Can UV-C laser pulsed irradiation be used for the removal of organic micropollutants from water? Case study with ibuprofen

2020 ◽  
Vol 742 ◽  
pp. 140507
Author(s):  
Francisco Rey-García ◽  
Benigno José Sieira ◽  
Carmen Bao-Varela ◽  
José Ramón Leis ◽  
Luis Alberto Angurel ◽  
...  
Keyword(s):  
Organic Micropollutants ◽  
Uv C ◽  
Pulsed Irradiation

scholarly journals Evaluation of Rural Household Drinking Water Treatment: A Case Study of Rajaf Payam Central Equatoria State, Juba-South Sudan

2021 ◽  
Vol 2 (2) ◽  
Author(s):  
Emmanuel Wani Jube Gore ◽  
Yulin Tang ◽  
Harrison H. Boying
Keyword(s):  
Drinking Water ◽  
Water Treatment ◽  
Drinking Water Treatment ◽  
Rural Regions ◽  
Treatment Methods ◽  
Solar Disinfection ◽  
Point Of Use ◽  
Treatment Technologies ◽  
Uv C

The supply of clean drinking water is one of the most critical facets of primary health care, the main challenges of sustainable development in rural regions. However, Rajaf Payam experiences significant challenges in accessing clean and safe water. The study is designed to explore drinking water treatment methods in Rajaf Payam. Questionnaire was designed to conduct survey on sources of drinking water and drinking water treatment methods in the area, published articles included reports from the national government and some NGOs working in the rural drinking water sector were collected. So far 200 people participated in this study, from whom 60% were male, 40% female. However, 50 critical informant interviews and surveys were conducted, with 150 participants filling out questionnaires. The results show that 66% of the community use chlorine for drinking water treatment. Nonetheless, 19% are using boiling method, 10% using normal filtration (Water settling). At the same time, 5% know nothing about drinking water treatment. Therefore, this study recommending the Point-of-use (POU) of drinking water treatment technologies such as boiling, slow sand filtration, chemical disinfection, flocculation and coagulation, UV-C disinfection, and solar disinfection to the community of Raja Payam to enable them to access high quality drinking water and to avoid chronic drinking water related disease.

scholarly journals THE EFFECT OF REYNOLDS NUMBER OF AIR FLOW DURING THE AIR STERILIZATION PROCESS WITH ULTRAVIOLET GERMICIDAL IRRADIATION LAMP

2021 ◽  
Vol 11 (3) ◽  
pp. 1-12
Author(s):  
Giorgos Kouropoulos
Keyword(s):  
Escherichia Coli ◽  
Reynolds Number ◽  
Streptococcus Pneumoniae ◽  
Flow Rate ◽  
Air Flow ◽  
Pathogenic Microorganisms ◽  
Ultraviolet Germicidal Irradiation ◽  
Sterilization Process ◽  
Uv C

This case study examines the effect that the Reynolds number of air flow has on the population oflive pathogenic microorganisms during the process of air sterilization using ultraviolet germicidalirradiation (UVGI) lamp in a closed air-duct. With this aim, the first discussion is the mathematicalmodel which regulates changes to the Reynolds number in terms of the percentage of populationfor the following live pathogenic microorganisms: Escherichia coli, Mycobacterium tuberculosisand Streptococcus pneumoniae, under special condition of flow rate and intensity of UVirradiation. In conclusion, as the velocity and the Reynolds number of the air flow in the ductincreases, the exposure time of the pathogens to the field of UV-C irradiation decreases, theeffect of UV-C irradiation and the germicide capabilities of the UVGI lamp are reduced.Consequently, the population of live pathogenic microorganisms increases.

Preparation of Drinking Water from the Surface Water of the Danube–A Case Study

1990 ◽  
Vol 22 (5) ◽  
pp. 253-258 ◽  
Author(s):  
Z. Hain ◽  
B. Dalmacija ◽  
D. Mišković ◽  
E. Karlović
Keyword(s):  
Drinking Water ◽  
Activated Carbon ◽  
Surface Water ◽  
Active Carbon ◽  
Biologically Active ◽  
Organic Load ◽  
Organic Micropollutants ◽  
Second Procedure ◽  
Biologically Active Carbon

Investigations of the removal of organic micropollutants (9 groups, 55 compounds, according to the EPA classification) from the Danube surface water to produce drinking water were carried out by two procedures. In the first procedure, micropollutants were oxidized with chlorine and the residues removed by means of powder active carbon*(PAC). The second procedure involved microbiological oxidation on biologically active carbon**(BAC).It was found that the Danube water treatment with 15 mg/dm3 of chlorine in the presence of PAC (60–90 mg/dm3), followed by coagulation with 51.1 mg/dm3 Al2(SO4)3 and 2.5 mg/dm3 FeCl3 resulted in the removal of the majority of the micropollutants. Furthermore, the BAC system was more efficient than the system involving PAC in removing organic micropollutants, especially those belonging to the pesticides and polyaromatics groups. A general conclusion would be that the BAC system is advantageous in respect of the removal of both total organic load and some micropollutants. * powdered activated carbon; ** biologically activated carbon

H2O2/UV-C oxidation of potential endocrine disrupting compounds: a case study with dimethyl phthalate

2009 ◽  
Vol 8 (5) ◽  
pp. 620 ◽  
Author(s):  
Tugba Olmez-Hanci ◽  
Ceren Imren ◽  
Idil Arslan-Alaton ◽  
Işık Kabdaşlı ◽  
Olcay Tünay
Keyword(s):  
Endocrine Disrupting Compounds ◽  
Dimethyl Phthalate ◽  
Endocrine Disrupting ◽  
Uv C

scholarly journals Multisource Groundwater Contamination under Data Scarcity: The Case Study of Six Municipalities in the Proximity of the Naameh Landfill, Lebanon

Water ◽  
2020 ◽  
Vol 12 (5) ◽  
pp. 1358
Author(s):  
Michele Citton ◽  
Sofie Croonenberg ◽  
Anwar El Shami ◽  
Ghina Chammas ◽  
Sammy Kayed ◽  
...  
Keyword(s):  
Water Quality ◽  
Solid Waste ◽  
Organic Micropollutants ◽  
Solid Waste Disposal ◽  
The Public ◽  
Chemical Indicators ◽  
Community Mapping ◽  
Trace Concentrations ◽  
Bacteriological Contamination

Lebanon is affected by a protracted environmental and solid waste crisis that is threatening the water resources and the public health of its communities. This study is part of a public participatory research project that aims to evaluate the impacts of solid waste disposal practices on water, air, and health in six villages of Lebanon, stigmatized by the presence of a regional landfill. Community mapping enabled the selection and testing of seven springs and three wells in the upstream basin and 11 wells in the lower basin, covering a broad list of chemical, physical, and bacteriological parameters. Two water quality indices (WQ-1 and WQ-2) were used to assess water quality in the study area. The results for the upstream wells and springs showed a significant bacteriological contamination, while the results in the lower wells showed high levels of conductivity, chlorides, and zinc along with the occurrence of organic micropollutants in trace concentrations. The comparison between the experimental data, with the natural background value established in the same area, did not show major differences, except for zinc and bacteriological indicators. The bacteriological contamination is most likely related to sewage infiltration into groundwater at the time of the assessment. Zinc may result from landfill leachate infiltration but also well corrosion. Saltwater intrusion affecting the coastal basin is masking the results for conductivity, chlorides, and sulfates, whereas the presence of small traces of organic micropollutants in the coastal aquifer may be related to leachate infiltration. WQI-1 results, which included bacteriological indicators, showed highly degraded water quality in the C1-C3 inner basin. In contrast, WQI-2, which includes physio-chemical indicators only, showed good water quality, slightly deteriorating in the coastal area, downstream of the Naameh landfill.

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