air particle monitoring Articles
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Statistical Corrections Microbial Monitoring in Grade C/D Cleanrooms
Microbiologists rely on the Feller table to correct for undercounting of biological activity. The “Table of statistical corrections according to Feller” is based on the principle that as the number of viable particles — colony forming units (CFUs) — impact on an agar plate increases, the probability that viable particles will enter unoccupied space decreases. This table ...
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Maintaining Quality in Stem Cell Products: Stem Cell Process Monitoring (Series Part 4 of 4)
Routine cleanroom, clean air devices, and personnel monitoring should be performed during operation throughout all critical stages. Ideally, monitoring should capture all interventions, transient events and system deterioration. The type of contamination being monitoring is either total particle (non-viable) or viable. Requirements for All Types of Monitoring The locations, frequency, volume, ...
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Ultrafine particle monitoring for air quality measurements – Air quality affects us all
While the field of air quality encompasses many aspects, one topic that is been gaining attention in recent years is the measurement of ultrafine particles. What are ultrafines? Ultrafines are particles that are too small to contribute appreciably to mass-based measurements, but are present in ambient air. They are quantified using the concept of ‘number concentration’, or number of ...
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Microfiltration Pilot System, California
INTRODUCTION In May 2013, Pure Aqua, Inc. successfully manufactured and supplied an microfiltration pilot system to a membrane manufacturer for Title 22 certification. Title 22 is the State of California’s stringent standard for treatment/disinfection of wastewater for non-potable reuse and discharge. The certification is considered the global standard for water reuse. MF/UF is the best ...
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Evaluation of flow hydrodynamics in a pilot-scale dissolved air flotation tank: a comparison between CFD and experimental measurements
Computational fluid dynamics (CFD) models of dissolved air flotation (DAF) have shown formation of stratified flow (back and forth horizontal flow layers at the top of the separation zone) and its impact on improved DAF efficiency. However, there has been a lack of experimental validation of CFD predictions, especially in the presence of solid particles. In this work, for the first time, both ...
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Evaluation of flow hydrodynamics in a pilot-scale dissolved air flotation tank: a comparison between CFD and experimental measurements
Computational fluid dynamics (CFD) models of dissolved air flotation (DAF) have shown formation of stratified flow (back and forth horizontal flow layers at the top of the separation zone) and its impact on improved DAF efficiency. However, there has been a lack of experimental validation of CFD predictions, especially in the presence of solid particles. In this work, for the first time, both ...
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Modelling the impact of sea-salt particles on the exceedances of daily PM10 air quality standards in the Netherlands
Particles generated at the sea surface contribute to PM10 levels in coastal areas. Current estimates suggest annual average contributions of up to 10 µg/m³ along the North Sea coast in the Netherlands. In this paper the generation of size-segregated sea salt particles is described as a function of meteorological parameters. These particles are fed into a model where transport and deposition ...
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Virtual Demo: Antibacterial MiniCapt Mobile Microbial Active Air Sampler from Particle Measuring Systems
The MiniCapt Mobile microbial active air sampler from Particle Measuring Systems (PMS) is an innovative and lightweight portable microbial sampler. It simplifies the job of microbial air sampling by applying modern data management capabilities that save time and reduce operator error in air sampling data. With its new Antibacterial housing, the MiniCapt Mobile boasts a 95% reduction in bacterial ...
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The Steps of a Risk Assessment for an Aseptic Filling Line
Here, we will discuss the steps of a risk assessment for an aseptic filling line. Classification First, lock down the classification of your cleanroom. Classification: Is a method of assessing the level of cleanliness against a specification for a cleanroom or clean zone. Should be clearly differentiated from operational process monitoring. Should tell you the number and location of ...
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Pegasor AQ Indoor - White Paper
What needs to be measured from indoor air? Today there is no legislation for indoor air ultrafine particle (UFP) concentration. Particulate matter found indoors will include particles of outdoor origin that migrate indoors and particles that originate from indoor sources. Indoor Particulate Matter (PM) can be generated through cooking, combustion activities (including burning of candles, use of ...
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Monitoring air pollution and mitigation for workplace safety at a Cement Factory in India - Case Study
Our Client Devic Earth is a green technology company, whose state-of-the-art technological solutions help mitigate ambient air pollution. This is done using pulsed Wi-Fi that accelerates agglomeration and settling down of particles less than 20 microns in diameter. Devic Earth’s client is one of the largest producers of cement in India and is an industry leader in sustainability ...
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Cubic Laser Particle Counter for Semiconductor Cleanroom Air Cleanliness Monitoring
According to a recent World Fab Forecast issued by Semiconductor Equipment Manufacturers International (SEMI), more than 50% of semiconductor yield losses can be attributed to micro-contamination. For minimizing yield losses, it is essential for semiconductor fabrication plants (semiconductor fabs) to adopt rigorous contamination control strategies in the cleanrooms. Particulate matter is one of ...
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Selecting an Airborne Particle Counter: Types of Monitoring (Series Part 2 of 4)
Frequent or Continuous? Frequent Monitoring To demonstrate compliance to ISO, frequent monitoring requires sampling at specified time intervals not exceeding 60 minutes during operation. Manifold systems are the least expensive solution and usually installed during the cleanroom construction process. Standalone particle counters may be installed at any time. A manifold system includes either 16 ...
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Project - AFC Ingenieros SA - Environmental monitoring in Works and Demolitions: Vicente Calderon Stadium
CUSTOMER: AFC Ingenieros SA USER: AFC Ingenieros SA LOCATION: Old Vicente Calderón Stadium (Madrid, España) ENVIRONMENT: Works and demolitions YEAR: 2019 Project: As a result of the new rules from Madrid’s City Council, firms in charge of demolition works must carry out environmental monitoring in all their works to ensure the air quality in the zones where those ...
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Guide to Particle Measurement Techniques
Background Particle counting is a critical aspect of any machine conditioning program and there are many tools out there available to monitor and track the quantity and severity of the contamination, be it due to external contamination or machine wear. The specific application and type of particles will often govern what is the best particle counting technique for the job at hand. The continuous ...
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Dust monitoring with AirSafe - Case Study
Application A waste incineration plant burns waste. A fi nal product of this incineration process is fi lter dust, which is stored in silos before being evacuated. For the ambient air monitoring of the silos, convey lines and connected rooms, the plant manager looked for a maintenance-free way to detect dust leaks and malfunctions. Optical techniques were not considered because of the degree ...
By ENVEA
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Benefits of Air Quality Monitoring
The air we breathe has an immeasurable impact on our lives. It’s not just a matter of sustenance, health, and well-being. As urbanisation and industrialisation continue to surge, the need for robust air quality monitoring becomes more pressing. Today, air quality monitoring isn’t merely a trend; it’s a necessity. Real-time air quality monitors have revolutionised the ...
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