OIL POLLUTION STUDIES ON LAKE MARACAIBO. VENEZUELA

1975 ◽  
Vol 1975 (1) ◽  
pp. 489-496 ◽  
Author(s):  
W.L. Templeton ◽  
E.A. Sutton ◽  
R.M. Bean ◽  
R.C. Arnett ◽  
J.W. Blaylock ◽  
...  
Keyword(s):  
Water Quality ◽  
Lake Water ◽  
Oil Pollution ◽  
Surface Films ◽  
Fishery Resources ◽  
Lake Maracaibo ◽  
Commercial Species ◽  
Potential Impact ◽  
High Concentrations ◽  
The Impact

ABSTRACT The results of a 2-year study on the impact of oil discharges on the fishery resources of Lake Maracaibo, Venezuela, are presented. The lake system is described, together with relevant water quality, hydrographic, ecological, and fishery resources data. Sources of other types of pollution, domestic and industrial, are described, and their potential impact on the system are discussed. Analysis of environmental samples-water, sediments, and biota-showed low concentrations of oil in lake water and no detectable accumulation of petroleum-derived hydrocarbons in muscle tissue of selected commercial species. The occurrence of bituminous materials in the sediments, particularly in the oil production area, suggests that the natural processes of volatilization, biodegradation, and sedimentation are the major mechanisms for the removal of oil from the surface waters. Laboratory studies on the toxicity of oil indicate that relatively high concentrations of oil are required to cause mortality. Extraction of oil with lake water, however, indicated that concentrations of total light aromatic fractions were toxic in the parts per million range. The rapid loss, in a few hours, of light hydrocarbons from surface films of oil to the atmosphere was shown to reduce the toxicity to organisms significantly. Examination of the limited fisheries data available does not suggest that the resources are being depleted. However, consideration of the potential impact of nonpetroleum wastes indicates that they are contributing to the degradation of the water quality which, if unchecked, may subsequently reduce the biological resources of the lake.

scholarly journals Spatial Variation of Water Chemistry in Aries River Catchment Western Romania

2021 ◽  
Vol 11 (14) ◽  
pp. 6592
Author(s):  
Ana Moldovan ◽  
Maria-Alexandra Hoaghia ◽  
Anamaria Iulia Török ◽  
Marius Roman ◽  
Ionut Cornel Mirea ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Water Quality ◽  
Water Chemistry ◽  
Water Samples ◽  
Mine Drainage ◽  
Pollution Indices ◽  
Mining Activities ◽  
River Catchment ◽  
High Concentrations ◽  
The Impact

This study aims to investigate the quality and vulnerability of surface water (Aries River catchment) in order to identify the impact of past mining activities. For this purpose, the pollution and water quality indices, Piper and Durov plots, as well vulnerability modeling maps were used. The obtained results indicate that the water samples were contaminated with As, Fe, Mn, Pb and have relatively high concentrations of SO42−, HCO3−, TDS, Ca, K, Mg and high values for the electrical conductivity. Possible sources of the high content of chemicals could be the natural processes or the inputs of the mine drainage. Generally, according to the pollution indices, which were correlated to high concentrations of heavy metals, especially with Pb, Fe and Mn, the water samples were characterized by heavy metals pollution. The water quality index classified the studied water samples into five different classes of quality, namely: unsuitable for drinking, poor, medium, good and excellent quality. Similarly, medium, high and very high vulnerability classes were observed. The Durov and Piper plots classified the waters into Mg-HCO3− and Ca-Cl− types. The past and present mining activities clearly change the water chemistry and alter the quality of the Aries River, with the water requiring specific treatments before use.

scholarly journals Effect of Maritime Traffic on Water Quality Parameters in Santa Marta, Colombia

2021 ◽  
Vol 9 (5) ◽  
pp. 474
Author(s):  
René Rodríguez-Grimón ◽  
Nestor Hernando Campos ◽  
Ítalo Braga Castro
Keyword(s):  
Water Quality ◽  
Petroleum Hydrocarbons ◽  
Quality Parameters ◽  
Water Quality Parameters ◽  
Maritime Traffic ◽  
Natural Park ◽  
High Concentrations ◽  
The Impact ◽  
The Relationship ◽  
Multiple Chemical

Since 2013, there has been an increase (>23%) in naval traffic using maritime routes and ports on the coastal fringe of Santa Marta, Colombia. Of major concern, and described by several studies, is the relationship between maritime traffic and coastal contamination. This study proposed a maritime traffic indicator considering the simultaneous effects of several relevant measurements of water quality parameters to estimate the impact of naval activity. The approach involved developing a model including the number of vessels, hull length, and permanence time in berths. In addition, water quality variables, considering climatic seasons, were used to verify association with maritime traffic and touristic activities. The high concentrations of total coliforms (TC) and dissolved/dispersed petroleum hydrocarbons in chrysene equivalents (DDPH) reported by the International Marina of Santa Marta (SM) were affected by the local anthropic activities, including tourism, naval traffic, and urban wastewater discharges. Moreover, our results suggest the occurrence of multiple chemical impacts within Tayrona National Natural Park (PNNT) affecting conservation goals. The estimation of the maritime traffic indicator proposed in this study may be an easy and more complete tool for future studies evaluating the impact of naval activities on environmental quality.

scholarly journals Impacts of Leachate Percolation on Ground Water Quality: A Case Study of Dhanbad City

2015 ◽  
Vol 17 (1) ◽  
pp. 162-174 ◽  
Keyword(s):  
Water Quality ◽  
Ground Water ◽  
Oxygen Demand ◽  
Quality Analysis ◽  
Solid Waste Disposal ◽  
Ground Water Quality ◽  
Potential Health ◽  
Groundwater Samples ◽  
High Concentrations ◽  
The Impact

<div> <p>This paper presents an assessment of the impact of uncontrolled and unscientific disposal of MSW on ground water in Dhanbad city, India. In this study, ground water quality around municipal solid waste disposal sites was investigated. Ground water quality analysis was carried out on samples collected at various distances from two disposal sites. The study has revealed that the ground water quality near dumping sites does not conform to the drinking water quality standards as per IS:10500. The impacts of indiscriminate dumping activity on ground water appeared most clearly as high concentrations of total dissolved solids, electrical conductivity, chlorides, chemical oxygen demand, and sulphates. High amount of metals like Na, K, Ca, Mg, Cd, Cu, Ni, Fe, Zn and Mn has also been detected in the groundwater samples near dumping area. Leachate characterization study also reveals high potential for groundwater contamination. Presence of feacal coliform contamination in groundwater samples indicates potential health risk for individuals exposed to this water.&nbsp;</p> </div> <p>&nbsp;</p>

scholarly journals Impact of network sectorisation on water quality management

2017 ◽  
Vol 20 (2) ◽  
pp. 424-439 ◽  
Author(s):  
Hooman Armand ◽  
Ivan Stoianov ◽  
Nigel Graham
Keyword(s):  
Water Quality ◽  
Large Scale ◽  
Water Quality Management ◽  
Cost Effective ◽  
Pressure Control ◽  
Supply Networks ◽  
Potential Impact ◽  
And Control ◽  
The Impact ◽  
Hydraulic Variables

Abstract The sectorisation of water supply networks (WSNs) includes the permanent closure of valves in order to achieve a cost-effective leakage management and simplify pressure control. The impact of networks sectorisation, also known as district metered areas (DMAs), on water quality and discolouration has not been extensively studied and it remains unknown. In addition, hydraulic variables used in the literature for assessing the likelihood of potential discolouration are limited and inconclusive. This paper investigates a methodology to evaluate the impact of networks sectorisation (DMAs) on water quality and the likelihood of discolouration incidents. The methodology utilises a set of surrogate hydraulic variables and an analysis of the hydraulic condition in pipes with historic discolouration complaints. The proposed methodology has been applied to a large-scale WSN, with and without sectors, in order to assess the potential impact of DMAs on water quality. The results demonstrate that the sectorisation of WSN (DMAs) could compromise the overall water quality and increase the likelihood of discolouration incidents. The results of this study and the proposed surrogate hydraulic variables facilitate the formulation of optimisation problems for the re-design and control of WSNs with sectorised topologies.

scholarly journals Impacts of Agrochemicals on Water Quality Parameters in Aboisso Region (South-East of Cote d’Ivoire)

2020 ◽  
pp. 1-19
Author(s):  
Assouman Amadou ◽  
Kpan Oulai Jean- Gautier ◽  
Gnamba Franck Maxime ◽  
Oga Yéï Marie Solange ◽  
Biémi Jean
Keyword(s):  
Water Quality ◽  
Surface Water ◽  
Physicochemical Analysis ◽  
Quality Parameters ◽  
Human Consumption ◽  
Quality Of Water ◽  
Lambda Cyhalothrin ◽  
High Concentrations ◽  
Guide Values ◽  
The Impact

Aboisso region is experiencing unprecedented agricultural activities. Cultural techniques such as the use of insecticides are harming the quality of water. This study aims to assess the impact of insecticides on the water quality in the Aboisso region. Thirty-one (31) water points (10 surface water and 21 groundwater) were sampled. The determination of physicochemical parameters as well as the multi-residue method used for insecticides analysis in the samples allowed us to achieve our objective. The result of the physicochemical analysis shows that the temperature of groundwater (27.91°C) is higher than surface water temperature (26.77°C). These waters are mostly acidic with a slightly lower pH for groundwater (6.46) compared to surface water (6.54). The conductivity is higher in groundwater (average of 130.46 µS/cm) as opposed to surface water (average of 43.50 µS/cm). After applying the multi-residue method, the results reveal the presence of nine (9) active ingredients. In surface waters, all these molecules, except Lambda-cyhalothrin and Deltamethrin, exceed the WHO guide values (0.1 µg/L). The highest concentrations recorded concern ethyl parathion and profenofos (8.24 µg/L and 8.04 µg/L respectively). In groundwater, it is rather Parathion-methyl, Profenofos, Dimethoate, Chlorpyriphos-ethyl, Lambda-cyhalothrin and Deltamethrin that are often at below WHO standards. However, the present study reveals that all of the water samples analysed were polluted, owing to anthropogenic used of insecticides in the region, and other chemicals with high concentrations of parathion-ethyl: 8.24 µg/L and profenofos: 8.04 µg/L. These waters are therefore unfit for human consumption.

scholarly journals Correction: Li, J.; et al. The Impact of Lake Water Quality on the Performance of Mature Artificial Recharge Ponds. Water 2019, 11, 1991

Water ◽  
2020 ◽  
Vol 12 (6) ◽  
pp. 1713
Author(s):  
Jing Li ◽  
Kristofer Hägg ◽  
Kenneth M. Persson
Keyword(s):  
Water Quality ◽  
Lake Water ◽  
Artificial Recharge ◽  
Lake Water Quality ◽  
The Impact

The authors wish to make the following corrections to this paper [...]

scholarly journals Hydrochemical Assessment of Groundwater around Lapite Dumpsite for Irrigation Water Quality in Ibadan, Southwestern Nigeria

2021 ◽  
Vol 8 (2) ◽  
pp. 98-108
Author(s):  
Oluwatoyin Opeyemi Akintola ◽  
Gabriel Oladapo Adeyemi ◽  
Adewunmi Idayat Bodede ◽  
Oluwatoyin Adekoya ◽  
Kehinde O. Babatunde
Keyword(s):  
Water Quality ◽  
Irrigation Water ◽  
Water Samples ◽  
Stream Water ◽  
Magnesium Content ◽  
Resource Assessment ◽  
Irrigation Water Quality ◽  
Southwestern Nigeria ◽  
High Concentrations ◽  
The Impact

Due to the increase in population and industrialization growth, most countries in the world depend on groundwater to meet agriculture demands for food production. The increase in water contamination due to indiscriminate solid wastes has necessitated the assessment of water quality and its suitability for agricultural usage. Twenty four groundwater and ten stream water samples were randomly collected from the downslope and upslope side of the dumpsite for all the major physio-chemical parameters. The pH of water samples indicates slightly acidic to alkaline in nature. High concentrations of nitrate, total dissolved solids and electrical conductivity suggest the impact of the waste on the water resource. Assessment of irrigation water quality based on Sodium Adsorption Ratio (SAR), Soluble Sodium Percentage (SSP), Permeability Index (PI) and Magnesium content (MC) indicated that most of the water samples fall within the permissible standard for irrigation water. Thus, the water should be used with caution on crops for long time agricultural sustainability.

scholarly journals Impact of Right Bank Outfall Drain-I (RBOD-I) / Main Nara Valley Drain (MNVD) on Manchar Lake, Sindh, Pakistan

2019 ◽  
Vol 9 (6) ◽  
pp. 5074-5079
Author(s):  
A. A. Mahessar ◽  
K. Ansari ◽  
G. M. Arain ◽  
S. M. Kori ◽  
S. Qureshi ◽  
...  
Keyword(s):  
Water Quality ◽  
Water Supply ◽  
Lake Water ◽  
Polluted Water ◽  
Mountain Range ◽  
Indus River ◽  
Lake Water Quality ◽  
The Right ◽  
The Impact ◽  
Manchar Lake

The lakes of Sindh are in poor environmental condition due to the massive disposal of effluents. This paper presents the impact of water quality in Manchar Lake due to climate change and anthropogenic intervention. The lake is one of the biggest natural lakes in Sindh, Pakistan. The lake has three major sources of water supply: Indus River, hill torrents from the Khirthar Mountain range and the Right Bank Outfall Drain (RBOD-I)/Main Nara Valley Drain (MNVD). The water supply of the lake from the first two sources has been reduced due to morphological and climate changes. Hence, there is only one, and polluted, water supply to the lake, the RBOD-I/MNVD. At the same time, the use of poisonous materials for fishing has further contaminated the lake’s water. The RBOD system is connected with RBOD-III, RBOD-I/MNVD, Indus Link and RBOD-II on the right side of Indus River for safe disposal of wastewater into the Arabian Sea, which is still not functioning. Hence, more than 4500 cusecs of wastewater from the catchment area of RBOD have directly been discharged into the lake causing severe impact on flora, fauna and the livelihood of locals. In order to analyze the lake water quality impact, the water quality index (WQI) model was used. The results indicate that the water quality of four samples was very poor, while the fifth sample was unsuitable for drinking. The results of statistical analysis of parameters such as TDS, EC, SO4, Cl, Na, and hardness are higher to their permissible limits. Consequently, lake water possesses a high potential risk to local consumers and aquatic ecology.

An assessment of water quality in a coastal embayment (Phaleron Bay, Greece)

1995 ◽  
Vol 32 (7) ◽  
pp. 25-32 ◽  
Author(s):  
A. J. Theodorou
Keyword(s):  
Water Quality ◽  
Environmental Management ◽  
Water Column ◽  
Chlorophyll A ◽  
River Discharge ◽  
Benthic Communities ◽  
Coastal Embayment ◽  
Oceanographic Data ◽  
High Concentrations ◽  
The Impact

Athens basin drains by gravity to the coast into the Phaleron Bay by the Kifissos river. The Phaleron coast is currently undergoing extensive remodelling and is scheduled for development as a major amenity and recreational centre. Thus, an assessment of the Phaleron Bay's present water quality constitutes a prerequisite for the future environmental management of its waters. Analysis of oceanographic data, collected during 1989–1990, showed that eutrophic conditions prevail in the vicinity of Kifissos river, where nutrients and chlorophyll-a occur in high concentrations. Also in this area, the benthic communities have been modified and they are dominated by detritus or sediment feeding polychaetes. However, beyond this region the impact of the river discharge diminishes with distance offshore and in the entrance of the bay, both water column quality and benthos are indistinguishable from those of the open Saronikos Gulf.

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