Handbook of Civil Engineering Calculations

71.2 = 1QQ — V= 18.51 103 ft^3 (523.8 m^3 ) 1+0.0561 /2,2002 Ib/d V F(2.08) Using the given depth of 7 feet (2.1 m), and a circu ...

BOD 5 loading for a first stage filter in a two stage system typically ranges from 60 to 120 lb/10 3 ft 3 -d (0.96 to 1.93 kg/m ...

ity constant must first be adjusted for both the temperature of the wastewater and the depth of the actual filter. Adjustment fo ...

/ -In(S 6 IS 1 ) \ i/n ™ (kw2s)D ) Using values from above, the area and diameter of the trickling filter are A = 694 gal/min ( ...

TABLE 2. Typical Dosing Rates for Trickling Filters Organic loading Ib BOD 5 /! O^3 Dosing rate, ft^3 -d (kg/m^2 -d) in/pass (cm ...

FIGURE 9. Sludge handling system. generally located so as to have a suction head as shown in Fig. 9. A schematic of a rotary lob ...

Using values given above, the dynamic head loss in the piping system at the design flow rate of 26 gal/min (1.64 L/s) is: / 100 ...

26 gal/min Vel°dty = (7.48 gal/tfX(^4 X^3 in/12 in/ft)')(60 s/min) = L2 *" (0' (^37) "^ Using Fig. 11 with a velocity of 1.2 ft/ ...

FIGURE 12. Pump performance curve (A If a Laval Pumps, Inc.) TDH was calculated above to be 26 lb/in^2 (179.1 kPa); Sf= (25 gal/ ...

TABLE 3. Viscosity of Sewage Sludge vs. Percent Solids Percent solids Viscosity in centipoise (cp) 1 1 0 2 8 0 3 25 0 4 56 0 5 1 ...

Calculation Procedure: Determine the required digester volume and loading Anaerobic digestion is one of the oldest processes us ...

The BOD entering the digester 25,000 Ib/d (11,350 kg/d). Therefore, the volumetric load- ing to the digester is Volumetric Loadi ...

Using values obtained above: ,.. [(25,0OO Ib/d) - (10,000 Ib/d) - 1.42(621 lb/d)] o/o Stab^on = ± 25,000 lb/d ' ~ x 100 = 56.5% ...

1+0.23Qf = 36.84 Q= 155.8 mg-min/L For a residence time of 15 minutes, the required residual is Ct = (155.8 mg-min/L)/15 min = 1 ...

FIGURE 14. Compound-loop chlorination system flow diagram. Calculation Procedure: Compute the sanitary sewage flow rate Table 4 ...

TABLE 4. Sanitary Sewer Design Factors Population data Typical population Type of area Per acre Per km^2 Light residential 15 3, ...

at n = 0.013 and Cf= 78.5, and project to the exact or next higher value of Cf. Table 5 shows that C 7 Is 64.70 for 15-in (381-m ...

of 150 percent of the average annual demand and maximum hourly demands of 200 to 250 percent of the annual average demand are co ...

ical oxygen demand be reduced 90 percent. The plant will handle only domestic sanitary sewage. What are the daily oxygen demand ...

TABLE 6. Typical Efficiencies of Sewage-Treatment Methods* Percentage reduction Suspended Treatment matter BOD Bacteria Fine scr ...