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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%.
A 100 ft cut steel tape was used to check the layout of a building wall. the rear surveyor held 42 ft while the head surveyor cut 0.33 ft. what is the distance measured?
A water pipe, in diameter id located in a trench 450mm below the center of the slab. The trench running along the length of the slab,300mm wide and 450mm deep, was backfilled with the same soil. If this pipe were to leak, what effect would it have..
A small house is built in the arctic. It has four square walls of 500 ft2 each. For simplicity, we will assume it has no windows, and we are only interested in calculation the heat loss through the four walls. A total of one hundred Watts (100 kW)..
What should TAC , TAB and the acute angle ? between TAB and the vertical to minimize the tension TAB ? Take o and W = 1,000 N. Hint: Consider various possible force triangles and decide on inspection how to minimize TAB.
Imagine a virtual expressway having 3 lanes. The administrating agency wants to detect traffic accidents in 5 minutes wherever they occur to dispatch an emergency response unit.
Which material will result in the lightest member if you want to limit the elongation to 0.20 in.? Which material will be cheaper under these conditions?
A 20 kg package is at rest on an incline when a force P is applied to it. Determine the magnitude of P if 10 seconds is required for the package to travel 5 m up the incline. The static and kinetic coefficients of friction between the package and ..
Determine the force required to lift the block of stone that weighs 200 lb. The rollers are frictionless and the static coefficient between all other surfaces is 0.3. Neglect the size and weight of the wedges.
Due to temperature change, a 1/32" hole mismatching occurred. What is the pulling force, in lbs, to be applied for one of the plates to match the two holes The plate length is 3 ft (from the left end to the hole) and its cross section is 1/8" x 1"..
A footing 3m X 3m carries a pressure of 500 kN/ m2 at a depth of 1m in a sand substrate. The saturated unit weight of the sand is 20 kN/ m3 and the unit weight above the water table is 18 kN/ m3.
You are asked to design a winch system for Santa's sleigh. Assume that Santa weighs 300 lbs, visits 10 houses an hour and requires a 20 foot lift at each house, what is the average power that the system will use if it is perfectly efficient? Express ..
What are the three meterials based on the predominant types of bond and what are the predominant types of bond in each category?
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