Integrated expanded granular sludge bed and sequential batch reactor treating beet sugar industrial wastewater and recovering bioenergy

Abstract

The exponential rise in energy demand vis-à-vis depletion of mineral oil resources has accelerated recovery of bioenergy from organic waste. In this study, a laboratory-scale anaerobic (An)/aerobic (Ar) system comprising of expanded granular sludge bed (EGSB) reactor coupled to an aerobic sequential batch reactor (SBR) was constructed to treat beet sugar industrial wastewater (BSIW) of chemical oxygen demand (COD) 1665 mg L while harnessing methane gas. The EGSB reactor generated methane at the rate of 235 mL/g COD added, with considerably higher than previously reported methane content of 86 %. Meanwhile, contaminants were successfully reduced in the combined An/Ar system, realizing a removal rate of more than 71.4, 97.3, 97.7, and 99.3 % of organic matter as total phosphorus, total nitrogen, biological oxygen demand (BOD), and soluble COD, respectively. Microbial community analysis showed that the bacterial genus Clostridium sp. and archaeal genus Methanosaeta sp. dominated the EGSB reactor, while Rhodobacter sp. dominance was observed in the SBR. The obtained experimental results indicate that the integration of expanded granular sludge bed and sequential batch reactor in treating BSIW obtained competitively outstanding performance.

Remediation of Soils Contaminated by Fluoride Using a Fermentation Product of Seaweed (Eucheuma cottonii)

“…e anaerobic biomass converts the insoluble high molecular weight organic compounds (HMWOCs) such as polysaccharides, proteins, and lipids which are the main components in the seaweed into soluble low molecular weight organic compounds (LMWOCs) like monosaccharides, amino acids, and other simple organic compounds which exists as a source of energy and carbon to the other group of microorganisms [16,23]. e simple organic acids produced are further assimilated to produce short-chain organic acids like acetic acid, propionic acids, butyric acids, and alcohols which can either be fatty acids (VFAs), amino acids, or simple sugars as shown in Equations ( 3)- (10) [16,24].…”

Remediation of soils contaminated with fluoride using seaweed-derived materials: case of slopes of mount Meru

“…The properties of interest for dried seaweed (DSW) and fermented seaweed (FSW) for this study are presented by Table 6. During the fermentation process, the anaerobic biomass converts the insoluble high molecular weight organic compounds (HMWOCs) such as polysaccharides, proteins, and lipids which are the main components in the seaweed into soluble low molecular weight organic compounds (LMWOCs) such as monosaccharides, amino acids, and other simple organic compounds which exists as a source of energy and carbon to the other group of micro-organisms (Justo et al, 2016;Plácido & Zhang, 2018). The simple organic acids produced are further assimilated to produce short-chain organic acids like acetic acid, propionic acids, butyric acids, and alcohols which can either be fatty acids (FAs), amino acids, or simple sugars as shown by Equations 20 -25 (Anukam et al, 2019;Plácido & Zhang, 2018).…”