Sewage disposal . ach bed; 4 hourscontact during a portion of the time (Leeds, 1900). §§ Leicester: Process No. 14; experiments during November, 1898, to July, 1899; primarybeds, jjj acre in area, filled with clinker l{ to 2| inches, 4| feet deep; secondary bed, BV acre in area,filled with 3 feet of clinker, | to i inch; rate, on each bed, septic sewage (Leicester, 1900). || Manchester: Experiments during January 4, 1900, to March 27, 1901; A and C were pri-mary beds, the combined effluents of which were run on to D, area of each bed, 7V acre on thesurface; slope inward, 2:1. A contains 3
Sewage disposal . ach bed; 4 hourscontact during a portion of the time (Leeds, 1900). §§ Leicester: Process No. 14; experiments during November, 1898, to July, 1899; primarybeds, jjj acre in area, filled with clinker l{ to 2| inches, 4| feet deep; secondary bed, BV acre in area,filled with 3 feet of clinker, | to i inch; rate, on each bed, septic sewage (Leicester, 1900). || Manchester: Experiments during January 4, 1900, to March 27, 1901; A and C were pri-mary beds, the combined effluents of which were run on to D, area of each bed, 7V acre on thesurface; slope inward, 2:1. A contains 3 feet of clinker § to f inch; septic sewage at rate of contains 3 feet of clinker J to | inch; septic sewage at rate of D contains 3 feet of clinkerI to i inch; rate, (Manchester, 1901). IHI Sutton: Experiments from October, 1897, to August, 1898, coarse bed 3 feet deep, of burntballast; 5 beds of burnt clay; rate in each bed, 1 (R. S. C, 1902). Rates expressed in million gallons per acre per Raw Sesvage PrimaryEffluent Secondary-Effluent Fig. 80. Purification Effected by Single and Double Contact Beds. 288 TREATMENT OF SEWAGE IN CONTACT BEDS a purification on the first-contact effluent. Aylesbury andBlackburn show the worst results among the English plants asfar as ratio of purification is concerned. It will be noticed thatthese are the weakest sewages, and in all sewage treatment thelast fractions of organic matter are the most difficult to at Lawrence the nitrate content of the effluent is ratherlow, notably at Leeds and Leicester. The effluent of the first-contact process, as is obvious fromthe analyses in Table LXI, generally contains too much organicmatter to be considered as satisfactorily purified, while two suc-cessive treatments produce, as a rule, an effluent which is non-putrescible. Double contact is also more effective than a singletreatment at half the rate, as indicated by the Manchester resultstabulated below; and a double-c
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