Sustainable Energy
2nd Edition
ISBN: 9781337551663
Author: DUNLAP, Richard A.
Publisher: Cengage,
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Question
Chapter 4, Problem 6P
(a)
To determine
Determine the mass of
(b)
To determine
Analyze the burning of methane instead of decomposition has positive or negative environmental effects.
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Students have asked these similar questions
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
Check
Problem 6-6 (assume the waste is fed to an anaerobic digester, not landfilled). Use the equation given attached. Find x (moles of CH4) for food and paper as well. Then based moles of methane (x), individually calculate methane generated for paper and food waste and then total it. Provide answers in tons.
Q: 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?
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- Can I get a thorough step by step for the following question? The US EPA requires hazardous waste incinerators to meet a standard of 99.99% destruction and removal of organic hazardous constituents injected into the incinerator, which is referred to as "four nines DRE". The efficiency is calculated by measuring the mass flow rate of organic constituents entering the incinerator and the mass flow rate of constituents exiting the incinerator stack, as shown in Figure 1. Draw a mass-balance diagram and determine the allowable quantity of contaminant in the exit stream if the incinerator is burning 1.2000 g/s of hazardous constituents. If the incinerator is 96% efficient in destroying the hazardous constituents, what scrubber efficiency is necessary to meet the EPA standard?arrow_forwardThe level of nuclear waste that must be put in put in drums and surrounded by concrete, and put into clay lined landfill sites. a. low level b. none of these c. high level d. intermediate levelarrow_forwardA county generates 1 million ton of municipal solid waste after recycling every year. The town is considering whether the waste is landfilled or incinerated. For disposal of the waste generated in one year, which option is better to produce less volume of greenhouse gases (GHGs)? Which option is better to have less greenhouse effect? We assume that the waste has a chemical formula of C68H111O50 Decomposition of solid waste in incineration is shown in the following reaction. CaHbOcNd+4a+b+2d-c2O2=aCO2↑+b2H2O+dNO↑ 2) water produced from the reaction(s) is not GHG because it is liquid water).arrow_forward
- The landfill volume required for dry solid waste generated by a food factory per year is 400 m3. After drying the wet solid waste from the factory X% of it is recycled, followed by 2.5% diversion for composting and 500 m3 for incineration, before the remainder is sent to the landfill. Using the information given below: Density of dry solid waste = 425 kg/m3 Daily generation of wet solid waste = 1500 kg Moisture content of the wet solid waste = 38% Determine X% and estimate the dimensions of the landfill site if the length:width:depth = 5:4:7. QUESTION 2. Estimate the theoretical amount of slow decomposable solid waste (C20H29O9N) required to produce 65 m3of methane (CH4) using the equation below. Assume a 75% conversion and the density of methane is 0.7167 kg/m3. Use the equation below C20 H 29 O9 N + 9H20 = 11CH4 + 9H20 + NH3 C = 12, N = 14, H =1, O = 16 QUESTION 3. Briefly discuss factors that influence…arrow_forwardChoose the correct answer 200 g CO2 approximately takes up ____ L volume in air at 1 atm and 0oC? 4480; 100; C. 200; D. Undetermined Which of the following gases has the greatest contribution to the greenhouse effect on the Earth? A. Water vapor; B. CO2; C. CH4; D. O3 Based on what you have learned, which of the following can contribute(s) greenhouse gases? A. landfills; B. a deep lake with organic rich sediments; C. septic tanks; D. all of the above Which of the following gases is NOT a greenhouse gas? A. methane; B. carbon monoxide; C. hydrofluorocarbons; D. water vaporarrow_forwardAn 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?arrow_forward
- Recall that the Tatooine community has a population of 600663 residents and generate 0.7 kg of solid waste per day per person. Using the waste fraction data from before, estimate the total waste available annually for recycling if metal and glass will be recycled: Waste fraction Food waste Paper Plastic Yard waste Percent (%) 41.1 19.8 13.9 8.4 The remainder of the waste consists of metal, glass, inert material and rubber and inert material and rubber together account for 54.8% of the remainder waste. Answer: x Okg Ometric tons You did not give the correct unit. The correct answer is: 1.17e7 kg Finish reviewarrow_forward2. The maximum amount of solid waste collected per day for one week is presented below. All the solid waste are to be burned at a municipal waste to energy combustion facility at a constant rate of 100 tons/day. What is the required capacity of the storage pit that should be designed to accommodate twice the required daily capacity Day Solid waste collected (tons/day) Monday 150 Tuesday 130 Wednesday 120 Thursday 120 Friday 100 Saturday 80 Sunday 0arrow_forwardA landfill initially received 10,000 tons/day of waste. This receipt rate increases 10% per year. The landfill is closed at the end of the fourth year. Calculate the yearly gas production for 20 years after opening. What is the peak gas production in m3/yr.arrow_forward
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