Solid Waste Engineering
3rd Edition
ISBN: 9781305888357
Author: Worrell
Publisher: Cengage
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Chapter 6, Problem 6.2P
To determine
The fraction of the natural gas demand that could be met by digesting the refuse from the community.
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An industry wants to locate a chemical plant in your city, they expect to
generate 25,000 gal/hr of waste containing 800 mg/L of BOD wastes (reactive) and
15,000 mg/L of inert (non-reactive) materials. The industry wants to recycle 300
gal/min (containing 20 mg/L BOD and 400 mg/L of salts) of discharge (effluent) from
the municipal wastewater treatment plant to dilute their waste to 6,000 mg/L of
inerts prior to pre-treating the wastes on their own property.
If the rate constant for the first order degradation of BOD5 to be 0.75/hr, how big
must the reactor be to treat the BOD entering the reactor to 200 mg/L?
A city has a population of 50000 people and they consume an
average 20 million m3 of natural gas per year. What fraction of this
demand could be met by digesting the refuse from this community.
Assume solid waste generation rate is 2kg/person/day, Organics
are in the form of glucose whose organic proportion is 54.40 %.
Equal amounts of two types of waste are disposed into a section of a landfill. They both start
producing gas at t=0. Assume first-order decay for gas production. Each type of waste can
produce 150 L CH4/kg of waste. Waste type A produces gas with a half-life of 8 years, and
waste type B produces gas with a half-life of 4 years. How long (to the nearest year) until 90%
of the total gas has been produced?
a.
0.8 years
b. 6.4 years
c. 7 years
d. 27.6 years
e. 20.4 years
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- A city receives 42 tons per day of a solid waste stream with chemical formula C4H17O to their waste to energy facility each day. Estimate the air requirements to combust this waste in cubic ft per day. Assume specific weight of air is 0.075 lb/cu ft and that air is 21% oxygen by weight.arrow_forwardHow much hydrochloric acid (kg/d) is required to neutralize a waste with 20 mg/L NAOH and a flowrate of 220 L/min?arrow_forward3.5 If an industrial plant discharges an effluent with a solids concentration at a rate of 5000 lb/day, and if each person contributes 0.2 lb./day, what is the population equivalent of the waste?arrow_forward
- If an industrial plant discharges an effluent with a solids concentrationat a rate of 5000 lb/day, and if each person contributes 0.2 lb/day, what isthe population equivalent of the waste?arrow_forwardA city generates waste at a rate of 7400,000 kg/day. The density of the compacted waste is 380 kg/m3. How large should they build a landfill to contain a decade's worth of waste if the ratio of cover to compacted fill will be 1.5? Give your answer in m3arrow_forwardQ: Assume a rough estimate of MSW composition is as follows: % by weight Moisture content (%) Paper (assume dry mass all cellulose, C6H10O5) 40 8% Glass 10 - Steel 10 - Aluminum 10 - Food waste (assume dry mass all sugar, C6H12O6) 30 80% a) If 20,000 metric tonnes of this waste is for anaerobic digestion, how much methane gas would theoretically be produced? b) If 20,000 metric tonnes of this waste is for aerobic composting. How much oxygen would theoretically be demanded?arrow_forward
- Q1/ In a city, the population to be served 78320 and per capital waste generation is o.85 kg/capita/day in addition to 0.96 Kg/capita/day is generating from temporary residences camp including 100 capita, around of four private houses each one comprise 13 residences and per capital waste generation is 1.1Kg/capita /day. Calculate the quantity of waste produced in tons during 6 months (month is 30 days).arrow_forwardIn a city, the population to be served: 78,320 and per capita waste generation is 0.85 kg/capita/day in addition to 0.96 kg/capita/day is generating from two temporary residences camp including 100 capita, around of four private houses each one comprise 13 residences and per capita waste generation is 1.1 kg/capita/day. Calculate the quantity of waste produced in tons during 6 months (month is 30 days)arrow_forward75 g of CO2 and 40 g of CH4 are produced from the decomposition of municipal solid waste (MSW) with a formula weight of 150 g. What is the average per capita green house gas production (in g/day) in a city of 2 million people with a MSW production rate of 760 ton/day?arrow_forward
- Question 1 Municipal solid waste is generated within a community from several sources, not just the List and discuss these sources. In the town of Abesim, it is determined that the per capita waste generation rate is 1.4 kg(3.1 lb) per person per day. The collection is conducted once per week by the municipality. If the density of MSW in a typical trash container is 150 kg/m3, how many 120 L (30 gal) containers would be needed for a family of four? From (b), collection trucks have a capacity of 11.5 m3(15 yd3), which can compactthe waste to a density of 420 kg/m3. How many customers can a truck handle in a single run, before departing for the transfer station? In your community, is waste collection carried out by the municipality or by a privatehauler? Who collects the commercial wastes?arrow_forwardAnaerobic digestor was designed to process municipal solid waste having the chemical formula of C4H3O4. How much methane gas will be produced if 6520 lb of this waste was placed in the digester?arrow_forwardCalculate the annual volume of solid waste produced assuming the volume rate of generation of 1 kg per capita per day by a six workers. Given that the density of waste is 480 kg per cu. meter in a company?arrow_forward
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