DMCP

Dust Mapping & Control Plan

Dust: It consists of particles in the atmosphere that come from various sources such as solid particles from raw materials, soil dust lifted by weather / Wind flow, Flue Gases, vehicle movement etc. It is generally regarded as particulate matter up to 75 µm (micron) diameter and can be considered in two categories. Fine dust, essentially particles up to 10 µm, is commonly referred to as PM10. Coarser dust (essentially particles greater than 10 µm) is generally regarded as ‘nuisance dust’ and can be associated with annoyance.

PM10 is measured to agreed standards and forms part of National Air Quality Strategy (NAQS) objectives (AQO) and comprises what is defined as health risk dust. There are no official standards (such as AQO) for dust annoyance or 'nuisance dust'.

The expression ‘nuisance dust’ relates to the human perception of, or reaction to, some aspect of dust pollution, such as the long-term, chronic, soiling of surfaces or the visibility of acute, short-lived, dust clouds. In the absence of standards, ‘custom and practice’ criteria for assessing nuisance dust have been developed.

DUST LEVEL STANDARD

AUTHORITY MEASURED AS: 24 HR MEAN RELEVANCE
UK AIR QUALITY STANDARD 50 ΜG/M3 AIR QUALITY IN RELATION TO PUBLIC HEALTH
INDUSTRIAL 190.6 - 238.2 ΜG/M3

DUST SOURCES AND GENERATION

Although it is a widespread environmental phenomenon, dust is also generated through many human activities. This includes activities such as materials handling operations, vehicle and machinery movements at the sites of quarries and mines, heavy industry, waste and recycling, construction and demolition, power generation, agriculture (especially arable farming) docks, harbors and roads and railways.

Dust is generally produced by mechanical action on materials and is carried by moving air when there is sufficient energy in the airstream. More energy is required for dust to become airborne than for it to remain suspended. Dust is removed through gravitational settling (sedimentation), washout (for example during rainfall or by wetting) and by impaction on surfaces (e.g. on vegetative screening). Dust can be re-suspended where conditions allow, such as from bare ground.

DUST PROPAGATION

Dust propagation through air is influenced by many factors including particle size, wind energy and disturbance activities. Large dust particles generally travel shorter distances than small particles. It is often considered that particles greater than 30 µm will largely deposit within 100 meters of sources, those between 10 – 30 µm to travel up to 250 – 500 meters and particles less than 10 µm to travel as far as 1 km or more from sources. These distances may be exceeded.

DUST RECEPTORS

When propagated, dust travels on a pathway towards its final resting place which may arise from settlement, washout or impaction. This final location is the receptor; clearly certain locations are more important and sensitive than others. Table 7 of the National Planning Policy Framework (NPPF) Technical Guidance, identifies broad categories of high, medium and low dust sensitive facilities. The most sensitive receptors are hospitals and clinics, high-tech industries, painting and furnishing and food processing facilities.

DUST MAPPING

At a basic level dust data can be plotted as dust roses.

Arrelic DMCP packages are tailored to meet specific client requirements. Dust data can be integrated with spatial information such as site plans, where AAC%, EAC% and “Impact Risk” dust rose diagrams can be overlaid onto site plans or drawings. These diagrams are extremely useful when multiple gauges are installed in and around a site. Dust source directions and pathways can be identified and compared with baseline conditions and with conditions in different parts of the site, and resulting from different processes and process locations over time.

Data can also be plotted with respect to different dust properties such as element distribution and source apportionment based on appropriate chemical testing.

When meteorological data is available it becomes possible to review dust levels for different weather conditions over various periods. This information can then be used to assess the extent of changes in dust levels that may arise as a result of new or proposed industrial activities – hence its value in Environmental Assessments and on-going site management in critical areas.

Arrelic is committed towards promoting the use of monitoring equipment in dust and air pollution studies to validate theoretical modelling studies. Monitoring allows for actual levels of dust, or concentrations or proportions of specific pollutants, to be measured so that modelling predictions can be evaluated.

KEY BENEFITS OF DUST MAPPING & CONTROL PLAN

  • Direct financial benefits such as yield improvement of raw materials.
  • Availability, Reliability and Productivity improvement of plant assets.
  • Less forced deterioration impact on machine life.
  • Process stabilization for less dust generation.
  • Brand impact in socio economy life.
  • Employees health impact.

ARRELIC EXPERTISE IN DUST MAPPING & CONTROL PLAN

  • Expertise in dust control in Ferro-alloys, cement, steel and power plants.
  • Building a DMCP program that is most financial viable and long term sustainable.
  • Single point contact for building strategy to implementation for dust control.
  • Mapping the dust level across the plant with best in class sensors.
  • Over 20+ years of combined experienced in controlling dust.
  • Assured to reduce over 80% of dust level in 1 year.
  • Bringing the best practices from 16 industries and 5 continents

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