Search results

1

Occurrence of multidrug resistant and extended spectrum β-lactamase (ESBL) - producing Escherichia coli in wastewater of two healthcare facilities in Ibadan, Nigeria

100%

Adekanmbi A. O., Adeyemi A. O., Olajide O. M.

World News of Natural Sciences

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2019

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vol. 26

167-175

EN

Most industries in developing countries of the world, especially hospitals and other clinical settings, lack wastewater treatment facilities, and as such, untreated wastewater from their operations are discharged into water bodies without any form of treatment. This study aimed at the antibiotic sensitivity profile and ESBL production in E. coli isolated from untreated hospital wastewater before discharge into the environment. Untreated wastewater from two hospitals, a State Government-owned hospital (SGH) and a privately-owned hospital (POH) with no wastewater treatment facilities were sampled for a period of four months. Isolation of E. coli was carried out using the pour plate technique on Eosin Methylene Blue agar, while identification was carried out using conventional methods. Determination of ESBL production was done by means of the Double Disc Synergy Technique and antibiotic sensitivity testing was carried out by employing the disc diffusion method. A total of fifty-eight (58) E. coli were obtained: SGH at 55 and POH at 3. Herein, in 100% of the total count, resistance was indicated for ampicillin and ertapenem, while 14%, 11%, 16% and 57% of the total count were resistant to ceftazidime, cefpodoxime, cefotaxime and amoxicillin-clavulanate, respectively. In addition, 94.8% showed resistance to tetracycline, 19% to ciprofloxacin, 6.9% to gentamycin, 39.7% to chloramphenicol and 55% and 47% to sulfamethoxazole-trimethoprim and nalidixic acid, respectively. Furthermore, 94.8% of all the isolates were multidrug resistant (MDR), while 29.3% were ESBL positive. Wastewater from the two hospitals under study contained ESBL positive and MDR E. coli, suggesting a need to forestall a potential threat to public health by treating the wastewater generated by both hospitals before discharge into the environment.

2

Degradation of AB25 dye in liquid medium by atmospheric pressure non-thermal plasma and plasma combination with photocatalyst TiO2

100%

Ghodbane H., Hamdaoui O., Vandamme J., Van Durme J., Vanraes P., Leys C., Nikiforov A. Y.

Open Chemistry

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2015

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vol. 13

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issue 1

EN

In this work, degradation of the anthraquinonic dye Acid Blue 25 by non-thermal plasma at atmospheric pressure with and without photocatalyst is investigated. Titanium dioxide (TiO2) is used as a photocatalyst. The dye degradation by plasma in the presence of TiO2 is investigated as a function of TiO2 concentration, dye concentration and pH. The degradation rate is higher in acidic solutions with pH of 2 to 4.3, especially at pH 2, and decreases to 0.38 mg L-1 min-1 with the increase of pH from 2 to 5.65. A similar effect is observed in basic media, where a higher degradation rate is found at pH = 10.3. The degradation rate increases in the presence of TiO2 compared to the discharge without photocatalysis. The results show that the degradation of the dye increases in the presence of TiO2 until the catalyst load reaches 0.5 g L-1 after which the suppression of AB25 degradation is observed. The results indicate that the tested advanced oxidation processes are very effective for the degradation of AB25 in aqueous solutions.

3

Treatment of wastewater from production of meat-bone meal

100%

Makara A., Kowalski Z., Saeid A.

Open Chemistry

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2015

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vol. 13

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issue 1

EN

The paper presents the results of the selection of the flocculent and coagulant types as well as the evaluation of the best parameters of treatment of wastewater deriving from meat-bone meal (MBM) production. The efficiency of purification depends on the composition of the coagulant and flocculent as well as the magnitude of the applied dose. The use of ferrous sulfate PIX 113 coagulant assured the highest reduction of the contamination content in filtrate, resulting in the reduction of color of wastewater by 96.8%, turbidity by 99.2%, and the phosphorus content by 99.9% and nitrogen by 92.4%, with the Chemical Oxygen Demand (COD) being reduced by 62.8%. The X-ray method proved the significant presence of phosphorus salts in the content of sediment. The moisture content in the sediment varied from 45 to 78.5%. The elaborated method of pretreatment of wastewater from meat-bone meal unit was verified on an industrial scale. A very high reduction of the phosphorus content in filtrate (> 99.9%), and a significant reduction of COD as well as nitrogen and suspended solid contents (90−95%) were presented. A high reduction of contamination in filtrate increases the production capacity of the existing biological treatment plant, in the next step of treatment of filtrate in the biological treatment unit.

4

Low Bod Determination Methods: The State-of-the-Art

100%

Górski Ł., Trzebuniak K. F., Elżbieta M.

Chemical and Process Engineering

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2012

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vol. 33

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issue 4

629-637

EN

Biochemical Oxygen Demand (BOD) is an important factor used to measure water pollution. This article reviews recent developments of microbial biosensors with respect to their applications for low BOD estimation. Four main methods to measure BOD using a biosensor are described: microbial fuel cells, optical methods, oxygen electrode based methods and mediator-based methods. Each of them is based on different principles, thus a different approach is required to improve the limit of detection. A proper choice of microorganisms used in the biosensor construction and/or sample pre-treatment processes is also essential to improve the BOD lower detection limit.

5

Changes of Isotopic Composition in Gases Emitted from Wastewater Treatment Plant - Preliminary Study

88%

Stelmach W., Szarlip P., Trembaczowski A.

Ecological Chemistry and Engineering S

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2014

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vol. 21

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issue 2

245-254

EN

Investigations of processes occurring during wastewater treatment have progressed beyond the stage of technology. Currently, great numbers of representatives of diverse specialist research apply increasingly sophisticated measurement methods that have not been employed in this field of science. One of the methods is IRMS (Isotope Ratio Mass Spectrometry). Tracking changes in the ratios of biogenic element isotopes is useful in eg identification and monitoring of investigated processes. Since the IRMS technique has hardly been used for investigations of the wastewater treatment process, pilot research should be instigated to determine the isotope ratios occurring naturally in the process. The aim of the study was to determine changes in carbon and nitrogen isotope ratios at the successive stages of the technological line in wastewater treatment plants. The study material comprised: i) suspensions of raw sewage and mixtures of wastewater and activated sludge; ii) gases sampled from the volume of the suspensions; iii) gases sampled from the air above the suspension surface. The research material originated from the facilities of “Hajdow” municipal wastewater treatment plant in Lublin (SE Poland). The samples were analysed for the carbon and nitrogen isotope ratios, and the concentrations of the gases as well as total organic carbon (TOC), inorganic carbon (IC), Kjeldahl nitrogen (KN), dry weight, pH, and Eh were determined. The results obtained suggest that: i) the IRMS technique can be successfully applied in investigations of processes occurring during wastewater treatment; ii) isotope ratios in the carbon and nitrogen compounds (CO2 and N2) both in the suspensions and gases contained therein and in the air above them differ from each other and change at the different stages of the treatment process; iii) further research is indispensable in order to identify processes responsible for fractionation of carbon and nitrogen isotopes.

6

Variable dynamics of sewage supply to wastewater treatment plant depending on the amount of precipitation water inflowing to sewerage network

88%

Bugajski P. M., Kaczor G., Chmielowski K.

Journal of Water and Land Development

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2017

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issue 33

7

Aqueous p-nitrotoluene oxidation induced with direct glow discharge plasma

88%

Gao J., Liu Y., Yang W., Pu L., Yu J., Lu Q.

Open Chemistry

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2005

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vol. 3

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issue 3

377-386

EN

A plasma induced degradation process has been studied to treat 4-nitrotoluene (4-NT) present as an aqueous pollutant. The plasma was locally generated from a glow discharge around a tip of a platinum anode in an electrolytic solution. The influence of initial pH and Fe2+ on the degradation was examined. Major intermediates resulting from the degradation process were identified. Amongst the aromatic intermediates, p-hydroxybenzoic acid was the predominant degradation product. The formation of oxalic acid, malic acid was also observed. The final products of degradation were NH4+, NO3− and CO2. Based on the analysis of intermediates and the kinetic considerations, the degradation was shown to follow a pseudo-first order reaction hence, a possible reaction pathway was proposed.

8

COCAINE CONSUMPTION IN THE CITY OF MURCIA (SOUTHEAST OF SPAIN) ESTIMATED BY WASTEWATER ANALYSIS: APPLYING AN ACCURATE AND VALID TOOL TO OBTAIN OBJECTIVE DATA FOR DRUG ABUSE.

88%

Navarro-Zaragoza J., Fernández-López L., Caravaca F., Falcón M., Luna A.

Acta Poloniae Pharmaceutica - Drug Research

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2019

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vol. 76

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issue 1

137-145

EN

Cocaine consumption is one of the most relevant public health issues in America and Europe. There are different methods to estimate cocaine consumption, with different levels of accuracy. Although surveys is one of the most employed methods, it usually underestimates cocaine consumption. Recent studies have validated the use of wastewater analysis as the method that would provide more accurate results, as it is based on the analysis of residues of illicit drugs and their metabolites that are excreted by human flow through wastewater treatment plants. This study aims to estimate cocaine consumption in the southeast of Spain by wastewater analysis. Samples were analyzed by liquid chromatography coupled to tandem mass spectrometry (LC-MS/MS). According to this analysis, cocaine consumption has been estimated at 410,6 milligrams per day and per 1000 inhabitants, a higher result than that obtained at other European cities of similar size. Highest consumption occurs during the weekend, which is consistent with cocaine being categorized as a recreational drug. The results of this analysis show that cocaine use is an increasing public health and economic problem. Finally, wastewater analysis offers different options to estimate its use at this region of Spain.

9

Low Bod Determination Methods: The State-of-the-Art

88%

Malinowska E., Górski Ł., Trzebuniak K. F.

Chemical and Process Engineering

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2012

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issue 4

10

Changes in the composition of wastewater as a result of dehydrochlorination of 1,3-dichloropropan-2-ol under different process conditions

88%

Krzyżanowska A., Milchert E., Bartkowiak M.

Polish Journal of Chemical Technology

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2014

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vol. 16

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issue 1

92-96

EN

The results of dehydrochlorination of 1,3-dichloropropan-2-ol to epichlorohydrin are reported. The process ran in the reaction-stripping column system with a continuous removal of epichlorohydrin in a steam stream. The influence of 10 wt% alkali solution (NaOH, Ca(OH)2) and the method of distillate collection on the 1,3-dichloropropan-2-ol conversion, selectivity of transformation to epichlorohydrin and by-products, and the composition of wastewater have been analysed.

11

Research of Co2+ ions removal from water solution by using ion exchangers

88%

Bożęcka A., Sanak-Rydlewska S.

Gospodarka Surowcami Mineralnymi

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2018

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vol. 34

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issue 3

12

Sustainable sewage sludge management in Morocco: Constraints and solutions

75%

Ghacha A., Ben Alla L., Ammari M., Ghacha A., Ben Alla L., Ammari M.

Journal of Water and Land Development

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2020

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issue 46

13

Cultivation of Chlorella sp. for biodiesel production using two farming wastewaters in eastern Colombia

75%

Urbina-Suarez N. A., Barajas-Solano A. F., Garcia-Martinez J. B., Lopez-Barrera G. L., Gonzalez-Delgado A. D., Urbina-Suarez N. A., Barajas-Solano A. F., Garcia-Martinez J. B., Lopez-Barrera G. L., Gonzalez-Delgado A. D.

Journal of Water and Land Development

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2021

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issue 50

14

The efficiency of some fungi species in wastewater treatment

75%

Kadhim N. F., Mohammed W. J., Al Hussaini I. M., Al-Saily H. M. N., Ali R. N., Kadhim N. F., Mohammed W. J., Al Hussaini I. M., Al-Saily H. M. N., Ali R. N.

Journal of Water and Land Development

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2021

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issue 50

15

Sustainable management of wastewater: Theoretical design of combined upflow anaerobic reactors and artificial wetlands systems

75%

Guardia-Puebla Y., Llanes-Cedeño E., Rodríguez-Pérez S., Arias-Cedeño Q., Sánchez-Girón V., Morscheck G., Eichler-Löbermann B., Guardia-Puebla Y., Llanes-Cedeño E., Rodríguez-Pérez S., Arias-Cedeño Q., Sánchez-Girón V., Morscheck G., Eichler-Löbermann B.

Journal of Water and Land Development

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2020

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issue 47

16

Management model for water demand using the WEAP tool: Case of Setif Province– Algerian highlands

75%

Bouznad I. E., Elahcene O., Belksier M. S., Bouznad I. E., Elahcene O., Belksier M. S.

Journal of Water and Land Development

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2020

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issue 45

17

Sampling, metadata and DNA extraction - important steps in metagenomic studies

75%

Felczykowska A., Krajewska A., Zielińska S., Łoś J.

Acta Biochimica Polonica

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2015

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vol. 62

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issue 1

151-160

EN

Metagenomic studies have become increasingly popular. They allow for the estimation of biodiversity in complex populations. This diversity presents an enormous but largely unexpected genetic and biological pool and can be exploited for the recovery of novel genes, entire metabolic pathways and their products. Generally metagenomic study is a genomic analysis of organisms by direct extraction and cloning of DNA from their natural environment. The most common problems of modern metagenomics are as follows: majority of the microorganisms present in the environment cannot be cultivated by standard techniques, DNA extraction methods are not very effective, isolated DNA is contaminated with various compounds, a choice for a screening method is not obvious.

18

Natural Flood Management: A restatement of the Natural Science Evidence

75%

Ganiron Jr. T. U.

World News of Natural Sciences

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2017

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vol. 12

92-106

EN

Flood events often have severe socio-economic impacts, such as loss of lives and livelihoods, food, water and energy scarcity, and adverse impacts on human health and the environment. As far as feasible, human interference into the processes of nature should be reversed, compensated and, in the future, prevented. This study explores the possible solutions for the drainage system to ensure peak performance that might be adopted in España Boulevard, Manila. It aims to describe the wastewater management system to prevent and protect the adverse impact of flood events on human health and safety, on valuable goods and property, and on the aquatic and terrestrial environment.

19

Separation of Contaminants in The Freeze/Thaw Process

75%

Szpaczyński J. A., White J. A., Côté C. L.

Chemical and Process Engineering

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2017

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vol. 38

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issue 2

20

Assessment of physicochemical and bacteriological groundwater quality in irrigated Triffa Plain, North-East of Morocco

75%

Kadaoui M., Bouali A., Arabi M.

Journal of Water and Land Development

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2019

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issue 42

Refine search results

Occurrence of multidrug resistant and extended spectrum β-lactamase (ESBL) - producing Escherichia coli in wastewater of two healthcare facilities in Ibadan, Nigeria

Degradation of AB25 dye in liquid medium by atmospheric pressure non-thermal plasma and plasma combination with photocatalyst TiO2

Treatment of wastewater from production of meat-bone meal

Low Bod Determination Methods: The State-of-the-Art

Changes of Isotopic Composition in Gases Emitted from Wastewater Treatment Plant - Preliminary Study

Variable dynamics of sewage supply to wastewater treatment plant depending on the amount of precipitation water inflowing to sewerage network

Aqueous p-nitrotoluene oxidation induced with direct glow discharge plasma

COCAINE CONSUMPTION IN THE CITY OF MURCIA (SOUTHEAST OF SPAIN) ESTIMATED BY WASTEWATER ANALYSIS: APPLYING AN ACCURATE AND VALID TOOL TO OBTAIN OBJECTIVE DATA FOR DRUG ABUSE.

Low Bod Determination Methods: The State-of-the-Art

Changes in the composition of wastewater as a result of dehydrochlorination of 1,3-dichloropropan-2-ol under different process conditions

Research of Co2+ ions removal from water solution by using ion exchangers

Sustainable sewage sludge management in Morocco: Constraints and solutions

Cultivation of Chlorella sp. for biodiesel production using two farming wastewaters in eastern Colombia

The efficiency of some fungi species in wastewater treatment

Sustainable management of wastewater: Theoretical design of combined upflow anaerobic reactors and artificial wetlands systems

Management model for water demand using the WEAP tool: Case of Setif Province– Algerian highlands

Sampling, metadata and DNA extraction - important steps in metagenomic studies

Natural Flood Management: A restatement of the Natural Science Evidence

Separation of Contaminants in The Freeze/Thaw Process

Assessment of physicochemical and bacteriological groundwater quality in irrigated Triffa Plain, North-East of Morocco