scholarly journals Green Filtration of Total Solids from Various Water Sources Using Coconut Coir and Loofah

2021 ◽  
pp. 14-19
Author(s):  
Adedeji A. Adelodun
Keyword(s):  
Water Samples ◽  
Sea Water ◽  
Coastal Region ◽  
Volume Ratio ◽  
Water Sources ◽  
Water Volume ◽  
Total Solids ◽  
Sorption Efficiency ◽  
Coconut Coir ◽  
Seawater Samples

In this study, environmentally benign and readily available organic waste materials (coconut coir and loofah) were used as biofilters to remove total solids (TS) in water samples from various sources in Araromi Coastal Region of Ilaje Local Government, Nigeria. The TS levels observed in the river, pond, well, borehole, and seawater samples were 4,000, 1,610, 3,980, 2,600, and 34,800 mg/L, respectively. Generally, the organic filters reduced the TS in the water samples. Also, the sorption efficiency increased with the filter mass-to-water volume ratio. The overall performance of coconut coir was better than loofah, probably because the former has a more closely packed fibrous mesh. The optimum sorption efficiency of 60 g of the coconut coir filter for river, pond, well, borehole, and sea water was 50%, 78%, 80%, 92.3%, and 48.8%, while those for loofah were 42.5%, 56.3%, 70%, 84.6%, and 40.2%, respectively. This work showed that pretreated coconut coir is an efficient green filter for TS in water sources, especially boreholes, wells, and ponds.

Determination of Trace Amounts of Lead Using the Flotation-spectrophotometric method

2011 ◽  
Vol 6 ◽  
pp. ACI.S5948b
Author(s):  
Sabah Shiri ◽  
Ali Delpisheh ◽  
Ali Haeri ◽  
Abdolhossein Poornajaf ◽  
Babak Golzadeh ◽  
...  
Keyword(s):  
Water Samples ◽  
Sea Water ◽  
Tap Water ◽  
Molar Absorptivity ◽  
Alizarin Yellow ◽  
Low Concentrations ◽  
Relative Standard ◽  
Seawater Samples ◽  
Almost All

The present study describes a simple and highly selective method for separation, preconcentration and spectrophotometric determination of extremely low concentrations of lead. It is based on flotation of a complex of Pb2+ ions and Alizarin yellow between aqueous and n-hexane interface at pH = 6. The proposed procedure is also applied for determination of lead in both tap water and prepared sea water samples. Beer's Law was obeyed over the concentration range of 3.86 × 10-8 To 8.20 × 10-7 molL-1 (8-170 ngmL-1) with an apparent molar absorptivity of 1.33 × 106 molL-1 cm-1 for a 100 mL aliquot of the water sample. The detection limit (n = 10) was 8.7 × 10-9 molL-1 (1.0 ngmL-1) and the Relative standard deviation (R.S.D), (n = 10) for 7.2 × 10-7 molL-1 (150 ngmL-1) of Pb (II) was 4.36%. A notable advantage of the method is that the determination of Pb (II) is free from the interference of almost all cations and ions found in the environment and waste water samples. The determination of Pb (II) in tap and synthetic seawater samples was also carried out by the present method. The results were satisfactorily comparable so that the applicability of the proposed method was confirmed to the real samples.

scholarly journals BATHING WATER QUALITY IN DOBRICH REGION ON THE NORTHEAST BLACK SEA COAST

2021 ◽  
pp. 3-7
Author(s):  
N. Valkanova
Keyword(s):  
Black Sea ◽  
Sea Water ◽  
Coastal Region ◽  
Comparative Characteristic ◽  
The European Union ◽  
Standard Samples ◽  
Bathing Water ◽  
Bathing Waters ◽  
Seawater Samples

The quality of bathing water in Europe has remained high for decades. Bathing sites meet the highest and strictest "excellent" quality standards of the European Union. Aim and task: to make a comparative characteristic of the quality of bathing water in Dobrich region in the Northern Black Sea coastal region for 2018-2013 and 20142018. Materials: Seawater samples 880 pieces(2008-2013) pieces+740 pieces (2014-2018), in sterile glass bottles of 300-500 ml, sampled by RHI Dobrich, results of microbiological studies of seawater, reports, analyzes.  Methods: documentary, laboratory, statistical, graphic.  Results: The comparative analysis of the quality of bathing waters in two periods of 6 years (2008 - 2013) and 5 years (2014-2018) in the Northeast Black Sea coastal region of Dobrich District is based on the studied 20 sampling points. For 2008 - In 2013, non-standard seawater samples were detected by an average of 17.04%, with the highest relative share of 32.4% in 2011 and 31.69% in 2009, after which it dropped sharply to 0.70% in 2012 and 4.92% in 2013. The analysis of bathing water in the period 2014-2018 shows that in 75% of the points they have "excellent" assessment and 25% in "good".  Conclusions: 1. There is no health risk of pollution of sea water used for bathing in the summer season 20082013.2. Deviations with non-standard samples and repeatability during the two periods (2008 - 2013 and 20142018) are in two points - Bozhurets and Krapets-North.3.At the checkpoint Fish-Fish and Rusalka the bathing waters have improved the indicator from “good” to “Excellent”.

scholarly journals A Study on Distribution of Water Quality Parameters in Potable/Ground Waters of Visakhapatnam Coastal Region with Multivariate Factor Analysis

2021 ◽  
Vol 33 (11) ◽  
pp. 2645-2652
Author(s):  
V.V.K.P.L.N. Murty ◽  
P. V.S. Machiraju ◽  
P. Shyamala ◽  
A. Vinod Kumar
Keyword(s):  
Water Quality ◽  
Factor Analysis ◽  
Ground Water ◽  
Water Samples ◽  
Coastal Region ◽  
Quality Parameters ◽  
Water Sources ◽  
Water Quality Parameters ◽  
Ground Waters ◽  
Multivariate Factor Analysis

Chemical components of the earth crust influence the ground water quality. In addition, anthropogenic activities also contribute in deteriorating the quality of ground waters and contaminate the water sources. In present study, 22 water samples were collected from the potable/ground water sources in south coastal region of Visakhapatnam district, India during pre- and post-monsoon seasons and characterized for physico-chemical parameters viz., pH, electrical conductivity (EC), total dissolved solids (TDS), salinity, oxidation reduction potential (ORP), dissolved oxygen (DO), temperature, total hardness (TH), total alkalinity (TA), bicarbonate, carbonate, chloride, fluoride, sulphate, nitrate, phosphate, calcium, magnesium, sodium and potassium. The distribution of parameters was explained by Box-Whisker plot. Further Piper diagrams were drawn to identify the geochemical expressions between the parameters. Multivariate factor analysis was used to assess the degree of factor loadings and to identify the group of parameters influencing the variance of different water quality parameters. The analytical data indicated that majority of water samples in the study area have higher concentration of TDS, TH, TA, Ca2+, Mg2+, Na+, Cl−, HCO3 − and F−.

scholarly journals Determination of Trace Amounts of Lead Using the Flotation-spectrophotometric method

2010 ◽  
Vol 5 ◽  
pp. ACI.S5948 ◽  
Author(s):  
Sabah Shiri ◽  
Ali Delpisheh ◽  
Ali Haeri ◽  
Abdolhossein Poornajaf ◽  
Babak Golzadeh ◽  
...  
Keyword(s):  
Water Samples ◽  
Sea Water ◽  
Tap Water ◽  
Molar Absorptivity ◽  
Alizarin Yellow ◽  
Low Concentrations ◽  
Relative Standard ◽  
Seawater Samples ◽  
Almost All

The present study describes a simple and highly selective method for separation, preconcentration and spectrophotometric determination of extremely low concentrations of lead. It is based on flotation of a complex of Pb2+ ions and Alizarin yellow between aqueous and n-hexane interface at pH = 6. The proposed procedure is also applied for determination of lead in both tap water and prepared sea water samples. Beer's Law was obeyed over the concentration range of 3.86 × 10−8 To 8.20 × 10−7 molL−1 (8-170 ngmL−1) with an apparent molar absorptivity of 1.33 × 106 molL−1 cm−1 for a 100 mL aliquot of the water sample. The detection limit (n = 10) was 8.7 × 10−9 molL−1 (1.0 ngmL−1) and the Relative standard deviation (R.S.D), (n = 10) for 7.2 × 10−7 molL−1 (150 ngmL−1) of Pb (II) was 4.36%. A notable advantage of the method is that the determination of Pb (II) is free from the interference of almost all cations and ions found in the environment and waste water samples. The determination of Pb (II) in tap and synthetic seawater samples was also carried out by the present method. The results were satisfactorily comparable so that the applicability of the proposed method was confirmed to the real samples.

Study of The Influence of Different Variables on Clathrate Practical Applications in Phenol Removal

2020 ◽  
Vol 38 (9A) ◽  
pp. 1373-1383
Author(s):  
Riyadh S. AL- Mukhtar ◽  
Shurooq T. Remedhan ◽  
Marwa N. Hussin
Keyword(s):  
Crystal Structures ◽  
High Capacity ◽  
Volume Ratio ◽  
Constant Speed ◽  
Water Volume ◽  
Phenol Removal ◽  
Process Performance ◽  
Economic Costs ◽  
Practical Applications ◽  
Glass Cell

In this work, effluent wastewater treated by using cyclopentane-water Clathrate system to treat water contaminates with phenols at concentrations (300, 250, 200, 150, 100 and 50) ppm in order to investigate the capability of process performance. Clathrate or hydrate are strong crystal structures including water (host particles) and little particles (guest particles). The experiments were conducted at different cyclopentane-water volume ratios (1: 2 and 1: 4). The work was done in a 250 ml glass cell with an electric mixer at a constant speed of 280 cycles per minute. Phenol was highest removal percent at 300ppm at 1: 4volume ratio was (92.3%), while the lowest concentration at 50 ppm and 1: 2volume ratio was (55%). Yield and Enrich factor had the highest values at the lowest concentration 50ppm and 1:2 volume ratio were (85% and 2.42) respectively. The technique of the Clathrate proved that it has a high capacity in the separation and achieve high removal percentage compared to other methods at standard conditions when the pressure of 1 atmosphere and temperature higher than the degree of freezing water and less economic costs compared to other methods.

SITE-SPECIFIC EQUATIONS OF STATE FOR COASTAL SEA AREAS AND INLAND WATER BODIES

2017 ◽  
Author(s):  
Natalia Andrulionis ◽  
Natalia Andrulionis ◽  
Ivan Zavialov ◽  
Ivan Zavialov ◽  
Elena Kovaleva ◽  
...  
Keyword(s):  
Equation Of State ◽  
Black Sea ◽  
Water Samples ◽  
Equations Of State ◽  
Sea Water ◽  
Ionic Composition ◽  
Water Bodies ◽  
Aral Sea ◽  
The Black Sea ◽  
Coastal Sea

This article presents a new method of laboratory density determination and construction equations of state for marine waters with various ionic compositions and salinities was developed. The validation of the method was performed using the Ocean Standard Seawater and the UNESCO thermodynamic equation of state (EOS-80). Density measurements of water samples from the Aral Sea, the Black Sea and the Issyk-Kul Lake were performed using a high-precision laboratory density meter. The obtained results were compared with the density values calculated for the considered water samples by the EOS-80 equation. It was shown that difference in ionic composition between Standard Seawater and the considered water bodies results in significant inaccuracies in determination of water density using the EOS-80 equation. Basing on the laboratory measurements of density under various salinity and temperature values we constructed a new equation of state for the Aral Sea and the Black Sea water samples and estimated errors for their coefficients.

scholarly journals Carbon-14 in the Southern Indian Ocean

Radiocarbon ◽  
1980 ◽  
Vol 22 (3) ◽  
pp. 684-692 ◽  
Author(s):  
Georgette Delibrias
Keyword(s):  
Surface Water ◽  
Indian Ocean ◽  
Water Samples ◽  
Sea Water ◽  
Time Lag ◽  
Vertical Profiles ◽  
Carbon 14 ◽  
Middle Latitudes ◽  
The North ◽  
The Indian Ocean

14C measurements were carried out on sea water samples collected in 1973, in the Indian ocean. The results obtained for 9 vertical profiles between 27° S and 48°S are presented. In surface water, the bomb 14C content is maximum at middle latitudes. A time lag relative to the north hemisphere bomb 14C delivery is apparent. In the more southern latitudes, 14C content remains very low.

scholarly journals Characterisation of mobile colistin resistance genes (mcr-3 and mcr-5) in river and storm water in regions of the Western Cape of South Africa

2021 ◽  
Vol 10 (1) ◽  
Author(s):  
Yolandi Snyman ◽  
Andrew C. Whitelaw ◽  
Jo M. Barnes ◽  
Motlatji R. B. Maloba ◽  
Mae Newton-Foot
Keyword(s):  
South Africa ◽  
Water Samples ◽  
Pathogenic Bacteria ◽  
Multidrug Resistant ◽  
Water Sources ◽  
Storm Water ◽  
Gene Variants ◽  
Western Cape ◽  
Colistin Resistance ◽  
Three Rivers

Abstract Background Colistin is regarded as a last-resort antimicrobial against multi-drug resistant Gram-negative bacteria (GNB), therefore the dissemination of colistin resistance in the environment is of great concern. Horizontal transfer of mobile colistin resistance (mcr) genes to potential pathogens poses a serious problem. This study aimed to describe the presence of colistin resistant GNB and mcr genes in river and storm water in regions of the Western Cape. Methods Water samples were collected from three rivers during May 2019 and January 2020 and two storm water samples were collected in November 2019. Colistin resistant GNB were cultured on MacConkey agar containing colistin and identified by MALDI-TOF. Colistin resistance was confirmed using broth microdilution (BMD). mcr-1-5 genes were detected by PCR performed directly on the water samples and on the colistin resistant isolates. mcr functionality was assessed by BMD after cloning the mcr genes into pET-48b(+) and expression in SHuffle T7 E. coli. Results mcr-5.1 and various mcr-3 gene variants were detected in the Plankenburg-, Eerste- and Berg rivers and in storm water from Muizenberg, and only mcr-5.1 was detected in storm water from Fish Hoek. Colistin resistant GNB were isolated from all of the water sources. Aeromonas spp. were the most common colistin resistant organisms detected in the water sources; 25% (6/24) of colistin resistant Aeromonas spp. isolated from the Berg river contained novel mcr-3 variants; mcr-3.33 (n = 1), mcr-3.34 (n = 1) mcr-3.35 (n = 1) mcr-3.36 (n = 2) and mcr-3.37 (n = 1), which were confirmed to confer colistin resistance. Conclusions The mcr-5.1 and mcr-3 colistin resistance gene variants were present in widely dispersed water sources in regions of the Western Cape. The mcr genes were only detected in water sampled downstream of and alongside communities, suggesting that their presence is driven by human influence/contamination. This is the first documentation of mcr-3 and mcr-5 gene variants in any setting in South Africa. Spill-over of these genes to communities could result in horizontal gene transfer to pathogenic bacteria, exacerbating the challenge of controlling multidrug resistant GNB infections.

Effect of Synthesis Parameters on Size of the Biodegradable Poly (L-Lactide) (PLLA) Microspheres

2013 ◽  
Vol 858 ◽  
pp. 60-66 ◽  
Author(s):  
A.A. Hawari ◽  
C.Y. Tham ◽  
Zuratul Ain Abdul Hamid
Keyword(s):  
Electron Microscopy ◽  
Volume Ratio ◽  
Water Volume ◽  
Synthesis Parameters ◽  
Weight Variation ◽  
Infra Red ◽  
Biodegradable Poly ◽  
Evaporation Technique ◽  
Molecular Weight Variation ◽  
Scanning Electron

In this work, PLLA microspheres were prepared via emulsion solvent evaporation technique. Several synthesis parameters were studied to evaluate their effect on the size of PLLA microspheres. PLLA pallets before emulsion and PLLA microspheres surface chemistry after emulsion were determined using Fourier Transform Infra-red (FTIR). Results showed that PLLA pallets and microspheres FTIR obtained an identical spectrum. Microspheres size and surface morphology were determined using Scanning Electron Microscopy (SEM). In conclusion, the parameters that significantly affect the size of PLLA microspheres were PLLA concentration, DCM to water volume ratio, PVA concentration and stirring speed. PVA molecular weight variation showed no significant change in microspheres size.

Sewage contamination of coastal bathing waters in england and wales A bacteriological and epidemiological study

1959 ◽  
Vol 57 (4) ◽  
pp. 435-472 ◽  
Author(s):  
Keyword(s):  
Water Samples ◽  
Sea Water ◽  
Test Procedure ◽  
Great Majority ◽  
Controlled Study ◽  
England And Wales ◽  
Representative Sampling ◽  
Small Series ◽  
Bathing Waters ◽  
Ranking Order

1. Bacteriological surveys of more than forty popular bathing beaches around the coasts of England and Wales have been made during the past 5 years. The great majority of the beaches studied were subject to contamination with sewage.2. A rough grading of the beaches studied gave a similar ranking order whether the results of the presumptive coliform test or faecal coli counts were used as the basis of grading.3. Grading of beaches was valid only when surveys were carefully planned to ensure representative sampling from the areas on the beaches concerned where bathing actually took place.4. The coliform test as used in the bacteriological examination of drinking waters was the main test procedure used but had certain limitations. Promising results with plate counts on relatively non-inhibitory media were obtained.5. Various salmonella serotypes, notablySalm. paratyphi B, were isolated in small numbers from a high proportion of sea-water samples. The proportion of positive results for salmonella isolation increased from 13·3% in samples with less than 1000 coliform organisms per 100 ml. to 40·1% in samples with over 10,000 coliforms per 100 ml. Comparison of the numbers of salmonellae isolated with what is known of the minimum infective doses of these organisms suggested that very large volumes of sea water would require to be ingested for infection to occur.6. Poliovirus was not isolated from a small series of sea-water samples examined. Because of the very large dilution factor, special concentration procedures would probably be required to isolate this virus from sea water.7. Four cases of paratyphoid fever probably due to bathing were recorded. Surveys of the two associated beaches had given median presumptive coliform counts of more than 10,000 per 100 ml., and both showed gross macroscopic pollution with sewage.8. A statistically controlled study of the bathing histories of 150 poliomyelitis cases in children living permanently by the seaside gave no evidence that bathing had played any part in causing the disease.

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