Pollution Engineering - September 2008 - (Page 45)

coating and dying, fiberglass manufacturing, formaldehyde resins production, furniture manufacturing, paint manufurnitu facturing, pharmaceuticals production, facturi the pr printing industry, resins production, p and tir manufacturing, among others. tire r Such efficiencies have been achieved h thanks to a specific grade of granular s activated carbon, an approach velocity activat t through the carbon of less than 75 feet throug g per minute, an 18-inch depth of carbon m bed, and a relative humidity in the air a stream of less than 50 percent. Modern filtration Since these regulations went into effect, technology has caught up to the high expectations of the federal government. Advances in filtration have allowed almost the entirety of HAP and VOC emissions to be removed from industrial sources. But taking a look at one such modern filtration device can demonstrate how Microbes and carbon work together in this rotating filtrations system to remove the hard it actually was to get there. HAPs and VOCs from exhausts, and clean up the water at the same time. One modern filter for such applications is comprised of a stainless steel outer housing with a rotating drum mounted inside the housing. The rotating drum contains an 18-inch layer of granular activated carbon sandwiched between layers of perforated steel, and steel screens through which the exhaust air must pass in order to exit the filter. HAPs and VOCs are adsorbed onto the carbon. The rotating drum cycles through a water bath in the bottom of the outer housing with approximately 30 percent of the carbon in the drum being submerged at all times, and the pollutants are leached from the carbon into the water by use of a microbial product placed in the water. The drum rotates at three revolutions per hour. The water is aerated by the blower unit and contains a proprietary assemblage of microbes. The microbes degrade the pollutants into carbon, CO2 and water, and the filter has a clean bed of carbon as it emerges from the water bath. The microbes must be added every four weeks to maintain a viable colony for consistent degradation. The microbes will reduce the contaminants in the water to near EPA drinking water standards for the contaminant. This is accomplished without a sludge buildup of any kind. The filter is equipped with its own aeration system and rotating drive assembly. The total electrical requirement is 1½ horsepower for the standard systems. The filter housing and screen arrangement is constructed of 304 stainless steel. The aeration piping is schedule 40 PVC or 304 stainless steel. The blower is capable of delivering 70 CFM at 40 inches of water column. SEPTEMBER2008 www.pollutionengineering.com 45 http://www.transenvsys.com http://www.transenvsys.com http://www.pollutionengineering.com

Table of Contents Feed for the Digital Edition of Pollution Engineering - September 2008

Pollution Engineering - September 2008 Contents The Editor’s Desk Reader Comments EnviroNews PE Events Legal Lookout Environmental Management The Green Files Guest Dialog 500-Year Storm Control How Do You Clean Up 100 Years of Pollution? SPCC: Don’t Wait and See The Next Wave in Air Purification An Invitation to the Windy City Flood Control Infrastructure Saves ‘Green’ Puts a New Spin on Pest Control Instrumentation Products Material Safety and Storage Equipment PE Products Classified Marketplace Advertisers Index State Rules

Pollution Engineering - September 2008

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