Solid Waste Engineering
3rd Edition
ISBN: 9781305635203
Author: Worrell, William A.
Publisher: Cengage Learning,
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Chapter 1, Problem 1.3P
To determine
If plastic bags are harmful.
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They both have their advocates and detractors. On one of the flyers (printedon paper) they said:Plastic bag does not emit toxic fumes when properly incinerated. When burned in waste-to energy plants, the resulting by-products from combustion are carbon dioxide and water vapor. The bag is inert in landfills, when it does not contribute to leaching, bacterial or explosive gas problems. The bag photo-degrades in sunlight to the point that normal environmental factors of wind and rain will cause it to break into very small pieces. Thereby addressing the unsightly litter problemQ: Is all of it true? Is anything misleading?Do you agree with their evaluation?Write one-page response.
plastic bags at food stores have become ubiquitous. Often recycling advocates point to the plastic bags as prototype of wastage and pollution, as stuff that clogs up our landfills. In retaliation, plastic bag manufacturers have begun a public relations campaign to promote their product.
Landfills have historically been sources of all but ONE of the following: a. breeding grounds for insects and rodents b. producers of propane gas C. pollution to groundwater d. odor
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Solid Waste Engineering
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- What are the human health effects of nitrogen oxides?arrow_forwardUsing the energy content (wet basis) of the waste components given in the table below, calculate the overall energy content of the waste having the composition shown. You can assume 100 lb of waste to make this easier. Then determine the composition of the left-over waste if 80 % of the cardboard, 60% of the yard waste, 50% of the paper, 30 % of the metals and 20% of the plastics are recovered or recycled. How does this affect the total energy content of the discarded waste? How about the energy content per mass (wet weight)?arrow_forwardWhat types of materials are available for recycling or reusing locally or near in our places? Explain in 3 paragraphs.arrow_forward
- 11. What is pyrolysis and how is it used to treat hazardous waste materials?arrow_forwardCan 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_forwardConsider the meaning and purpose of the various recycling symbols shown in Figure 1.15. a. Which are used solely as marketing tools, and which tell you what you want to know if your intent is to buy recycled materials? b. Find and cut out a recycling symbol from some product and attach it to your homework paper. Discuss its purpose and integrity.arrow_forward
- Draw a complete process flow diagram for a conventional filtration drinking water treatment plant, labeling each component and indicating its purpose (what it is designed to remove or how it affects removal in subsequent processes). Disinfection by-products: why are they a problem, how are they formed, and how does a conventional filtration plant minimize their formation? The purpose of coagulation and flocculation is to prepare colloidal particles for removal from water or wastewater by a downstream process of settling and/or filtration. The coagulants that are commonly used have two different functions that you should explain. Explain how (the dreaded chemistry) the addition of alum decreases alkalinity and tends to lower the pH of the treated water. (you may want to have a separate slide or graphic to help you explain this). Make sure to discuss how the mixing systems differ between the coagulation (rapid mix) and flocculation (slow mix) steps in the process. Talk about the…arrow_forwardChoose the correct answer Which of the following wastes is the most recycled in the United States? A.Car batteries; B.Paper; C. Soda cans; D. Yard wastes Which is the primary disposal method for municipal solid waste in the United States? A. incineration; B. recycling; C. landfill; D. none of the above What is (are) the major environmental concern(s) during landfilling?A.gas production. B. leachate generation. C. A and B. D. neither of A or B. The gases produced from landfills are encouraged to be used as a new energy. Which of the following in the landfill gases is (are) the effective ingredient as an energy source? A. carbon dioxide and methane; B. carbon monoxide and methane C.methane; D. carbon dioxidearrow_forwardRecall 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_forward
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