. Lavori pubblici . i rsons che contribuiscono al sistema fognario averageabout 140. Il flusso di liquame varia notevolmente su giorni differenti.quando la lavanderia è operata, il flusso giornaliero totale ammonta a circa 10,000 galloni, 60 per cento di whichecrun fuori in circa 6 ore. In tutti gli altri giorni, il totalflow ammonta a aliout 4,0()() galloni. E F. R. BERLJN.» e operazione, è stato deciso di costruire una nuova sanitarysewer e utilizzare la vecchia fogna solo per il tetto e drenaggio delle acque piovane, diminuendo così la dimensione della pianta e di conseguenza il costo, e facilitare la loro op-erazione. Serbatoio Imhoff.

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. Public works . rsons contributing to the sewer system will averageabout 140. The sewage flow varies considerably on different days.When the laundry is being operated, the total daily flowamounts to about 10, 000 gallons, 60 per cent of whichruns off in about 6 hours. On all other days, the totalflow amounts to aliout 4, 0()() gallons. and F. R. BERLJN.» and operation, it was decided to build a new sanitarysewer and use the old sewer for the roof and stormwater drainage only, thereby decreasing the size of theplant and consequently the cost, and facilitating the op-eration thereof. Imhoff Tank. For simplicity and economy, the Imhofftank was built rectangular with extended ends. Thetank, which is of the horizontal flow type, was construc-ted of reinforced concrete using a 1:2:4 mixture for themain walls and a 1:1>2:3 mixture for the 4-inch dia-phragm walls and the baftIe. A section of the tank isshown in Fig. 2. The excavation was a hard clay whichrequired no shoring, and which was all done by hand.. GENERAL VIEW OF DISPOSAL PLANT, I.MIImI-i The plant consists of an Imhoff tank, dosing chamber, percolating filter, secondary tank and sand filter, asshown on the general plan. Both the sewer system andthe treatment plant operate by gravity. The Home sewer system formerly emptied into a smallstream flowing through the property. This stream is abranch of Chester creek, which flows through a countrywhere dairy farming is carried on quite extensively;hence it was at once evident that a plant must be builtwhich would give a high degree of purification. To se-cure this, a complete plant was necessary, the building ofwhich entailed considerable expense on the Home:therefore, the prime idea was to simplify the design, thereby keeping the cost of construction and operationas low as possible. The average flow of the stream intowhich the effluent is discharged is sufficient to produce adilution ratio of about 1:10. The old sewer system wasof the combined type, and in order to hav

Parole chiave associate all'immagine

• bookcentury1800
• bookdecade1890
• bookidpublicworks3
• bookyear1896