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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%.
The flow rate of water through a 8 meter wide channel is controlled by a sluice gate. The flow depths are measured to be 1.3 and 0.45 meters upstream and downstream from the gates. Determine force acting on the sluice gate
Perform a material balance on substrate (S) around a chemostat (completely mixed reactor without recycle) assuming a first-order removal for a substrate with a rate constant of 0.5 hr-1.
(a) Describe the following types of Fe-C martensites that occure in plain-carbon steels: (i) lath martensite, (ii) plate martensite. (b) Describe some of the characteristics of the Fe-C martensite transformation
Consider a mass of air at 18 ºC, which is located at 1,000 m. above mean sea level. A strong wind moves the air mass over a mountain range at 2,500 m. mean sea level and then the air descends to an elevation of 500 m on the leeward
A dry cleaning establishment buys 500 gal of carbon tetrachloride every month. as a result of the dry cleaning operation, most of this is lost to the atmosphere and only 50 gal remain to be disposed of.
The drinking water needs of an office are met by large water bottles. One end of a .25 in diameter plastic hose is inserted into the bottle placed on a high stand, while the other end with an on/off valve is maintained 2 ft below th bottom of the bot..
Define the meaningof C•t product. In addition to Cand t, what factors influence the rate of chemical disinfection? What kind of microorganism is most readily inactivated byfree chlorine? What kind is most difficultto inactivate?
the j-shaped member shown in the figure is supported by a cable de and a single journal bearing with a square shaft at
A train starts from rest at station A and accelerates at 0.5m/s^2 for 60s. Afterwards it travels with a constant velocity for 25min. It then decelerates at 1 m/s^2 until it is brought to rest at station B. Determine the distance between the stations
A company manufactures a brand of light bulbs with a lifetime in month that is normally distribute with a mean=3 and a variance=1. A consumer buys a number of these bulbs with the intention of replacing them successively as they burn out.
A fire has destroyed thousands of acres of forest. Seedlings have been planted in the area but are being destroyed by the local wildlife. Develop a way to reforest the region by preventing the wildlife from eating the seedlings
Assuming that the average stack gas velocity is 10.0 m/s and stack is circular with a 3.0 meter diameter, calculate the mass emissions rate of NO2 in kg/day.
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