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The waste sludge production from a trickling-filter plant is 12.5 m^3/d containing 620 kg of solids (70% volatile). The proposed anaerobic digester design to stabilize this waste consists of two floating-cover heated tanks, each with a volume of 480 m^3 when the convers are fully raised and a volume of 310 m^3 with the covers rsting on the landing brackets.
(a) Caluclate the digester volume per equivalent population with the covers fully raised. Assume 100g of solids production per capita.
(b) Calculate the digester loading in terms of kg volatile solids fed/m^3 of tank volume below the landing brackets/day.
(c) Calculate the digested sludge storage time available between lowered and rasied cover positions. Assume a volatile solids reduction of 60% during digestion and a digested-sludge moisture content of 93%.
HOCL is added to water in a tank as a disinfectant. after equilibrium is reached it is found that the pH of the water in the tank is 8.2 and the gas phase partial pressure is the head space of the tank is 0.2E-7 atm. (not: henry's law constant for..
Aerotron Electronics is considering purchasing a water filtration system to assist in circuit board manufacturing. The system costs $40,000. It has an expected life of 7 years at which time its salvage value will be $7,500.
In Chlorine disinfection (3-log reduction in Giardia- Cysts), determine the water pH for a contact time of 90 minutes using a chlorine concentration of 2 mg/L at 20 degrees C
The casting has a mass of 3 Mg. Suspended in a vertical position and initially at rest, it is given an upward speed of V mm/s in 0.3s using a crane hook H. Determine the tension in cables AC and AB during this time interval if the acceleration is ..
how many cubic yards of aggregate must be ordered for a road base 16 inches thick and 2000 feet long with a top width of 30 ft, if the side slopes are one on one, or 45 degree
The sign is attached to the post that is built-in at the ground. Treat the sign as having uniform mass. Neglect the contribution of the post weight. The length d is from the center plane of the sign to the center of the post.
Create a simple federated BIM model of a Pedestrian footbridge for the Campus - This is for the primary purpose of delivering BIM asset information to the project team at Project Concept Stage.
To avoid boredom, employees are assigned all three tasks at different times during the shift. Each employee has to work at least half an hour at each station during a five hour shift. How much time should each employee spend at each in order to maxim..
Is it possible (in this part of the world) for the sun to ever shine directly upon the OUTSIDE of a NORTH-facing wall of a home or other building? If so when?
Soil is excavated from a borrow to construct an embankment with a net volume of 50,000 cy with 95% of Modified Proctor maximum dry density of 110 pcf with a Modified Proctor optimum water content of 8%.
A temporary diversion has been constructed on a highway of +4 percent gradient due to major repairs that are being undertaken on a bridge. The maximum speed allowed on the diversion is 10 mph.
Determine the velocities and u and w and the speed of the flow along the streamline at (3,2). Determine the slope of the streamline in degrees from horizontal. Determine the acceleration at the point. Determine the pressure at the point (3,2) in N/m2..
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