A Study of Factors Affecting the Efficiency And Design of Farm Septic Tanks

Cover A Study of Factors Affecting the Efficiency And Design of Farm Septic Tanks
A Study of Factors Affecting the Efficiency And Design of Farm Septic Tanks
E W Emil Wilhelm Lehmann
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21 cu. Ft. 43. 5 "The tanks were put in operation November 22, 1922, and the above measurements made December 17, 1923.
TABLE 8. SCUM AND SLUDGE ACCUMULATION IN CHAMBERS OF TANKS TREATING FARM SEWAGE DURING STUDY OF SINGLE- AND MULTIPLE-CHAMBER SEPTIC TANKS 1 Chamber No Dl D2 D3 El E2 (4'x3') (4'x3') (4'x3') (8'x3') (4'x3') Depth of scum ft. . 63 ft. . 01 ft. 0. 00 ft. . 21 ft. . 02 . 40 . 50 1 . 60 . 40 1. 03 . 51 . 81 . 42 Volume of scum and sludge cu. Ft. 12. 4 CU. Ft.
6. 1 cu, . Ft. 19. 4 c
...u. Ft.
5. 05 "The tanks were put into operation November 16 and 18, 1922, and the above measurements were made December 17, 1923.
'The sludge in chamber D3 was less than . 4 foot deep and could not be measured conveniently.
period and distribution of scum and sludge in each chamber of the two-chamber tank was most favorable for settlement and digestion of solids by bacterial action. The advantage of the two- and three- chamber tanks over the single-chamber was no doubt due to additional baffling ; furthermore, most of the sludge in the two- and three-cham- ber tanks was stored in the first chambers, and considerable gassing and disturbance was thereby eliminated near the outlet of these tanks (Table 7).


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