Sewage disposal . purification,as shown below, of over 70 per cent, and have yielded an effluentoften less putrefactive than the water of the ship canal. TABLE LXIX EFFECT OF TREATMENT OF MANCHESTER SEWAGE ON CONTACT BEDSResults for the year ending March 30, 1904. (Parts >er million.) Source of sample. Ammonia N. Albu-minoid. Nitrogenas nitritesand ni-trates. Oxygenconsumed. Crude sewage Septic tank effluent Primary contact-bed effluent Average purification: On albuminoid N basis, 71 per cent. On oxygen-consumed basis, 73 per cent. 300 TREATMENT O
Sewage disposal . purification,as shown below, of over 70 per cent, and have yielded an effluentoften less putrefactive than the water of the ship canal. TABLE LXIX EFFECT OF TREATMENT OF MANCHESTER SEWAGE ON CONTACT BEDSResults for the year ending March 30, 1904. (Parts >er million.) Source of sample. Ammonia N. Albu-minoid. Nitrogenas nitritesand ni-trates. Oxygenconsumed. Crude sewage Septic tank effluent Primary contact-bed effluent Average purification: On albuminoid N basis, 71 per cent. On oxygen-consumed basis, 73 per cent. 300 TREATMENT OF SEWAGE IN CONTACT BEDS During the first years of the working of the plant, owing largelyto the amount of suspended matter in the effluent from the septictank, Mr. Fowler anticipated that it would be necessary to washand replace the filling material, and in 1907 the beds were cloggedto such a degree that it was considered desirable to remove thefilling material, wash it, and, after replacing the loss of material,. Fig. 82. Filling Contact Beds at Manchester. to refill the beds. This was done at an average expense of about31 cents per cubic yard. Cost data of great value have been accumulated at amount of money to be spent for the construction, includingthe original works for precipitation, aggregated about three mil-lion dollars. The first cost of building the contact beds, includingexcavation, underdraining, laying concrete and putting fillingmaterial in place, was $33,000 per acre. The filling materialin place cost 87 cents per cubic yard. The cost of removingfilling material, washing and replacing it, and making good the EXPERIENCE WITH CONTACT BEDS AT MANCHESTER 301 fine material lost in washing, brings the total cost of renewalup to about 50 per cent of the of filling. The generaloperating costs of the plant are tabulated below from the figuresfor 1906-1907: TABLE LXX WORKING COSTS OF TWELVE PRIMARY CONTACT BEDS AT MANCHESTER (Eng. News, 1908.) A
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