Electrocoagulation for the pathogenic and microorganism removal from Oued El-Harrach, Algeria wastewater

2017 ◽  
Vol 68 ◽  
pp. 129-236 ◽  
Author(s):  
Nouara Boudjema ◽  
Nadjib Drouiche ◽  
Nabil Mameri
Keyword(s):  
Microorganism Removal

scholarly journals Biosand Filter as a Point-of-Use Water Treatment Technology: Influence of Turbidity on Microorganism Removal Efficiency

Water ◽  
2020 ◽  
Vol 12 (8) ◽  
pp. 2302
Author(s):  
Daniela A. Duran Romero ◽  
Maria Cristina de Almeida Silva ◽  
Beni J. M. Chaúque ◽  
Antônio D. Benetti
Keyword(s):  
Water Treatment ◽  
High Efficiency ◽  
Total Coliform ◽  
Water Safety ◽  
Treatment Technology ◽  
Water Turbidity ◽  
Biosand Filter ◽  
Point Of Use ◽  
Pure Cultures ◽  
Microorganism Removal

The number of people living without access to clean water can be reduced by the implementation of point-of-use (POU) water treatment. Among POU treatment systems, the domestic biosand filter (BSF) stands out as a viable technology. However, the performance of the BSF varies with the inflow water quality characteristics, especially turbidity. In some locations, people have no choice but to treat raw water that has turbidity above recommended levels for the technology. This study aimed to measure the efficiency with which the BSF removes microorganisms from well water and from fecal-contaminated water with turbidity levels of 3, 25, and 50 NTU. Turbidity was controlled by the addition of kaolin to water. Turbidity removal varied from 88% to 99%. Reductions in total coliform (TC) and Escherichia coli ranged from 0.54–2.01 and 1.2–2.2 log removal values (LRV), respectively. The BSF that received water with a higher level of turbidity showed the greatest reduction in the concentration of microorganisms. Additional testing with water contaminated with four bacterial pure cultures showed reductions between 2.7 and 3.6 LRV. A higher reduction in microorganisms was achieved after 30–35 days in operation. Despite the filter’s high efficiency, the filtrates still had some microorganisms, and a disinfection POU treatment could be added to increase water safety.

Direct potable reclamation in Windhoek: a critical review of the design philosophy of new Goreangab drinking water reclamation plant

2013 ◽  
Vol 13 (2) ◽  
pp. 214-226 ◽  
Author(s):  
P. du Pisani ◽  
J. G. Menge
Keyword(s):  
Water Quality ◽  
Drinking Water ◽  
Water Reclamation ◽  
Treatment Technology ◽  
Design Philosophy ◽  
Fixed Part ◽  
Microorganism Removal ◽  
Safety Of Drinking Water ◽  
The City

Direct drinking water reclamation from the Goreangab reclamation plant, has been a reality in Windhoek, Namibia since 1968. Potable reclamation is a fixed part of the water supply and waste water has become an indispensible resource for the survival and continued growth of the city. The multi barrier concepts that were applied 40 years ago have been refined over many years. Improvements in water treatment technology have made it possible to improve the reliability and the drinking water quality of the reclamation treatment process. With the latest upgrade, which was designed 14 years ago and commissioned in 2002, a specific design philosophy was followed. This paper will assess whether the objectives of the design philosophy have been met in terms of removal efficiencies and safety of drinking water, which contains at present 25% reclaimed water. The basis and aims of the multi barrier design that was applied is discussed and with the aid of natural organic matter (NOM) and microorganism removal, the reliability of the philosophy is tested and compared with the goals set. Comparisons are drawn between the new plant and the previous plant and how the new plant is able to accommodate changes in raw water quality. It can be concluded that the water quality has been improved and the barrier principle does reduce the risk and improve the water quality.

scholarly journals Pollutant and Microorganism Removal From Water by Hydrodynamic Cavitation

2016 ◽  
Vol 10 (1) ◽  
pp. 258-264 ◽  
Author(s):  
Zhimeng Liu ◽  
Mengfu Zhu ◽  
Cheng Deng ◽  
Hongbo Su ◽  
Ping Chen ◽  
...  
Keyword(s):  
Reaction Time ◽  
Water Treatment ◽  
Operating Temperature ◽  
Removal Rate ◽  
Water Disinfection ◽  
Hydrodynamic Cavitation ◽  
Experimental Conditions ◽  
Water Treatment Process ◽  
Treatment Processes ◽  
Microorganism Removal

Hydrodynamic cavitation can effectively remove organic pollutants and microorganisms from water. Organic compound degradation and water disinfection removal rate is related to reaction time and operating temperature. Removal rate can be improved by increasing the reaction time or raising the operating temperature. Under our experimental conditions, the removal rate of colority, COD and petroleum pollutants was 80.0%, 72.13% and 70.00%, respectively. In addition, Escherichia coli removal rate was higher than 99.99%. As a new water treatment process, hydrodynamic cavitation can be utilized alone or in combination with other water treatment processes, showing broad application prospects.

Efficacy of photocatalytic HEPA filter on microorganism removal

Indoor Air ◽  
2010 ◽  
Vol 20 (3) ◽  
pp. 246-254 ◽  
Author(s):  
P. Chuaybamroong ◽  
R. Chotigawin ◽  
S. Supothina ◽  
P. Sribenjalux ◽  
S. Larpkiattaworn ◽  
...  
Keyword(s):  
Microorganism Removal

Surface Modification of Micro/Nano-Fabricated Filters

2012 ◽  
Vol 508 ◽  
pp. 87-98 ◽  
Author(s):  
Majid Ebrahimi Warkiani ◽  
Hai Qing Gong ◽  
Anthony Fane
Keyword(s):  
Membrane Fouling ◽  
Oxygen Plasma ◽  
High Surface ◽  
Oxygen Plasma Treatment ◽  
Clay Particles ◽  
Angle Measurements ◽  
Atomic Force ◽  
Contact Angle Measurements ◽  
Microorganism Removal ◽  
Filtration Properties

Polymeric Micro-Fabricated Filters Have Excellent Sieving Properties. Their Identical Properties such as High Surface Porosity and Perfectly Patterned Pore Structure, which Is Combined with Mechanical Strength Make them Ideal for many Applications such as Microorganism Removal, Blood Filtration and Protein Purification. To Improve the Performance of the Micro-Fabricated Filters, we Employed Oxygen Plasma Treatment to Increase the Surface Hydrophilicity and Reduce the Membrane Fouling during Microfiltration. Hydrophilization and Integrity of the Surfaces Were Analyzed by Contact Angle Measurements and Topographic Imaging with an Atomic Force Microscope (AFM). Treatment of Polymeric Membranes with Oxygen Plasma Led to a Stable Hydrophilization and an Increased Surface Roughness. The Filtration Properties of the Modified and Unmodified Membranes Were Examined Using Clay Particles. A Significant Increase in Total Collected Volume of Filtrate Was Observed for the Treated Membranes during Filtration of Simulated Drinking Water Samples Using Clay Suspension.

Microorganism removal in wastewater stabilisation ponds in maracaibo, Venezuela

1997 ◽  
Vol 35 (11-12) ◽  
pp. 205-209 ◽  
Author(s):  
L. Botero ◽  
M. Montiel ◽  
P. Estrada ◽  
M. Villalobos ◽  
L. Herrera
Keyword(s):  
Energy Resource ◽  
Microbiological Quality ◽  
Quality Requirement ◽  
Faecal Coliforms ◽  
Waste Stabilisation Ponds ◽  
The World ◽  
Sampling Points ◽  
Reasonable Cost ◽  
Microorganism Removal

Waste stabilisation ponds are an efficient means of wastewater treatment in many parts of the world wherever suitable land is available at reasonable cost and solar energy is an abundant energy resource. This study evaluated the removal of total coliforms TC, faecal coliforms FC and coliphages C in waste stabilisation ponds functioning as a pilot system in the tropical climate of Maracaibo, Venezuela. Sampling points included raw sewage and each pond effluent. Turbidity, pH and temperature were recorded. The results for raw sewage show average levels of 4.1×106 TC, 2.8×106 FC and 7.0×105 C/100mL. Temperature, pH and turbidity ranges between 26–31°C, 6.2–9.5 and 15–98 NTU respectively. Removal of microorganisms in the three systems ranged between 93–98%. Despite the high removal efficiency of microorganisms, the final effluents showed average counts of 5.4×104−1.4×105 TC, 5.2×104−1.3×105 FC and 1.6×104−4.7×104 C/100mL. This study shows that the microbiological quality of the final effluents did not achieve the WHO water quality requirement for FC (103/100mL); therefore, they cannot be used for irrigation. Additional treatments, such as slow sand filtration, are needed in order to improve the quality of the water.

The effect of preozonation on microorganism and particle removal

2000 ◽  
Vol 41 (7) ◽  
pp. 9-16 ◽  
Author(s):  
J. Y. Gaubert ◽  
C. Piet ◽  
D. Gatel ◽  
P. Bonne ◽  
J. Hutchison ◽  
...  
Keyword(s):  
Treatment Plant ◽  
Water Treatment Plant ◽  
Pilot Scale ◽  
Virus Inactivation ◽  
Particle Removal ◽  
Raw Water ◽  
European Regulation ◽  
Study Results ◽  
Microorganism Removal ◽  
By Products

The new European regulation on treated water focuses on oxidation by-products and consequently the use of ozone for parasites and virus inactivation should be limited. To achieve the necessary removal of parasites by a multi-barrier water treatment plant, physical removal needs to achieve consistently high levels of particle and microorganism removal. TheNeuilly-sur-Marne treatment plant treats raw water of particularly poor bacteriological quality. In order to improve the filtered water quality, preozonationhas been tested in a pilot scale study. Results obtained have confirmed that, with this sort of raw water, preozonation directly on the raw water or on the settled water can provide a significant improvement in filtered water. This is true for both particles and coliforms. It appears that an ozone dose of 0.5 g/m3 is enough to achieve a constant level of efficiency.

Microorganism removal from wastewater by rapid mixed media filtration

1986 ◽  
Vol 20 (5) ◽  
pp. 583-587 ◽  
Author(s):  
R. De Leon ◽  
S.N. Singh ◽  
J.B. Rose ◽  
R.L. Mullinax ◽  
C.E. Musial ◽  
...  
Keyword(s):  
Mixed Media ◽  
Microorganism Removal
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