Analysis of RA-21 effluent data: GFERC slagging fixed bed gasifier
In view of the results of the present study, the need for preservation of GFERC aqueous condensates should be systematically evaluated for most measured species. Degradation of cyanide and sulfur species is significant in GFERC wastewater and indicates a clear need for sample preservation in the fut...
| Main Authors: | , |
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| Language: | unknown |
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2020
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| Subjects: | |
| Online Access: | http://www.osti.gov/servlets/purl/6172474 https://www.osti.gov/biblio/6172474 https://doi.org/10.2172/6172474 |
| Summary: | In view of the results of the present study, the need for preservation of GFERC aqueous condensates should be systematically evaluated for most measured species. Degradation of cyanide and sulfur species is significant in GFERC wastewater and indicates a clear need for sample preservation in the future. Results of studies for COD, TOC and phenolic compounds are inconclusive, but require assessment due to apparent negative biases introduced by preservation. Significant quantities of most aqueous effluent species are produced by the slagging fixed bed gasifier, most notably cyanide, thiocyanate, sulfur, ammonia and phenolic compounds. Accurate characterization requires the incorporation of fully validated preservation and analytical procedures. Current GFERC procedures for thiocyanate and sulfur species need development work due to interferences caused by the presence of oils and tars in the spray washer system. Careful evaluation should be made of the characterization of effluent production utilizing the existing spray washer system. End-of-run composite sampling is inadequate for characterization of effluent species known to degrade in aqueous solution. Spray washer effluent removal efficiencies are fair for cyanide and poor at best for sulfur species. Characterization of gas streams entering and leaving the spray washer must be performed on a regular basis to fully establish the fate of effluent constituents having partial solubilities in water (e.g., HCN, H/sub 2/S). Care should also be taken in the production of wastewater for treatability studies to account for effects of degradation and dilution in the establishment of initial wastewater conditions. |
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