Civil and Environmental Engineering Commons^™

Ocena Oddziaływania Na Środowisko Instalacji Spalania Odpadów – Wybrane Problemy, Robert Oleniacz

Robert Oleniacz

The paper presents some problems related to the environmental impact of waste incineration plants with particular emphasis on the impact on air quality and the assessment of this impact carried out for newly built incinerators. Methodology for the calculation of emissions for new plants based on emission standards was proposed. It has been shown that waste incineration plants complying with emission limit values to a negligible extent affect the air quality, especially in the case of units with small capacity.

In the case of polychlorinated dibenzo-p-dioxins and dibenzofurans, due to lack of permissible levels in the air, it was found …

Ocena Oddziaływania Mittal Steel Poland S.A. Oddział W Krakowie Na Jakość Powietrza W Aspekcie Likwidacji Strefy Ochronnej, Marian Mazur, Robert Oleniacz, Marek Bogacki, Przemysław Szczygłowski

Robert Oleniacz

The paper presents results of the air quality impact assessment for Mittal Steel Poland S.A. unit in Krakow (Poland). The assessment included all emission sources working in the unit in 2003 as well as emission sources belonging to companies separated from the steelworks in the past. A special attention was taken to comply of air quality standards in area of the protective zone in connection with their planned liquidation by the end of 2005 (the requirement of the new environmental law).

English title: Evaluation of impact of Mittal Steel Poland S.A. unit in Krakow on air quality in connection with …

Water Intrusion In Base/Subgrade Materials At Bridge Ends, Priyantha Jayawickrama, Phil Nash, Michael Leaverton, Debakanta Mishra

Debakanta Mishra

Departments of transportation spend considerable time and money repairing pavement failures that occur in the base or subgrade materials near bridge ends. Investigation of these failures often reveal saturated base/subgrade materials. The objectives of this research were to determine all possible sources for water intrusion, develop methods to recognize in-the-field causes of water collection at bridge approaches, and to develop new repair methods that can be economically implemented in the field to minimize water intrusion or remove water from soils.

Research focused on existing bridge approaches, concentrated on maintenance techniques to prevent water intrusion at bridge ends, and included an …

Backend Framework And Software Approach To Compute Earthquake Parameters From Signals Recorded By Seismic Instrumentation System, Raman Attri

Raman K. Attri

Computation of seismic parameters and its interpretation from the recorded earthquake signal is empowered by digital data acquisition systems. This enables seismologist to automatically compute all the relevant parameters. Futuristic applications require extensive software development to implement seismic prediction and forecasting models. While developing such models, software developer prefer to write their own in-house analysis & modeling software with complete control over the required computations and models. This paper presents simplified mathematical framework of the seismic events and back-end computational software logic & algorithm to provide a simple framework to software engineers develop customized seismic analysis & computation software.

Non-Contact Detection Techniques And Technologies For Detection Of Objects In Air, Under-Ground And Under-Water, Raman Attri

Raman K. Attri

In this white paper, we will present review and compilation of various object detection techniques currently available in different scenarios and situations. Automatic Object detection in the air, beneath other materials, under water and under the earth surface as well as over the surface is one of the advanced sciences employing many principles of multiple engineering domains together. “See-through” methods – seeing beyond the visible objects, has been inherent desire of human being since the practice of science. Not only this, a craving to detect the objects without directly “seeing upon” them with naked eyes calls upon some automatic procedures …

Stabilization Of Residual Soil With Rice Husk Ash And Cement, Hilmi Mahmud

Hilmi Mahmud

Stabilization of residual soils is studied by chemically using cement and rice husk ash. Investigation includes the evaluation of such properties of the soil as compaction, strength, and X-ray diffraction. Test results show that both cement and rice husk ash reduce the plasticity of soils. In term of compactability, addition of rice husk ash and cement decreases the maximum dry density and increases the optimum moisture content. From the viewpoint of plasticity, compaction and strength characteristics, and economy, addition of 6-8% cement and 10-15% rice husk ash is recommended as an optimum amount. © 2004 Elsevier Ltd. All rights reserved.

Multiple Imputation Scheme For Overcoming The Missing Values And Variability Issues In Its Data, Daiheng Ni, John D. Leonard Ii, Angshuman Guin, Chunxia Feng

Daiheng Ni

Traffic engineering studies such as validating Highway Capacity Manual (HCM) models require complete and reliable field data. However, the wealth of intelligent transportation systems (ITS) data is sometimes rendered useless for these purposes because of missing values in the data. Many imputation techniques have been developed in the past with virtually all of them imputing a single value for a missing datum. While this provides somewhat simple and fast estimates, it does not eliminate the possibility of producing biased results and it also fails to account for the uncertainty brought about by missing data. To overcome these limitations, a multiple …

Small-Scale Structure Of Strongly Stratified Turbulence, Jin Hwan Hwang, Chris R. Rehmann

Chris R. Rehmann

The small-scale structure of turbulence subjected to strong stratification is analyzed with rapid distortion theory to evaluate the performance of formulas for predicting dissipation of turbulent kinetic energy and dissipation of scalar variance. The approach is restricted to weak turbulence in strong stratification, like that in the thermocline or the abyssal ocean. Flows with and without mean shear are considered. For unsheared turbulence, the small scales are axisymmetric about the vertical axis, as others have previously assumed. The calculations here complement and extend previous work because they can be used to compute errors in dissipation estimates, develop simpler formulas, and …

Emisja Zanieczyszczeń Ze Spalania Odpadów Podestylacyjnych Z Produkcji Witaminy C W Piecu Fluidalnym, Robert Oleniacz

Robert Oleniacz

Some results of continuous or periodical measurements of selected air pollutant concentrations and mass streams in the flue gases from liquid waste incineration in a fluidized bed incinerator were presented in the paper. During the researches distillation tails from vitamin C production, that is waste traces from regeneration such solvents as for example ethylene chloride, chloroform or trichloroethylene were incinerated. As a result of the researches there was determined optimal temperature of the fluidized bad in which the waste incineration should be carried out to minimization of CO and NOx formation. Required effectiveness of HCl removal from combustion gases to …

Emisja Zanieczyszczeń Z Procesu Grafityzacji Elektrod Węglowych W Piecach Lwg (Castnera). Cz. 1. Wybrane Substancje Gazowe, Marian Mazur, Robert Oleniacz, Marek Bogacki, Przemysław Szczygłowski

Robert Oleniacz

The results of measurements of quantity pollutants originated and emitted to air from LWG (Castner) furnaces were introduced. The investigation was carried out during the graphitisation process of coal electrodes, until moment of end of ventilation the stove across applied installations of cleaning of cool gases (catalytic burning and the wet desulphurization). The measurement results of CO, CO2, HC+H2, SO2, H2S, CS2, NO, NO2, NH3 as well as chosen hydrocarbons (C1-C6) and aromatic hydrocarbons (BTX) were presented. In result of conducted investigations was qualified courses of changeability of concentrations in gases these substances before and for the cleaning system. The …

Jump Condition At The Boundary Between A Porous Catalyst And A Homogeneous Fluid, Francisco J. Valdes-Parada, J. Alberto Ochoa-Tapia

Francisco J. Valdes-Parada

The method of volume averaging (Whitaker, 1999) is used to derive the jump conditions between a porous catalyst and a homogeneous fluid. To simplify the analysis a first order kinetics is used and the convective transport is neglected. The statement for the derivation is in terms of the spatially smoothed equations obtained by Wood et al. (2000). We have followed a similar procedure to the one used by those authors to derive, besides a jump boundary condition that couples the two media transport, a closure problem to predict the effective reaction rate coefficient at the interregion dividing surface as a …

Avoid Sulfuric Acid Corrosion In Metallic Stacks, João F. Gomes

João F Gomes

Acidic gaseous effluents frequently cause corrosion on metallic stacks. This paper presents a method for prevision of probability of corrosion occurrence caused by gaseous effluents containing sulphur oxides which is based on the sulphur trioxide and moisture content measured in stack

Emissions Of Dioxin And Dibenzofuran From Electric Arc Furnaces, João F. Gomes

João F Gomes

This paper describes work done in order to clarify the formation mechanism of highly toxic micropollutants, such as dioxins and dibenzofurans, from electric arc furnaces used in the production of carbon steel from scrap. The study is allowing to derive relationships between the levels of airborne micropollutants and the operational parameters of the production process so that an abatement of pollution could be achieved. By using the European standard method CEN 1948 for dioxin like compounds sampling and measurement, it was possible to determine the characteristic fingerprint of micropollutants emitted by this particular stationary source.

Altered Hydrology In Connecticut Watersheds Prioritized For Protection, Denise Burchsted

Denise Burchsted

The Nature Conservancy (TNC) has selected the Saugatuck, Salmon, Eight Mile, Mount Hope / Natchaug, and Hollenbeck River watersheds for priority protection in Connecticut. A number of threats, including altered hydrology, have been identified in these watersheds. This project has been designed to better understand that threat and provide some context for future protection or restoration of the hydrology within those watersheds. The definition of altered hydrology is problematic, as the time at which the watersheds are considered unaltered is ambiguous and historic data is often unavailable. In order to address that difficulty, this project used the following approach: 1. …

Darcy's Law For Immiscible Two-Phase Flow: A Theoretical Development, Francisco J. Valdes-Parada, Gilberto Espinoza-Paredes

Francisco J. Valdes-Parada

The aim of this paper is to show how the method of volume averaging can be used to obtain a closed set of averaged equations for bubbling flow. The Navier–Stokes equations are considered as the starting point for the volume-averaging method. The closure was formulated as an associated problem with the deviations around averaged values of the local variables. When the traditional length-scale restrictions are imposed, the volume-averaged momentum equation can be given by &#;vk k – &#;vm m = Kk⋅ (–∇ &#;pk k + ρkgk), which is equivalent to Darcy’s law. The tensor Kk is determined by closure problems …

Markov Chain Monte Carlo Multiple Imputation For Incomplete Its Data Using Bayesian Networks, Daiheng Ni, John D. Leonard

Daiheng Ni

The rich ITS data is a precious resource for transportatio n researchers and practitioners. However, the usability of such resource is greatly limited by the issue of data missing. A lot of imputation methods have been proposed in the past decade. However, some issues ar e still not or not sufficiently addresse d. For example, the missing of entire records, temporal correlation in observations, natural char acteristics in raw data, and unbiased estimates for missing values. With these in mind, this paper proposes an advanced imputation method which is based on the recent development in other disciplines, especially applied statistics …

Runoff Production In The Upper Rio Chagres Watershed, Panama, Fred Ogden

Fred L. Ogden

Runoff production in tropical watersheds is governed by a wide variety of potential sources and there have been few rigorous studies to date. The 414 km2 upper Río Chagres basin offers a unique opportunity to better understand the runoff production mechanisms in tropical watersheds through data analysis and modeling with rainfall and runoff data. Flow data and tipping bucket rain gage data are available at both the basin outlet (Chico gage) and for an 80.6 km2 internal basin location (Piedras gage). Modeling is performed using the Sacramento Soil Moisture Accounting Model (SAC-SMA), calibrated using data from 2000 and verified using …

Analysis Of Welding Fumes: A Short Notice On The Comaprison Between Two Sampling Techniques, João F. Gomes

João F Gomes

No abstract provided.

Multistakeholder Evaluation Of Condominial Sewer Services, Earthea Nance

Earthea Nance, PhD (Stanford University, 2004)

No abstract provided.