Environmental Engineering FOURTH EDITION

224 ENVIRONMENTAL ENGINEERING i- Sludge Figure 10-14. Capillary suction time apparatus. and onto a blotter. The speed at which t ...

Sludge Treatment and Disposal 225 L - Bowl length B - Beach length D - Bowl diameter 2- Pool depth S - Scroll pitch a - Beach an ...

226 ENVIRONMENTAL ENGINEERING calculated as (10.8) where w = rotational speed of bowl (rads), g = gravitational constant (m/s2), ...

Sludge Treatment and Disposal 227 similar machine would perform equally well. The machine variables are: Machine 1 Machine 2 Bow ...

228 ENVIRONMENTAL ENGINEERING Thus Q2= ” Q1 = -(OS) 16.8 = 3.2m3/h. 2.78 Next, looking at the solids loading (beta), the solids ...

Sludge Treatment and Disposal 229 Cooling air discharge Combustion zone Figure 10-16. Multiple-hearth incinerator. (Courtesy of ...

230 ENVRONMENTN., ENGNERING have proven most successful. Mixed digested sludges have been spread from tank trucks, and activated ...

Sludge Treatment and Disposal 23 1 PROBLEMS 10.1 Using reasonable values, estimate the sludge production in a 10-mgd wastewater ...

232 ENVIRONMENTAL ENGINEERING 10.7 Tivo geometrically similar centrifuges have the following machine characteristics: Machine 1 ...

Chapter 11 Nonpoint Source Water Pollution As rain falls and strikes the ground a complex runoff process begins, carrying with i ...

...

Nonpoint Source Water Pollution 235 water-soluble pesticides, and nitrogen-based plant nutrients (ammonia, nitrite, and nitrate) ...

236 ENVIRONMENTAL ENGINEERING in determining when sheetwash erosion will occur. A gentle summer shower is less likely to result ...

Nonpoint Some Water Pollution 237 Figure 11-1. Average annual rainfall erosivity indices (R) for the USA. LS = topographic facto ...

238 ENVIRONMEN'IAL, ENGINEERING indicates soil with: 65% silt and very fine sand 5% sand (O.lW2.0 mm) 3% organic matter Fine gra ...

Nonpoint Source Water Pollution Slope length, meters 239 20.0 10.0 8.0 6.0 4.0 3 3.0 L- Q 2.0 g 1.0 Q 0.8 d n c .-^0 !- 0.6 0.4 ...

240 ENVIRONMENTALENGINEERTNG able 11-3. Vegetation Cover Factors (C) for Various Types of Ground Covef Land use groups Examples ...

Nonpoint Source Water Pollution 241 Table 11-4. P Values for Erosion Control Practices on Croplanda Type of control practice Cro ...

242 ENVIRONMENTAL ENGINEEFUNG Protection Agency (USEPA) and the USDA have developed a training module for learning agricultural ...

Nonpoint Source Water Pollution 243 at the site may exceed the local need for crop fertilizers. Converting the animal waste into ...