scholarly journals Effect of polyaluminium chlorides overdosage on effectiveness of coagulation and filtration

2015 ◽  
Vol 41 (1) ◽  
Author(s):  
Jolanta Gumińska ◽  
Marcin Kłos
Keyword(s):  
Coagulation And Filtration

Arsenic removal by coagulation and filtration: comparison of groundwaters from the United States and Bangladesh

Desalination ◽  
2004 ◽  
Vol 169 (3) ◽  
pp. 231-244 ◽  
Author(s):  
S WICKRAMASINGHE ◽  
B HAN ◽  
J ZIMBRON ◽  
Z SHEN ◽  
M KARIM
Keyword(s):  
United States ◽  
Arsenic Removal ◽  
The United States ◽  
Coagulation And Filtration

Hexavalent Chromium Removal by Reduction with Ferrous Sulfate, Coagulation, and Filtration:  A Pilot-Scale Study

2005 ◽  
Vol 39 (16) ◽  
pp. 6321-6327 ◽  
Author(s):  
Gang Qin ◽  
Michael J. McGuire ◽  
Nicole K. Blute ◽  
Chad Seidel ◽  
Leighton Fong
Keyword(s):  
Hexavalent Chromium ◽  
Ferrous Sulfate ◽  
Pilot Scale ◽  
Chromium Removal ◽  
Coagulation And Filtration

scholarly journals Neutralization, coagulation and filtration process in peat water

2019 ◽  
Vol 1402 ◽  
pp. 033019
Author(s):  
A Parabi ◽  
R Christiana ◽  
D Octaviani ◽  
M Zalviwan ◽  
E Noerhartati ◽  
...  
Keyword(s):  
Filtration Process ◽  
Coagulation And Filtration

Difference in behaviors of F-specific DNA and RNA bacteriophages during coagulation–rapid sand filtration and coagulation–microfiltration processes

2012 ◽  
Vol 12 (5) ◽  
pp. 666-673
Author(s):  
N. Shirasaki ◽  
T. Matsushita ◽  
Y. Matsui ◽  
T. Urasaki ◽  
K. Ohno
Keyword(s):  
Surface Charge ◽  
River Water ◽  
Treatment Process ◽  
Sand Filtration ◽  
Filtration Process ◽  
Dna And Rna ◽  
Treatment Processes ◽  
Particle Characteristics ◽  
Coagulation And Filtration ◽  
Rapid Sand Filtration

Difference in behaviors of F-specific DNA and RNA bacteriophages during coagulation–rapid sand filtration and coagulation–microfiltration (MF) processes were investigated by using river water spiked with F-specific DNA bacteriophage f1 and RNA bacteriophage f2. Because the particle characteristics of f1 (filamentous) and f2 (spherical) are quite different and the surface charge of f1 in the river water was slightly more negative than that of f2, the removal ratios of f1 were approximately 1-log lower than the removal ratio of f2 after any treatment process used in the present study. This result indicates that the behaviors of the two bacteriophages during the treatment processes were different, and that the removal of f1 by the combination of coagulation and filtration processes was more difficult than that of f2. The removal ratios for f1 and f2 were approximately 3-log and 4-log, respectively, in the coagulation–rapid sand filtration process, and 6-log and 7-log, respectively, in the coagulation–MF filtration process. Therefore, as expected, the coagulation–MF process appears to be more effective than the coagulation–rapid sand filtration process for the removal of not only spherical viruses but also filamentous viruses.

scholarly journals Reuse of Flowback Water from Hydraulic Fracturing for Drilling Mud Preparation and Secondary Hydrocarbon Recovery

Energies ◽  
2021 ◽  
Vol 14 (18) ◽  
pp. 5921
Author(s):  
Ewa Knapik ◽  
Katarzyna Chruszcz-Lipska ◽  
Łukasz Łukańko ◽  
Sławomir Wysocki
Keyword(s):  
Hydraulic Fracturing ◽  
Oil Recovery ◽  
Drilling Mud ◽  
Hydrocarbon Recovery ◽  
Flowback Water ◽  
Beneficial Reuse ◽  
Drilling Operations ◽  
Secondary Oil Recovery ◽  
Drilling Muds ◽  
Coagulation And Filtration

Flowback water after completion of hydraulic fracturing is one of major waste streams generated during the lifespan of a well so its beneficial reuse is crucial. The application of treated flowback is not limited to stimulation processes but also may include drilling operations and secondary oil recovery. The flowback water used in this work is characterized by high salinity reaching up to ~295 g/L caused mainly by NaCl. The presence of suspended solids, mainly corrosion products, prompts the use of coagulation and filtration as treatment methods. Among tested coagulants the most effective one was the SAX18 (NaAlO2) commercial coagulant applied at concentration of 12 mL/L which reduces the water turbidity from over 400 FTU to 23 FTU. The applied treatment greatly reduces the concentration of scaling ions and so the concentration of SiO2 is reduced by 64%, Ba2+–66%, Fe2–36%, Mn2+–65%, SO42−–66%. The treated flowback fluid can be reused in surfactant flooding for enhanced oil recovery where achieves 7% higher displacing efficiency than fresh water. The drilling muds which were prepared using the untreated flowback water exhibit good rheological properties. The obtained results show that recycling of flowback water in future drilling and exploitation operations is technically feasible.

Ozone: its effect on coagulation and filtration

2001 ◽  
Vol 1 (4) ◽  
pp. 81-88 ◽  
Author(s):  
W.C. Becker ◽  
C.R. O'Melia
Keyword(s):  
Water Quality ◽  
Organic Matter ◽  
Metal Salt ◽  
Drinking Water Treatment ◽  
The United States ◽  
Quality Characteristic ◽  
Cationic Polymers ◽  
Water Quality Characteristic ◽  
Treatment Train ◽  
Coagulation And Filtration

The interest in ozone for drinking water treatment in the United States has increased dramatically in recent years due to new regulations and concern over Cryptosporidium. Ozone has many benefits, however, its expense is significant and its placement in the treatment train should be chosen with a sound understanding of its effect on other unit processes. The goal of this paper is to provide an overview of the effect of ozone on the coagulation and filtration processes. This is important given the enhanced coagulation requirements of the disinfection by-product rule and the filtered water quality goals of the Partnership for Safe Water. The effect of ozone on coagulation is shown to be dependent on the coagulant type and on the water quality characteristic that is setting the optimum coagulant dose. For waters with moderate to high dissolved organic carbon (DOC) levels, the coagulant dose is set by the DOC. Ozonation converts NOM into smaller, more oxygenated compounds, e.g. oxalic acid, that exert a greater metal salt coagulant demand than the parent compounds. In this case, higher dosages of alum or ferric chloride are needed. For low DOC waters, the coagulant dose is set by the particle and the adsorbed organic matter. Ozone may react with adsorbed DOC and alter the amount and conformation of adsorbed organic matter, which can lead to a decrease in the optimum coagulant dose. Finally, because cationic polymers react with particles and large organic matter (and not the smaller compounds formed after ozonation), the optimum polyelectrolyte coagulant dose after ozonation is reduced. Ozonation prior to filtration (intermediate ozonation) is shown to be beneficial for significantly reducing filtered water particle counts by as much as an order of magnitude.

Biodegradation of haloacetic acids in water treatment processes

2009 ◽  
Vol 9 (5) ◽  
pp. 557-564 ◽  
Author(s):  
G. S. Wang ◽  
S. P. Lai ◽  
Y. T. Huang
Keyword(s):  
Water Treatment ◽  
Treatment Plant ◽  
Water Treatment Plant ◽  
Haloacetic Acids ◽  
Biological Degradation ◽  
Major Mechanism ◽  
Sand Surface ◽  
Treatment Processes ◽  
Tai Lake ◽  
Coagulation And Filtration

Formation and degradation of haloacetic acids (HAAs) in Tai Lake Water Treatment Plant (WTP) in Kin-Men County, Taiwan, were evaluated in this study. The results showed that formation of HAAs after chlorination is a fast process. Owing to the presence of fairly high organic precursors in the raw water, a large amount of HAAs (up to 80 μg/L in summer) was formed after addition of the pre-chlorine, and only a small portion of the HAAs was removed during the coagulation, flotation, and rapid filtration units. However, more than 80% of HAAs were removed in slow sand filtration (SSF) unit. Laboratory batch filtration tests showed that the HAAs can not be effectively removed by conventional coagulation and filtration treatments. However, the HAAs in water was effectively removed by biodegradation in batch biodegradation tests using filter sands taken from the top of the SSF unit in Tai Lake WTP. For comparison with the results obtained in batch experiments, simulated SSF systems were also installed in laboratory to evaluate the effects of biodegradation for HAAs removal in filter columns. Results of parallel laboratory SSF column tests showed that HAAs was quickly degraded when the simulated SSFs have been operated for a suitable time to allow the microbial growth on the sand surface. In both batch and simulated SSF biodegradation treatments, the biodegradation rates for HAAs decreased as the number of halogen atoms increased. The results in this study demonstrated that biological degradation is the major mechanism responsible for HAAs removal in the SSF units.

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