Handbook of Civil Engineering Calculations

FIGURE 13. Hydraulic elements of a circular pipe, Compute the half-full flow depth Determine the full-flow capacity of this 24- ...

Note that Figs. 12 and 13 can be used whenever two variables are known. When a sewer flows at 0.8, or more, full, the partial-fl ...

TABLE 16. Weight of Pipe-Trench Fill Fill lb/ft^3 kg/m^3 Dry sand 100 1601 Damp sand 115 1841 Wet sand 120 1921 Damp clay 120 19 ...

Select the bedding method for the pipe Figure 14 shows methods for bedding sewer pipe and the strength developed. Thus, earth e ...

TABLE 18. Proportion of Short Loads Reaching Pipe in Trenches Depth-to- Sand and damp Saturated Damp Saturated width ratio topso ...

and piles of sand, coal, gravel, etc. Table 19 shows the proportion of long loads transmit- ted to buried pipes. Use the same pr ...

TABLE 20. Storm-Sewer Inlet Capacity per Foot (Meter) of Length Depression Capacity per foot Flow depth in depth, in length, fVV ...

FIGURE 15. Typical storm-sewer plot plan and layout diagram. that the inlet pipe will slope 1 ft in 20 ft (0.3 m in 6.1 m) of le ...

TABLE 21. Minimum Slope of Sewers* Sewer Minimum slope, ft/ diameter, 1OO ft (m/30.5 m) in (mm) of length 4(102) 1.20(0.366) 6(1 ...

SECTION 8 SANITARY WASTEWATER TREATMENT AND CONTROL KEVIN D. WILLS, M.S.E., P.E. Consulting Engineer Stanley Consultants, Inc. D ...

Calculation Procedure: Compute the reactor volume The volume of the reactor can be determined using the following equation deri ...

The increase in MLVSS is computed using the following equation: P* = Y 0 bsQ(So - S)(8-34 Ib/Mgal/mg/L) where Px is the net wast ...

ment be designed with a safety factor of at least 2. Therefore, in sizing aeration equipment a value of (2)(6816 Ib O 2 AI) - 13 ...

tivated Sludge (WAS). As outlined previously in Part 5 "Compute the Food to Microor- ganism Ratio and the Volumetric Loading," t ...

FIGURE 2. Aeration tank mass balance. gesters, etc.) is not 100 percent and some solids are returned, the actual wasting rate wi ...

(b) Waste Activated Sludge (WAS) pumping rate from the aeration tank. If the mean cell residence time is used for process contro ...

(4500 mg/L)(4^0 Mgd - 0.104 Mgd) = *r 8000 mg/L-4500 mg/L^5 v ' The ratio of RAS pumping rate to influent flow rate, or recircul ...

riorate if solids loading is increased beyond the characteristic value for the suspension. Without extensive experimental work c ...

Solids (Ib/d) = (4.0 Mgd + 5.0 Mgd)(4,500 mg/L) (8.34 Ib L/mg-Mgal) = 337,770 Ib/d = 14,074 Ib/h (6389.6 kg/h) Therefore, the so ...

Daily Rate: (27,531 lb/wk)/(5 d/wk) = 5506 Ib/d (2499.7 kg/d) Hourly Rate: (5506 lb/d)/(6 h/d) = 918 Ib/h (416.8 kg/h) Size the ...