Sewage disposal . PLAN ? t5cum Weir. Pipe to *5lt/dge 3eds ? cross-section a-a Typical Positivesludge separator and digestor _ l FOR FRC-SM 3EWRGF Approved 1000 house development Chief Engineer Scale /6=-l Housing Bureau UUNE,l2,l9ie Fig. 58. The Alvord Tank with Separate Sludge Digestion Chamber. 200 PRELIMINARY TREATMENT IN TWO-STORY TANKS tation tank can be controlled so as not to interfere with clari-fication of the sewage. This tank, it is believed, embodies theadvantages of the Imhoff tank without its disadvantages asregards foaming and fouling of the flow channels. Comparative Efficienc
Sewage disposal . PLAN ? t5cum Weir. Pipe to *5lt/dge 3eds ? cross-section a-a Typical Positivesludge separator and digestor _ l FOR FRC-SM 3EWRGF Approved 1000 house development Chief Engineer Scale /6=-l Housing Bureau UUNE,l2,l9ie Fig. 58. The Alvord Tank with Separate Sludge Digestion Chamber. 200 PRELIMINARY TREATMENT IN TWO-STORY TANKS tation tank can be controlled so as not to interfere with clari-fication of the sewage. This tank, it is believed, embodies theadvantages of the Imhoff tank without its disadvantages asregards foaming and fouling of the flow channels. Comparative Efficiency and Costs of Various PreliminaryTreatments. Coarse screening and a small detritus tank, for theremoval of the larger and heavier foreign bodies which find theirway into any sewerage system, may be considered as essentialin all disposal plants, except the very smallest. Beyond this,however, it may be an open question whether any other pre-liminary treatment is desirable, and, if so, which of the variousavailable methods shall be
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Keywords: ., bookcentury1900, bookdecade1910, bookpublisherlondo, bookyear1919
