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II:'.E. Environmental Into. 50f9 I, 'i r http://WWW.lCeco.comJenVITOnL.hlm exhaust stream. When the droplets fall to the bottom of the scrubber, they are drained out Often the scrubber drain water is taken to a settling or re-circulation tank, where the heaviest particulate matter settles out as sediment. The sediment is disposed of in accordance with local regulations. Sometimes the water is reused (because of expense) after being PH-treated to reduce corrosiveness. In other instances, the scrubber water is not reused and is simply drained to the sewer. Wet scrubbers are not commonly found on cremation equipment because their pollution-reducing benefits do not offset their prohibitive cost ($30,000 to $60,000). Bag Houses A bag house is another type of add-on pollution control device. It is usually a large metal box. with an entrance and an exit. through which the exhaust gases are directed. Inside the box are filter bags of different sizes. Often these bags have shaker arms attached; when the bags become dirty, the shaker arms can be rattled and the heavy particulate matter that collects on the bags will fall out into a collection hopper at the bottom of the box. Although bag houses appear to be effective in reducing particulate output, the exhaust must be substantially cooled (to before 5000F) prior to its entrance into the bag house. Otherwise, the filter bags become so hot they ignite, which renders then ineffective and adds to pollutant output. Bag houses have been required in the United States on only a few occasions; their success has been minimal, at best. Ambient Dust Collectors Ambient dust collectors are devices used to minimize operator exposure to dust. Like small bag houses, they have an entrance and exit to the collector and internal filters. Both stationary and portable models are convenient for use in a typical workplace. Since they are not part of the cremation equipment, they are not exposed to high temperature and can be effective in protecting the operator. Air Pollution Pennits It is very important for crematory operators to understand the air pollution permit that allows them to operate their cremation equipment. Non-compliance with the permit conditions can result in fines or other enforcement action. Air pollution permits consist of conditions that specify how the cremator is to be operated and required compliance methods to prove the conditions are being met. Pennit Conditions The following are examples of common permit conditions: - Minimum Temperature and Retention Time Requirements Many states have an established minimum temperature requirement for the afterchamber. This may require pre-heating the afterchamber to the minimum temperature before beginning the cremation. A minimum retention time for the afterchamber is usually specified also. - Emission Limits The most common specified limits are for visible emissions, particulate matter and carbon monoxide. The limits for visible emissions may be specified in average opacity readings over a period of time or for a maximum opacity at any time. The particulate matter and carbon monoxide limits are usually in concentrations of the amount of pollutant per cubic foot 8/1/018:04 AM