The activated sludge unit of a wastewater treatment plant requires an aerator. Two options exist and have the characteristics shown in the table. The city owner of the treatment plant sets an interest rate of 9%. Analysis period is 10 years. Determine which aerator to purchase. Initial cost Annual operating cost Annual Benefit Lifetime (years) Question 1: Incremental benefit-cost ratio analysis Aerator 1 462000 answer 55000 150000 10 APWC, APWB, Choose 1 or 2 (0 for none or 3 for both)? = percision guide: [0.000, 0.000, integer] [[ ]] • ? Aerator 2 207000 23000 100000 5

The size of ahorizontal branch waste pipe for one lavatory, one residential sink and oneslop sink.

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The effluent license, pollution license, noise permit, waste license are currently implemented by the National Environment Secretariat (NES) 1. True  2. False

A company plans to construct a wastewater treatment plant to treat and dispose of its wastewater. Construction of a wastewater treatment plant is expected to cost $2 million and an operating cost of $300,000/yr. Determine the NPV of the total cost (including the capital investment and total operating expenses) over the period of 30 years at an interest rate of 6.5% for treating the wastewater

Caselet 2: You are an environmental engineer for one of the many local plants. That plant discharges effluents into a lake in a flourishing tourist area. Although all the plants are marginally profitable, they compete for the same customers. Your responsibilities are to monitor the water and air discharges at your plant and the periodic reporting to Dept. of Anti-pollution. You have just prepared a report that indicates that the level of pollution in the Plant’s water discharges slightly exceed the legal limits. Your supervisor says you should regard the excess as a mere ‘technicality’, and he asks you to ‘adjust’ the data so that the data appears to be in compliance. He says that slight excess is not going to endanger human or fish life any more than if the plant were actually in compliance. However he says, solving the problem would require a very heavy investment. He explains, “We can not afford new equipment. It might cost even a few jobs. It will set us behind our competitors.…

Outline possible measures that can be taken if the factories are realising untreated industrial effluents into a nearby river

A company uses a 50% solution of NaOH to maintain the pH of water circulated in one of its furnace exhaust scrubbers. The cost of the solution is $200 per ton f.o.h. (free-on-board), The supplier says it would prefer to sell the company a 65% NaOH solution and the company says the water content is immaterial ap long as the equivalent costs are the same including freight If the freight is $15 per ton, what is the maximum price per ton the company should pay for the 65% solution?

5) Millard Manufacturing must replace one of its pumps. The net present cost of Alternative A is $8,956, Alternative B is $5,531, and Alternative C is $4,078. Alternative A is expected to last for 12 years; Alternative B has a life expectancy of 7 years; and Alternative C is expected to last for 5 years. If Millard's MARR is 5%, which alternative (if any) should be chosen using EUAC (Equivalent Uniform Annual Cost)?

illustrate five major unit operaiotns used in wastewater treatment and also highlight the importnce of these operations