD 3 : COD (Padoley et al 2012). The biodegradability of pretreated effluent was evaluated and compared with the results of untreated effluent.…”

Section: Biodegradability Of Ozone-pretreated Effluentmentioning

confidence: 99%

Effect of Ozone Pretreatment on Biodegradability Enhancement and Biogas Generation Potential From Biomethanated Distillery Effluent

Gupta¹,

Sharma²,

Saratchandra³

et al. 2015

Ozone: Science & Engineering

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“…Within this project, wet oxidation (WO) is proposed for a drastic reduction of the volume of sewage sludge to be disposed, obtained by extremely reducing the volatile sludge content. WO has been applied for almost 100 years for the treatment of both sewage sludge and high strength industrial wastewaters (Strehlenert 1911;Zimmermann 1958;Ploos Van Amstel 1971;Ploos Van Amstel and Rietema 1973;Devlin and Harris 1984;Seiler 1987;Foussard et al 1989;Joglekar et al 1991;Mishra et al 1995;Debellefontaine et al 1996;Duprez et al 1996;Schmidt and Thomsen 1998;Debellefontaine et al 1999;Khan et al 1999;Luck 1999;Zerva et al 2003), and in recent years, a renewed interest in WO of sewage sludge has emerged, as confirmed by the number of recent publications (Pérez-Elvira et al 2006;Jaroslaw and Roman 2008;Yang et al 2010;Abe et al 2011;Gielen et al 2011;Strong et al 2011;Padoley et al 2012;Strong and Gapes 2012;Baroutian et al 2013).…”

Section: Introductionmentioning

confidence: 76%

Techno-economic and environmental assessment of sewage sludge wet oxidation

Bertanza

Canato

Heimersson

et al. 2014

Environ Sci Pollut Res

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Today, several technologies and management strategies are proposed and applied in wastewater treatment plants (WWTPs) to minimise sludge production and contamination. In order to avoid a shifting of burdens between different areas, their techno-economic and environmental performance has to be carefully evaluated. Wet oxidation (WO) is an alternative solution to incineration for recovering energy in sewage sludge while converting it to mostly inorganic residues. This paper deals with an experimentation carried out within the EU project "ROUTES". A mass balance was made for a WWTP (500,000 person equivalents) in which a WO stage for sludge minimisation was considered to be installed. Both bench- and full-scale test results were used. Design of treatment units and estimation of capital and operational costs were then performed. Subsequently, technical and economic aspects were evaluated by means of a detailed methodology which was developed within the ROUTES project. Finally, an assessment of environmental impacts from a life cycle perspective was performed. The integrated assessment showed that for the specific upgrade considered in this study, WO technology, although requiring a certain increase of technical complexity at the WWTP, may contribute to environmental and economic advantages. The paper provides guidance in terms of which aspects need a more thorough evaluation in relation to the specific case in which an upgrade with WO is considered.

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“…In recent years, a renewed interest in WO of sewage sludge emerged, as confirmed by the number of publications (Pérez-Elvira et al 2006;Mucha and Zarzycki 2008;Yang et al 2010;Abe et al 2011;Gielen et al 2011;Strong et al 2011;Padoley et al 2012;Strong and Gapes 2012;Baroutian et al 2013). In fact, sludge treatment and disposal pose a challenge for Waste Water Treatment Plants (WWTPs): about 50 % of the total operating costs may be represented by sludge handling (Weemaes and Verstraete 1998;Liu and Tay 2001;Neyens et al 2004;Mahmood and Elliott 2006;Appels et al 2008;Saveyn et al 2008;Ruiz-Hernando et al 2010).…”

Section: Introductionmentioning

confidence: 92%

Anaerobic treatability of liquid residue from wet oxidation of sewage sludge

Bertanza

Galessi²,

Menoni

et al. 2014

Environ Sci Pollut Res

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Wet Oxidation (WO) of sewage sludge is a chemical oxidation of sludge at high temperatures and pressures by means of an oxygen-containing gas. The liquid stream originated by WO is easily biodegradable, and therefore, the recirculation to the biological Waste Water Treatment Plant (WWTP) may be a feasible solution. However, the WO effluent has a residual organic and nitrogen content so that its treatment may be required when the receiving WWTP has no surplus treatment capacity left. The aim of this research was the assessment of the anaerobic treatability of the WO liquid residue, in order to reduce the organic load to be recirculated to the WWTP, simultaneously promoting energy recovery. For this purpose, the liquid residue obtained during full scale WO tests on two different types of sludge was submitted to anaerobic digestion in a continuous flow pilot reactor (V = 5 L). Furthermore, batch tests were carried out in order to evaluate possible inhibition factors. Experimental results showed that, after the start-up/acclimation period (~130 days), Chemical Oxygen Demand (COD) removal efficiency was stably around 60% for about 120 days, despite the change in operating conditions. In the last phase of the experimental activity, COD removal reached 70% under the following treatment conditions: Hydraulic Retention Time (HRT) = 20 days, Volumetric Organic Loading Rate (VOLR) = 0.868 kg COD/m(3)/day, Organic Loading Rate per Volatile Suspended Solids (OLRvss) = 0.078 kg COD/kg VSS/day, temperature (T) = 36.5 °C, pH = 8. Energy balance calculation demonstrated anaerobic treatment sustainability.

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Wet air oxidation as a pretreatment option for selective biodegradability enhancement and biogas generation potential from complex effluent

Cited by 43 publications

References 21 publications

Effect of Ozone Pretreatment on Biodegradability Enhancement and Biogas Generation Potential From Biomethanated Distillery Effluent

Effect of Ozone Pretreatment on Biodegradability Enhancement and Biogas Generation Potential From Biomethanated Distillery Effluent

Techno-economic and environmental assessment of sewage sludge wet oxidation

Anaerobic treatability of liquid residue from wet oxidation of sewage sludge

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