
Concept explainers
(a)
To compare and evaluate : The percentage and total generation to national averages and report on the solid waste generated.

Explanation of Solution
The statement that includes a comparison of the total generation and percentage compared to the national averages is as below.
The national average of the waste above the percentage of the waste refuse produced by a single person in the house is
The weights of solid waste are classified below.
Weight |
Per cent of the total weight | |
Paper | ||
Plastics | ||
Aluminium | ||
Steel | ||
Glass | |
|
Food | ||
Other | ||
Total | |
About
(b)
The amount of waste that is reusable and to identify the amount of waste that might be reduced.

Explanation of Solution
Glass waste can be reused in various ways such as mixing the glass powder with concrete for the replacement of sand. Since the demand for sand is more, glass powder can be used as a partial replacement for sand. Plastic bags can be used as plastic bottles; supply cups can be used for keeping pens, pencil and the plastic watering cans can be used as pots for gardening.
(c)
The various items in the refuse that is recoverable and to identify the process that is carried out.

Explanation of Solution
Recovery is defined as process by which the refuse can be converted into new products. Recovery of the materials such as waste plastic bottles can be converted to new plastic bottles, steel cans are converted to new steel cans, steel beams or recycled bicycles.
Want to see more full solutions like this?
Chapter 1 Solutions
Solid Waste Engineering
- Problems 5-1 Stead flow of steam enters a condenser with an enthalpy of 2400 kJ/kg and a velocity of 366 m/sec. the condensate leaves the condenser with an enthalpy of 162kJ/sec and a velocity of 6 m/sec what is the heat transferred to the cooling water per kg steam condensed. (-69198 kJ/kg) 5-2 An air compressor delivers 4.5 kg of air per minute at a pressure of 7 bar and a specific volume of 0.17 m³ /kg. Ambient conditions are pressure 1bar and specific volume 0.86 m³/kg. The initial and final internal energy values for the air are 28 kJ/kg and 110 kJ/kg respectively. Heat rejected to the cooling jacket is 76kJ/kg of air pumped. Neglecting changes in kinetic and potential energies, what is the shaft power required driving the compressor? (14.3kW)arrow_forwardDetermine the design resistance to transverse force F,Rdarrow_forwardAs a structural engineer, your task is to design an optimum section that has sufficient resistance to the applied loading for the primary beam proposed in Figure 1. A UB in grade S275 steel is required for the unrestraint beam to carry the ultimate loads over the given span. Choose an optimumUB section and justify your selection. You are required to submit a design analysis by considering bending, shear, transverse force, and deflection checking for the selected member based on Eurocode 3 and the assumption of support condition and loading must be clearly stated. P=15 kN. a 2 m. b=3m ·L· ·b. Figure 1 Simply supported steel beamarrow_forward
- Why is it important to establish logical relationships between tasks when developing a construction schedule?arrow_forwardFor the gravity concrete dam shown in the figure, the following data are available: - Unit weight of concrete (Yeone) = 2.4 ton/m³ Neglect( Wave pressure, silt pressure, ice force and earth quake force) -0.65, (Ywater) 1 ton/m³ Find factor of safety against sliding and overturning (F.Said & F.Sover), If heel and toe stresses (Pais & Pmas) are 57.17ton/m2 and 84.53 ton/m² respectively. w.s.l 83m 10m 80m 8m Solve on paper step by step with sketcharrow_forwardWhy is proper planning important when developing a baseline construction project schedule?arrow_forward
- Determine the minimum possible surface area of a secondary clarifier treating activated sludge with a design influent flow rate (Q) of 1,000 m³/d, a return activated sludge (RAS) recycling ratio of 25%, and a mixed liquor total suspended solids (MLSS) concentration of 4,000 mg/L, if the overflow rate must be less than 33 m/d and the solids loading rate must be less than 250 kg/m²/d. Express your answer in m² and round up to the next integer.arrow_forwardEstimate the required air flow rate for the new activated sludge plant at Pea Ridge (Problems 23-223-723-10, and 23-13). The flow rate is 8,450 m³/day, the concentration of bCOD going into the system (So) is 137 mg/L, the concentration of bCOD leaving the system (S) is 16.3 mg/L, and the mass of cells produced per day (Pxvss) is 277.4 kg/d. Use the following assumptions to estimate the required air flow rate: . Clean water correction, a = 0.50 . Salinity correction, B = 0.95 Fouling factor = 0.9 Wastewater temperature = 12°C Atmospheric pressure = 101.325 kPa .Elevation 500 m . Depth of aerator = 5.6 m Operating DO 2.0 mg/L Percent oxygen leaving aeration tank - 19% ■ Manufacturer's SOTR = 535 kg/d Manufacturer's air flow rate at standard conditions 50 m³/d - aerator Express your answer with the units of m³/d and round to the nearest integer.arrow_forwardDetermine the required solids retention time (SRT) of a completely mixed activated sludge aeration tank for a conventional activated sludge system treating a design flow rate of 34,560 m³/d, where the effluent standards are 30.0 mg/L for BODs and 30.0 mg/L for total suspended solids (TSS). Assume that the BOD5 of the effluent TSS is 70% of the TSS concentration. Assume the BODs concentration leaving the primary clarifier is 128 mg/L that the MLVSS concentration (X₂) is 2,500 mg/L. Assume the following values for the growth constants: Ks 100 mg/L BODS ⚫ Hm - 2.5 d 1 kd = 0.050 d 1 Y = 0.50 mg VSS/mg BODs removed Express your answer in days and round to the nearest 0.1.arrow_forward
- Q1: Figure below shows loaded beam with its cross-section area, (A) Draw shear force and bending moment diagrams, stating the main values, (B) Find central slope and deflection, (C) Sketch the distribution of shear stress at left support, (D) Find maximum tensile and compressive bending stresses set up in beam at right support. E-205GN/m² P1 P2 P3 W1 W2 Lin Lin # A Length in (m) and loads in kN 3a a 2a 2a (Cross-section area, All dimensions in (mm))arrow_forwardEstimate the mass of oxygen to be supplied for a new activated sludge plant at Pea Ridge to treat a flow rate of 8,450 m³/day. Assume that the concentration of bCOD going into the system (So) is 137 mg/L, that the bCOD leaving the system (S) is 16.3 mg/L, and that the mass of cells produced per day (Pxvss) is 277.4 kg/d. Express your answer in kg/day and round to the nearest integer.arrow_forward*10-4. Determine the internal moments at the supports A, B, and C, then draw the moment diagram. Assume A is pinned, and B and C are rollers. El is constant. 3 k/ft 8 ft- 8 ft -4 ft-arrow_forward
- Solid Waste EngineeringCivil EngineeringISBN:9781305635203Author:Worrell, William A.Publisher:Cengage Learning,Engineering Fundamentals: An Introduction to Engi...Civil EngineeringISBN:9781305084766Author:Saeed MoaveniPublisher:Cengage LearningConstruction Materials, Methods and Techniques (M...Civil EngineeringISBN:9781305086272Author:William P. Spence, Eva KultermannPublisher:Cengage Learning
- Residential Construction Academy: House Wiring (M...Civil EngineeringISBN:9781285852225Author:Gregory W FletcherPublisher:Cengage LearningMaterials Science And Engineering PropertiesCivil EngineeringISBN:9781111988609Author:Charles GilmorePublisher:Cengage Learning





