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R:: , <br /> ..�e;� <br /> EASTYIAN KODAK COMPANY <br /> R��CNESTER, NEW YORK 14650 <br /> ILLCPHONL <br /> n �51 • . .i,� .. 1. . .e� ' <br /> ecrrv, r•aK : v. i . /�REA cou[ TG <S���tWO <br /> October 13, 1972 <br /> CALCUT.ATF.D COPTPOSITION OF PHOTOGRAPHIC PROCESSING EFPLUENT PREPARF.D FOR: <br /> Naturalike <br /> 2421 Hewitt Avenue <br /> �verett, Washington <br /> The following inforntation is provided in response to a requese from <br /> Mr. Don Barnes. <br /> The Icind and cnncentration of materials in process effluents depend on a <br /> iiumber of factors such as the type and maaufacture of f-ilm or paper an�i <br /> chemicals , the mix and voltane ef products, the type of process, replen- <br /> ishcnent rates, dilution rates, regeneration and reuse practices , and <br /> ��ther factor, . For the for.egoing reasons , it is impoasi.ble for us to <br /> ��re_licL precisely your total effluent concentrations . 'I'he only way to <br /> do that reliauly is Uy chemical analysis of representative samples of <br /> the effluent . Recognizing that it is not always possible to obtain <br /> representative samples and that test methods are not available for all <br /> constituents , the aLternative of calculating an approximate composition <br /> may be useful. <br /> The computer calculations arc based on t!re questionnaire �.nput data <br /> supplied by your laboratory (copy enclosed) � If the data were incomplete, <br /> we used replenisher farmulas and rates xecommended by Kodak. Estimates <br /> of amounts of solutions that were regenerated or reused are shown in <br /> 1'able I. If the lauoratory practices are changed to significantly alter <br /> �hnse values , new calculations should be made, <br /> The attached computer printout is cal.culated from the processing chemicals <br /> ancl wash waters only. For the purpose of this calculation, it has been <br /> assumed that no chemicals are leached out of the film or paper, Actually, <br /> silver and bromide and very small traces of other materials are removed <br /> from the photographic product during processing. However, we have no <br /> way of estimating how mueh silver is recovered in your laboratory, thus <br /> no estimate of silver concentration in the overall effluent can be <br /> made. The bromide calculations are made from the bromide content of <br /> the replenishers only, With the exception of silver ion, the concen- <br /> tratinn of most malerials removed from tilms or papers that may be in <br /> tl:e waste effluent. is not lilcel.y to be high enough to Uc of coneern . <br /> '� K : <br /> ��crsia3: <br />