Environmental Sciences Commons^™

Distribution And Geochemical Speciation Of Pb, Cd, Zn, Cr, And Cu In Sediments Of Major Dams In Uae, Mona Rashed Musabah Al-Alili

Theses

Assessment of availability and mobility is required to predict the behavior of heavy metals in dam's sediments, which hold up rainwater and make use of them. Therefore, a total number of ninety-three of sediments samples collected from the major dams AI-Shuweib, AI-Bih, AI-Tawiyeen and Ham dam were analyzed by several sedimentological and geochemical analyses procedures for Cu, Cd, Cr, Pb, Zn, AI, and Fe. The samples were investigated for mineralogy using X-ray diffraction analyses for non-clay and clay fractions. ICP-OES and Atomic Absorption Spectrophotometer (AAS) were used to measure the concentration of heavy metals. The statistical treatments and graphical presentations …

Modelling Hydrocarbons Transport In The Aquifer Of Bu Hasa Field And Evaluation Of Remediation Alternatives, Nawal Eisa Saleh Al Junaibi

Theses

The release of non-aqueous phase liquids (NAPLs) to groundwater reservoirs is a serious and widespread environmental problem. In 2000, free phase hydrocarbon was discovered in Liwa aquifer under Bu Hasa Liquid Recovery Plant (LRP). Liwa aquifer is a shallow unconfined aquifer and represents the main water supply in the camp area of Bu Hasa field. Dissolved benzene is observed in at least one observation well in the site. This research is conducted to simulate the fate and transport of the dissolved benzene plume in the groundwater of Liwa aquifer using the finite element model (METABIOTRANS).

The mam objective of this …

Measurements And Control Of Noise Pollution From Dual Fuel Engine, Abdullah Ahmed Jawi Al Aseery

Theses

This study examines the effects of adding the water to the intake air of a dual fuel engine on the performance and combustion noise. Dual fuel engine is a diesel engine using small amount (5%) liquid diesel fuel as a pilot fuel and burns a liquefied petroleum gas as the main fuel. The addition of water to the combustion chamber has known effects on reducing the dangerous emission of nitrogen oxides. Previous research has attributed the observed reduction of nitrogen oxide emissions to a suppression of flame temperature due to quenching effects from the water, thereby reducing thermal NO_{x …}

Treatment Of Industrial Wastewater Containing Active Pharmaceutical Ingredients With A Membrane Bioreactor, With The Aim Of Reducing Resource Consumption, Pádraig Colm Ó'Maolcatha

Theses

The biodegradation of a selected active pharmaceutical ingredient (API) during wastewater treatment in a membrane bioreactor (MBR) was examined experimentally. A comparison study was conducted by operating a conventional activated sludge (CAS) pilot plant in parallel to the MBR. The MBR was operated under varying conditions of pH (pH6 and pH8), MLSS (6g/L and l0g/L) and SRT (20 days and 30 days) according to a full factorial design of experiments. In the CAS, pH and SRT were altered as above but MLSS was maintained at 3-4g/L. Comparable average API removal results of 95.5% and 95.7% were obtained for the MBR …

The Application Of Lc-Ms Technologies For The Detection Of Triazine Herbicides In Water, Michael Cahill

Theses

The triazine herbicides, including, simazine (6-chloro-N,N’-diethyl-1,3,5-triazine-2,4- diamine), atrazine (2-chloro-4-ethylamino-6-isopropylamino-l,3,5-triazine) and cyanazine were developed as selective weed killers. Their design function is to disrupt the photosynthesis of broad-leafed plants. In the intensive production of grasses (e.g. wheat, cereals, etc.) broad-leafed plants growing in the grass production area are economically costly, competitors with the grasses for nutrients; their removal is facilitated by triazines herbicides and simazine and atrazine are the predominant compounds used. Significant amounts of triazine herbicides are consumed by the agricultural industry each year. However, due to the indiscriminate use of pesticides/herbicides, traces of herbicides have been found in run-off …

Assessment Of Noise Impact Of Air Traffic At Dubai International Airport, Maryam Ali Ahmad Al Balooshi

Theses

The aviation industry in UAE has experienced rapid expansion over the past decade due to increase in economic growth and technological advancements. UAE’s total fiscal investment on airport development over the coming 20 years is estimated to exceed Dh 71 billion (US$19.35 billion). Civil aviation now a day is considered one of the greatest environmental concerns which lead to many different environmental problems. The International Aviation Organization (ICAO) secretariat considered aircraft noise as the most significant cause of adverse community reaction relating to the operation and expansion of airports. This is expected to remain the case in most regions of …

Methyl Bromide Alternatives For Post-Harvest Disinfestation Of Dates, Shamsa Hareb Al-Dhahery

Theses

Methyl bromide is a highly effective fumigant to control infestation of dates by insects such as saw-toothed grain beetle, Oryzaephilus surinamensis. The use of methyl bromide will be phased out by 2015 due its adverse effects on Ozone layer. Therefore, environmentally friendly and cost-effective alternatives for controlling insects in dates during storage are needed. Such a treatment should not degrade quality of dates.

The objective of this study was to investigate the effectiveness of conventional heating, freezing, and microwave heating as alternatives to methyl bromide fumigation and to determine the effect of these treatments on date’s quality. Date samples …

Effect Of Oilfield Brine On Groundwater Quality In Marmul Area, Sultanate Of Oman, Salim Ahmed Sakroon

Theses

During a period of 28 years, more than 96 million m³ of oilfield produced water was re-injected in the shallow aquifer at Marmul oilfield area, and changed groundwater characteristics. The 10 wells of Shallow Water Disposal (SWD) have been used to inject water in shallow groundwater aquifers of Dammam and Rus formations. The disposal of oilfield produced water to shallow aquifer has been continuing since 1980, with approximately 96 Mm³ of produced water having been disposed and an estimation of approximately 9600 m³ oil has been disposed of in this case until the beginning of 2008.

The …

Flow In Porous Media And Environmental Impact, Noujoud M Jawhar

Theses

No abstract provided.

Sttructure-Function Correlations Of The Antagonist Effects Of Flavonoids Present In Medicinal Plants On Oxidative Reactive Molecules, Deema Khalil Al Jayousi

Theses

Flavonoids are phenolic compounds with significant antioxidant properties. The propensity of a flavonoid to inhibit free-radical mediated events is governed by its chemical structure. Since these compounds are based on the flavan nucleus, the number, positions, and types of substitutions influence radical scavenging and chelating activity. The main objective of this thesis was to establish structure-activity relationships of flavonoids by means of experimental and computational techniques.

Initially, a series of dietary flavonoids belonging to the most representative families (flavonols; myricetin, quercetin, morin, kaempferol, and 3-hydrxoyflavone, flavones; flavone and flavanones; naringenin) were studied during the reaction with DPPH radical following addition …

Evaluation Of Nutrient (Protein) – Organism (Fish) Relationship Using A Saturation Kinetic Model, Zainab Saad Abdul Rahman

Theses

The primary objective of this thesis was to demonstrate that the net nutrient (protein) deposition and weight gain as a function of nutrient (protein) intake fits the Saturation Kinetic Model and utilize the model parameters to describe and predict intake-deposition relationship.

Groups of Nile tilapia, Oreochromis niloticus, fry (0.01 g) and small fingerlings (0.15 g) were each separately fed twelve semi purified diets in triplicates to the fingerling and duplicate to the fry trial. Each test diet contains a percentage of protein. Protein levels were 0, 5, 10, 15, 20, 25, 30, 35, 40, 45, 50 and 54 percent …

Removal Of Selected Heavy Metals From Wash Water Generated From Ready-Mix Concrete Trucks, Dubai, Uae., Imad Juma Mohammed Abunqira

Theses

Dubai is one of seven Emirates that form the United Arab Emirates. The Emirate of Dubai is currently undergoing a fast-paced construction boom that involves huge amounts of concrete mixes. Such mixes are usually delivered to the site in ready form. The major environmental issue with ready-mix concrete production around the world is water pollution. The wash water generated from ready-mix concrete trucks is extremely alkaline and contains significant levels of heavy metals. Removal of heavy metals from the wash water is an environmental problem and economic concern. This demonstrates the urgent need for safe, feasible and economical methods for …

Biological Control Of Fusarium Oxysporum Wilt Disease Of Tomato By Antagonistic And Plant Growth Promoting Actinomycetes, Nada Mohammed Ibrahim Al-Shugairan

Theses

Soil-borne fungal plant pathogens cause some of the most widespread and serious plant diseases. Root diseases caused by these pathogens such as wilt, root rot, collar rot, foot rot, seedling pre- and post-emergence damping-off are the foremost of problems which are gaining importance from day to day in the world and for which no direct control measures have been evolved so far. Fusarium spp. is a widespread soil-borne plant pathogen and is the causal agents of wilt disease of many economically important crops. Fusarium spp. is a limiting factor in the plant productivity in most agricultural soils. Wilt disease of …

Assessment Of Marine Pollution Along Qatar’S Coasts, Mariam Saud Sadoon Al-Adba

Theses

In 2006 a study was carried out to evaluate organic and petroleum pollutants including: Total Organic Carbon (TOC), Total Petroleum Hydrocarbon (TPH), Total Kjeldahl Nitrogen (TKN), Polycyclic Aromatic Hydrocarbons (PAHs) and PolyChlorinated Biphenyls (PCBs) in coastal bottom sediments of Qatar, as well to determine the source of petroleum pollutant in the environment.

The study included 15 stations along the coastline, at a 100 m distance from the shoreline. The average TOC % analyzed in the study area is 0.262 % which is less than other regional studies. The average TPH in Qatar sediment is around 133.46 mg/kg; this is lower …

Electrical Imaging Hydro Chemical And Isotope Investigation Of Mubazarah Area In Uae (Al-Ain), Faris Mirghani Mahgoub

Theses

No abstract provided.

Assessment Of Favorable Conditions And Potentials Of Salinity Gradients In Solar Ponds (Sgsps) And The Production Of Solar Salt Along Abu Dhabi Coasts, Huda Ali Mohammed Saeed Al Mansouri

Theses

Coastal sabkha area of Abu Dhabi extends about 300km long and 15 km wide. It consist of a series of hypersaline (47%) lagoons surrounded by salt-entrusted flat sabkhas. Temperature there may reach 60° C in the summer. Moreover, the salinity of the lagoons is very high and may reach 70%.

The objective of this study was to assess the possibility of utilizing salinity gradient in solar ponds and/or production of solar salt along Abu Dhabi coasts. This study was conducted in sabkha area which extends from Al Mafraq-Al Sil’a Highway, near the Satellites Station (kilo 255, Dy 17 Street) until …