An anaerobic-aerobic sequential batch process with simultaneous methanogenesis and short-cut denitrification for the treatment of marine biofoulings. (April 2018)

• Record Type: Journal Article
• Authors: Akizuki, S.; Toda, T.
• Is Part Of: Waste management. Volume 74(2018)
• Page Start: 168
• Page End: 176
• Publication Date: 2018-04
• Subjects: Multifunctional reactor -- Simultaneous process -- Nitritation -- Organic solid wastes -- Optimization; Hazardous wastes -- Periodicals; Refuse and refuse disposal -- Periodicals; 363.728
• DOI: 10.1016/j.wasman.2017.12.013
• Languages: English
• ISSNs: 0956-053X

Abstract

Highlights: Combined denitritation–methanogenesis was examined to treat intermittent wastes. Achieved high NO2 − accumulation of 96.4% on average in nitritation. Achieved high substrate COD removal of 96% in denitritation–methanogenesis. Intensive effluent exchange enhanced nitrogen removal and decreased CH4 content. Daily effluent exchange of 80% could maintain both effluent and biogas qualities. Abstract: Although combination of denitritation and methanogenesis for wastewater treatment has been widely investigated, an application of this technology to solid waste treatment has been rarely studied. This study investigated an anaerobic-aerobic batch system with simultaneous denitritation-methanogenesis as an effective treatment for marine biofoulings, which is a major source of intermittently discharged organic solid wastes. Preliminary NO2 − -exposed sludge was inoculated to achieve stable methanogenesis process without NO2 − inhibition. Both high NH4 + -N removal of 99.5% and high NO2 − -N accumulation of 96.4% were achieved on average during the nitritation step. Sufficient CH4 recovery of 101 L-CH4 kg-COD −1 was achieved, indicating that the use of NO2 − -exposed sludge is effective to avoid NO2 − inhibition on methanogenesis. Methanogenesis was the main COD utilization pathway when the substrate solubilization occurred actively, while denitritation was the main when solubilization was limited because of substrate shortage. The results showed a high COD removal efficiency of 96.0% and a relatively low nitrogen removal efficiency of 64.4%. Fitting equations were developed to optimize the effluent exchange ratio. The estimated results showed that the increase of effluent exchange ratio during the active solubilization period increased the nitrogen removal efficiency but decreased CH4 content in biogas. An appropriate effluent exchange ratio with high anaerobic effluent quality below approximately 120 mg-N L −1 as well as sufficient CH4 gas quality which can be used as fuel for gas engine generator was achieved by daily effluent exchange of 80% during the first week and 5% during the subsequent 8 days.