Handbook of Civil Engineering Calculations

Therefore, the volume of thickened waste activated sludge exiting the gravity belt thick- ener is 11,502 gal/day (43.5 m 3 /d) a ...

Calculation Procedure: Find the daily volume of sludge for disposal Factors that must be considered in designing aerobic digest ...

Determine the required VSS reduction The sludge age required for winter conditions is obtained from Fig. 3 using the minimum wi ...

(1258 Ib VSS/d)(2.3 Ib O 2 Ab VSS) = 2893 Ib O 2 /d (1313.4 kg/d) The volume of air required at standard conditions (14.7 lb/in^ ...

X= Digester total suspended solids, mg/L Kj= Reaction rate constant, d~ l . May range from 0.05 d~ l at 15 0 C (59 0 F) to 0.14 ...

will be removed. If the velocity is too great, grit will be carried out of the chamber. If the velocity is too small, organic ma ...

Advantages The same efficiency of grit removal is possible over a wide flow range. Head loss through the grit chamber is minimal ...

DESIGN OF A SOLID-BOWL CENTRIFUGE FOR SLUDGE DEWATERING A 4.0 Mgd (15,140 m 3 /d) municipal wastewater treatment facility produc ...

Using Table 1, the number of centrifuges recommended for a 4.0 Mgd (15,410 m 3 /d) waste water treatment facility is one operati ...

R = 100(25/5) ["(5 _°Q3) 1 = 95.14% Determine the Dewatered Sludge Cake Discharge Rate The dewatered sludge (cake) discharge ra ...

considerations. Operating at higher speeds helps achieve optimum performance which is weighed against somewhat greater operating ...

Polymer feed rate in gal/h is calculated using the following: polymer feed rate Ib/h) Polymer feed rate (gal/h) = ,0<t. lL/ f ...

Filtration in a traveling bridge filter is accomplished at a hydraulic loading typically in the range of 1.5 to 3.0 gal/min per ...

Find the required filter surface area Filter surface area required is calculated using TT-U f • ,!/A^ peak flow (gal/min) Filt ...

DESIGN OFA RAPID-MIX BASIN AND FLOCCULATION BASIN 1.0 Mdg (3785 m 3 /d) of equalized secondary effluent from a municipal waste w ...

where G = Mean velocity gradient (s l ) P = Power requirement (ft-lb/s) (kW) fju = Dynamic viscosity (lb-s/ft^2 ) (Pa-s) V= Volu ...

SIZING A POLYMER DILUTION/ FEED SYSTEM 1.0 Mgd (3,785 m 3 /d) of equalized secondary effluent from a municipal wastewater treat- ...

Find the quantity of neat polymer required The quantity of neat polymer required is calculated as follows: , , „ N active poly ...

FIGURE 7. Cutaway view of a trickling filter. (Metcalf & Eddy, Wastewater Engineer- ing: Treatment, Disposal, and Reuse, 3rd ...

Also, overall efficiency = El+ E 2 (I -E 1 ), and E 1 =E 2. where E 1 = The efficiency of the first filter stage, including reci ...