| 摘要 |
A process of detoxifying gas plant filters for environmentally acceptable disposal involves immersing the filters in aqueous cleansing fluid in a tank, containing a suitable cleaning agent. When saturated they are then agitated and passed through compressing rollers to extract as much cleansing fluid as possible. The extracted cleansing fluid returns to the tank it came from. The filters are then subject to similar repetitive steps of immersion, saturation, agitation, compression and fluid extraction in subsequent tanks. Five such stages are provided usually with diminishing proportion of cleaning agent in the aqueous cleansing fluid. The last two stages are often rinsing with water, although this is not always the case. The cleaned filters meet environmental standards for landfill disposal. The toxin accumulate as sludge in the tanks and are periodically removed for disposal in approved hazardous waste disposal sites.
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