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HomeMy WebLinkAboutTED4001782.62DECHLORINATION TREATMENT PROCESS: Dechlonnation is accomplished by the instantaneous chemical reaction of the free and combined chlorine in the pipeline with a dechlonnation agent. The type and grade of dechlorination chemicals available are: Sodium Thiosuffate (non -anhydrous) Technical grade-1001b. bags Sodium sutflte Technical grade and 1001b. bags Sodium B4uffite (anhydrous) Technical grade-1001b. bags and 4001b. drums APPLICATION: AMOUNT OF CHEMICALS REQUIRED: The residual chlorine in the pipeline will be neutralized by treating with one of the chemicals listed in Table 1. The amount of the chemical required will be determined from Table 1 based on the volume of water and the residuai chlonne concentration in the pipeline. TABLE 1 Pounds of Dechlonnation Chemicals Required to Neutralize Vanous Residual Chlonne Concentrations for Every 1,000 Gallons of Water Chemical and Am mt Required (Pounds) Residual Chlonne Sodium Sodium Concentration Thiosutfate Sodium Bisulfate (mgA or ppm) (non -anhydrous) Sulfite (anhydrous) 10 0.2 0.15 0.11 20 0.4 0.30 0.22 30 0.6 0.45 0.33 40 0.8 0.60 044 50 1.0 0.75 0.55 Stock Solution: A 1% by weight stock solution of the dechlonnation chemical will be prepared by dissolving every 1lb. of dechlonnation chemical used In 100lbs. of water. When prepanng this solution. the chemical should be added to the water and mixed until the chemical has completely dissolved. 1. Batch Method For small pipelines, dechlonnation can be achieved by collecting the chlonnated water In a containment vessel and adding with continuous mixing the required amount of a dechlonnation chemical stock solution (11b. of dechlonnating chemical for every 100lbs. of water). 11. Continuous Feed Method For large pipelines, where containment of the chlonnated water is impractical, the continuous feed method is recommended. The flow rate for the chlonnated water will be set at a constant rate in which a constant rate of dechlonnation chemical stock solution shall be fed into the flow The two rates will be proportioned so that the dechlonnation chemical concentration will be continuous throughout the penod required to flush the chlonnated water from the pipeline. Source of Supply of Chlonnated Water (blowoff, hydrant, etc.) DRAWN LOCAL SUPPLIERS Van Waters and Rodgers 8201 S. 212th Kent. WA Tel # 623-6151 or 872-5000 Jones Chemicals, Inc. 1919 Manne View Dnve Tacoma. WA Tel # 572-9030 Chemwest Corporation 2923 N.E. Blakeley Seattle. WA Tel # 525-8120 or 800-562-6794 PROCESS FLOW DIAGRAM: Dechlonnation Chemicals 1% Concentration (by weight) j Containment Vessel (tank truck) CHECKED PROJ. ENGR. DIST. ADM 3.16.87 © ADDED CONC. BARRIERS 81 SR405 COLUMN Lno:0 -4t0 • I7dt jDATE1 REVISION H-E DOT FORM 221-011 Revised 6 /80 Discharge to Sun-ounding Area ! I REN 100N STATE FED. AID PRDJ. NTOTAL C% SNOT SHEETS 6RM- t228 (2) 10 WASH I- 40S 3 (635) 83W106 D.M.m u,.::,... , No. BYIAPPD 66 L.F. TYPE 11 C01 SR 405 COLUMN EX� EMEND ppV OD It to 00 + o N Z Cr cn a " /--CASE 2, DESIGN F TERMINAL (MODIFIED) SECTION I I L (— 2'-0" 1 TYPE II CONCRETE BARRIER REPLACE EXISTING PAVEMENT REMOVED DURING EXCAVATION FOR FOOTING WITH ACP, CLASS B (2" CLASS B , 5"ATB, FULL DEPTH SECTION) _J R LINE " —COLUMN (TYR) I 20' RADIUS -- FOOTING (TYP. ) BEAM GUARD RAIL,TYPE I y` - 50'-0" CASE 2, DESIGN F TERMINAL (MODIFIED) SECTION ,I\ SURVEY LINE C51 8GUARD RAIL PLACEMENT 8 NOTE: FOR BEAM GUARD RAIL TERMINAL DETAILS SEE STANDARD PLAN C -10 4 BEND 25 1/20 TOP VIEW 3011 (NOM.) � 3� I 3/4"0 HOLE SIDE VIEW DESIGN F TERMINAL (MODIFIED) SECTION DIVISION OF HIGHWAYS (-Ian e 2 7, 1?83 0 Amah, Washington State wro Department of Transportation REGION NO. STATE FEDERAL AID PROJECT NO. SHEET N0. 10 WASH. BRM- 1288 (2) I'-405-3(635i BUFFER END SECTION Y gficy }', S.W. GRADY WAY BRIDGE REPLACEMENT MISCELLANEOUS DETAILS AM/ 7 g2W#*r SC*1..- , - — 1I.Mit 0, o wJj C -,/ k1 000% 11171,2