Achieving partial denitrification with sludge fermentation liquid as carbon source: The effect of seeding sludge

Effect of fermentation liquid from food waste as a carbon source for enhancing denitrification in wastewater treatment

“…The synthetic wastewater supplied in the study, containing nutrient and trace element solutions, was prepared for the denitrifying sludge following the methods proposed by Cao et al (2013). The initial nitrate concentration was maintained at approximately 50 mg/L using 5 M NaNO 3 solution, and the COD/NO 3 À -N ratio at around 8 with corresponding three carbon sources (FLFW, glucose, and sodium acetate) (Ge et al, 2012).…”

Impact of carbon source and COD/N on the concurrent operation of partial denitrification and anammox

“…Waki, Yasuda, Fukumoto, Kuroda, and Suzuki () performed 24‐hr batch tests evaluating the impacts of organic (acetate) and inorganic (hydrogen) electron donors on DEAMOX process using acclimated sludge sequencing batch reactor (SBR) operations using DEAMOX concept under acetate and ethanol addition were reported with total nitrogen removal efficiency of 95% under mainstream conditions (Du et al., ). The seeding sludge in this study however was taken from an enriched PdN system (Cao et al., ), then mixed with anammox biomass derived from upflow anaerobic sludge blanket (UASB). So far it is thus unclear how one selects for partial denitrification starting from the conventional full denitrification systems to gradually shift toward partial denitrification–anammox.…”

Waste activated sludge fermentation liquid as carbon source for biological treatment of sulfide and nitrate in microaerobic conditions

“…As a result, the cost of simultaneous flue gas desulfurization and denitrification operation also become higher. Therefore, a number of studies have been carried out on denitrification with waste water containing organic acids as substrate [20]. A treatment process based on waste carbon sources is the requirement of the day, instead of the noble ones.…”

“…Furthermore, using the product from fermentation of primary sludge mixed with WAS as the external carbon source has been proven to drive biological nitrogen removal [20], and its specific denitrification rate was greater than that with the addition of acetic or propionic acid as sole carbon source [23]. Moreover, the generation of nitrous oxide (N 2 O) and nitric oxide, typical greenhouse gases, could be reduced efficiently and significantly in municipal wastewater treatment under low dissolved oxygen conditions with sludge fermentation liquid as feedstock [24].…”