scholarly journals UV treatment efficiency for E. coli in storm water containing different size fractions of suspended solids

2016 ◽  
Author(s):  
S. McElmurry ◽  
N. Khalaf
Keyword(s):  
Suspended Solids ◽  
Storm Water ◽  
Treatment Efficiency ◽  
Uv Treatment ◽  
Size Fractions ◽  
E Coli

scholarly journals EFFICIENCY OF OIL REMOVAL FROM REAL STORM WATER WITH DIFFERENT SORBENTS / NAFTOS PRODUKTŲ ŠALINIMO IŠ PAVIRŠINIŲ NUOTEKŲ EFEKTYVUMAS NAUDOJANT SKIRTINGUS SORBENTUS

2011 ◽  
Vol 3 (5) ◽  
pp. 132-136
Author(s):  
Aušra Mažeikienė ◽  
Dovilė Rimkutė
Keyword(s):  
Water Surface ◽  
Suspended Solids ◽  
Storm Water ◽  
Oil Removal ◽  
Treatment Efficiency ◽  
Similar Treatment ◽  
Surface Water Flow ◽  
Filtering Rate ◽  
Matching Techniques ◽  
Comprehensive Study

Suspended solids and oil products are considered as the most important pollutants in storm water. Surface water flow and changes in pollutant concentration complicate conventional matching techniques and prolong the duration of technological processes; therefore, a comprehensive study on this area is necessary. For this reason, the research and analysis of three different sorbents (“FIBROIL®”, “Duck”, “Reo-dry”) were performed in the laboratory. According to the results of the conducted experiment, all three sorbents have similar treatment efficiency: “FIBROIL®” – 99%, “Reo-dry” – 95%, “Duck” – 98%. Filtering rate had an influence on the effectiveness of removing petrol products (slower speed increases effectiveness). Santrauka Didžiausiais paviršinių nuotekų teršalais laikomi naftos produktai ir skendinčiosios medžiagos. Vienas iš efektyviausių naftos produktų šalinimo iš nuotekų būdų yra filtravimas pro sorbuojančiosios medžiagos filtrą. Paviršinių nuotekų tekėjimas ir teršalų koncentracijų kaita apsunkina įprastinių technologijų suderinamumą, pailgina technologinių procesų trukmės laiką, todėl yra būtini šios srities išsamūs tyrimai. Šiame darbe buvo atliktas trijų skirtingų sorbentų (,,FIBROIL®“, „Duck“, „Reo-dry“) šalinant iš paviršinių nuotekų naftos produktus eksperimentinis efektyvumo tyrimas. Atlikus bandymus laboratoriniame stende, nustatyta, kad visų trijų sorbentų efektyvumas, šalinant naftos produktus, panašus: ,,FIBROIL®“ – 99 %, ,,Reo-dry“ – 95 %, ,,Duck“ – 98 %. Naftos produktų šalinimo efektyvumą veikė filtravimo greitis (kuo mažesnis greitis, tuo didesnis efektyvumas).

scholarly journals WATER QUALITY ANALYSIS: A CASE STUDY IN BYRAMANGALA LAKE WATER AND SURROUNDING GROUND WATER

2017 ◽  
Vol 5 (4RASM) ◽  
pp. 71-77
Author(s):  
Babitha Rani ◽  
Dimple Bahri ◽  
Prabin Neupane ◽  
Kunal Kothari ◽  
Vishal Gadgihalli ◽  
...  
Keyword(s):  
Water Quality ◽  
Ground Water ◽  
Lake Water ◽  
Suspended Solids ◽  
Quality Analysis ◽  
Total Hardness ◽  
Water Quality Analysis ◽  
E Coli

A study was carried out to find out the water quality ofByramangala lake of Ramanagara district. The water quality of Byramangala lake water and ground water from bore wells situated in the area within 600 meters surrounding the lake was analyzed. The quality analysis of various parameters such as BODs, COD, DO, E-Coli, and pH, Total Dissolved Solids, Total Suspended Solids and Total Hardness were tested. In addition, the presence of metals such as Cadmium (Cd), Chromium (Cr), Lead (Pb), and Iron (Fe) in the lake water and ground water samples were tested. Results for the various tests conducted showed similar trends for both lake water and ground water. It was observed that certain parameters such as BOD5, and COD were beyond permissible limits as per the BIS standards for drinking water. A few remedial measures have been proposed that may help in mitigating the pollution in the selected project area Byramangala Lake.

scholarly journals Solids Removal Efficiency of a Sedimentation Tank in a Peri-Urban Catchment

2020 ◽  
Vol 12 (17) ◽  
pp. 7196 ◽  
Author(s):  
Salvatore Falco ◽  
Giuseppe Brunetti ◽  
Giovanna Grossi ◽  
Mario Maiolo ◽  
Michele Turco ◽  
...  
Keyword(s):  
Removal Efficiency ◽  
Surface Runoff ◽  
Suspended Solids ◽  
Southern Italy ◽  
Treatment Efficiency ◽  
Urban Catchment ◽  
Sedimentation Tank ◽  
Basin Surface ◽  
Different Grain Size ◽  
Solids Removal

At the outlet of the Vermicelli catchment—a peri-urban area located in the campus of University of Calabria (Cosenza, Southern Italy)—a sedimentation tank is located, aiming at collecting the basin surface runoff and improve its quality. First, experimental results of the treatment effects are here presented and analyzed. In addition, a monitoring campaign was conducted in order to characterize the particles transported by surface runoff and to determine the treatment efficiency of the tank. The analysis showed the presence of a pollutant load in the surface runoff of the Vermicelli basin and provided information on its particle-size distribution (PSD). Results were considered in terms of the treatment efficiency of the sedimentation tank, showing a good overall removal efficiency value, together with a high variability of the removal sedimentation efficiency. This variability is mainly due to the different grain size of the suspended solids and the characteristics of the rainfall event.

Chlorination of pathogenic E coli O157

1998 ◽  
Vol 38 (12) ◽  
pp. 141-144 ◽  
Author(s):  
M. Kaneko
Keyword(s):  
Infectious Disease ◽  
Suspended Solids ◽  
E Coli ◽  
Foodborne Outbreaks

Foodborne outbreaks of infectious disease caused by enteropathogenic E coli O157 have occurred throughout Japan since 1996. This study was undertaken to check whether commonly used chlorination could effectively inactivate E coli O157 in water. Pathogenic E coli 157 could be as easily inactivated by chlorine as non-pathogenic E coli K12. Although the presence of suspended solids (<5mg/L) reduced the rate of E coli inactivation, waters obtained from properly operated treatment systems, including chlorination, would be safe against pathogenic E coli O157.

Modelling the influence of total suspended solids on E. coli removal in river water

2015 ◽  
Vol 73 (6) ◽  
pp. 1320-1332 ◽  
Author(s):  
Jueying Qian ◽  
Evelyn Walters ◽  
Peter Rutschmann ◽  
Michael Wagner ◽  
Harald Horn
Keyword(s):  
Particle Size ◽  
Large Scale ◽  
Suspended Solids ◽  
Total Suspended Solids ◽  
Sensitivity Coefficient ◽  
Fecal Indicator ◽  
E Coli ◽  
Size Classes ◽  
Sedimentation Process ◽  
Particle Size Classes

Following sewer overflows, fecal indicator bacteria enter surface waters and may experience different lysis or growth processes. A 1D mathematical model was developed to predict total suspended solids (TSS) and Escherichia coli concentrations based on field measurements in a large-scale flume system simulating a combined sewer overflow. The removal mechanisms of natural inactivation, UV inactivation, and sedimentation were modelled. For the sedimentation process, one, two or three particle size classes were incorporated separately into the model. Moreover, the UV sensitivity coefficient α and natural inactivation coefficient kd were both formulated as functions of TSS concentration. It was observed that the E. coli removal was predicted more accurately by incorporating two particle size classes. However, addition of a third particle size class only improved the model slightly. When α and kd were allowed to vary with the TSS concentration, the model was able to predict E. coli fate and transport at different TSS concentrations accurately and flexibly. A sensitivity analysis revealed that the mechanisms of UV and natural inactivation were more influential at low TSS concentrations, whereas the sedimentation process became more important at elevated TSS concentrations.

scholarly journals UvrD303, a Hyperhelicase Mutant That Antagonizes RecA-Dependent SOS Expression by a Mechanism That Depends on Its C Terminus

2008 ◽  
Vol 191 (5) ◽  
pp. 1429-1438 ◽  
Author(s):  
Richard C. Centore ◽  
Michael C. Leeson ◽  
Steven J. Sandler
Keyword(s):  
Excision Repair ◽  
Single Copy ◽  
Multicopy Plasmid ◽  
Uv Treatment ◽  
E Coli ◽  
Uv Sensitivity ◽  
C Terminus ◽  
Lexa Repressor ◽  
Nucleotide Excision ◽  
Terminal Amino

ABSTRACT Genomic integrity is critical for an organism's survival and ability to reproduce. In Escherichia coli, the UvrD helicase has roles in nucleotide excision repair and methyl-directed mismatch repair and can limit reactions by RecA under certain circumstances. UvrD303 (D403A D404A) is a hyperhelicase mutant, and when expressed from a multicopy plasmid, it results in UV sensitivity (UVs), recombination deficiency, and antimutability. In order to understand the molecular mechanism underlying the UVs phenotype of uvrD303 cells, this mutation was transferred to the E. coli chromosome and studied in single copy. It is shown here that uvrD303 mutants are UV sensitive, recombination deficient, and antimutable and additionally have a moderate defect in inducing the SOS response after UV treatment. The UV-sensitive phenotype is epistatic with recA and additive with uvrA and is partially suppressed by removing the LexA repressor. Furthermore, uvrD303 is able to inhibit constitutive SOS expression caused by the recA730 mutation. The ability of UvrD303 to antagonize SOS expression was dependent on its 40 C-terminal amino acids. It is proposed that UvrD303, via its C terminus, can decrease the levels of RecA activity in the cell.

scholarly journals Occurrence of Virulence Genes Associated with Diarrheagenic Pathotypes in Escherichia coli Isolates from Surface Water

2012 ◽  
Vol 79 (1) ◽  
pp. 328-335 ◽  
Author(s):  
Jatinder P. S. Sidhu ◽  
Warish Ahmed ◽  
Leonie Hodgers ◽  
Simon Toze
Keyword(s):  
Escherichia Coli ◽  
Health Risks ◽  
High Frequency ◽  
Aquatic Ecosystems ◽  
Virulence Genes ◽  
Storm Water ◽  
Storm Events ◽  
Widespread Occurrence ◽  
Content Type ◽  
E Coli

ABSTRACTEscherichia coliisolates (n= 300) collected from six sites in subtropical Brisbane, Australia, prior to and after storm events were tested for the presence of 11 virulence genes (VGs) specific to diarrheagenic pathotypes. The presence ofeaeA,stx1,stx2, andehxAgenes specific for the enterohemorrhagicE. coli(EHEC) pathotype was detected in 56%, 6%, 10%, and 13% of isolates, respectively. The VGsastA(69%) andaggR(29%), carried by enteroaggregative (EAEC) pathotypes, were frequently detected inE. coliisolates. The enteropathogenicE. coli(EPEC) genebfpwas detected in 24% of isolates. In addition, enteroinvasiveE. coli(EIEC) VGipaHwas also detected in 14% of isolates. During dry periods, isolates belonging to the EAEC pathotype were most commonly detected (23%), followed by EHEC (11%) and EPEC (11%). Conversely, a more uniform prevalence of pathotypes, EPEC (14%), EAEC (12%), EIEC (10%), EHEC (7%), and ETEC (7%), was observed after the storm events. The results of this study highlight the widespread occurrence of potentially diarrheagenic pathotypes in the urban aquatic ecosystems. While the presence of VGs inE. coliisolates alone is insufficient to determine pathogenicity, the presence of diarrheagenicE. colipathotypes in high frequency after the storm events could lead to increased health risks if untreated storm water were to be used for nonpotable purposes and recreational activities.

Effects of UV Irradiation on Selected Pathogens in Peptone Water and on Stainless Steel and Chicken Meat

2002 ◽  
Vol 65 (7) ◽  
pp. 1142-1145 ◽  
Author(s):  
T. KIM ◽  
J. L. SILVA ◽  
T. C. CHEN
Keyword(s):  
Escherichia Coli ◽  
Stainless Steel ◽  
Listeria Monocytogenes ◽  
Uv Irradiation ◽  
Processing Time ◽  
Chicken Meat ◽  
Escherichia Coli O157 ◽  
Uv Treatment ◽  
E Coli ◽  
Peptone Water

Effects of intensity and processing time of 254 nm UV irradiation on Listeria monocytogenes, Escherichia coli O157: H7, and Salmonella Typhimurium were investigated. Intensities measured at 5.08, 10.1, 15.2, and 20.3 cm from the light source were 1,000, 500, 250, and 150 μW/cm2, respectively. Intensities of 250 or 500 μW/cm2 reduced all suspended pathogen cells in peptone water about 5 log cycles after 2 min and completely inactivated L. monocytogenes and E. coli O157:H7 after 3 min by reductions of 8.39 and 8.64 log cycles, respectively. Intensities of 250 or 500 μW/cm2 also reduced (P ≤ 0.05) the tested pathogens inoculated on stainless steel (SS) chips, and E. coli O157:H7 was completely destroyed at 500 μW/cm2 for 3 min. After UV treatment for 3 min at 500 μW/cm2, all selected pathogens on chicken meat with or without skin showed reduction ranges from 0.36 to 1.28 log cycles. Results demonstrated that UV irradiation could effectively decrease pathogens in peptone water and on SS but that it was less effective on chicken meat.

scholarly journals Evaluation of the efficiency of selected wastewater treatment plant

2012 ◽  
Vol 60 (1) ◽  
pp. 173-180
Author(s):  
Tomáš Vítěz ◽  
Jana Ševčíková ◽  
Petra Oppeltová
Keyword(s):  
Wastewater Treatment ◽  
Wastewater Treatment Plant ◽  
Suspended Solids ◽  
Inorganic Nitrogen ◽  
Treatment Plant ◽  
Oxygen Demand ◽  
Ammonia Nitrogen ◽  
Total Efficiency ◽  
Treatment Efficiency ◽  
Wastewater Treatment Process

This paper is focused on primary, secondary, and total efficiency evaluation of the wastewater treatment process for chosen small wastewater treatment plant (WWTP) located near the Moravian Karst. Eight wastewater samples were taken during one year in three sampling profiles of WWTP: biochemical oxygen demand (BOD), chemical oxygen demand (COD), suspended solids (SS), pH, ammonia nitrogen (N-NH4), nitrite nitrogen (N-NO2), nitrate nitrogen (N-NO3), inorganic nitrogen (Ninorg), total phosphorus (Ptotal). Treatment efficiency by reduction was calculated for all laboratory analyzed indicators and average values were determined for the whole period. Calculated treatment efficiency of indicators BOD, COD and suspended solids was compared with the permissible minimum treatment efficiency of discharged waste water by Government Regulation No. 61/2003 Coll., for the WWTP from 500 to 2 000 PE. Permissible minimum treatment efficiency is not legislatively determined for the primary and secondary level. The results of the work will be used especially to compare results with other similar works.Analyzed values ​​of parameters BOD, COD, suspended solids, N-NH4 at the outflow from wastewater treatment plant were compared with the permissible maximum values at the outflow of the WWTP which the municipality has an obligation to respect according to the decision issued by the District Environment Authority.

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