. Water & sewage works . little cars running on the railways overthe bed. September, I91S SEWAGE PURIKICATION AT ATLANTA, GA. 229 amount of sewage puttlini the filters is knownalmost exactly. The fifth photographshows a closer view ofthe surface of fhe brokenstone filter than can beseen in the fourth. Tht^sprinkler heads can beseen projecting slight))above the stone, and thoventilators which run withthe cowls moving with thewind are seen in the back-ground. When the sprinklers, ofthe Taylor type, are oper-ated under full head, thereis some overlapping of thesprays and recently someponding of s
. Water & sewage works . little cars running on the railways overthe bed. September, I91S SEWAGE PURIKICATION AT ATLANTA, GA. 229 amount of sewage puttlini the filters is knownalmost exactly. The fifth photographshows a closer view ofthe surface of fhe brokenstone filter than can beseen in the fourth. Tht^sprinkler heads can beseen projecting slight))above the stone, and thoventilators which run withthe cowls moving with thewind are seen in the back-ground. When the sprinklers, ofthe Taylor type, are oper-ated under full head, thereis some overlapping of thesprays and recently someponding of sewage uponthe surface has been ob-served, occurring mainlywtiere this overlapping oc-curs. This gathering ofwater does not indicatestoppage of the filter bedfurther than a small depthnear the surface, for avery slight stirring of thesurface stones causes thewater to disappear. The valves on the Sferv-Ice pipes to the sprinklershave been partly closed soas to reduce the maxi-mum head on them andthe overlapping V. THE SURFACE of the contact filter bed filled withbroken granite. The sprinkler heads which distributethe tank effluent over the surface of the filter are seenat the level of the surface of the bed. The ventilatingpipes from the bottom, of the bed. with their ivindlou-ls. are the most prominent feature of the Iiew. are given aThe areas nearer the sprinklerhead centers thus receive a greater sup-ply. Before this results in ponding it isexpected that the sluggish areas willhave renewed themselves and be readyfor full operation again. The throttlingof the discharge causes slower dischargefrom the dosing tank and reduces thetime between doses. This can be re-lieved somewhat by adjusting the lev-els of discharge in the dosing tanks. Al-tho a definite reason for the pondinghas not been assigned, it is hoped thatthe occasional variation in pressure atthe sprinkler heads and consequentchange in spread of the sprays will keepthe beds in good working order. A chemist i
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectsewerage, bookyear191
