Document v6MeqDDY07ODaD5vzMZzp70w6

K. ^- - Vr CD CD ..n; V ' t_. C'-C /| iv>- .--js LABORATORIES. INC. December 29, 1970 . Monsanto Company P. O. Box 249 Anniston, Alabama 36201 . Attention: Mr. W. F. Taffee ' j Engineering Supervisor / ' . , Re: Clarification of Neutralization Pit Effluent Gentlemen: - Enclosed are the results of the laboratory clarification and analytical testing of your neutralization pit effluent. The tests were conducted in accordance with your letter of November 2, 1970, from Mr. W. F. Taffee and conversations with our Mr. M. L. Mitchell and local representative, Mr. A. S. Freeman. ,* . Our laboratory test results leads us to recommend a treatment consisting of a bentonite clay and a strongly cationic polyamide poly electrolyte at a chemical cost of approximately two cents per thousand gallons. The laboratory jar tests showed that the addition of these chemicals followed by a four to ten minute rapid mix at 100 rpm and one minute of settling immediately after rapid mixing . produced the following quality of supernatant. Initial Suspended Solids Initial Turbidity . Initial Organic Carbon / ppm PPPI . 532 ` 204 52 1076 400 70 DSW 345521 STLCOPCB4084149 CAeORATORtES. INC. \ Supernatant Suspended Solids Supernatant Turbidity Supernatant Organic Carbon ppm. . 16-26 2-7 1-2 BE*5L 6-26 1.5-6 2-3 The suspended solids and turbidity in the jar test supernatant are a result of some floating solids which are normally present due to insufficient turbulence at the waters' surface during mixing. In actual practice this problem should not occur due to improved mixing and the mechanics of a solids contact clarification system. . Analytical Data Sheet (ADS No. 1) shows the analysis of a gallon plant effluent sample collected on October 27, 1970. Your November 2, 1970, letter indicates that the analysis of this sample should adequately describe the quality of the four one-gallon neutralization pit effluent samples submitted for the clarification tests. ADS No. 1 shows that the sample contained high concentrations of calcium and chloride, 220 and 224 ppm respectively. The 0.1 ppm phosphate and 0. 2 ppm iron are low. The 9 ppm of organic carbon in the sample was reduced to only 8 ppm by laboratory filtration. The sample of neutralization pit sludge contained sixty percent solids. Initial Screening Test In order to conserve the samples of neutralization pit effluent, the initial jar testing was conducted on a waste solution produced by mixing a portion of the sludge sample with demineralized water. This prepared waste sample had DSW 345522 -2- STLCOPCB4084150 t BIJTlTS LABORATORIES. INC. \ a pH of 6.7, turbidity of 220 ppm, and approximately 500 ppm suspended solids. The 500 ppm solids concentration was selected since it was midway between the 0.01 -0.1 percent solids concentration anticipated in the neutralization pit effluent. The initial jar test screening evaluations are summarized in ADS No. 2. Alum and ferric chloride at concentrations up to 50 and 25 ppm, respectively did not produce satisfactory flocculation and solids removal. The use of a high molecular weight anionic polyelectrolyte with the primary coagulant resulted in additional solids removal; however, the lowest turbidity level found in the highest quality supernatant was 58 ppm. The initial screening tests indicated that the maximum reduction of suspended solids and turbidity could be obtained with 15 ppm of SPV bentonite clay and 7.7 ppm of a liquid strongly cationic polyelectrolyte; Betz Poly-Floe 1170. The chemical treatment combination in test No. 20 was utilized in test No. 22 but with additional rapid mixing and no flocculation mixing at 30 rpm. The solids reduction to a turbidity of 11 ppm in test No. 22 appeared economical and was the basis for the tests summarized in ADS No. 3. *- The tests and results shown in ADS No. 3 employed two different types of bentonite clay and a strongly cationic liquid polyelectrolyte. The Coaguloid clay has a higher cost per pound and thus lower concentration was used in the test in order to permit comparison of the two clays on an equal cost basis. DSW 345523 -3 - STLCOPCB4084151  BHiTS i^ooRATORiea, inc. Comparison of the results from tests 1 through 6 indicate that at a neutral pH the treatment using the Coaguloid clay reduced the turbidity to levels similar to but slightly lower than with the SPV clay. The initial solids concentrations ranging from 200 to 800 ppm did not adversely affect the results when the same concentrations of treatment chemicals was employed. Comparison of the results from tests 7 through 12 show that at the lower pH of 5. 0 the Coaguloid clay and polyelectrolyte was less effective. The SPV clay and polyelectrolyte produced excellent results under the same test conditions. Final Testing and Recommended Treatment The results of final testing are shown in ADS No. 4. This exhibit summarizes the recommended clay and cationic polyelectrolyte treatment. These tests were conducted on neutralization pit effluent samples mixed with 500 and 1000 ppm of solids from the sample of neutralization pit sludge. All samples were mixed for four to ten minutes at 100 rpm in order to produce good flocculation and a rapid settling floe. Although the additional fast mixing improved the performance and rate of floe settling within the one minute settling period evaluated, a five minute rapid mix followed by a short flocculation mixing and settling in a solids contact clarifier should provide an effluent with a low organic carbon concentration and a suspended solids concentration lower than the values shown in the laboratory testing results. It is recommended that you equip your pilot plant clarification facility with an external rapid mix basin to further evaluate this parameter. -4- DSW 345524 STLCOPCB4084152 i LABORATORIES! INC. \- Under separate cover we are submitting waste, supernatant, and sludge samples collected during the tests shown in ADS No. 4. We thank you for the opportunity to provide these services and trust that the test results meet with your approval. If you should have any questions regarding the information presented, please do not hesitate to contact this office or our local representative, Mr. A. S. Freeman. Very truly yours. BETZ LABORATORIES, INC. WJS/abd Enclosures cc: +2 W. John Soost Project Engineer Consulting Division - 5- qSW 345525 STLCOPCB4084153 WATER ANALYSIS FOR \ Monsanto Company Anniston Alabama Analytical Data Sheet No. 1 3a TREVOSE, PENNSYLVANIA 19047 SAMPLING POINT Gallon Sample Plant Effluent Total Hardness as CaCO,. upm 310 Calcium as CaC03, ppm 220 Magnesium as CaC03, ppm 90 Phenolphthalein Alkalinity as CaCO^, ppn i 0 Methyl Orange Alkalinity as CaCO->. non i 44 Sulfate as S04, ppm 60 Chloride as Cl, ppm Silica as SiOz, ppm. Total Phosphate as POa. PPm Ortho Phosphate as P04, ppm pH Total Iron as Fe, ppm Biochemical Oxygen Demand, (BOD), ppm Chemical Oxygen Demand, (COD), ppm Total Carbon, ppm 224 13. 5 0. 1 0.1 6.6 0.20 16 42 3(1) 'TO 21 19 Inorganic Carbon, ppm 12 . 11 Organic Carbon, ppm Specific Conductance Micromhos, 18C 98 650 Total Solids, ppm 708 Total Fixed Solids, ppm 296 Suspended Solids, ppm Suspended Fixed Solids, ppm 10 1' Color Units _ 10 . . sample dated: October 27, 1970 '- ' (1) Shaker l Sample (2) Filter id Sample - .. -. CSV* STLCOPCB4084154 ANALYSIS FOR Monsanto Company Anniston Alabama - Analytical Data Sheet No. 2 'IP-- TREVOSE, PENNSYLVANIA 13047 Coagulation Jar Testing SAMPLE DATED; SAMPLE IDENTIFICATION; Prepared Waste Sample; Distilled water mixed witb 500 ppm ' of solids from the neutralization pit sludge. pH = 6.7 Initial Screening Evaluations Test No. '' Treatment Chemicals ./ . Type of Mixing Supernatant Turbidity after one minute of Settling 0 None 1 10 ppm Alum 2 2 5 ppm Alum 3 50 ppm Alum . - `. A A A 4 10 ppm FeCl3 5 25 ppm Fe Cl3 6 1 ppm Poly-Floe 1160 A A A 7 10 ppm Alum, 0. 5 ppm Poly-Floe 1100 B 8 25 ppm Alum, 1.0 ppm Poly-Floe 1100 B 9 25 ppm Alum, 0. 5 ppm Poly-Floe 1100 10 10 ppm FeCl3, 0. 5 ppm Poly-Floe 1100 B B 11 15 ppm SPY Clay, 0. 5 ppm Poly-Floe 1160 B 12 15 ppm SPV Clay, 1.0 ppm Poly-Floe 1160 B 13 25 ppm Alum, 1.0 ppm Poly-Floe 1100 c 14 25 ppm SPV Clay, 1. 0 ppm Poly-Floe 1160 C 15 25 ppm SPV Clay, 2. 0 ppm Poly-Floe 1160 C 16 25 ppm Alum, 2.0 ppm Poly-Floe 1100 C 17 15 ppm SPV Clay, 5. 1 ppm Poly-Floe 1170 C 18 15 ppm SPV Clay, 1.0 ppm Poly-Floe 1160 C 19 15 ppm SPV Clay, 5.1 ppm Poly-Floe 1170 C 20 15 ppm SPV Clay, 7.7 ppm Poly-Floe 1170 C 21 15 ppm SPV Clay, 3.8 ppm Poly-Floe 1170 C 22 15 ppm SPV Clay, 7.7 ppm Poly-Floe 1170 D 220 ppm . 110 ppm 70 ppm 74 ppm 137 ppm 150 ppm 58 ppm 99 ppm 6 5 ppm 88 ppm 115 ppm 137 ppm 121 ppm 117 ppm 95 ppm 95 ppm 58 ppm . 35 ppm 114 ppm 55 ppm 23 ppm 92 ppm 11 ppm DSW 345527 A - 5 minutes at 100 rpm and 15 minutes at 30 rpm. B - 2 minutes at 100 rpm for primary coagulant, 3 minutes at 100 rpm for flocculant (polymer), and 15 minutes at 30 rpm. ._ C - 1 minute at 100 rpm for alum or clay, 5 minutes at 100 rpm for flocculant, and 15 minutes at 30 rpm. D - 10 minutes at 100 rpm for flocculant after first adding clay. No slow mix. Flocculants *. Betz Poly-Floe 1100; anionic organic copolymer of acrylamide, white powder. Betz Poly-Floe 1160; cationic organic copolymer of acrylamide, white powder. Betz Poly-Floe 1170; strongly cationic organic polyamide, amber liquid. STLCOPCB4084155 ANALYSIS FOR Monsanto Company Anniston Alabama Analytical Data Sheet No. 3 Tnevose. Pennsylvania 19047 ' . Coagulation Jar Testing SAMPLE DATED: SAMPLE IDENTIFICATION: Prepared Waste Samples: Distilled water mixed with neutralization pit sludge at solids concentrations of 200, 500 and 800 ppm and pH adjusted, where shown, to 5. 0. Comparison of SPV and Coaguloid Clays Test No. Treatment Chemicals (1) Waste Sample Analysis Suspended Turbidity, Solids, ppm pH- ppm Supernatant Turbidity, ppm 1 Minute Settling 1 15 ppm SPV Clay 200 .6.8 102 2 and 500 6.8 220 3 7.7 ppm Fbly- Floe 117 0 800 6.8 380 ii : 12 13.5 4 5 ppm Coaguloid 200 6.8 102 5 Clay and 500 6.8 220 6 7.7 ppm Poly- Floe 1170 800 6.8 380 7 5 ppm Coaguloid 200 5.0 102 8 Clay and 500 5.0 220 9 7.7 ppm Poly- Floe 117 0 800 5.0 380 . 10 15 ppm SPV Clay 200 5.0 102 11 and 500 5.0 220 12 7.7 ppm Poly-Floe 1170 800 5.0 380 11 7. 8 24 16 9* 5 4 3 (1) All samples mixed for ten minutes at 100 rpm followed by one minute of settling prior to collection of supernatant sample for turbidity . measurement. ' n ' ENG1S2 S/68 '. ( '; '' . .; -. '- ' os'nw**8 . -- . STLCOPCB4084156 ANALYSIS FOR Monsanto Company Anniston . . Alabama . Analytical Data Sheet No. 4 S' TBEVQSE. PENNSYLVANIA 19047 SAMPLE DATED: _______Coagulation Jar Testing___________________ ' -_______.__________________ SAMPLE IDENTIFICATION: Effluent and Solids from Neutralization Pit Final Testing and Recommended Treatment (1) pH - Turbidity, ppm Suspended Solids, ppm WASTE SAMPLE; 500 ppm 7. 1 204 532 Supernatant Sample Analyses (2)~ Organic Carbon, ppm 52' Test No. Rapid Mix at 100 rpm 1 4 Minutes 2 7 Minutes 3 10 Minutes 7 24 6 26 2 16 WASTE SAMPLE; 1000 ppm 7.4 Supernatant Sample Analyses (2) Test No. Rapid Mix at 100 rpm 4 4 Minutes 5 7 Minutes 6 10 Minutes 400 6 3.5 1.5 1076 26 16 6 70 2 3 (1) All samples treated with 15 ppm SPV Bentonite Clay and 7.7 ppm of a cationic polyelectrolyte; Betz Poly-Floe 1170; (2) Samples collected after one (1) minute oi settling. . *' - oS\N 345529 -. EHSG1S2 S/68 '' .* . * ' STLCOPCB4084157