Details

Autor(en) / Beteiligte

• Linji, Xu
• Wenzong, Liu
• Yining, Wu
• Aijie, Wang
• Shuai, Li
• Wei, Ji

Titel

Optimizing external voltage for enhanced energy recovery from sludge fermentation liquid in microbial electrolysis cell

Ist Teil von

• International journal of hydrogen energy, 2013-11, Vol.38 (35), p.15801-15806

Ort / Verlag

Kidlington: Elsevier Ltd

Erscheinungsjahr

2013

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Waste activated sludge (WAS), which is rich in organic substances, provides an energy resource. To recover hydrogen from the organic wastes, microbial electrolysis cell may be used as an efficient device. Since different extra applied voltages have significant effects on the efficiency of microbial electrolysis cell, this paper explores different extra applied voltages (0.6 V–1.2 V) affecting the utilization of sludge fermentation liquid (SFL) that is treated with synchronous double-frequency (28 + 40 kHz) and alkali coupling 72-bacth mesothermal anaerobic fermentation (35 °C). It is found that 0.8 V was the optimum extra applied voltage. With this voltage, the highest energy recovery efficiency will be 169 ± 1% and the peak of soluble chemical oxygen demand (SCOD) removal efficiency can be found at 51.4 ± 0.6%; Coulombic efficiency is 98.9 ± 1.0%. The order of complex matter consumption is found to be HAc > HPr > nHBu > nHVa > total carbohydrates > protein. The processing methods of synchronous double-frequency, alkaline, coupling with anaerobic fermentation are feasible for microbial electrolysis cell to transform large amount of waste activated sludge into energy. •Double-frequency synchronous, alkali and anaerobic fermentation increased SFL accumulation.•H2, CO2 and CH4 production of MEC with different extra voltages (0.6–1.2 V) have been analyzed.•We evaluated energy efficiency and coulombic efficiency of MEC with different extra voltages.•The utilizing rule of complex substances in SFL was HAc > HPr > nHBu > nHVa > TC > protein.•The optimum extra applying voltage of MEC is found to be 0.8 V.