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.

Impact of solids retention time on dissolved organic nitrogen and its biodegradability in treated wastewater

2016 ◽  
Vol 92 ◽  
pp. 44-51 ◽  
Author(s):  
Halis Simsek ◽  
Murthy Kasi ◽  
Jae-Bom Ohm ◽  
Sudhir Murthy ◽  
Eakalak Khan
Keyword(s):  
Retention Time ◽  
Dissolved Organic Nitrogen ◽  
Organic Nitrogen ◽  
Treated Wastewater ◽  
Solids Retention Time ◽  
Solids Retention

Dissolved organic nitrogen (DON) during batch denitrification of low concentrations of nitrate using suspended and attached biomass

2015 ◽  
Vol 72 (11) ◽  
pp. 1896-1902
Author(s):  
D. N. Brandão ◽  
H. Spanjers ◽  
J. B. van Lier
Keyword(s):  
Surface Waters ◽  
Dissolved Organic Nitrogen ◽  
Organic Nitrogen ◽  
Treated Wastewater ◽  
Low Concentrations ◽  
Wastewater Disinfection ◽  
Attached Biomass ◽  
Final Effluent ◽  
By Products ◽  
Denitrification Process

The occurrence and removal of dissolved organic nitrogen (DON) is an issue of increasing importance for the reclamation of treated wastewater. Effluent DON may act as a precursor of disinfection by-products during wastewater disinfection and may contribute to eutrophication of receiving surface waters. The aim of this study was to understand the effect of the post-denitrification process on final effluent DON (organic nitrogen filtered by 0.45 μm pore size) concentration to further gain knowledge on how to optimize denitrifying filtration, in order to reach the required discharge standards. To evaluate DON variation, denitrification batch experiments were carried out with suspended and attached biomass under different shear conditions. For both conditions, with suspended and attached biomass, DON concentration did not increase or decrease during the denitrification process with addition of an external carbon source. Moreover, the increase of shear rate did not affect the DON concentration. Apparently, there is no direct link between DON evolution and the denitrification process itself.

Nitrogen enriched dissolved organic matter (DOM) isolates and their affinity to form emerging disinfection by-products

2009 ◽  
Vol 60 (1) ◽  
pp. 135-143 ◽  
Author(s):  
A. Dotson ◽  
P. Westerhoff ◽  
S. W. Krasner
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Dissolved Organic Nitrogen ◽  
Organic Nitrogen ◽  
Free Chlorine ◽  
Treated Wastewater ◽  
Health Concern ◽  
Isolation Method ◽  
By Products ◽  
Potential Conditions

Increased contributions from wastewater discharges and algal activity in drinking water supplies can lead to elevated levels of dissolved organic nitrogen (DON), which can increase the likelihood for the formation of emerging nitrogenous disinfection by-products (N-DBPs) of health concern. Dissolved organic matter (DOM) isolated from five waters, using a newly developed DOM isolation method specific to DON fractionation, produced thirty-four isolates of suitable mass. Each isolate was treated with free chlorine or chloramines under formation potential conditions. The DBP yields were determined for three halogenated DBPs (trichloromethane, dichloroacetonitrile, and trichloronitromethane) and one non-halogenated DBP (N-nitrosodimethylamine [NDMA]). Halogenated DBP yields were greater during the application of free chlorine, however chloramination produced significant levels of halogenated N-DBPs for some isolates. NDMA was only observed to form from selected nitrogen-enriched isolates (DOC/DON ratio < 20 mg/mg), especially those isolated from treated wastewater. Other results indicated that nitrogen-enriched DOM resulted in increased yields of the other N-DBPs studied.

scholarly journals Applicability of different textile materials in filtration process integrated with SBR for wastewater reuse in small settlements

2021 ◽  
Author(s):  
Sinem Gunes ◽  
Azize Ayol
Keyword(s):  
Activated Carbon ◽  
Water Reuse ◽  
Batch Reactor ◽  
Treated Wastewater ◽  
Carbon Cloth ◽  
Textile Materials ◽  
Research Activities ◽  
Treated Effluent ◽  
Filtration System ◽  
Filtration Unit

Abstract In recent years, research activities on water reuse applications have rapidly increased to manage natural water sources efficiently. Although these applications in centralized treatment systems can be effectively, there are some drawbacks including the economic factors for small settlements. In this study, a textile filtration unit with the integration of a sequencing batch reactor (SBR) was developed and different textile materials were used to enhance the treated effluent quality for reuse purpose. While the textile filtration unit alone could not effectively remove the pollutants, the removal efficiencies could not exceed 36% for COD and 50% for BOD5. However, SBR integration to the filtration system improved the treated wastewater quality and COD and BOD5 reductions were obtained higher than 93%. Activated carbon coated cotton textile materials and activated carbon cloth, which was first time used for wastewater treatment, increased the treatment performances. In the filtration system, although the suspended solids were high in the SBR effluent, no clogging problem was observed even higher operation times. This paper presents the research results on this textile filtration system and experimental findings are discussed on the applicability of the system for small communities.

scholarly journals The Potential of Wastewater Reuse for Agricultural Irrigation in Libya: Tobruk as a case study

2015 ◽  
Vol 17 (2) ◽  
pp. 357-369 ◽  
Keyword(s):  
Water Reuse ◽  
Wastewater Reuse ◽  
Sewage Treatment Plant ◽  
Treatment Plant ◽  
Environmental Benefits ◽  
Treated Wastewater ◽  
Food Crops ◽  
Agricultural Irrigation ◽  
Treated Effluent ◽  
Treated Wastewater Reuse

<div> <p>The aim of this paper is to highlight the way towards the exploitation of treated wastewater for food crops production in order to cope with the acute water scarcity and its hazardous consequences. Reclaimed water reuse has not been practiced in Tobruk, and hence, lack of relevant data and information was the major difficulty in carrying out this research. The existing sewage treatment plant in Tobruk city produces about 7,000 cubic meters per day of suitable effluent for agricultural irrigation and safe discharge. This proportion is worth twice as much as the water being currently used for irrigation. Therefore, with proper planning and management, treated wastewater reuse schemes, in addition to their economical and environmental benefits, can be an efficient mechanism to cope with water shortage and reducing the high burden placed on the desalination plant. Wastewater reuse is considered as a reliable, secure, and drought-resistant water source. Owing to the lack of disinfection processes and routinely monitoring data, there is uncertainty concerning the microbiological safety and quality of the treated effluent. Public perception might be the major challenge facing the planning for a reuse scheme as 51 % of the population of Tobruk have shown their reluctance to consume food crops irrigated with treated wastewater. Nonetheless, public attitudes can be fostered by awareness through the media as some people, when the issue was discussed, have shown a positive response. In fact their main concerns were related to public health safety and potential negative environmental impacts which can be addressed through good planning and prudent management.</p> </div> <p>&nbsp;</p>

Method Development for Measuring Biodegradable Dissolved Organic Nitrogen in Treated Wastewater

2009 ◽  
Vol 81 (8) ◽  
pp. 779-787 ◽  
Author(s):  
Eakalak Khan ◽  
Mayo Awobamise ◽  
Kimberly Jones ◽  
Sudhir Murthy
Keyword(s):  
Dissolved Organic Nitrogen ◽  
Organic Nitrogen ◽  
Method Development ◽  
Treated Wastewater
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