Enhanced Lipid Degradation in an Upflow Anaerobic Sludge Blanket Reactor by Integration with an Acidogenic Reactor

Abstract

This work was conducted to investigate the lipids inhibition and their degradation in dairy wastewater treatment. Two-phase system, composed of an acidogenic continuously stirred tank reactor (CSTR) and an upflow anaerobic sludge blanket (UASB) reactor was compared with a single phase system, conventional UASB reactor. The systems were operated up to organic loading rate of 8.09 g COD/L/d and lipid loading rate of 2.94 g COD/L/d. The twophase systems showed higher COD removal (1.19 times), lipids removal (1.92 times) and CH 4 production (1.42 times) than the single-phase system. Degradation of lipids and saturation of the double-bonded lipids in the CSTR led to the enhanced system performance. However, the CSTR performance decreased at the acidogenic HRT below 0.27 d owing to insufficient biomass retention. In serum bottle tests at different lipids concentration, high lipids concentration resulted in long lag-phase time for CH 4 production. However, 69.5% of TCOD was eventually converted to CH 4 within 50 days, even at the highest lipids concentration (6.1 g COD/L). It meant that the lipids inhibition was not bacteriocidal but reversible.

A Review on Anaerobic Co-Digestion with a Focus on the Microbial Populations and the Effect of Multi-Stage Digester Configuration

“…Although the advantages of two-stage over single-stage digestion systems are addressed in the literature [119,[124][125][126][127][128], there is a lack of adequate research available in terms of comparison between the performances of single, two, or multi-phase co-digestion systems. Kim et al [129] developed a two-stage system comprised of a continuously stirred tank reactor for acidogenesis and a methanogenic upflow bed reactor for the treatment of a high lipid wastewater from a milk and ice cream factory, co-digested with slaughter house wastewater. They obtained a 1.2-times increase in the COD removal, 1.9-times increase in lipids removal, and 1.4-times increase in the methane production compared to the single phase system.…”

Anaerobic digestion of slaughterhouse waste: Main process limitations and microbial community interactions

“…Some slaughterhouse wastewater treatment plants (WWTP) have a secondary anaerobic reactor, usually based on upflow anaerobic sludge blanket (UASB) or expanded granular sludge bed (EGSB) reactor systems, due to the high organic content of the intake. Several successful experiments at laboratory, pilot and industrial scale with such wastewater and reactor configurations are reported in the literature (Kim and Shin, 2010).…”

Dairy Wastewater Treatment through Synergies of the Biological and Hybrid Membrane: A Systematic Review

“…Meanwhile, the UASB is the most effective treatment technology for soluble contaminants. A COD reduction of 77%, a BOD reduction of 87%, a TSS reduction of 47.1%, a TDS reduction of 57%, an oil and grease reduction of 92%, and a chloride reduction of 49.8% are the effluent removal rates for UASB from dairy wastewater (Kim and Shin, 2010;Gotmare et al, 2011;Passeggi et al, 2012;Uma, 2012, 2013;Chen et al, 2014;Couras et al, 2015;Elangovan and Sekar, 2015;Banu et al, 2015;Lavanya and Jodhi, 2016;Picos-Benítez et al, 2017;Batubara et al, 2018;Zhuang et al, 2018;Gundkal et al, 2019;Heydari et al, 2019;Jin et al, 2019;Yang et al, 2019;Lim et al, 2020;Mainardis et al, 2020).…”