Review of Biotreatment, Water Recovery, and Brine Reduction Systems for the Pueblo Chemical Agent Destruction Pilot Plant (2013) / Chapter Skim
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3 The Water Recovery and Brine Reduction Systems
3 The Water Recovery and Brine Reduction Systems
Pages 23-32
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From page 23... ...
stream that was used for the design basis for the BRS is given in Table 3-1. To prevent calcium carbonate fouling of Consequently, the WRS at PCAPP can be considered the evaporator heat exchangers, the carbonate and bicarbonessentially as tankage and associated piping used to collect, ate in the evaporator feed, most of which originates from mix, and condition the various liquid effluents for delivery to the biological breakdown of organic matter in the ICBs, is the main operations involved in water recovery that occur in removed by a three-stage process: (1)
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From page 24... ...
NOTE: OTS, off-gas treatment system. SOURCE: Adapted from Veolia Water Solutions & Technologies, Bench Scale Evaporation of Waste Brine and Filter Testing, 2010.
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From page 25... ...
990 ppm This mixed liquid is then pumped from the bottom of the Temperature 102°F evaporator vessel to the top of the tubes where, ideally, it is Specific gravity 1.011 distributed uniformly to each tube. Evaporation is caused SOURCE: Adapted from George Lecakes, Chief Scientist, PCAPP, by heat transfer across the tube walls from the steam in the "PCAPP's Water Recovery and Brine Reduction System Briefing," presenta- shell to the liquid inside the tubes.
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From page 26... ...
Chevron baffles A simplified block diagram of the crystallizer system is are provided in the crystallizer vessel to remove liquid drops shown in Figure 3-4. The crystallizer feed tank is a vertical from the steam before it enters the condenser.
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From page 27... ...
The remaining vapor combines with the of the slurry to the belt filter, which is a fully automated vented vapor from the BC feed deaerator and passes to pressure filter. Concentrated slurry is removed from the the BRS vent condenser where some condenses and drains crystallizer slurry circulation loop at a point upstream of by gravity to the BRS distillate carbon filter feed tank.
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From page 28... ...
ACTIVATED CARBON ADSORPTION Uses of Carbon ISSUES RELATED TO THE WATER FLOW STREAM Granular activated carbon removes organic contaminants The distillate carbon filters are the last line of defense from the pH-adjusted distillate before it is recycled to the controlling the quality of water to meet drinking water stanplant for reuse in various processes, such as agent hydrolysis, dards. If contaminants are not removed to the desired extent, biological treatment, cooling towers, and the reverse osmosis or if the filters require excessive backwashing because of feed for preparing water for boiler feed.
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From page 29... ...
While the organisms from the biotreatment process uct water from the distillate activated carbon filters of should have been killed at the temperatures of 100-plus°C in the PCAPP BRS will meet permit requirements. There is the evaporator and crystallizer, the microbes present will be insufficient detail available on the composition of the total those that grow within the adsorber.
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From page 30... ...
If the effluent Water Standards fails to meet permit requirements, it may be necessary to Drinking Water operate the carbon system for shorter periods of time before Immobilized Cell Standard maximum carbon replacement. If the rate of pressure drop increase is Bioreactor Effluent, contaminant level too large, the level of suspended solids in the influent may Contaminant μg/L (MCL)
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From page 31... ...
PCAPP should conduct careful monitoring of the feed stream to the BRS and the combined distillate for compounds of concern during start up and initial ISSUES RELATED TO THE SOLIDS FLOW STREAM operation of the plant. As yet unidentified compounds may A primary issue relates to dewaterability of the solids by be present in the feed to the BRS that will have a disproporthe belt filter.
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From page 32... ...
2010. Colorado Primary Drinking Water Regulations 5 H2SO4 addition prior to the deaerator.
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