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Chapter 4 Evaluation of Combined Heat and Power Technologies for Wastewater Treatment Facilities Media removal and replacement is maintenance intensive. Also, iron sponge media has been known to smolder when exposed to oxygen or even spontaneously combust. Therefore, the operation of an iron sponge system requires careful process control. Other H2S removal alternatives feature proprietary iron oxide sorbents. These systems include SULFATREAT®, Sulfur-Rite®, and SULFA-BIND®, all of which feature an inorganic substrate to which the proprietary sorbent adheres. Like iron sponge, these alternative media can typically be regenerated and once exhausted can be safely disposed of at most landfills. Also like iron sponge, these alternative media often perform best with water-saturated digester gas. Figure 4-1. Hydrogen Sulfide Removal Vessels at the Central Weber SID, Ogden, Utah 4.1.2 Moisture Digester gas is fully saturated with water as it is produced within anaerobic digesters. Fully water saturated means that liquid water will condense out of the digester gas with each and every reduction in gas temperature, regardless of how slight the temperature drops may be. Microturbines and fuel cells are sensitive to moisture-laden fuel. It is important that digester gas used to fuel these prime movers be virtually moisture free. Also, certain digester gas treatment processes and some types of digester gas treatment equipment function best when the digester gas is dry. Some moisture can be easily removed from digester gas by cooling the gas below its dew point and condensing the water out of the gas. Mechanical gas dryers or heat exchangers coupled with water chillers are commonly used for this purpose. Desiccant driers and coalescing filters can also be used for moisture removal. Desiccant dryers can produce exceptionally dry gas but must be regenerated, while coalescing filters can only remove liquid water droplets and cannot reduce water vapor content. 4-2PDF Image | Combined Heat and Power Technologies for Wastewater Facilities
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