scholarly journals Bioaugmentation process of secondary effluents for reduction of pathogens, heavy metals and antibiotics

2016 ◽  
Vol 14 (5) ◽  
pp. 780-795 ◽  
Author(s):  
A. A. Al-Gheethi ◽  
R. M. S. R. Mohamed ◽  
A. N. Efaq ◽  
I. Norli ◽  
Abdullah Abd Halid ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Pathogenic Bacteria ◽  
Treatment Process ◽  
Subtilis Strain ◽  
Secondary Effluent ◽  
Salmonella Spp ◽  
Secondary Effluents ◽  
Removal Of Heavy Metals ◽  
Us Epa ◽  
Faecal Indicators

The study probed into reducing faecal indicators and pathogenic bacteria, heavy metals and β-lactam antibiotics, from four types of secondary effluents by bioaugmentation process, which was conducted with Bacillus subtilis strain at 45 °C. As a result, faecal indicators and pathogenic bacteria were reduced due to the effect of thermal treatment process (45 °C), while the removal of heavy metals and β-lactam antibiotics was performed through the functions of bioaccumulation and biodegradation processes of B. subtilis. Faecal coliform met the guidelines outlined by WHO and US EPA standards after 4 and 16 days, respectively. Salmonella spp. and Staphylococcus aureus were reduced to below the detection limits without renewed growth in the final effluents determined by using a culture-based method. Furthermore, 13.5% and 56.1% of cephalexin had been removed, respectively, from secondary effluents containing 1 g of cephalexin L−1 (secondary effluent 3), as well as 1 g of cephalexin L−1 and 10 mg of Ni2+ L−1 (secondary effluent 4) after 16 days. The treatment process, eventually, successfully removed 96.6% and 66.3% of Ni2+ ions from the secondary effluents containing 10 mg of Ni2+ L−1 (secondary effluent 2) and E4, respectively. The bioaugmentation process improved the quality of secondary effluents.

scholarly journals Elimination of enteric indicators and pathogenic bacteria in secondary effluents and lake water by solar disinfection (SODIS)

2013 ◽  
Vol 3 (1) ◽  
pp. 39-46 ◽  
Author(s):  
Adel A. S. AL-Gheethi ◽  
I. Norli ◽  
Mohd Omar Ab. Kadir
Keyword(s):  
Lake Water ◽  
Membrane Filtration ◽  
Pathogenic Bacteria ◽  
Fecal Coliforms ◽  
Secondary Effluent ◽  
Salmonella Spp ◽  
Solar Disinfection ◽  
Pet Bottles ◽  
Colony Forming Units ◽  
Secondary Effluents

The reduction of enteric indicators (fecal coliforms (FC) and Enterococcus faecalis) and elimination of pathogenic bacteria (Salmonella spp. and Staphylococcus aureus) in the secondary effluents and lake water by solar disinfection (SODIS) was studied in this article. FC, E. faecalis, Salmonella spp. and S. aureus were isolated and enumerated using membrane filtration techniques after SODIS of samples inside transparent polyethylene terephthalate (PET) bottles for 1, 2, 3, 4, 5, 6, 7 and 8 h. The results show that SODIS can reduce numbers of FC, Salmonella spp. and S. aureus by more than 4 log10 colony forming units (CFU)/100 mL after 6 h. However, regrowth of these bacteria was observed after the incubation of the treated samples at 37 °C for 24 h, whereas SODIS for 8 h would eliminate pathogenic bacteria and no regrowth would be observed in these samples as determined by an absence and presence technique using enrichment medium. E. faecalis was not eliminated in the secondary effluents and lake water by SODIS, but this bacterium was reduced to less than detection limits (1 CFU/100 mL) when the treated secondary effluent samples were stored for 16 days at room temperature. The elimination of pathogenic bacteria and reduction of enteric indicators resulted in undetectable levels using SODIS for secondary effluents and lake water.

Susceptibility for antibiotics among faecal indicators and pathogenic bacteria in sewage treated effluents

2013 ◽  
Vol 8 (1) ◽  
pp. 1-6 ◽  
Author(s):  
Adel A. S. AL-Gheethi ◽  
Norli Ismail ◽  
J. Lalung ◽  
Azieda Talib ◽  
A. N. Efaq ◽  
...  
Keyword(s):  
Antibiotic Resistance ◽  
High Resistance ◽  
Pathogenic Bacteria ◽  
Sewage Treatment ◽  
Salmonella Spp ◽  
Sewage Treatment Plants ◽  
Total Coliforms ◽  
E Coli ◽  
Treated Effluents ◽  
Faecal Indicators

The objective of this work was to study the prevalence of antibiotic resistance phenotypes among total coliforms (TC), E. coli, E. faecalis and Salmonella spp. in the sewage treated effluents generated from three sewage treatment plants in Penang Malaysia. Among the isolates tested, TC and E. coli occurred high resistance for cephalexin (100 and 90.47%), ampicillin (80.93 and 95.23%) and ciprofloxacin (19.06 and 14.3%) compared to E. faecalis (42.86, 71.4 and 4.7%) and Salmonella spp. (59.8, 47.46 and 14.3%) respectively. All E. coli strains, 76.18% of TC, 66.66% of E. faecalis and 35% of Salmonella spp. were multi-resistant.

Microbiological characterisation and impact of suspended solids on pathogen removal from wastewaters in dairy processing factories

2018 ◽  
Vol 85 (3) ◽  
pp. 391-395 ◽  
Author(s):  
Kelly Fitzhenry ◽  
Neil Rowan ◽  
William Finnegan ◽  
Xinmin Zhan ◽  
Eoghan Clifford
Keyword(s):  
Water Reuse ◽  
Pathogenic Bacteria ◽  
Suspended Solids ◽  
Wastewater Reuse ◽  
Dairy Wastewater ◽  
Salmonella Spp ◽  
Dairy Processing ◽  
Inactivation Efficiency ◽  
The Impact ◽  
Faecal Indicators

In this Research Communication we investigate the microbiological profile of 12 dairy wastewater streams from three contrasting Irish dairy processing factories to determine whether faecal indicators/pathogens were present and in turn, whether disinfection may be required for potential water reuse within the factory. Subsequently, the impact of suspended solids on the inactivation efficiency of Escherichia coli via two means of ultravoilet (UV) disinfection; flow-through pulsed UV (PUV) and continuous low pressure UV (LPUV) disinfection was analysed. Faecal indicators total coliforms and E. coli were detected in 10 out of the 12 samples collected at the dairy processing factories while pathogenic bacteria Listeria monocytogenes was detected in all samples collected at 2 out of the 3 factories. Salmonella spp. was undetected in all samples. The results also indicated that organic dairy wastewater solids had an impact on the performance efficiency of the PUV system and, to a lesser extent, the LPUV system. The findings indicate that the targeting of key pathogens would be required to enable wastewater reuse (and indeed effluent discharges if regulation continues to become more stringent) and that LPUV may offer a more robust disinfection method as it appears to be less susceptible to the presence of suspended solids.

Effectiveness of selected wastewater treatment plants in Yemen for reduction of faecal indicators and pathogenic bacteria in secondary effluents and sludge

2014 ◽  
Vol 9 (3) ◽  
pp. 293-306 ◽  
Author(s):  
Adel A. S. Al-Gheethi ◽  
M. O. Abdul-Monem ◽  
A. H. S. AL-Zubeiry ◽  
A. N. Efaq ◽  
A. M. Shamar ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Wastewater Treatment Plant ◽  
Pathogenic Bacteria ◽  
Wastewater Treatment Plants ◽  
Treatment Plant ◽  
Bacterial Isolates ◽  
Class A ◽  
Secondary Effluents ◽  
Class B ◽  
Faecal Indicators

The aim of this study was to evaluate the efficiency of wastewater treatment plants (WWTPs) in Yemen for reduction of faecal indicators and pathogenic bacteria in the secondary effluents and sludge. Hundred sixty bacterial isolates were obtained from 27 secondary effluents and sludge samples generated from Ibb wastewater treatment plant (IWWTP), Taiz wastewater treatment plant (TWWTP), Aden wastewater treatment plant (AWWTP1 and 2) and Sana'a wastewater treatment plant (SWWTP) in Republic of Yemen. Isolation of the bacteria was carried out by the direct plate method on the several selective media. The concentrations of faecal coliforms (FCs) were more than that recommended by World Health Organisation guidelines in all secondary effluents samples expect for those collected from TWWTP. FCs in the sludge from IWWTP and SWWTP were more than the standards limits recommended by United State Environmental Protection Agency (U. S. EPA) Class B, while sludge from AWWTP and TWWTP meet U. S. EPA standards limits Class A and class B, respectively. Among 160 bacterial isolates, E. coli was the most common (detected in 88.88% of the samples), followed by Streptococcus faecalis (70.37%), Klebsiella pneumonia (66.67%), Enterobacter aerogenes (59.23%), Salmonella typhi (33.33%), S. typhimurium and Shigella sonni (25.93% for each) and Yersinia pestis (22.22%). The sludge samples collected from IWWTP and TWWTP and stored for 24 weeks at room temperature (25 ± 2 °C) met the standards limits recommended by U.S. EPA, Class A.

Enhanced removal of heavy metals from electroplating wastewater through electrocoagulation using carboxymethyl chitosan as corrosion inhibitor for steel anode

2018 ◽  
Vol 4 (8) ◽  
pp. 1105-1113 ◽  
Author(s):  
Hao Sun ◽  
Han Wang ◽  
He Wang ◽  
Qun Yan
Keyword(s):  
Heavy Metals ◽  
Corrosion Inhibitor ◽  
Treatment Process ◽  
Carboxymethyl Chitosan ◽  
Electroplating Wastewater ◽  
Removal Of Heavy Metals

To prolong the life of electrodes, application and evaluation of carboxymethyl chitosan (CMCT), as a corrosion inhibitor for a steel anode, through electrocoagulation during the treatment process of electroplating wastewater was conducted.

Biosorption: An Eco-Friendly Technique for the Removal of Heavy Metals

2011 ◽  
Vol 2 (3) ◽  
pp. 1-8 ◽  
Author(s):  
Sasmita Sabat ◽  
◽  
R V Kavitha R V Kavitha ◽  
Shantha S L Shantha S L ◽  
Gopika Nair ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Removal Of Heavy Metals

Study of the Cu(II) removal from aqueous solutions by adsorption on titania

2013 ◽  
Vol 12 (3) ◽  
pp. 239-247
Keyword(s):  
Heavy Metals ◽  
Ionic Strength ◽  
Toxic Metals ◽  
Low Cost ◽  
Lateral Interaction ◽  
Tio2 Surface ◽  
High Toxicity ◽  
Removal Of Heavy Metals ◽  
Solution Parameters ◽  
Kinetics Of

The removal of heavy metals from wastewaters is a matter of paramount importance due to the fact that their high toxicity causes major environmental pollution problems. One of the most efficient, applicable and low cost methods for the removal of toxic metals from aqueous solutions is that of their adsorption on an inorganic adsorbent. In order to achieve high efficiency, it is important to understand the influence of the solution parameters on the extent of the adsorption, as well as the kinetics of the adsorption. In the present work, the adsorption of Cu(II) species onto TiO2 surface was studied. It was found that the adsorption is a rapid process and it is not affected by the value of ionic strength. In addition, it was found that by increasing the pH, the adsorbed amount of Cu2+ ions and the value of the adsorption constant increase, whereas the value of the lateral interaction energy decreases.

Synergistic Effect of Rhamnolipid and Saponin Biosurfactants on Removal of Heavy Metals from Oil Contaminated Soils

2020 ◽  
Vol 57 (2) ◽  
pp. 109-114
Author(s):  
Amirhossein Dolatzadeh khiyavi ◽  
Reza Hajimohammadi ◽  
Hossein Amani ◽  
Hadi Soltani
Keyword(s):  
Heavy Metals ◽  
Synergistic Effect ◽  
Contaminated Soils ◽  
Removal Of Heavy Metals
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