Nitrate Movement in a Chilean Agricultural Area Irrigated with Untreated Sewage Water

1979 ◽  
Vol 8 (1) ◽  
pp. 27-30 ◽  
Author(s):  
E. B. Schalscha ◽  
I. Vergara ◽  
T. Schirado ◽  
M. Morales
Keyword(s):  
Sewage Water ◽  
Agricultural Area ◽  
Untreated Sewage

scholarly journals Growth Performance of the Mudfish, Clarias anguillaris (Pellegrin, 1923) in Treated and Untreated Domestic Sewage

2012 ◽  
Vol 2 (1) ◽  
pp. 62
Author(s):  
Agatha A Nwabueze
Keyword(s):  
Condition Factor ◽  
Growth Parameters ◽  
Oxygen Demand ◽  
Sewage Water ◽  
Domestic Sewage ◽  
Fish Growth ◽  
State University ◽  
Total Length ◽  
Untreated Sewage ◽  
Stock Tank

<p>Growth of the mudfish, <em>Clarias anguillaris</em> in of treated and untreated domestic sewage was investigated. Six weeks old fingerlings obtained from Delta State University, Asaba Campus Research Farm were used and the study lasted for 14 weeks. Fingerlings were kept in stock tank containing 10, 000 cm<sup>3 </sup>bore hole water and allowed to acclimate for two weeks. The stock tank was well aerated and fingerlings fed twice daily at the rate of 4% body weight with poultry mash in a daily renewal static bioassay system. The stock (0%- control) was then diluted with bole hole water serially to give 25, 50, 75 % strength of the treated and untreated domestic sewage and 100 % into which 10 fingerlings each were introduced. Weekly measurement of growth parameters of fish total length and weight were taken. The condition factor (k) was calculated. Increase in fish total length and weight in control, treated and untreated domestic sewage was observed. Growth of fish was significantly higher (P&lt;0.05) in the treated domestic sewage than in the untreated. There was no significant (P&gt;0.05) difference in total length of fish in all concentrations of treated domestic sewage as compared with controls. However, fish in 100% concentration of domestic sewage had a slower increase in total length than fish in other treated concentrations. Weight gain in <em>C. anguillaris</em> was higher in the 50% but not significantly (P&gt;0.05) higher than other concentrations of treated domestic sewage. The increase in fish weight in the untreated domestic sewage was not significantly (P&gt;0.05) different in all the treatments but was significantly (P&lt;0.05) lower than that of fish in the control. Condition factor of <em>C. anguillaris </em>in both the treated and untreated domestic sewage varied and decreased except for fish in 100% treated domestic sewage which was observed to have an increase in the value of the condition factor from 3.76g cm<sup>-3</sup> to 4.73g cm<sup>-3</sup>. Untreated domestic sewage water showed a higher turbidity, biochemical Oxygen Demand (B.O.D), alkalinity and nitrate composition of than treated sewage which had higher oxygen content and was clearer in appearance than the untreated. Microbial analysis shows the presence of <em>Escherichia fecalis, Streptococcus fecalis </em>and<em> Enterococcus fecalis </em>in untreated sewage with ciliated protozoans in both treated and untreated sewage. This study has shown that treated domestic sewage is best for healthy fish growth with reduced risk of transfer of pathogens.</p>

Effect of biochar and compost on cadmium bioavailability and its uptake by wheat–rice cropping system irrigated with untreated sewage water: a field study

2021 ◽  
Vol 14 (2) ◽  
Author(s):  
Muhammad Zia ur Rehman ◽  
Maqsooda Waqar ◽  
Safdar Bashir ◽  
Muhammad Rizwan ◽  
Shafaqat Ali ◽  
...  
Keyword(s):  
Field Study ◽  
Cropping System ◽  
Sewage Water ◽  
Untreated Sewage ◽  
Cadmium Bioavailability

scholarly journals Environmental health effects associated with recycling of sewage for potable purposes: a literature review

2019 ◽  
Vol 6 (4) ◽  
pp. 1815
Author(s):  
Mirza Jawad G. Baig ◽  
Aisha Ahmed ◽  
Gurpreet Singh Aujla
Keyword(s):  
Literature Review ◽  
Environmental Health ◽  
Sewage Water ◽  
Viable Option ◽  
Risks And Benefits ◽  
Environmental Health Risks ◽  
Untreated Sewage ◽  
Treated Sewage ◽  
Potential Benefits ◽  
Health Risks And Benefits

This literature review has been drafted to explore and emphasise the potential environmental health risks and benefits of recycling wastewater especially in areas affected by prolonged drought. With limited water resources, recycled treated sewage water can be used to augment the fresh water supply. This review will provide an understanding of the importance of water recycling and the environmental impacts recycling can have on the environment. A comparison is also provided to understand the environmental effects of untreated sewage on the environment and the potential benefits associated with the recycling. Public health aspect is also elaborated to highlight whether recycled treated sewage is a viable option to be considered for the use as potable water. Literature suggests that recycled treated water has a purifying effect on the environment and can be used for potable and non-potable purposes.

Presence of faecal coliforms, Escherichia coli and diarrheagenic E. coli pathotypes in ready-to-eat salads, from an area where crops are irrigated with untreated sewage water

2012 ◽  
Vol 156 (2) ◽  
pp. 176-180 ◽  
Author(s):  
Javier Castro-Rosas ◽  
Jorge F. Cerna-Cortés ◽  
Eligio Méndez-Reyes ◽  
Daniel Lopez-Hernandez ◽  
Carlos A. Gómez-Aldapa ◽  
...  
Keyword(s):  
Escherichia Coli ◽  
Sewage Water ◽  
Faecal Coliforms ◽  
E Coli ◽  
Untreated Sewage

scholarly journals Untreated sewage outfalls do not promote Trichodesmium blooms in the coasts of the Canary Islands

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Mar Benavides ◽  
Javier Arístegui
Keyword(s):  
Canary Islands ◽  
Metabolic Activity ◽  
Coastal Waters ◽  
Scientific Evidence ◽  
Sewage Water ◽  
Dust Deposition ◽  
Gran Canaria ◽  
Development Stages ◽  
Untreated Sewage ◽  
Local Media

Abstract During the summer of 2017, recurrent extensive blooms of the diazotrophic cyanobacterium Trichodesmium invaded the beaches and coastal waters of the Canary Islands, causing great social alarm. Some local media and public sectors ascribed, without any strong scientific evidence, the origin and reactivation of these blooms to untreated sewage outfalls distributed along the coasts. In order to test whether sewage outfalls could have any influence on the metabolic activity of Trichodesmium, we performed 13C and 15N2 uptake experiments with colonies experiencing three different bloom development stages, incubated both with clear seawater and sewage water from an outfall south of Gran Canaria island. Our results showed that sewage outfalls did not promote any increase in dinitrogen (N2) fixation in Trichodesmium, supporting the hypothesis that decaying blooms were generated offshore and transported shoreward by local currents and winds, accumulating mostly leeward of the islands. The combination of unusually warm seawater temperatures, enhanced and sustained stratification of the upper water column and recurrent dust deposition events would have favored the development of the Trichodesmium blooms, which lasted for at least four months.

scholarly journals Isolation of bacteriophages from untreated sewage water against multi-drug resistant E.coli - An initiative to fight against drug resistance

2019 ◽  
Author(s):  
Hina Qamar ◽  
Mohd Owais ◽  
Dushyant Kumar Chauhan ◽  
Sumbul Rehman
Keyword(s):  
Bacterial Infections ◽  
Pathogenic Bacteria ◽  
Therapeutic Potential ◽  
Alternative Therapy ◽  
Sewage Water ◽  
Coli Strain ◽  
Drug Resistant ◽  
Range Analysis ◽  
E Coli ◽  
Untreated Sewage

Abstract Background: Pathogenic Escherichia coli, common drinking water contaminant, cause a large number of morbidity and mortality worldwide. According to the WHO estimates approximately 63,000 annual deaths are due to E. coli infections. Due to selective pressure on coliforms, resistant microbial strains are produced that threatens modern medicine where common infections could become more deadly. So, there is an urgent need to develop alternative anti-microbial to replace existing antibiotics for treating a broad spectrum of bacterial diseases. This revived the interest of scientists in phages as an alternative therapy. Phage therapy is defined as a therapeutic use of bacteriophages (natural predators of bacteria) for treating bacterial infections. In the present study pure phage strain was isolated from the untreated sewage water sample and subjected to 10 fold dilution following double agar layer assay to determine phage titer against multi-drug resistant E.coli following host range analysis and stability testing at varying temperature and pH. Results: Sewage water contains a vast variety of different sizes bacteriophages with clear to diffused boundaries. The pure plaque isolated after repeated plating showed that it was highly specific against tested E. coli strain and could not lyse strains from other species. The titer was calculated to be 109 PFU/ml that remained unchanged at 4°C, 37°C and 50°C temperature. However, at higher pH range phage viability decreases. Conclusions: In future, it would be expected that the isolated bacteriophages could be characterized and used as a therapeutic potential against multi-drug resistant E.coli that not only attenuate superbug spread but could also replace antibiotics. Beside, isolated phages would be utilized as a bio-component in biosensor development against food borne pathogenic bacteria.

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