Current study results on Environmental Water Research have been published. According to news reporting originating from Shiga, Japan, by VerticalNews correspondents, research stated, "The seasonal and diurnal patterns of N-nitrosomorpholine (NMOR) and its formation potential (NMOR FP) were examined with water samples taken from five outlets of four sewage treatment plants (STPs), seven main stream sites, and five tributary sites in the Yodo River basin. STPs were shown to be the main sources of downstream NMOR load."
Financial supporters for this research include Environmental Restoration and Conservation Agency, Japan Chemical Industry Association, Environment Research and Technology Development Fund.
Our news editors obtained a quote from the research from Kyoto University, "The highest NMOR levels were found in the discharge from one STP (26.4-171 ng/L). Continuous sequential samplings over a period of 24 h at this STP revealed that NMOR flux at the influent point fluctuated in both summer (0.4-3.2 g/h) and winter (0.3-5.4 g/h), while it was steady in the effluent. In addition, levels of NMOR remained stable during the biological treatment and disinfection processes. The present research demonstrated that NMOR could be formed from morpholine (MOR) in raw sewage treated by this STP, with a possible mechanism being formaldehyde-catalyzed nitrosation of MOR by nitrites, prior to raw sewage entering the STP. This implies that the NMOR detected here might not be a disinfection byproduct per se under low-chlorine disinfection (around 1.0 mg/L), but is primarily a contaminant that is difficult to remove during sewage treatment."
According to the news editors, the research concluded: "NMOR attenuated significantly in the rivers in the daytime with production of MOR, but persisted during nights, which demonstrated the importance of monitoring NMOR levels in the water environment during periods of low UV intensity, especially nights."