Paperboard mill wastewater treatment via combined dark and LED-mediated fermentation in the absence of external chemical addition. (January 2020)

• Record Type: Journal Article
• Authors: Elsharkawy, Khaled; Gar Alalm, Mohamed; Fujii, Manabu; Afify, Hafez; Tawfik, Ahmed; Elsamadony, Mohamed
• Is Part Of: Bioresource technology. Volume 295(2020)
• Publication Date: 2020-01
• Subjects: PMWW Paperboard mill wastewater -- UISTRs Up-flow intermitted stirring tank reactors -- HRTs Hydraulic retention times -- SDE Substrate removal efficiency -- DF Dark fermentation -- PF Photo-fermentation -- PNSB Purple non-sulfur bacteria -- HY H2 yield -- VFAs Volatile fatty acids -- OLRs Organic loading rates -- LED Light-emitting diodes -- COD Chemical oxygen demand -- HPB H2 producing bacteria -- VSS Volatile suspended solid -- LCE Light conversion efficiency -- FA Free ammonia -- TA Total ammonia -- TSS Total suspended solids -- BOD Biochemical oxygen demand -- TKj-N Total kjeldahl nitrogen -- HPLC High performance liquid chromatography -- HAc Acetate -- HBu Butyrate -- HPr Propionate -- HLa Lactate -- EtOH Ethanol -- ANOVA Analysis of variance -- NADH Nicotinamide adenine dinucleotide -- HP H2 productivity -- HC H2 content -- MPB Methane producing bacteria -- BGR Bacterial growth rate -- NGE Net gain energy; Paperboard mill wastewater -- Hydrogen production -- Dark fermentation -- Photo fermentation; Biomass -- Periodicals; Biomass energy -- Periodicals; Bioremediation -- Periodicals; Agricultural wastes -- Periodicals; Factory and trade waste -- Periodicals; Organic wastes -- Periodicals; Bioénergie -- Périodiques; Déchets agricoles -- Périodiques; Déchets industriels -- Périodiques; Déchets organiques -- Périodiques; Déchets (Combustible) -- Périodiques; 662.88
• DOI: 10.1016/j.biortech.2019.122312
• Languages: English
• ISSNs: 0960-8524

Abstract

Graphical abstract: Highlights: Long HRT for dark fermentation process accounted for higher CO2 production. Proposed light configuration led to light conversion efficiency augmentation to 5.9%. Optimum overall performance was acquired at HRT of 12 h with HP of 1394.1 mL/L/d. Growth rate of photosynthetic bacteria was higher than dark fermentative bacteria. Abstract: Paperboard mill wastewater (PMWW) was treated using two subsequent dark and photo up-flow intermitted stirring tank reactors (UISTRs) under different hydraulic retention times (HRTs) without external chemical use. HRT of 12 h revealed the maximum overall H2 productivity of 1394.1(±70.6) mL/L/d with contents of 48.9(±2.5) and 47.4(±1.4)% for dark- and photo-processes, respectively. Overall substrate removal efficiency (SDE) of 58.9(±4.5)% was registered at HRT o 12 h. High H2 productivity was ascribed to fermentation type occurred at dark reactor, since acetate and butyrate accounted for 70.9% of volatile fatty acids. Besides, pH and carbon to nitrogen ratio of dark reactor's effluent at HRT = 12 h were 5.5(±0.1) and 30.0(±2.5), respectively which are the optimum levels for photo fermentation process. Moreover, energetic and economic analyses emphasized on the superiority of 12 h-HRT, where net gain energy, daily saving and payback period accounted for 1319.5 kWh/d, 148.7 $/d and 9.8 years, respectively.