scholarly journals Removal of Stabilized Silver Nanoparticles from Surface Water by Conventional Treatment Processes

2019 ◽  
Vol 08 (02) ◽  
pp. 21-35 ◽  
Author(s):  
Hafiz H. M. Salih ◽  
Amro M. El Badawy ◽  
Thabet M. Tolaymat ◽  
Craig L. Patterson
Keyword(s):  
Silver Nanoparticles ◽  
Surface Water ◽  
Conventional Treatment ◽  
Treatment Processes

Silver nanoparticle removal from drinking water: flocculation/sedimentation or filtration?

2013 ◽  
Vol 13 (5) ◽  
pp. 1181-1187 ◽  
Author(s):  
Desmond F. Lawler ◽  
Anne M. Mikelonis ◽  
Ijung Kim ◽  
Boris L. T. Lau ◽  
Sungmin Youn
Keyword(s):  
Silver Nanoparticles ◽  
Drinking Water ◽  
Organic Matter ◽  
Natural Organic Matter ◽  
Conventional Treatment ◽  
Granular Media ◽  
Natural Waters ◽  
Consumer Products ◽  
Treatment Processes ◽  
Water Treatment Plants

Silver nanoparticles are used in a wide variety of consumer products and are therefore rapidly becoming ubiquitous in the natural environment; they can be expected to be found in the natural waters used as drinking water supplies. This research investigated whether such particles could be expected to be removed in conventional water treatment plants such as flocculation and filtration. Both flocculation and granular media filtration experiments with citrate-capped silver nanoparticles were performed at different ionic strengths and in the presence and absence of natural organic matter. The results were generally consistent with theories of particle destabilization that have been developed for larger particles (greater than 1 μm), suggesting that silver nanoparticles are likely to be removed in conventional treatment processes.

Optimization of Removal of 2-methylisoborneol from Drinking Water using UV/H2O2

2016 ◽  
Vol 19 (1) ◽  
Author(s):  
Fengxun Tan ◽  
Haihan Chen ◽  
Daoji Wu ◽  
Nan Lu ◽  
Zhimin Gao
Keyword(s):  
Drinking Water ◽  
Conventional Treatment ◽  
Advanced Oxidation ◽  
Odor Threshold ◽  
Treatment Processes ◽  
Advanced Oxidation Technology ◽  
Oxidation Technology

Abstract2-methylisoborneol (2-MIB) is a common odor-causing compound in drinking water with a low odor threshold (10 ng/L). Since conventional treatment processes cannot effectively remove it, this study investigated an advanced oxidation technology: UV/H

Reductive Dehalogenation – Challenges of Perfluorinated Organics

2021 ◽  
Vol 02 ◽  
Author(s):  
Joanna Kisała ◽  
Jakub Goclon ◽  
Dariusz Pogocki
Keyword(s):  
Electronic Structure ◽  
Chemical Stability ◽  
Conventional Treatment ◽  
Rational Design ◽  
Reduction Process ◽  
Reductive Dehalogenation ◽  
Emission Characteristic ◽  
Organic Micropollutants ◽  
Treatment Processes ◽  
Physical Principles

: In this mini-review, the problem of effective elimination of perfluorinated organic micropollutants from aquatic environment has been touched. The extraordinary chemical stability of common perfluorinated organic surfactants results in unsatisfactory efficiency of conventional treatment processes, which opens perspectives for photocatalytic methods - especially for reductive-dehalogenation. To tackle this challenge by photocatalysis one have to be aware of objective, physical limits set by very nature of the reduction process, electronic structure chemical stability, and formulation of the catalyst as well as emission characteristic of the light source. The paper provides some clues for rational design of reductive-dehalogenation oriented photolytic systems, which are derived on the basis of physical principles, and, rather sparse, experimental examples.

scholarly journals Serological responses to Cryptosporidium antigens among women using riverbank-filtered water, conventionally filtered surface water and groundwater in Hungary

2005 ◽  
Vol 3 (1) ◽  
pp. 77-82 ◽  
Author(s):  
Floyd Frost ◽  
Tim Muller ◽  
Gunther Craun ◽  
Kádár Mihály ◽  
Berencsi György ◽  
...  
Keyword(s):  
Drinking Water ◽  
Surface Water ◽  
Cryptosporidium Parvum ◽  
Conventional Treatment ◽  
Riverbank Filtration ◽  
Well Water ◽  
Confined Aquifer ◽  
Surface Water And Groundwater ◽  
The Mean ◽  
Intensity Of Response

We compared serological responses to Cryptosporidium parvum antigens using surplus sera from females undergoing routine screening for pregnancy from three counties in Hungary where bank-filtered surface water, conventionally filtered and disinfected surface water, and groundwater from either a karst or confined aquifer are commonly used for drinking water. The primary purpose was to determine whether the prevalence and intensity of serological responses, indicators of prior Cryptosporidium infection were similar for these populations. Women using groundwater from a confined aquifer had significantly lower mean serological responses for both the 15/17-kDa and 27-kDa (p<0.0001) antigen groups than women using conventionally filtered and disinfected surface water or karst well water. This is suggestive of less frequent infections. Women using bank-filtered water also had lower mean responses for both antigen groups. Among women using bank-filtered water, the mean intensity of response for both antigen groups was almost one-third of the mean response observed for women using conventionally filtered and disinfected surface water. These findings suggest that riverbank filtration may be an effective alternative to conventional treatment for reducing Cryptosporidium exposures and infection from surface drinking water sources.

Upgrading conventional treatment processes for water quality improvement - a pilot study

2002 ◽  
Vol 2 (5-6) ◽  
pp. 165-171
Author(s):  
J.-J. Chen ◽  
H.-H. Yeh ◽  
I.-C. Tseng ◽  
T.-F. Lin ◽  
W.-L. Lai
Keyword(s):  
Water Quality ◽  
Conventional Treatment ◽  
Profile Analysis ◽  
Eutrophic Lake ◽  
Total Hardness ◽  
The Third ◽  
Treatment Processes ◽  
Taste And Odor ◽  
Pilot Plant Test ◽  
Plant Test

Cheng Ching Lake Water Works (CCLWW), located in southern Taiwan, draws its raw water from a eutrophic lake, which is treated by conventional processes, including pre-chlorination, coagulation, sedimentation, filtration, and disinfection. As the taste- and odor-causing compounds from algae cannot be completely removed by conventional treatment processes, and the hardness is high, there are complaints about water quality. In searching for suitable processes to upgrade the existing facilities, a two-year pilot plant test was conducted. In total 13 processes were tested, which could be divided into three groups. The main feature of the first group was the modification of the existing conventional treatment processes, which included eliminating pre-chlorination and incorporating GAC. The second group incorporated pre- and post-ozonation, GAC bed, with or without pellet softening, into the conventional processes. The third group featured membrane processes, mainly nanofiltration (NF) and its various pretreatment processes, such as microfiltration (MF) or ultrafiltration (UF). The results show that although the first group has higher removal rates of dissolved organic and disinfection by-product precursors, as measured by NPDOC and THMFP, respectively, than those from the existing full-scale plants, the improvement in taste and odour was not adequate. For the second group, the dissolved organic parameters and biostability of the finished water were further improved, and half of the total hardness could be removed by pellet softening. However, earthy and fishy odours still could be detected occasionally by flavour profile analysis. Generally speaking, the third group with processes involving NF could produce the highest quality finished water: no matter organic, inorganic, organoleptic parameters, or biostability were concerned.

scholarly journals Decolorization of CI Reactive Blue 222 by immobilized basidiomycetes in response to different carbon and nitrogen inputs

Hoehnea ◽  
2018 ◽  
Vol 45 (2) ◽  
pp. 352-360
Author(s):  
Vera Maria Valle Vitali ◽  
Nara Ballaminut ◽  
Dácio Roberto Matheus
Keyword(s):  
Textile Industry ◽  
Conventional Treatment ◽  
Reactive Dyes ◽  
Solid Support ◽  
Dye Molecules ◽  
Luffa Cylindrica ◽  
Carbon And Nitrogen ◽  
Treatment Processes ◽  
Nitrogen Inputs ◽  
Consequent Increase

ABSTRACT Reactive dyes are found in the final effluents of the textile industry and cannot be removed by conventional treatment processes. The use of basidiomycetes appears to be an effective strategy to degrade dye molecules. In this paper, the parameters that favor decolorization of diazo dye were assessed using basidiomycetes immobilized in Luffa cylindrica. Different concentrations of saccharose and urea were assessed, in addition to the introduction of an enriched synthetic effluent. Results showed that the best decolorization occurred at the highest concentration of saccharose and the lowest of urea. It was observed a high biosorptive capacity of the solid support, which decreased when the effluent was enriched with saccharose and urea due to consequent increase in microbial activity. Using the enriched effluent, Pleurotus ostreatus decolorized about 70% within 48 hours, and Trametes villosa decolorized 58% after 240 hours. Peniophora cinerea did not respond to the conditions tested.

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