The stimulating effects of the addition of glucose on denitrification and removal of recalcitrant organic compounds

Abstract

-A laboratory scale aerobic oxidation ditch combined with an anoxic reactor was conducted to treat wastewater from a chemical industrial park in Tianjin, China. The wastewater exhibited a low biodegradability, and the results of gas chromatography mass spectrometry (GC-MS) analysis showed that some recalcitrant organic components are present in the wastewater. Ammonia nitrogen (NH 4 + -N) removal efficiency of over 90% was obtained. However, the removal efficiencies of total nitrogen (TN) and chemical oxygen demand (COD) were below 16% and 15%, respectively. The addition of glucose to the anoxic reactor in the system increased the removal efficiencies of TN and COD to approximately 72% and 25.57%, respectively. Results of mass balance indicate that about 60% of the external carbon was consumed as electron donor for denitrification, while 40% was consumed as a substrate for co-metabolism. The optimal dose of added glucose was also investigated, which was determined at 0.35 to 1.20 (COD glucose :COD original ).

UASB reactor startup for the treatment of municipal wastewater followed by advanced oxidation process

“…Glucose served as a better carbon source for active biomass, which was easily biodegradable to form acetate. Therefore, the removal percentage of COD during the first five days of feeding with glucose were lower than 70%, but from the 6 th day, as microbial growth increased, the removal efficiency increased to 80% (Figure 3), in accordance with the finding of Wang et al (2014), who found that when glucose was added to the anaerobic reactor from day 105 to day 138, the total COD removal rate was increased from 23.93% to 85.71%. In order to check the reactor efficiency, effluent COD was compared with influent COD.…”

Influence of oxygen on the vinyl acetate elimination pathway and microbial community structure of methanogenic sludge

“…However, no significant changes were observed in the band pattern while Methanosarcina genus remained after DO addition, proving that DO did non‐significantly affect Archaea populations as it has been reported by other authors (Durán et al, 2008; Ergüder & Demirer, 2005). There are reports about toxic compounds biological elimination is carried out through cometabolic pathways were the oxygen improves the acrylates, pentachlorophenol, styrene trichlorophenol, and VA methanogenesis (Garibay‐Orijel et al, 2005; Wang et al, 2014). Besides, the 2 mg DO·L −1 addition is reported as not toxic for sludge's and the oxygen removed several toxic compounds, which were not previously eliminated under anaerobic conditions.…”

“…There is evidence that glucose represent a strong supporter, because it makes microorganisms grew and induces enzymes and cofactors required for cometabolism (Li et al, 2014;Tobajas et al, 2012). In addition to the fact, since glucose is a positive effector over methanogenesis recalcitrant chemicals such as acrylates, styrene, vinyl acetate, trichlorophenol, and pentachlorophenol, it provides the greatest electron flow (Dur an et al, 2008(Dur an et al, , 2011Garibay-Orijel et al, 2006;Wang et al, 2014). However, there is not enough evidence in order to understand the carbon sources action such as glucose over the toxic compound's biological degradation through cometabolic pathways.…”

Cometabolic bacterial and fungal remediation as a promising strategy for recycled paper and cardboard mill wastewater treatment

“…Additional carbon sources (e.g. glucose) can provide a synergistic effect, improving bacterial and fungal growth and enhancing the treatment efficiency of pulp and paper wastewater (Raj et al , 2014; Wang et al , 2014). In fact, without the assistance of co-metabolic substrates, it would take more time for microorganisms to degrade organic matter due to the inhibition of microbial function caused by the calcitrant and toxic organics presented in wastewater (Li et al , 2021).…”