Journal . therefore it became imijortant todetermine, if possible, the minimum air supplynecessary for the maintenance of the purificationprocess. volume of sludge m each vessel was strictly one-fourth of the voluuie of sewage dealt with. Throughthe three aerating chambers, on the average 13,27, and 6 cubic feet of air per hour per squarefoot, etc., WCre passed respectively for a period of4 hours, when samples were taken and the oxida-tion effected in each was determined l)y arrange for the respective mixtures of sludgeand sewage to receive the required amounts of air,the aerating
Journal . therefore it became imijortant todetermine, if possible, the minimum air supplynecessary for the maintenance of the purificationprocess. volume of sludge m each vessel was strictly one-fourth of the voluuie of sewage dealt with. Throughthe three aerating chambers, on the average 13,27, and 6 cubic feet of air per hour per squarefoot, etc., WCre passed respectively for a period of4 hours, when samples were taken and the oxida-tion effected in each was determined l)y arrange for the respective mixtures of sludgeand sewage to receive the required amounts of air,the aerating vessels before each experiment werefilled with tap \\ater and the mercury regulation Vol. No. 18.] ARDERN & LOCKETT—OXIDATION OF SEWAGE WITHOUT AID OF FILTERS. 941 columns roughly adjustoil to allow the reqviiroilamounts of air to pass tlirouijh the porous finer adjustment was then made according to themeasurements, of the amoiuits of free air issuingfrom each vessel. Main Air Supply. DiAGBAU II. ShowLUg arranf^nient for reffulnting air supply. Having fixed the mercury levels so that therequired amount of air for each vessel was obtained,the tap water was replaced by the mixture ofsludge and sewage. Throughout the experimentsparticular care was taken that the amount ofair passing through the liquids per minute shouldbe fairly constant for each ^•essel, and carefulmeasurements of the amounts of free air were maileat least twice during each experiment. The following table contains the average resultsof a series of experiments using :—(1) the usual ;(2) excessive ; (3) reduced amounts of air. Table V. Manchester sewage. Results in parts per 100,000. Rawsewage. Effluents obtained after 4hoiu-s aeration. Usualair-supply. Excessive air-supply. Reducedair- supply. Four hours oxygenabsorption 0123-320-84 1-54)030-121-56 13 1-631030131-44 27 1-40 Free and saline ammoniaAlbuminoid ammonia ...Kitrltc and nitrate as Nil, Average amount of airused in culjic ft. per sn
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectchemist, bookyear1882
