. The Journal of hygiene. uch a position wassuitable or unsuitable for shell-fish layings. W. G. Savage 147 The following investigation deals with the results of a series ofexaminations of mud from a tidal river which has extensive oyster bedsin creeks opening near the mouth of the river and beds also in themouth of the river. About 8 miles from the mouth is a town of 40,000inhabitants, which discharges its sewage into the river about a milelower down. The sewer outfall is rather over 7 miles from the mouthof the river (see Map). The only sources of pollution of this stretch of tidal river are
. The Journal of hygiene. uch a position wassuitable or unsuitable for shell-fish layings. W. G. Savage 147 The following investigation deals with the results of a series ofexaminations of mud from a tidal river which has extensive oyster bedsin creeks opening near the mouth of the river and beds also in themouth of the river. About 8 miles from the mouth is a town of 40,000inhabitants, which discharges its sewage into the river about a milelower down. The sewer outfall is rather over 7 miles from the mouthof the river (see Map). The only sources of pollution of this stretch of tidal river are asfollows : (1) The sewage of the town C. This is discharged into the riveras above stated, but after treatment, while the plant is sufficiently largeto enable the effluent to be discharged only on an ebb tide. Themethod of treatment consists of sedimentation in six large settling tanksfollowed by bacterial treatment in coke breeze and clinker beds (contactbeds). The average amount of sewage dealt with is about 1,000,000. 10—2 148 Bacterioloffy of Tided Mud gallons per day. The sludge from the sedimentation tanks does notrun into the river, but is pressed into cakes and deposited on the effluent has alwajs been clear when I have examined it andwill keep indefinitely without putrefactive odoui-s developing. (2) From a village (R on map) about 1^- miles below the seweroutfall of the town C small drains discharge into the river. Also jmile below R but on the opposite side of the river, the drainage ofanother small place (W on map) with a population of 2,600, passes intothe river. Both W and R, however, have very few water-closets, and most ofthe privy contents finds its way directly on to land far away from theriver. (3) The drainage of the small town B (population about 4,600) isdischarged into the mouth of the river by means of a single outfall, ona point 110 feet from the shore but above the low-water mark. Theposition was selected for the outfall after float experi
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Keywords: ., bookcentury1900, bookdecade1900, booksubjecthygiene, bookyear1901
