The Operation of Sewage Disposal Plants: A Manual for the Practical Management of Sewage Disposal Works, with Suggestions as to Improvements in Design Hardback -

He must be able to tell when his tanks are beginning to let over an undue amount of suspended matter, indicat ing that a removal of stored up Sludge is desirable or necessary. He must know when his various forms of feed or dosing apparatus are working properly, and how to make proper adjustments as soon as a siphon or other apparatus gets out of order. In one of his rounds the writer discovered a suspicious appearance at the outlet of one of four contact beds. The attendant assured him that each bed was working perfectly as he had been at the plant daily for weeks. Upon close investigation the writer found that the discharge Siphon in the bed noted was out of order so that at every round this bed did not hold but allowed the dose to run right through without any purification. This had been going on for weeks, almost undoing the work of the other three beds, which were'turning out a good effluent, and the attendant was none the wiser.

In order to get the highest efficiency from our sewage disposal plants as they now exist, the attendants must be taught the necessary fundamentals or be displaced by specially trained men. Many a plant when new does not appear to require skilled attention because it is usu ally of such a Size that a future growth of the town for which it was built has been provided for and, therefore, the duty imposed upon the treatment units is compara tively light. The final effluent of such a plant is usually excellent, although in many cases the writer has seen this produced almost wholly by the final sand filters be: cause the preliminary treatment units or the contact beds had not been operated so as to perform their share of the work. Sooner or later such a plant becomes more heavily loaded and then trouble begins and corrective measures are oftentimes costly.

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