Wet oxidation of activated sludge

Khan, Y; Anderson, G. K.; Elliott, David J.

doi:10.1016/s0043-1354(98)00387-x

Cited by 45 publications

(18 citation statements)

References 7 publications

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“…Kinetic studies of the wet oxidation process cover mainly wet oxidation of sewage sludge from municipal wastewater treatment plants [4][5][6][7] and harmful and toxic organic compounds [8,9]. For this type of processes several kinetic models were proposed and their quality was evaluated experimentally [10].…”

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confidence: 99%

Wet Oxidation of Dairy Sewage

Piotrowska¹,

Imbierowicz²,

Chacuk³

2012

Ecological Chemistry and Engineering S

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Abstract:Results of kinetic studies on the process of wet oxidation of dairy sewage are presented. Experiments were carried out in a stirred batch tank reactor at the oxygen partial pressure equal to 1 MPa and at temperature ranging from 473 to 523 K. Dairy sewage was subjected to oxidation at a natural pH close to 4. The efficiency of decomposition of organic compounds was estimated on the basis of TOC measurement. The highest TOC reduction rate reached 79.6%. A kinetic model of the process was proposed and its parameters were determined experimentally. Good agreement of the experimental and calculated results was obtained.

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confidence: 99%

Wet Oxidation of Dairy Sewage

Piotrowska¹,

Imbierowicz²,

Chacuk³

2012

Ecological Chemistry and Engineering S

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“…The Wet Oxidation (WO) technology has been proposed since 100 years for the treatment of both sewage sludge and highstrength industrial wastewaters: during the process, organic and biologically refractory compounds are converted into CO 2 , water, and simpler and easily treatable materials, with a significant reduction in toxicity and chemical oxygen demand (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 1996Debellefontaine et al , 1999Duprez et al 1996;Schmidt and Thomsen 1998;Khan et al 1999;Luck 1999;Zerva et al 2003). A research by Roy et al (2010) recorded the presence of 200 WO full scale plants operating around the world for the treatment of high-strength industrial wastewaters.…”

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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“…But WAO can also be considered as a destructive process: with hard temperature and pressure conditions (between 260°C and 350°C, and higher than 7 MPa), the organic matter can be completely oxidized leading to a substantial volume reduction of the solid part and consequently to an important decrease of disposal costs [8][9][10]. Few studies have dealt with the oxidation of activated sludge in that temperature range and, to our knowledge, no-one has tried to optimize the degradation yield [11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Optimization of the degradation of sewage sludge by wet air oxidation. Study of the reaction mechanism on a cellulose model compound

2000

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Abstract. The aim of this work is to optimize the degradation yield of an activated sludge and to study the reaction mechanism on a cellulose model compound. This optimization is performed with a Simplex design with four parameters: reaction temperature (280-350°C), injected air pressure (40-60 MPa), reaction time (10-45 minutes) and COD concentration (0.5-5 g L -1 ). The better yield obtained on TOC concentration is 82 5% at 330°C. Over this temperature, the yield substantially decreases. The use of cellulose as a model compound for activated sludge confirms optimization results and leads to the identification of by-products and free radical species participating in the reaction. Two major organic compounds have been detected: 4-oxo pentanoïc acid and 3-oxo butanoïc acid, and three types of radicals: HO°, CO 2°-and °CH(OH)CH 3 .

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Wet oxidation of activated sludge

Cited by 45 publications

References 7 publications

Wet Oxidation of Dairy Sewage

Wet Oxidation of Dairy Sewage

Anaerobic treatability of liquid residue from wet oxidation of sewage sludge

Optimization of the degradation of sewage sludge by wet air oxidation. Study of the reaction mechanism on a cellulose model compound

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