Scientific Journal of Environmental Sciences

Scientific Journal of Environmental Sciences

Basic info

  • Publisher: Sjournals
  • Country of publisher: iran, islamic republic of
  • Platform/Host/Aggregator: Sjournals
  • Date added to EuroPub: 2017/Feb/20

Subject and more

  • LCC Subject Category: Soil Sciences, Environmental Sciences, Environmental Toxicology, Epidemiology
  • Publisher's keywords: Soil Sciences, Environmental Sciences
  • Language of fulltext: english
  • Time from submission to publication: 3 weeks

Publication charges

  • Article Processing Charges (APCs): Yes, 100 EUR
  • Submission charges: No
  • Waiver policy for charges? Yes

Open access & licensing

  • Type of License: Other
  • License terms
  • Open Access Statement: Yes
  • Year open access content began: 2012
  • Does the author retain unrestricted copyright? True
  • Does the author retain publishing rights? True

Best practice polices

  • Permanent article identifier: DOI
  • Content digitally archived in: LOCKSS
  • Deposit policy registered in: None

This journal has '51' articles

Numerical  investigation  on  packing  density  and  inlet  configurations  of  hollow  fibres and their effects on flow

Numerical investigation on packing density and inlet configurations of hollow fibres and their effects on flow

Authors: Keng Boon Lim| Professional Officers’ Division, Singapore Institute of Technology, Singapore., Peng Cheng Wang| Engineering, Singapore Institute of Te...
Year: 2016, Volume: 5, Number: 11
(73 downloads)
Abstract

This study aims to investigate the changes in output permeate flowrate of ultrafiltration hollow fibres with double - end configuration. Different parameters such as packing density, feed pressure and location of feed inlet are studied using Computational Fluid Dynamics (CFD). This study adopts the numerical approach to predict how each of the factors influence the output (i.e. flowrate) of the filtration process. Preliminary studies were done to validate the numerical predictions against existing literature, showing good agreement with available data. The effect of packing density on hollow fibre with double-end configuration was then investigated. The ratio of allowable spaces between fibres, denoted by ε, was used to quantify the packing density. 2 sets of numerical model for double-end hollow fibre with ε ranging from 0.2 to 0.8 were simulated for fibre length of 1 metre and 2 metre respectively. Results showed that a higher ε value used in for the packing of hollow fibres lead to higher permeate flowrate. However, this increment stagnates even as ε is increased beyond 0.6. Other factors such as inlet positioning and fibre length, which affects feed pressure distribution were also investigated. Simulation results concluded that feed pressure distribution and output flowrate varies depending on where the inlet is situated. The proposed new inlet located along the fibre length also improves the uniformity of the feed pressure distribution along hollow fibres. This makes positioning of the inlet crucial to the overall performance of the ultrafiltration module.

Keywords: Hollow fibres, Ultrafiltration, Packing density, CFD, Numerical simulation
Impact of spent engine oil on soil and the growth of Zea mays seeds

Impact of spent engine oil on soil and the growth of Zea mays seeds

Authors: F.O. Uhegbu*| Department of Biochemistry, Faculty of Biological and Physical Sciences. Abia State University. PMB 2000 Uturu, Nigeria., E.I. Akubugwo|...
Year: 2012, Volume: 1, Number: 1
(55 downloads)
Abstract

The impact of waste engine oil on soil and the growth of Zea mays seeds were investigated in this paper. Three concentrations of 500mL, 1000mL, and 1500mL waste engine oil applied to the soil affected the soil and growth of Zea mays seeds. The pH of soil increased from 6.0 (control) to 6.7 (1500mL), moisture content decreased significantly [p<0.05] from 12.0 to 10.9%, while phosphorus decreased significantly [p<0.05] from 35.0 to 20.0 mg/kg. The reductions in the measured parameters were significant at [p<0.05]. Potassium decreased from 0.20+0.01 to 0.18+0.06 umol/kg, magnesium from 2.80 ±0.02 to 1.80±0.01umol/kg, and calcium from 7.40+0.04 to 6.24+ 0.01 umol/kg. Germination of the seed, growth rate and leaf spread were also delayed. This study showed to a great extent that spent engine oil affects vegetative land and suggests that plants could be used as bio-indicators of pollution in oil producing and oil spillage prone areas of the Niger Delta of Nigeria.

Keywords: Spillage, Contamination, Pollution, Environmental impacts, Plants, Bio-indicators
Impact of wind turbines on birds: a case study from Gujarat, India

Impact of wind turbines on birds: a case study from Gujarat, India

Authors: S. Ramesh Kumar| Division of Environmental Impact Assessment, Sálim Ali Centre for Ornithology and Natural History (SACON), Anaikatty, Coimbatore-641...
Year: 2012, Volume: 1, Number: 1
(59 downloads)
Abstract

Rising generation costs, shortage of fuel sources and high environmental costs have raised serious concerns about the sustainability of conventional power generation methods. In this context, the wind-based power generation is gaining prominence, as an alternate source of renewable energy. Globally, India is at fifth position in wind power generation with an installed capacity of 14550 MW. However, based on recent reports from certain parts of the world, there is also a growing concern on the environmental impacts of wind turbines on birds. The present field study was conducted to evaluate these impacts in an Indian context. We have been studying the birds from a wind farm in Kutch District, Gujarat, India since September 2011 and our preliminary results of the past one year study is presented here. We used line transect method to estimate the bird species composition and standardized visual search methods to record the fatalities of birds caused by turbines. During the study span, 139 bird species were recorded which include eight Near threatened species as per IUCN Red list. Totally six bird fatalities were recorded as a result of collisions with the wind turbines. Preliminary findings of this study confirm the possible impact of wind turbines on birds in Kutch region.

Keywords: Birds, Fatalities, Gujarat, Impact, Wind farm
Concentrations of heavy metals in three commonly used medicinal vegetables in Akwa- Ibom state

Concentrations of heavy metals in three commonly used medicinal vegetables in Akwa- Ibom state

Authors: F.O. Ogbemudia| Department of Botany and Ecological studies, University of Uyo, Uyo, Akwa-Ibom State, Nigeria., I.N. Bassey| Department of Botany and...
Year: 2012, Volume: 1, Number: 2
(62 downloads)
Abstract

The concentrations of heavy metals were studied in three medicinal vegetables in Akwa- Ibom State. The plants used in this study were Gongronema latifolium; Telferia occidentalis and Vernonia amygdalina. The heavy metals investigated were lead (Pb), Zinc (Zn), Copper (Cu), Cobalt (Co), Chromium (Cr), Nickel (Ni), Cadmium (Cd), Manganese (Mn) and Iron (Fe). Dry ashing methods were used in obtaining samples for heavy metal analysis. Quantities of the heavy metals were read off using Atomic Absorption Spectrophotometer (AAS). The results of the work showed variations in the concentrations of these metals which ranged from slightly low to high amounts, Zn, Cu, Fe, and Mn had high values, while Pb, Cd, Co, Cr and Ni had relatively low concentrations in the vegetables. The results of the findings are discussed.

Keywords: Heavy metals, Medicinal vegetables, Akwa Ibom, Nigeria
Mathematical modeling and simulation of Salmonnela transport influenced by porosity and void ratio in soil and water: Eleme Niger delta of Nigeria

Mathematical modeling and simulation of Salmonnela transport influenced by porosity and void ratio in soil and water: Eleme Niger delta of Nigeria

Authors: S.N. Eluozo| Subaka Nigeria Limited Port Harcourt Rivers State of Nigeria.
Year: 2012, Volume: 1, Number: 4
(56 downloads)
Abstract

Salmonella transport in soil and water is a serious microbial containment that is a threat to human life, salmonella containment has been found to survival in several days in soil, if there is no regeneration and that will definitely increase microbial population, more so, the microbes also increase when there is high degree of substrate utilization. Mathematical model were developed to express the behavior of the microbes and there transport process. This condition were considered as the system that where developed, considering this variables. The model were developed to monitor the growth rate of the microbes, there rate of concentration at different formation, where found to be influenced by a lots of factors, but the most depressing one where the degree of porosity of the soil, this were found to have influence on the fast migration of the microbes within a short period of time, the conditions where considered and where integrated in derived model the developed model values compared faviourably well with the experimental values, the model will definitely monitor the transport of salmonella in prelatic aquifers.

Keywords: Mathematical modeling, Salmonella transport, Soil, Water, Human life
Model prediction and evaluation to monitor the behaviour of thermotolerant transport in homogeneous formation in Isiokpo rivers state of Nigeria

Model prediction and evaluation to monitor the behaviour of thermotolerant transport in homogeneous formation in Isiokpo rivers state of Nigeria

Authors: S.N. Eluozo| Subaka Nigeria Limited Port Harcourt Rivers State of Nigeria.
Year: 2012, Volume: 1, Number: 4
(54 downloads)
Abstract

Model prediction and evaluation were to assess the model that can be applied to solve the challenges of Thermotolerant transport in the study area, the model are from experimental results through, an equation from the experiments value were resolved, it generated theoretical values, these values were compared with developed analytical model values, both values compared faviourable well, the model where able to confirm the rate of high degree of substrate utilization base on the rate of concentration in Aquiferious zone, high degree of porosity has influence fast migration of microbes as presented in the figures, this condition are also from the influence on the geologic history of the study area, shallow aquifers that deposit in the study locations were as a results from these dimension, the deltaic nature in the study area are also one of the influence of fast migration of Thermotolerant to ground water aquifers, the comparative models are imperative, because microbial transport has a lots of influence, and in most cases the behaviour of Thermotolerant is not linear, the model that can solved these sources of pollution from these dimension should be thoroughly evaluated, this is to ensure that the models can definitely solve the problem of Thermotolerant transport in the study area, the models haven’t been assessed has produced a good result, it will definitely solve the transport of Thermotolerant transport in the study area.

Keywords: Model prediction, Thermotolerant, Aquiferious zone, Isiokpo rivers
Predictive model to monitor rate of dissolved chromium in soil and water influenced by permeability and linear velocity in phreatic aquifers

Predictive model to monitor rate of dissolved chromium in soil and water influenced by permeability and linear velocity in phreatic aquifers

Authors: S.N. Eluozo| Subaka Nigeria Limited Port Harcourt Rivers State of Nigeria
Year: 2013, Volume: 2, Number: 1
(58 downloads)
Abstract

Predictive model to monitor the rate of dissolved chromium influenced by linear velocity and permeability has been developed, the model were developed to monitor the rate of traced metal chromium in phreatic aquifers, dissolved chromium were found to deposit dynamic concentration at different depth and time The influence of the migration are from the stratification of the soil influence by porosity and permeability, the theoretical values were compared with experimental results form other locations; both parameters compared favourably well. Chromium were found to dissolve with respect to change in concentration with time and distance in some locations, while in rapid increase were experienced in the last two locations. This condition implies that dynamic deposition of permeability and linear velocity influence the variation of concentration; those locations were the concentration deposit high concentration can be attributed to high degree of permeability of the formation, the model is imperative because it will monitor the rate of dissolved chromium in phreatic aquifers.

Keywords: Predictive Model, Chromium, Soil and water
Dispersion influence from void ratio and porosity on E. coli transport in homogeneous soil formation in coastal area of Degema, rivers state of Nigeria

Dispersion influence from void ratio and porosity on E. coli transport in homogeneous soil formation in coastal area of Degema, rivers state of Nigeria

Authors: S.N. Eluozo| Department of Civil Engineering, Faculty of Engineering, University of Nigeria Nsukka.
Year: 2013, Volume: 2, Number: 1
(55 downloads)
Abstract

Dispersion of E.coli transport in homogeneous fine and coarse soil in coastal area of degema has been examined. The transport of E.coli where confound to have deposited in coastal formation, through the predominant of alluvium deposition in the study location, shallow aquifers where also confirmed to deposit at the study area, the influence from high degrees of porosity where confirmed to have play a major role in the dispersion of the contaminants in the study location. The study is imperative because these source of transport are through the flow path in the soil resulting to the spread of the contaminants, dispersion where found to occurred through high degree of porosity and void ratio in the study area, this condition where found to increase the concentration of the microbes in some of the region, the degradation of the microbes in these condition can only take place when there is an inhibition that will reduce the concentration to the standard, where the microbial meets world heath organisation standard, these confirms that quality of water can be abstracted those aquiferious zone, voids ratio and porosity variation in there degree of deposition are through the stratification of the soil ,under the influence of geological formation of the study area, the study can be applied as a bench mark to determine the rate .of dispersion ,on the study location.

Keywords: Dispersion, E. coli transport in homogeneous, Formation
Establishments of porosity model and evaluation to monitor the effect on c to ground water aquifers in port harcourt

Establishments of porosity model and evaluation to monitor the effect on c to ground water aquifers in port harcourt

Authors: S.N. Eluozo| Subaka Nigeria Limited Port Harcourt Rivers State of Nigeria.
Year: 2013, Volume: 2, Number: 2
(51 downloads)
Abstract

Model establishment and calibration of porosity to monitor the effect of shigella migration to groundwater aquifer has been examined. These calibrations were to establish the model that will determine the influence of porosity at various depths on the migration influence of shigella in the study areas. Standard laboratory experiment was done to determine their various degree of porosity. The figures presented established the highest degree at 5 metres in Lateratic soil. Such result implies that the rate of porosity on fine and coarse formation will definitely increase the porosity rate more than what is deposited at 5 metres. The study from this dimension was able to establish a relationship between the porosity and the solute on the flow rate level on the soil, this were done through the definition of various variables and there roles in the transport of shigella on soil and water, the fluid pass through the pore space between the intercedes of the soil, so both parameters definitely has a relationship, and such relationship influence the transport of shigella in the study area.

Keywords: Model, Soil, Water, Transport of shigella
Mathematical modeling to monitor physiochemical interaction with e. coli transport in homogeneous fine sand on the application of colloid filtration method in port harcourt, Niger delta of Nigeria

Mathematical modeling to monitor physiochemical interaction with e. coli transport in homogeneous fine sand on the application of colloid filtration method in port harcourt, Niger delta of Nigeria

Authors: S.N. Eluozo| Department of Civil Engineering, Faculty of Engineering, University of Nigeria Nsukka., B.B. Afiibor| Department of Mathematics and Compu...
Year: 2013, Volume: 2, Number: 2
(55 downloads)
Abstract

Excessive usage of different types of chemical constituents through the activities of man has caused a lot of pollution in soil and water environment. The deltaic environment are not left behind, in fact it is an area to be taken as the worst condition in research of groundwater pollution transport in developing nation. This has reflected on high concentration of different types of pollution sources influenced by the activities of man as industrialized environment. Formation characteristics that reflect the deltaic nature of the soil has been expressed in geologic history to be predominant with alluvium deposition with high yield rate of groundwater known as Benin formation. Such condition has generated degradation of water quality in the study area. In line with this conceptual framework mathematical model were developed expressing these variables in the system that influence the migration of E.coli under the influence of physiochemical deposition at various formations. The model will definitely monitor the behaviour of E.coli transport under the influence of these chemical properties in soil and water environment.

Keywords: Pollution, Environment, E. coli tra E.coli transport nsport
Water nutrients dynamics and use of chlorophyll ‘a’ in the determination of primary productivity of AMADI-AMA creek, upper bonny estuary, port Harcourt, Nigeria

Water nutrients dynamics and use of chlorophyll ‘a’ in the determination of primary productivity of AMADI-AMA creek, upper bonny estuary, port Harcourt, Nigeria

Authors: B.B. Otene*| Department of Fisheries and Aquatic Environment,Rivers State University of Science and Technology, Port Harcourt., S.I. Iorchor| Departme...
Year: 2013, Volume: 2, Number: 2
(58 downloads)
Abstract

water nutrients dynamicsand use of chlorophyll‘a’ in the determination of primary productivity of Amadi-Ama creeks wereinvestigated for 2years(January 2009-December, 2010). Water samples collected were analyzed followingthe standard limnological methods of APHA. Data were analyzed using samplestatistical method of mean and subjected to ANOVA for significant difference atp≤0.05.All the parameters investigated exhibited significant differencespatially,temporally and seasonally except nitrate. The estimation of thephytoplankton biomass by chlorophyll ‘a’ ranged from 0.0-4.50mg/l. Theproductivity of the creek measured by chlorophyll ‘a’ increased in the dryseason than the wet season and also highest in station 3.The observedchlorophyll’a’ value of the creek placed it between mesotrophic to eutrophicstatus.It was observed that chlorophyll‘a’ value increased with increase inwater nutrients especially phosphate.

Keywords: Chorophyll ‘a’, water nutrient, Primary productivity, Amadi-Ama Creek, Bonny Estuary, Nigeria
Calibrating the velocity of solute on E. coli transport in Pheratic aquifers in port Harcourt, rivers state of Nigeria.

Calibrating the velocity of solute on E. coli transport in Pheratic aquifers in port Harcourt, rivers state of Nigeria.

Authors: S.N. Eluozo| Department of Civil Engineering, Faculty of Engineering, University of Nigeria Nsukka.
Year: 2013, Volume: 2, Number: 2
(52 downloads)
Abstract

Calibrating the velocity of solute transport in phreatic aquifers has been assessed, the solute velocity of transport established various rate of velocity at different depth in the study area. The study confirm the influence of the flow paths as one of the causes of variation in solute velocity of flow, few area were examined that confirms the influence of stratification of the soil formation, this has played some role on the rate of velocity flow at different depth, formation characteristics like porosity where also observed to have recorded some influence in the stratification of silty and fine sand where the an optimum level where recorded, the lower rate of velocity are where lateritic soil are predominant, few location experience an average mix of lateritic and silty formation as observed in average velocity of those depths. The study is imperative because it has assessed the rate of velocity of solute flow at different formation, this concept will determine the time of solute migration in the study area

Keywords: Velocity of solute transport, Soil, Migration, E. Coli
Spatial and seasonal variability in sediment parameters of Amadi-Ama Ckeek, port Harcourt, Nigeria

Spatial and seasonal variability in sediment parameters of Amadi-Ama Ckeek, port Harcourt, Nigeria

Authors: B.B. Otene| Department of Fisheries and Aquatic Environment, Rivers State University of Science and Technology, Port Harcourt, Rivers State., S.I. Ior...
Year: 2013, Volume: 2, Number: 2
(53 downloads)
Abstract

The spatial and seasonal variability in sediment parameters of Amadi-Ama creek were investigated for 2years (January2009 and December 2010). Sediment samples collected were analyzed following the standard limnological methods of APHA and values subjected to statistical analysis(p<0.05).The study revealed that only temperature did not exhibit spatial significant difference while other parameters such as pH, conductivity, nitrate, sulphate, phosphate and chlorophyll ‘a’ all differed significantly in both years. By the exception of nitrate and phosphate, all other parameters/nutrients exhibited significant difference seasonally. The parameters and nutrients such as pH, sulphate and chlorophyll ‘a’ recorded higher values in the dry season than the wet season while conductivity was higher in the wet season than the dry season. Temperature, nitrate and phosphate values fluctuate during the period of study. The recorded chlorophyll‘a’values placed Amadi-Ama creek between mesotrophic and euthrophic status.

Keywords: Sediment parameters, Variability, Amadi-Ama creek, Port Harcourt, Season
On optimal trajectory in space flight

On optimal trajectory in space flight

Authors: S. Orlov| Petrozavodsk State University, Petrozavodsk, 185001, Russia.
Year: 2013, Volume: 2, Number: 3
(54 downloads)
Abstract

Are investigated a trajectory of new type in distant, space flights unlike usual trajectories of direct flight to heavenly object (Moon) it is supposed to use asymmetry of a gravitational field and to carry out flight bypassing the most power gravitational impact on the spacecraft. It leads to economy of power for 20-30 %.

Keywords: The theory of vortex gravitation, Space flights with an optimum, trajectory
The use of multi metric index for pollution tracing by use of geographic information system

The use of multi metric index for pollution tracing by use of geographic information system

Authors: V. Abbasi*| Department of Fishery & Environment. Gorgan University of Agricultural Sciences and Natural Resources., A. Kamali| Professor of Fisheries...
Year: 2013, Volume: 2, Number: 3
(52 downloads)
Abstract

Aquatic organisms are used extensively in water quality assessment and ecosystem health quantity scale in streams. Mohammad-Abad creek (Golestan Province) is accounting one of the tributary streams of Gorgan-Rood River. In this study, 21 sites were selected along 25 kilometer of stream long according to ingredient pollutants. Sampling took place each 45 days. After segregation and identification of samples, biological indicators (Hillsenhof and MMIF) are used for water quality assessment. Also Multi Metric index are used in Geographic Information System (GIS) area that comprises 5 metric indices. By this way we could compare environmental effects with anthropogenic ones. Results showed that downstream sites had high organic pollution loading. Studied sites in summer, autumn and winter had high water quality level whereas most of sites in spring placed on good level quality. Assessments showed that biological indicators just identify organic pollution traces but multi metric indices can demonstrate both organic pollutions and environmental effects. Totally, use of HFBI and MMIF indices together would be worthy because they are complement of each other in stream ecological assessment.

Keywords: Mohammad-Abad stream, Water quality, Biological indices

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