Document Vowkq3YdLb7ybZ4mmvmr8nyw

EOME^VON F5C1ACJ. VREVOSS.' PENNSYLVANIA -.JO0,7 - JSUHI-'HO.N'J:. AREA ;6 :-!r.?-ssr;a December 29, 1970 Monsanto Company' . ' P.- O. Box 249 . Anniston, Alabama 36201 ' 1, ' . .. ' .* Attention: Mr. "W. F. Ta.ffee ' ' ' ` . Engineering Supervisor " .' ' : . ' .. ' V - ' . ... -' . . , '' ' * . . . '. ' ; ' . . . ' jt . . Re: Clarification of Neutralization ' Pit Effluent . Gentlemen: . - . 1. " 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, vMr. A, S. Freeman. .__ ' ' . . - Our la.boratory test results leads us to recommend a treatment consisting of a bentonite clay and a strongly cationic polyamide pqlyelectrolyte 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 i *. produced the'following quality of supernatant. . - . . ' t - .' v ' Initial Suspended Solids . Initial Turbidity Initial Organic Carbon ; . '*. PPm 532 204 52 ' ES51 1076 400 `TO . 0067359 TOWOLDMONOQ56507 , bOLYYi'S LACOAAIpAIEO. iHC. v.f.r -. f \ Supernatant Suspended Solids Supernatant Turbidity Supernatant Organic Carbon ' EE21 16-26 2-7 1-2 EHL 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 prepa.red waste sample had* * ' . V ' .' ' . ,. 0007360 TOWOLDMONOQ56508 \ 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 '' '' neutralisation pit effluent, f ' .' ; * '. . ,. : ' ' - . . . The initia.l jar test screening evaluations are summarised in ADS No. 2. ' Alum and ferric chloride at concentrations up to 50 and 25 ppm, respectively did riot 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 superna.tant 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 o.rder to permit comparison of the two clays on an equal cost basis. . . : . ' 0067361 * TOWOLDMONOQ56509 ft [13'ClTFg * LADOO*.1CHla, INC. J\ . - ' ' . ' # ` 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 '. '. .. ..'K clay and polyelectrolyte produced excellent results under the same test conditions. Pinal Testing and Recommended Treatment ... * c ^" 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 ........V..V.A1V1I.1 .C.a.j X C..A.....t.t..A.....l.U...V1l --i-.---V---.-yxLt v begirt, to further cv~---?-f.n this 0067362 TOWOLDMONOQ56510 ' WAT E R A N A LY S J 3 Monsanto Company Anniston Alabama SAMPLING POINT Gallon Sample Plant Affluent Total Hardness as CaCOj,_..ppjn_______ 310 Calcium as CaCOj, ppm---- --------------------- Maggnneessium as CaCps, ppm 220 90 Phenolphthalein Alkalinity as CaCOi, ppm Metbyl Orange Alkalinity as C?.CO:.. poiA 44 Sulfate as S04, ppm 60 Chiorideas Cl, ppm_ 224 Silica as Si02, ppm Total Phosphate as P04. ppm_____________ Ortho Phosphate as P04l_ppm___________ pH_____________ L_. Total Iron as Fe, ppm----------------------Biochemical Oxygen Demand, (BOD), ppm Chemical Oxygen Hemand, (COD), ppm _ 13. 5 0JL 0._1_ .6.6 0.20 16 42 Total Carbon, ppm 21 19 Inorganic Carbon, ppm 12 11 Organic Carbon! pom Specific Conductance Micromhos, 18C ,__ 650 Total Solids, ppm 708 Total Fixed Solids, ppm 296 Suspended Solids, ppm Suspended Fixed Solids, ppm Color Units 10 1 10 TREVOSE, PENNSYLVANIA 19047 sample dated: October 27, 1970 #1) Shaken Sample K21 Filtered Sample 0067363 I-_________ 1 TOWOLDMONOQ56511 DDLW^ CAOOrv*TOi*3. tNC. \: w Under separate cover we are submitting waste, supernatant,' and sludge samples collected during the tests shown in ADS No. 4. ..... We thanlc 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 . Project Engineer Consulting Division - 5- J . 0067364 TOWOLDMONOQ56512