Assessment of selected heavy metals in some water treatment plants and household tap water in Greater Cairo, Egypt

2008 ◽  
Vol 19 (3) ◽  
pp. 367-376 ◽  
Author(s):  
M.R. Lasheen ◽  
G. El‐Kholy ◽  
C.M. Sharaby ◽  
I.Y. Elsherif ◽  
S.T. El‐Wakeel
Keyword(s):  
Heavy Metals ◽  
Water Treatment ◽  
Tap Water ◽  
Water Treatment Plants ◽  
Greater Cairo

scholarly journals Investigation on the fate of quinolone antibiotics in three drinking water treatment plants of China

2021 ◽  
Author(s):  
Zhiquan Liu ◽  
Yongpeng Xu ◽  
Yuan Wang ◽  
Fuyi Cui
Keyword(s):  
Drinking Water ◽  
Water Treatment ◽  
Tap Water ◽  
Drinking Water Treatment ◽  
Chemical Oxidation ◽  
Source Water ◽  
Water Treatment Plants ◽  
Detection Frequency ◽  
Quinolone Antibiotics ◽  
Carbon Filtration

Abstract Quinolone (QN) antibiotics are widely used all over the world and have been frequently detected in source water, but the occurrence in tap water and the treatment efficiencies of QNs by drinking-water treatment plants (DWTPs) were rarely reported. In the present study, the occurrence and distribution of six representative QNs in three urban DWTPs of China were investigated. The results showed that the concentrations of total QNs in the three source waters ranged from 26.4 ng/L to 313.8 ng/L and all of the six QNs were detectable with a detection frequency of 100% (4.6 to 121.7 ng/L). Enrofloxacin (ENR) and ofloxacin (OFL) were the dominant species of QNs and accounted for 40.1% to 79.5% of the total QNs. After the treatments, there were still considerable QNs in the finished water (total amounts of 74.9 ng/L to 148.4 ng/L). The adsorbed QNs could be readily treated with the removal of turbidity by DWTPs, but only a part of the dissolved QNs (13.6% to 68.5%) can be removed. This implies that the dissolved QNs were more hazardous in the source water. Pre-oxidation and disinfection could remove 15.8 ± 8.3% and 16.9 ± 10.8% of dissolved QNs, respectively, depending on the chemical structure of QNs and the types of oxidant. Chemical oxidation was more efficient than coagulation-sedimentation and filtration for the treatment of dissolved QNs. Ozone-granular activated carbon filtration may fail to remove dissolved QNs in the actual DWTPs, because of the insufficient dosage of oxidant and the competition effect of natural organic matter.

scholarly journals Ion-capture electrodialysis using multifunctional adsorptive membranes

Science ◽  
2021 ◽  
Vol 372 (6539) ◽  
pp. 296-299
Author(s):  
Adam A. Uliana ◽  
Ngoc T. Bui ◽  
Jovan Kamcev ◽  
Mercedes K. Taylor ◽  
Jeffrey J. Urban ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Water Treatment ◽  
Water Sources ◽  
Clean Water ◽  
Water Treatment Plants ◽  
Porous Aromatic Framework ◽  
Global Demand ◽  
One Step ◽  
Separation Strategy ◽  
Competing Ions

Technologies that can efficiently purify nontraditional water sources are needed to meet rising global demand for clean water. Water treatment plants typically require a series of costly separation units to achieve desalination and the removal of toxic trace contaminants such as heavy metals and boron. We report a series of robust, selective, and tunable adsorptive membranes that feature porous aromatic framework nanoparticles embedded within ion exchange polymers and demonstrate their use in an efficient, one-step separation strategy termed ion-capture electrodialysis. This process uses electrodialysis configurations with adsorptive membranes to simultaneously desalinate complex water sources and capture diverse target solutes with negligible capture of competing ions. Our methods are applicable to the development of efficient and selective multifunctional separations that use adsorptive membranes.

scholarly journals Antibiotic resistance profiles of Escherichia coli isolated from different water sources in the Mmabatho locality, Northwest Province, South Africa

2010 ◽  
Vol 106 (1/2) ◽  
Author(s):  
Constance N. Wose Kinge ◽  
C. Njie Ateba ◽  
D. Tonderai Kawadza
Keyword(s):  
Escherichia Coli ◽  
Antibiotic Resistance ◽  
Water Treatment ◽  
Tap Water ◽  
Water Sources ◽  
Diffusion Method ◽  
Index Test ◽  
E Coli ◽  
Water Treatment Plants ◽  
Different Water Sources

The antibiotic resistance profiles of Escherichia coli (E. coli), isolated from different water sources in the Mmabatho locality were evaluated. Water samples were collected from the local wastewater- and water-treatment plants, the Modimola Dam and homes in the area, and then analysed for the presence of E. coli, using standard methods. Presumptive isolates obtained were confirmed by the analytical profile index test. Antibiotic susceptibility testing was performed by the disc diffusion method. Of the 230 E. coli isolates tested, marked antibiotic resistances (over 70%) were observed for erythromycin, tetracycline, ampicillin, chloramphenicol and norfloxacin. Multiple antibiotic resistance patterns were also compiled. Overall, the phenotype T-Ap-E was frequent for E. coli isolated from the local wastewater and water-treatment plants, Modimola Dam and tap water. Cluster analysis performed showed a unique antibiotic resistance pattern which suggested a link between isolates from all sampling points. The findings indicated that improper wastewater treatment may have a potential impact on the dissemination and survival of E. coli, as well as other pathogenic bacteria in water for human and animal consumption. This may result in water- and food-borne disease outbreaks with a negative effect on antibiotic therapy.

scholarly journals Antibiotic resistance in tap water during the summer season – preliminary research

2019 ◽  
Vol 116 ◽  
pp. 00077
Author(s):  
Agata Siedlecka ◽  
Katarzyna Piekarska
Keyword(s):  
Antibiotic Resistance ◽  
Water Treatment ◽  
Distribution Systems ◽  
Water Distribution ◽  
Large Scale ◽  
Tap Water ◽  
Antibiotic Resistance Genes ◽  
Resistant Bacteria ◽  
Water Treatment Plants ◽  
Spatial And Seasonal Variation

Antibiotic resistance of bacteria is regarded as a global health risk and should be monitored in all environments, including tap water distribution systems. In this study, tap water samples were collected from two water treatment plants and selected points-of-use from the water distribution network. The abundances of antibiotic resistant bacteria were determined via culture-dependent method and the presence of selected antibiotic resistance genes was detected via PCR. The influence of the distance of points-of-use from water treatment plants on bacterial loads and antibiotic resistance phenomenon was evaluated. The paper presents preliminary results of a large-scale study concerning spatial and seasonal variation in antibiotic resistance of bacteria dwelling in the tap water system in Wrocław.

scholarly journals Inhibition of Activated Sludge Respiration by Heavy Metals

2020 ◽  
Vol 14 ◽  
Keyword(s):  
Waste Water ◽  
Heavy Metals ◽  
Heavy Metal ◽  
Water Treatment ◽  
Activated Sludge ◽  
Waste Water Treatment ◽  
Domestic Waste ◽  
Heavy Metal Concentrations ◽  
Water Treatment Plants ◽  
Different Types

Inhibition of the respiration microbial activity in the activated sludge caused by heavy metal concentrations (Cr, Cd, Cu and Ni) was studied by means of respirometric method using Strathtox respirometer (Strathkelvin Glasgow).The studied sludge samples were obtained from the two waste water treatment plants with different types of pollution (municipal waste water and domestic waste water)

scholarly journals Correlations of water iodine concentration to earlier goitre frequency in Sweden—an iodine sufficient country with long-term iodination of table salt

2019 ◽  
Vol 24 (1) ◽  
Author(s):  
Sofia Manousou ◽  
Maja Stål ◽  
Robert Eggertsen ◽  
Michael Hoppe ◽  
Lena Hulthén ◽  
...  
Keyword(s):  
Drinking Water ◽  
Water Treatment ◽  
National Survey ◽  
Water Samples ◽  
Tap Water ◽  
Thyroid Volume ◽  
Iodine Concentration ◽  
Urinary Iodine Concentration ◽  
Table Salt ◽  
Water Treatment Plants

Abstract Background Before iodination of Swedish table salt in 1936, iodine deficiency resulting in goitre and hypothyroidism was common. Sweden has become iodine sufficient, as shown in a national survey in 2007, proving its iodination fortification programme effective for the general population. The objective of this study was to collect drinking water from water treatment plants nationally and test if water iodine concentration (WIC) correlated to urinary iodine concentration (UIC) of school-aged children in a national survey 2007 to former goitre frequency in 1929 and to thyroid volume data in 2007. Methods In 2012, 166 treatment plants, located in 57% (166 of 290) of all Swedish municipalities, were asked to collect drinking water samples of approximately 10 ml. In 2007, tap water samples of the same volume were collected from 30 randomly selected schools for the national survey. Analysis of WIC was done in both treatment plants in 2012 (n = 166) and tap water in 2007 (n = 30). The correlation of WIC to the children’s UIC and thyroid volume after iodination was tested based on data from the national survey in 2007. The association of WIC to former goitre frequency was tested based on pre-iodination data, derived from a map of goitre frequency drawn in 1929. Results The median WIC from water treatment plants was 4.0 μg/L (range 0–27 μg/L). WIC was similar in coastal and inland areas, for both ground and surface water. WIC correlated with historical goitre areas and was lower in the goitre areas than in non-goitre areas (p < 0.001). WIC in the same municipalities as the schools correlated with the UIC of children (p < 0.01), but not with their thyroid volume. Conclusions WIC still contributes to iodine nutrition in Sweden, but iodination overrides the goitre effect.

Assessment of a wastewater stabilization pond system for removal of arsenic, iron, and ammonia from reverse osmosis water treatment plant residual wastewater

2021 ◽  
Author(s):  
Harrison Bull ◽  
Ali Ekhlasi Nia ◽  
Mohsen Asadi ◽  
Kerry McPhedran
Keyword(s):  
Heavy Metals ◽  
Drinking Water ◽  
Water Treatment ◽  
Treatment Plant ◽  
Drinking Water Treatment ◽  
Water Treatment Plant ◽  
Depth Data ◽  
Water Treatment Plants ◽  
Removal Of Arsenic ◽  
Wastewater Stabilization Ponds

Drinking water treatment plants (DWTPs) produce wastewaters with elevated concentrations of heavy metals, metalloids, ammonia, and other contaminants. These wastewaters require treatment via processes including wastewater stabilization ponds (WSPs). This study assessed the arsenic (As), iron (Fe), and ammonia (NH3) concentrations in a Saskatchewan DWTP WSP system of five sequential ponds. Drone imaging combined with flow and depth data was used to estimate retention times which increased from 7-9 to 8-10 days after the DWTP upgrade. Concentration trends showed Fe decreased from Pond 1 to 3 and increased in Ponds 3 and 5, while As decreased from Pond 1 to 5. Average effluent As concentrations of 10.6 µg/L were over the 5.0 µg/L guideline, while both Fe and NH3 concentrations guidelines were easily met post-upgrade in 2020. Several actions are recommended to ensure adequate WSP operation including dredging, aeration, and installing macrophytes capable of As uptake.

scholarly journals Heavy metals and arsenic in drinking water and health risk assessment of the region with the developed mining industry

2020 ◽  
Vol 99 (7) ◽  
pp. 725-732
Author(s):  
Gayane H. Babayan ◽  
Astghik G. Sakoyan
Keyword(s):  
Heavy Metals ◽  
Drinking Water ◽  
Water Treatment ◽  
Water Supply ◽  
International Standards ◽  
Pollution Level ◽  
Water Supply Systems ◽  
Water Abstraction ◽  
Water Treatment Plants

Introduction. Drinking water intended for South Armenia’s towns and rural communities is abstracted from minor mountain rivers belonging to the basins of the Voghchi and Meghri, the water of which is treated at five water treatment plants. The river basins are home to the major copper molybdenum and gold ore mining centers of the republic.The purpose of this research was to study heavy metals Ag, Al, As, Cd, Cu, Fe, Mo, Ni, Pb, Sn, Sb, Se, Zn, Hg, Te in centralized drinking water supply systems and assess drinking water-caused health risks to the population.Material and methods. In 2016-2017 from 43 sampling sites a total of 53 basic water samples were taken, including 14- from surface water supply sources, 16 - from water treatment plants, 33- from water supply networks. Heavy metals were determined by the atomic absorption method. To assess the quality of water on water abstraction sites relevant ecological (regional) norms and national and international standards were used. The risk of development of noncarcinogenic and carcinogenic effects was assessed in the case of oral intake of and dermal exposure to tap water.Results. On water abstraction sites, background regional levels of surface waters exceeded the concentration of aluminum, iron, molybdenum, tin, antimony (by as 13.3-1.1 times). Water treatment efficiency at water treatment plants is estimated at 12% - 69% depending on different metals. Concentrations of heavy metals in drinking water do not exceed the norms. The risk of development of noncarcinogenic effects in the population at chronic exposure to drinking water is insignificant (HI&lt;1), whereas a total carcinogenic risk exceeds a safety limit for arsenic (CR=9.59×10–5).Conclusion. The acceptable quality of drinking water supplied to consumers is not yet an index of sustainable and safe water supply in the studied region because of a water pollution level on intake sites, obsolete water treatment technologies, poor sanitation and technical condition of plants and water networks.

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