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Volume

Volume number
2
Publication year
2000

Central Composite Design in a Refinery’s Wastewater Treatment by Air Flotation

by

Rigas F., Panteleos P. and Laoudis C.

General

Water resulting from the dewatering process of petroleum storage tanks was treated in a pilot separator to investigate the effectiveness of the combined action of a coagulant (aluminum sulfate) and a cationic flocculant (NALCO 71403). Central composite design of experiments was used to construct...

Optimization bench-scale separator +2 more

Metal Speciation Studies in a Brakish/Marine Interface System

by

Scoullos M. J. and Pavlidou A. S.

General

The paper presents some interesting results of metal speciation studies employing Anodic Stripping Voltammetry (ASV) applied in a dynamic natural system such as the brakish – marine interface formed between the polluted waters discharged by the Koumoundouros lake and the marine ones of the Gulf of...

Metal speciation Koumoundouros lake +5 more

Observations of the directional spectrum relaxation of wavefields in slowly and rapidly turning winds

by

Tsanis I.K. and Brisette F.

General

A so called “Exact Form” of the Maximum Likelihood Method is used to obtain directional spectrum estimates from a 3-meter NDBC discus buoy, part of the Surface Wave Dynamics Experiment (SWADE) field array. The method was used to look at the response of wavefields to turning winds with various wind...

water waves directional spectra +3 more

Neural Networks for Environmental Problems: Data Quality Control and Air Pollution Nowcasting

by

Benvenuto F. and Marani A.

General

This work illustrates the use and some related results of Artificial Neural Networks (ANNs) for data quality control of environmental time series and for reconstruction of missing data. ANNs are applied to the following problems: i) short and medium-term predicting of air pollutant concentrations in...

Artificial neural networks times series nowcasting - forecasting - interpolating - extrapolating.

Management of Resources for Sustainable Development: Entropy "SHOWS" the way

by

Tassios D.

General

The purpose of “Sustainable Development” raises the following basic question: Which “indicator” should be used to identify the human activities that are contrary to this purpose? In this paper it will be shown that “Entropy Generation” constitutes this Indicator. To this purpose, we will use three...

Sustainable development Entropy Generation

Sustainability and regional development: the case of the tourism sector in Southern Europe

by

Modinos M.

General

The present work argues that sustainable tourism is essential to the long-term survival of the tourism industry in Europe. Sustainable tourism may be regarded as a means of redressing economic imbalances between European regions and nations without producing adverse environmental, social and...

Environmental planning natural resources and ecosystems management +3 more

Physical and Chemical Characteristics of a Mediterranean Coastal Microenvironment: The "Salty Lake" of Aghios Nikolaos (Crete, Greece)

by

Mihopoulos N., Dassenakis M., Anastasakis G. and Scoullos M.

General

The present paper examines a small and deep (53 m) salty lake, as well as the adjacent harbor of Aghios Nikolaos (Crete). The survey was carried out in 1996. Physicochemical parameters indicated that the main characteristics of the system are the inflow of karstic water from underwater springs...

Marine coastal environment lake +3 more

Gas injection into aeration tanks

by

Latsa M., Stamou A., Markatos N. and Assimacopoulos D.

General

Aeration is one of the most common stages in the liquid waste clarification process. Most aeration tanks are equipped with aeration devices that inject oxygen to enhance the biodegradation of the liquid waste. In this work an aeration process is simulated, where the air is injected from the bottom...

Aeration tank gas-injection +1 more

European Policy on Port Environmental Protection

by

Goulielmos A.M.

General

Ports are part of the logistics chain and the transport networks, with a decisive role in the protection of the sea environment. In the present work, the environmental protection of ports is defined as a problem in the transport sector and within the marine environment. Port pollution and its causes...

Port environmental protection Port environmental policies +1 more

Atmospheric flow and dispersion through arrays of obstacles

by

Mavroidis I.

General

Field experiments have been conducted to investigate flow and dispersion through obstacle arrays. Model obstacles which represent real structures at a nominal scale between 1/10 and 1/20 were used. The main purpose of the experiments was to examine flow and dispersion of contaminants in the vicinity...

buildings plan area density +3 more