ABSTRACT: BackgroundThe reverse pulse jet baghouse has been around for over 45 years and the cleaning cycle has not changed very much since that time. The cleaning cycle is the most important part of the dust collector because it controls efficiency and media life. In a generic baghouse, the cleaning system is comprised of a blowpipe that is located typically approximately three inches above the bag, with an orifice and a venturi, which is located at the top of the bag/cage. This system uses bursts of compressed...
The Light Duty Inter-Laboratory Correlation Exercise has conducted testing at 9 test laboratories in the EU, Korea and Japan in order to demonstrate the practicality, robustness, repeatability and reproducibility of the particle emissions measurement techniques proposed by the Particle Measurement Programme (PMP). The exercise involved testing 16 light duty vehicles including 6 diesels equipped with wall-flow Diesel Particulate Filters (DPFs), 6 conventional diesel vehicles, 3 direct injection petrol engined...
From California to New Jersey, environmentalists and politicians are rounding on emissions trading programmes. David Biello reports
Even as the Bush administration continues to build support for market mechanisms to solve air pollution issues – under his Clear Skies initiative – emissions trading schemes from California to New Jersey are under attack from environmentalists, citizen advocacy groups and state governments.
In New York State, Governor George Pataki is continuing a legal battle over the trading of...
Executive Summary
This case study describes a field analytical method that was used to measure PCB surficial contamination in empty drums to be cleaned by a new process. Approximately 7,000 empty 55-gallon drums that previously contained PCB-contaminated material had accumulated at the Department of Energy (DOE)’s East Tennessee Technology Park in Oak Ridge, TN. Because disposal of these drums following regulator-approved methods would have been very costly, DOE requested permission from the Environmental...
Sound level meters
Description and ApplicationsThe sound level meter is a lightweight instrument for the measurement of sound pressure level (SPL) in decibels. All ANSI-approved meters meet minimum requirements that include an A-weighted network, a slow-response meter characteristic, and a fully graduated scale with measurements ranging from 80 to 130 dBA. The Type II meter is most frequently used. Applications are in worker exposure and noise evaluations.
Octave Band AnalyzerSome sound level meters may have...
Air Pollution Creates Acid Rain
Scientists have discovered that air pollution from the burning of fossil fuels is the major cause of acid rain. Acidic deposition, or acid rain as it is commonly known, occurs when emissions of sulfur dioxide (SO2) and oxides of nitrogen (NOx) react in the atmosphere with water, oxygen, and oxidants to form various acidic compounds. This mixture forms a mild solution of sulfuric acid and nitric acid. Sunlight increases the rate of most of these reactions.
These compounds then...
Introduction
The leak repair requirements, under Title VI Section 608 of the Clean Air Act Amendments of 1990, require that when an owner or operator of an appliance that normally contains a refrigerant charge of more than 50 pounds discovers that refrigerant is leaking at a rate that would exceed the applicable trigger rate during a 12-month period, the owner or operator must take corrective action. The Clean Air Act also requires that refrigerant vented into the atmosphere during installation, service or...
Light
Description and Applications
The light meter is a portable unit designed to measure visible, UV, and near-UV light in the workplace. (The CTC has a UV light meter available through its loan program, ALEP.)
The light meter is capable of reading any optical unit of energy or power level if the appropriate detector has been calibrated with the meter. The spectral range of the instrument is limited only by the choice of detector.
Steady-state measurements can be made from a steady-state source using the...
When properly applied, ion exchange for concentrated ion recovery is by far the best available technology. Where effluent streams can be filtered and ions requiring different regenerants can be segregated, ion exchange is usually the most cost effective and least capital intensive solution. We provide 4 levels of integration to cover most applications and capital budgets. The variations in the system configuration trade your labor and attention for our automation. As you invest capital, the cost of operation,...
Background
GT Motors (GTM) is a small panel beating and spray painting workshop established in 1964, with a current of workforce of four. GTM currently repairs and refinishes approximately 30 cars a month from a largely private and growing customer base.
Like many environmentally responsible operators, the firm reuses and recycles as much of the wastes generated in their workshop as possible, and is generally receptive to ideas on how to improve its environmental and business performances.
The Projects
GTM...
The innovative, market-based SO2 allowance trading component of the Acid Rain Program allows utilities to adopt the most cost-effective strategy to reduce SO2 emissions at units in their systems. The Acid Rain Program operating permit outlines the specific program requirements and compliance options chosen by each source. Affected utilities are also required to install systems that continuously monitor emissions of SO2, NOx, and other related pollutants in order to track progress, ensure compliance, and provide...
These studies are the second part of a two year project that examines decontaminating groundwater
sampling devices. In the first year, the efficiency of various decontamination protocols was tested using
small test pieces of materials that are commonly used in groundwater sampling devices. Those tests showed
that a hot detergent wash and rinse followed by hot air drying (105°C) was the most effective decontamination
protocol. In these studies, two groundwater sampling devices, a bailer and a bladder pump,...
Introduction
Flow rate testing was performed on MS19 and MS12 elements (217 and 219 elements, 26 mil-spacer) to establish a temperature correction curve for current HR(PA) membranes. The results obtained were evaluated against the existing Osmonics® correction curve and other manufacturers’ information. Salt passage characteristics and the effect of elevated temperature on membrane performance were also noted during the study.
Conclusions
1.- Good correlation with the theoretical temperature correction curve...
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