This paper presents the outcomes of a study on the water quality of Dubai Creek which aimed to assess its eutrophication status. Field water quality data from stations along the creek collected in 2012 and 2013 were used. Ordinary least squares (OLS) and spatial autocorrelation analyses were used as part of geographic information system (GIS)-based exploratory regression analysis to study the relationship between chlorophyll-a and nutrients, specifically total nitrogen and phosphate. Multiple logistic regression analysis was used to study the vulnerability of the creek to eutrophication. Results showed unique trends of spatiotemporal variability of chlorophyll-a and nutrients. OLS modeling showed high correlation between field and modeled chlorophyll-a values between Al Garhoud Bridge and Sanctuary stations, located about 2 km upstream and downstream of the Sewage Treatment Plant (STP) Outfall station. Furthermore, results showed the lower half of the creek was more vulnerable to eutrophication than the upper, which was believed to be due to the location of the STP station, poor flushing, shallow water depth, and irregular circulation patterns in the creek. Accordingly, this study recommends development of a mitigation plan in order to control the levels of nutrients in the creek.
Background and purpose
The IRENA operation (Indicator Reporting on the Integration of Environmental Concerns into Agriculture Policy) is a joint exercise between several Commission directorates-generals (DG Agriculture and Rural Development, DG Environment, Eurostat and DG Joint Research Centre, and the European Environment Agency (EEA) to develop agri-environmental indicators for monitoring the integration of environmental concerns into the common agricultural policy (CAP) in the European Union (EU-15). It is a...
The control and prevention of nutrient pollution from fish farming plays an essential role in the French regulatory framework. Assessing nutrient emissions from fish farms is important in terms of farm authorization, taxation, and monitoring. Currently employed strategies involve both water sampling and empirical modeling. This article reports the work and outcomes of an expert panel that evaluated existing methodologies and their possible alternatives. The development and evaluation of a nutrient-balance...
Up to now, the recovery of precious metals used as catalysts in chemical processes has involved the use of incineration. Now, however, a British-Swedish joint venture has developed a process which uses supercritical water oxidation instead, which provides many economic and environmental advantages.
Precious metals are used extensively in catalysts in a wide range of industrial chemical processes. Sometimes they are used in a homogeneous form, but more often fixed to a solid support for ease of handling. In many...
The Kemwater Recycling Process – KREPRO for treatment of sewage sludge is based on a completely new separation technology, which uses existing knowledge in an innovative way. It reduces both the organic and inorganic content of the sludge. The organic content is re-duced by about 30% and the inorganic about 70% if digested sludge is treated. All metals and salts are dissolved; the remaining undissolved inorganics are mainly silicates like sand and grit.
In constast, most sludge treatment technologies used today...
Overview
In the UK, numerical Hydraulic Modelling of the urban environment, water networks and rivers plays a vital role in providing the UK Water Industry with solutions for protecting the environment, meeting UK Government and European Regulations, meeting OPEX and CAPEX business targets, and improving the efficiency of Water Companies in managing their assets.
Similarly, the UK water industry has invested heavily in GIS and asset databases. But until recently these have been under utilised by the modelling...
Over the last ten years computer technology and network modelling software have developed beyond all recognition, providing the necessary hardware and software tools to assist water distribution engineers in their design and planning work utilising fully dynamic all-mains models. However, many water supply companies still make important decisions based on static models that represent an arbitrary simplification of the network and probably contains incomplete and inaccurate demand information. The commercial...
Geographic Information Systems (GIS) hold great potential as a tool for managing environmental site remediation data. While noting the location of contaminated sites in GIS is commonplace, GIS has played only a minor role in review and analysis of chemical data gathered during an investigation or monitoring activity. The New Jersey Department of Environmental Protection Site Remediation Branch (NJDEP SRP) has undertaken a project making the use of GIS for this purpose a reality within their organization. Through...
Abstract
Waste represents an enormous loss of resources both in the form of materials and energy. Indeed, quantities of waste can be seen as an indicator of the material efficiency of society. Waste generation is increasing in the European Union, and amounted to about 3.5 tonnes of solid waste per person in 1995 (excluding agricultural waste) 1
Excessive quantities of waste result from:
inefficient production processes low durability of goods unsustainable consumption patterns. Solid waste is also increasingly...
`The oceans are in trouble and so are we,` oceanographer Sylvia Earle, National Geographic explorer in residence and researcher for the Smithsonian, was quoted as saying in an article on the web by Seth Borenstein writing for the Philadelphia Inquirer and San Jose Mercury News Washington Bureaus. Citing a study by the Harvard Medical School`s Center for Health and the Global Environment covering 1976 to 1996, Borenstein reports a greater than fourfold increase in harmful algal blooms (74 to 329). `stranding of...
STP ‘De Groote Lucht’ in the Netherlands had to be upgraded in order to meet the tightened criterion for total nitrogen (10 mg/l N as yearly average). ASTRASAND moving bed biofiltration, is introduced for post-denitrification. Pilot plant tests were executed in 1996 and it was found that in order to achieve good filter performance with the specific process conditions, an adequate process control system was required. This filter control ensured removal efficiencies of > 95% with influent concentrations up to 30...
Background
The Printing Office (TPO) is a medium sized print shop employing 15 staff. It specialises in the production of high quality, short run jobs.
In the printing industry, the use of solvents has always been a problem. Whether it is from the point of view of workplace health and safety or from environmental concern, any reduction in the use of solvents is a welcome change. Motivated by these issues, TPO decided to trial a new dampener roller washer system that uses no solvents.
Issue
The offset...
Synopsis
Industry, Fresh Water, and Sustainable Development is published jointly by the World Business Council for Sustainable Development and the United Nations Environment Programme (UNEP).
The growing demands for water for human consumption, agriculture and industry means that fresh water must not be taken for granted, but be carefully used.
Industry has an important part to play in this, and our report looks at what industry is doing to improve and increase the supply and quality of fresh water.
The...
` In order to determine the impacts of a particular discharge on ambient water quality, it is usually necessary to model the diffusion and dispersion of the discharge in the relevant water body. The approach applies both to new discharges and to upgrading of existing sources. This note provides guidance on models that may be applicable in the context of typical Bank projects.`
Introduction
Mathematical models can be used to predict changes in ambient water quality due to changes in discharges of wastewater. In...
Introduction
Surface and subsurface soils have different characteristics in natural attenuation. Mobile contaminants in subsurface soils diffuse into soil vapor and aqueous phase and thus are relatively easily subject to natural subsurface processes that can attenuate these contaminants. Most high-molecular-weight (persistent) organic and many inorganic contaminants will be immobilized in the subsurface soil matrix. These persistent organic contaminants often are difficult to degrade and the inorganic metals are...
In-well vapor stripping technology involves the creation of a ground-water circulation pattern and simultaneous aeration within the stripping well to volatilize VOCs from the circulating ground-water. Air-lift pumping is used to lift ground-water and strip it of contaminants. Contaminated vapors may be drawn off for aboveground treatment or released to the vadose zone for biodegradation. Partially treated ground-water is forced out of the well into the vadose zone where it reinfiltrates to the water table....
Pressures on the environment may occur through chemical, physical and biological agents. The subject of this study is physical agents, where physical fields are examined.
Physical fields are part of the natural environment. Depending upon their properties and the surrounding conditions, physical fields are transmitted through the spaces in which we live, potentially affecting human health and nature. Human activity can add to, modify, and enhance and reduce the intensity of these fields. Furthermore, changes in...
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