1994-HIGH SCHOOL BUILDING COMMITTEE

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ASI FACTS SHEET 94-1 Cromaglass Wastewater Treatment System The Cromaglass wastewater treatment system is a "miniature" municipal treatment system scaled to fit inside a small fiberglass tank. Like in most modern municipal wastewater facilities, the Cromaglass wastewater stream is sequentially passed through a series of controlled batch processes to breakdown the solids, remove impurities and ready the "near drinking water quality" effluent for discharge. When most people hear the words wastewater treatment system, they think, "Shucks, that's out of my price range!" However, for the past 25 years, Cromaglass batch process systems have demonstrated that highly reliable quality treatment is readily available at affordable prices in the 500 to 50,000 gals/day design flow region. Typical performance and costs of wastewater facilities using Cromaglass modules are shown below. Now,you be the judge. ------------Performance-------------- ---------------Cost Estimates-------- Wastewater Treated Per Cent Design Flow-gaWday Influent Effluent Reduction 500 5,000 50000 BOD 180 mgll 8 mg/1 95.5% Treatment Module(s) $6K $35K $250K TSS 170 mgll 12 mgll 93% Total Installed System $IOK $75K $600K Nt 25 mgll 17 mgll(<5 mg) 30%(>80%) Annual O/M $500 $4K $17K ( )with denitrification option In the Cromaglass module, the batch treatment process occurs as the wastewater stream moves along through three separate chambers. In the first chamber, the organic solids are broken down and pass through grit screens. In the second, the wastewater undergoes 12 to 18 hours of biological cleansing as the armada of microorganisms feed on the "left-over" food supply. Anoxic denitrification (optional) also occurs here. In the third chamber, the suspended particles (organic ash and active microorganisms) slowly settle to the bottom----much like mud in a jar. After an hour of settling, the "clear odorless effluent" (in upper region of chamber) is then discharged and the activated sludge (at the bottom) is recycled or pumped to a sludge digestion tank. A simplified flow diagram of the Cromaglass treatment process is shown below. Cromaglass Sequencing Batch Reactor Module 1st Chamber 2nd Chamber 3rd Chamber primary treatment secondary treatment clarification •wash turbulan • 12 to 18 hours ' 1 hour of •continuous breaks down of quiescent wastewater so1e controlled settling •controlled flow in •grid screening aerationibiologii al *clear liquid discharge traps grit action discharged, every 3 to 4 sludge recycled hours (r cled sl dge) ion '—4 to 6 hours of anoxic denitrification For additional information,contact Bob Hynes at 1-508-833-8856 R-1 J