Effect of Short‐term Exposure of Selected Aromatic Nitrogen Compounds on Wastewater Treatment

Abstract

The biodegradation of melamine and p-nitrophenol (PNP) and their impact on wastewater treatment was evaluated after a short-term individual chemical loading in activated sludge treatment systems. Melamine was not degraded and quickly washed out of the system. PNP was degraded, but it led to a prolonged period of nitrification inhibition and deterioration of effluent quality. Both melamine and PNP loadings increased the effluent nitrogen concentrations, with their main contributors being melamine and NH 4 þ , respectively. Nitrosomonas and Nitrospira were dominant in the activated sludge. Melamine did not affect the nitrifying assemblages, whereas PNP led to a reduced Nitrosomonas population size and complete washout of Nitrobacter. The results suggest that melamine is an inert compound if it enters the treatment facility for a short duration. Although the short-term exposure of melamine or PNP decreased effluent water quality, the impact of such aromatic nitrogen compounds on wastewater treatment performance may vary significantly. Water Environ. Res., 86, 2166Res., 86, (2014.

Effect of the Oxidative Phosphorylation Uncoupler Para-Nitrophenol on the Activated Sludge Community Structure and Performance of a Submerged Membrane Bioreactor

“…Zuriaga-Agustí et al [10] also demonstrated that low pNP concentration (25 mg/L) had no adverse effect on activated sludge process, whereas 125 mg/L pNP decreased sludge's activity by 29%. Guo et al [19] reported that addition of pNP as metabolic uncoupler could be easily degraded at reasonable concentrations, although even a small amount of such uncoupler can reduce biomass production. Moreover, Inglezakis et al [20] stated that 8.5 mg/L pNP resulted in low oxygen uptake rate inhibition (<20%).…”

Contribution of ammonia oxidizing microorganisms and effect of paranitrophenol onammonia oxidation of nitrifying sludge

“…Thus far, a few enriched cultures have been available for some branches of Thaumacheota, for example Nitrosopumilus For wastewater treatment plant (WWTP) field of study, AOA was found for the first time in activated sludge bioreactors in the USA by Park et al (2006). During 2006-2017, AOA was found in WWTPs in many worldwide countries; for example, the USA (Wells et al 2009) Hong Kong (Jin et al 2010;Ye and Zhang 2011;Zhang et al 2009) Thailand (Limpiyakorn et al 2011;Sonthiphand and Limpiyakorn 2011),Turkey (Yapsakli et al 2011), China (Bai et al 2012;Gao et al 2013;Guo et al 2014;Zhang et al 2009;Zhang et al 2015), Singapore (Zhang et al 2009) (Sauder et al 2017;Shen et al 2013;Tourna et al 2011). Some compounds act as a scavenger of nitric oxide (NO) such as 2-phenyl-4, 4, 5, 5-tetramethylimidazoline-1-oxyl 3-oxide (PTIO) (Shen et al 2013).…”

“…Since, PNP has been reported as priority pollutant by United States Environmental Protection Agency ( USEPA) . PNP is able to cause teratogenic, carcinogenic, and mutagenic to organisms (Guo et al 2014). Therefore, U.S.EPA listed PNP as a considering pollutant and restricted the concentration of PNP in natural water to be less than 10 ngL -1 .…”

“…9 and 69. 5 mg PNP kg -1 soil Guo et al ( 2014). studied short-term effect of nitrophenol on WWTPs sludge enriched for more than 200 days.…”

“…5 mg PNP kg -1 soil. In 2014,Guo et al ( 2014) studied short-term effect of nitrophenol on WWTS sludge enriched for more than 200 days. The impact of exposure was tested by adding PNP only one time.…”