Pretreatment followed by anaerobic digestion of secondary sludge for reduction of sewage sludge volume

Abe, Naoki; Tang, Youqi; Iwamura, Makoto; Morimura, Shigeru; Kida, Kenji

doi:10.2166/wst.2013.154

Cited by 31 publications

(9 citation statements)

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“…Studies suggested that an excessive concentration of oxygen used in the reaction led to production of recalcitrant soluble organics and toxic compounds and can reduce gas production in anaerobic digestion (Abe et al, 2013). Typically, catalysts will lower reaction temperatures and pressures to be used to achieve the same results as those achieved without catalysts in WAO processes.…”

Section: Wao Treatment Conditionsmentioning

confidence: 99%

A review of wet air oxidation and Thermal Hydrolysis technologies in sludge treatment

Hii

Baroutian

Parthasarathy

et al. 2014

Bioresource Technology

230

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With rapid world population growth and strict environmental regulations, increasingly large volumes of sludge are being produced in today's wastewater treatment plants (WWTP) with limited disposal routes. Sludge treatment has become an essential process in WWTP, representing 50% of operational costs. Sludge destruction and resource recovery technologies are therefore of great ongoing interest. Hydrothermal processing uses unique characteristics of water at elevated temperatures and pressures to deconstruct organic and inorganic components of sludge. It can be broadly categorized into wet oxidation (oxidative) and thermal hydrolysis (non-oxidative). While wet air oxidation (WAO) can be used for the final sludge destruction and also potentially producing industrially useful by-products such as acetic acid, thermal hydrolysis (TH) is mainly used as a pre-treatment method to improve the efficiency of anaerobic digestion. This paper reviews current hydrothermal technologies, roles of wet air oxidation and thermal hydrolysis in sludge treatment, and challenges faced by these technologies.

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Section: Wao Treatment Conditionsmentioning

confidence: 99%

A review of wet air oxidation and Thermal Hydrolysis technologies in sludge treatment

Hii

Baroutian

Parthasarathy

et al. 2014

Bioresource Technology

230

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“…[10] Moreover, WO is also suitable as a pretreatment for sludge anaerobic digestion in order to improve biogas production. [11] This process is particularly appropriate for the treatment of both specific compounds of industrial wastewaters [8,12,13] and sludge treatment. [1,14] Internationally, about 200 wet oxidation full-scale plants operate for the treatment of both sewage sludge and high-strength industrial wastewaters [15,16] process and to study the influence of the specificity of treatment conditions and the effect of the variety of wastes to be treated on process performance.…”

Section: Introductionmentioning

confidence: 99%

Wet Oxidation as an Advanced and Sustainable Technology for Sludge Treatment and Management: Results from Research Activities and Industrial-Scale Experiences

Slavik¹,

Galessi²,

Rapisardi³

et al. 2015

Drying Technology

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In this article, the effectiveness of an advanced sludge treatment technology (Wet Oxidation, WO) is presented by analyzing experimental studies at the lab scale and data collected during years of industrial-scale activities. The data showed good performances of WO on COD and VSS removal efficiencies-about 65-70% and 95-98%, respectively-and the effect of operating parameters (i.e., temperature and reaction time) on process efficiencies was highlighted. The energy balance of the WO systems indicated that about 90% of the energy entering the system may be recovered. Finally, a techno-economic assessment showed that WO can be a suitable solution for sludge treatment and minimization.

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“…Nevertheless, in these cases, WO (usually performed under mild conditions) was proposed as a pre-treatment of anaerobic digestion, aimed at enhancing hydrolysis and, therefore, biogas production (Yang et al 2010;Abe et al 2011Abe et al , 2013Strong et al 2011;Carlsson et al 2012;Strong and Gapes 2012). In the present study, instead, only the liquid residue was submitted to anaerobic digestion, as post-treatment of WO, in order to support the energetic valorization of this by-product.…”

Section: Introductionmentioning

confidence: 99%

“…Actually, many researchers investigated the combined treatment of WO and anaerobic digestion of sewage sludge and biosolids (Genç et al 2002;Kim et al 2003;Abe et al 2011Abe et al , 2013Chen et al 2012;Costa et al 2012). Nevertheless, in these cases, WO (usually performed under mild conditions) was proposed as a pre-treatment of anaerobic digestion, aimed at enhancing hydrolysis and, therefore, biogas production (Yang et al 2010;Abe et al 2011Abe et al , 2013Strong et al 2011;Carlsson et al 2012;Strong and Gapes 2012).…”

Section: Introductionmentioning

confidence: 99%

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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Pretreatment followed by anaerobic digestion of secondary sludge for reduction of sewage sludge volume

Cited by 31 publications

References 0 publications

A review of wet air oxidation and Thermal Hydrolysis technologies in sludge treatment

A review of wet air oxidation and Thermal Hydrolysis technologies in sludge treatment

Wet Oxidation as an Advanced and Sustainable Technology for Sludge Treatment and Management: Results from Research Activities and Industrial-Scale Experiences

Anaerobic treatability of liquid residue from wet oxidation of sewage sludge

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