Hydrogen gas production from waste anaerobic sludge by electrohydrolysis: Effects of applied DC voltage

Kargı, Fikret; Çatalkaya, Ebru Çokay; Uzunçar, Sinan

doi:10.1016/j.ijhydene.2010.11.087

Cited by 34 publications

(11 citation statements)

References 29 publications

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“…Energy efficiency increased with time while using water at pH 4 and tap water at pH 6.5 to 8.5; however, the EEf of POME was not subjected to any remarkable increment with respect to time (hours). Kargi et al (2011) reported hydrogen production by using electrolysis of anaerobic sludge with EEf of 74%, but they used serum bottles containing 1 L of sludge. The low EEf values in our study might be due to the large volume of the electrolyte and can be improved by standardizing interelectrode distance, the nature of electrodes, and proper dilution of POME.…”

Section: Resultsmentioning

confidence: 99%

Electrocoagulation of Palm Oil Mill Effluent as Wastewater Treatment and Hydrogen Production Using Electrode Aluminum

et al. 2011

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Palm oil mill effluent (POME) is highly polluting wastewater generated from the palm oil milling process. Palm oil mill effluent was used as an electrolyte without any additive or pretreatment to perform electrocoagulation (EC) using electricity (direct current) ranging from 2 to 4 volts in the presence of aluminum electrodes with a reactor volume of 20 L. The production of hydrogen gas, removal of chemical oxygen demand (COD), and turbidity as a result of electrocoagulation of POME were determined. The results show that EC can reduce the COD and turbidity of POME by 57 and 62%, respectively, in addition to the 42% hydrogen production. Hydrogen production was also helpful to remove the lighter suspended solids toward the surface. The production of Al(OH)XHO at the aluminum electrode (anode) was responsible for the flocculation-coagulation process of suspended solids followed by sedimentation under gravity. The production of hydrogen gas from POME during EC was also compared with hydrogen gas production by electrolysis of tap water at pH 4 and tap water without pH adjustment under the same conditions. The main advantage of this study is to produce hydrogen gas while treating POME with EC to reduce COD and turbidity effectively.

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Section: Resultsmentioning

confidence: 99%

Electrocoagulation of Palm Oil Mill Effluent as Wastewater Treatment and Hydrogen Production Using Electrode Aluminum

et al. 2011

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“…35 from sludge digestion in a MEC at 2 V with only 75% of the highest energy efficiency. 38 Compared with the energy and environmental benefits, Fe loss was unlikely a problem. After the digestion, 6.18 g of Fe loss was found at 0.6 V (Table 4).…”

Section: Significances Of This Workmentioning

confidence: 99%

Enhancement of sludge decomposition and hydrogen production from waste activated sludge in a microbial electrolysis cell with cheap electrodes

Feng

Liu

Zhang

2015

Environ. Sci.: Water Res. Technol.

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Low hydrogen production from anaerobic digestion of sludge has greatly limited the application of biological hydrogen-producing technology. An Fe/graphite electrode was installed into an anaerobic digester to enhance the hydrogen production from waste sludge in this study. The electrode accelerated the decomposition of the sludge, and the production of short-chain fatty acids was 3.5 folds of that in a control anaerobic reactor with no electrode. The hydrogen production was 90.6 mL g VSS −1, while it was almost undetectable in the control. The results suggested that the hydrogen was produced from the cathodic reduction of H + coupling with the anodic oxidation of sludge. The excessive consumption of the cathodic H + drove the pH up to 9.2-9.5 in the electric-anaerobic system which inevitably inhibited the occurrence of methanogenesis. This led to quite low methane production in this electric-anaerobic system. The microbial analysis showed that exoelectrogens were enriched in the presence of an Fe electrode. It catalyzed the anodic oxidation of the sludge to produce more electrons for the cathodic hydrogen production. Raising the voltage supply boosted the H 2 production, but the net energy output was obtained at 0.3 and 0.6 V.

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“…In literature; there are only two studies about electrohydrolysis of OMW (Adhoum and Monser [6] and Kargı et al [7,10] so far. In these studies; 46% to 76% of COD and 95% of dark color removal efficiencies were reported.…”

Section: Resultsmentioning

confidence: 99%

“…In literature, there are limited studies about electrohydrolysis of OMW (Adhoum and Monser [6]; Kargı et al [7]; Inan et al [8]). In these studies, different DC voltages and electrode types were tested and desirable COD removal efficiencies (up to 50%) were reported.…”

Section: Introductionmentioning

confidence: 99%

Hydrogen gas production and pollutant removal from olive mill wastewater by electrohydrolysis

Erdem¹,

Bağ²,

Yarımtepe³

et al. 2016

WIT Transactions on Ecology and the Environment

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Olive Mill Wastewater (OMW) is characterized by strong organic content and also by a high number of inhibitory/complex compounds such as phenolic ones. An effective treatment method has not been sufficiently defined for the wastewater, so far. Therefore, the treatment of OMW is a major concern for manufacturers in Mediterranean countries. There is a growing interest for the application of alternative treatment methods. In this study, OMW was subjected to 10 V DC voltage for hydrogen gas production and COD, sCOD, total solids and total suspended solids, turbidity and color removal. Application of electrohydrolysis at 10 V DC for six hours; 1500±50 ml gas was produced and hydrogen content of gas (88%) was obtained. After 24 hours of settling, COD, sCOD, turbidity, TS, TSS and color removal efficiencies were determined as 75%, 56%, 93%, 61%, 94% and 92% in supernatant, respectively.

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Hydrogen gas production from waste anaerobic sludge by electrohydrolysis: Effects of applied DC voltage

Cited by 34 publications

References 29 publications

Electrocoagulation of Palm Oil Mill Effluent as Wastewater Treatment and Hydrogen Production Using Electrode Aluminum

Electrocoagulation of Palm Oil Mill Effluent as Wastewater Treatment and Hydrogen Production Using Electrode Aluminum

Enhancement of sludge decomposition and hydrogen production from waste activated sludge in a microbial electrolysis cell with cheap electrodes

Hydrogen gas production and pollutant removal from olive mill wastewater by electrohydrolysis

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