Concentration, composition, bioavailability, and N-nitrosodimethylamine formation potential of particulate and dissolved organic nitrogen in wastewater effluents: A comparative study

2016 ◽  
Vol 569-570 ◽  
pp. 1359-1368 ◽  
Author(s):  
Haidong Hu ◽  
Haijun Ma ◽  
Lili Ding ◽  
Jinju Geng ◽  
Ke Xu ◽  
...  
Keyword(s):  
Comparative Study ◽  
Dissolved Organic Nitrogen ◽  
Organic Nitrogen ◽  
Formation Potential ◽  
Wastewater Effluents

scholarly journals NDMA formation potential removal in treated effluent by UV/H2O2 process

2015 ◽  
Vol 6 (1) ◽  
pp. 156-166 ◽  
Author(s):  
Wang Qi ◽  
Hu Jiangyong
Keyword(s):  
Water Reuse ◽  
Dissolved Organic Nitrogen ◽  
Organic Nitrogen ◽  
Ultra Violet ◽  
Treated Wastewater ◽  
Activated Sludge Process ◽  
Formation Potential ◽  
Treated Effluent ◽  
Organic Precursors ◽  
H2o2 System

NDMA formation from treated wastewater is one of the concerns in water reuse. This study focused on NDMA formation potential (NDMAFP) removal in wastewater treated effluent by UV/H2O2 technology. A UV/H2O2 system was tested for the removal performance on both organic precursors and NDMAFP. The system consisted of a low pressure ultra-violet (LPUV) with an intensity of 2 mW/cm2 and a H2O2 dosage of 100 ppm. Reaction time was 60 minutes. Two types of wastewater treated effluents were collected: activated sludge process (ASP) effluent and membrane bio-reactor (MBR) effluent. Results showed efficient dissolved organic carbon (DOC) removal (70%). Dissolved organic nitrogen (DON) removal was less efficient (20–30%). Eighty per cent of NDMAFP in ASP effluent was removed within 1 hour. However, no NDMAFP removal was discovered in MBR effluent. This indicated that the effect of the UV/H2O2 system on NDMAFP removal was water specific. A generation of intermediate NDMA precursors was observed in the ASP effluent. Results indicated that sufficient oxidation should be provided to reduce intermediate NDMA precursors and to achieve NDMAFP removal.

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