Effects Of Wind Speed And Direction

Horizontal winds play a significant role in the transport and dilution of pollutants. As wind speed increases, the volume of air moving by a source in a period of time also increases. If the emission rate is relatively constant, a doubling of the wind speed halves the pollutant concentration, as the concentration is an inverse function of the wind speed. Pollutant dispersion is also affected by the variability in wind direction (Godish 1991). If the wind direction is relatively constant, the...

Wind Speed

The wind speed is the mean wind speed over the vertical distribution of a plume. However, usually the only wind FIG. 5.8.6 Horizontal dispersion coefficient as a function of downwind distance from the source. (Reprinted from D.B. Turner, 1970, Workbook of atmospheric dispersion estimates (Revised), Office of Air Programs Pub. No. AP-26, Research Triangle Park, N.C. U.S. EPA.) FIG. 5.8.6 Horizontal dispersion coefficient as a function of downwind distance from the source. (Reprinted from D.B....

Effluent Recycling Pump

FIG. 7.35.9 Schematic diagram of two fluidized-bed reactors in series for biological wastewater treatment. (Reprinted, with permission, from E.T. Oppelt and J.M. Smith, 1981, U.S. Environmental Protection Agency research and current thinking on fluidised-bed biological treatment, in Biological fluidised bed treatment of water and waste water, edited by P.F. Cooper and B. Atkinson, Chichester Ellis Horwood Ltd., Publishers.) to 4.8 kg m3 day for a standard oxygen-activated sludge process. The...

Specific Provisions

The EPCRA provides for emergency planning and notification and specifies reporting requirements and its relationship to other laws. The EPCRA ( 301, 42 USC 11001) requires states to establish a state-level emergency response commission and local emergency planning districts to prepare and implement emergency plans. Each planning district designates a local emergency planning committee comprised of impact groups in the community (EPCRA 301 c , 42 USC 11001 c ).14 Each local committee establishes...

Table 7551 Design Considerations For Aerobic Sludge Composting Processes

Both untreated and digested sludge can be composted successfully. Untreated sludge has a greater potential for odors, particularly for windrow systems. Untreated sludge has more energy available, degrades more readily, and has a higher oxygen demand. Amendment and bulking agent characteristics, such as moisture content, particle size, and available carbon, affect the process and quality of the product. Bulking agents should be readily available. Wood chips, sawdust, recycled compost, and straw...

Table 333 Operationsbased Pollution Prevention Strategies

Implement a computerized raw material inventory tracking system. Maintain product inventory to minimize changeovers for batch operations. Purchase raw materials in totes and other reusable containers. Purchase raw materials with lower impurity levels. Practice first-in first-out inventory control. Housekeeping Practices Recycle and reuse wooden pallets used to store drums. Implement procedures to segregate solid waste from aqueous discharges. Implement procedures to segregate hazardous waste...

Recycling Waste Streams Directly

If waste streams can be recycled directly, this way is clearly the simplest to reduce waste and should be considered first. Most often, the waste streams that can be recycled directly are aqueous streams which, although contaminated, can be substituted for part of the freshwater feed to the process. Figure 3.8.2 is a flowsheet for the production of iso-propyl alcohol by the direct hydration of propylene. Propylene containing propane as an impurity is reacted with water to give a mixture which...