Reference no: EM131377189
Question
The town of Prettybrooks (population 65,000) is to build a new sewage treatment works. The Environment Agency requires an environmental impact assessment to be carried out for the project. The water quality targets to be met in the receiving watercourse, 18km downstream of the proposed sewage outfall are set as follows:
(i) Dissolved oxygen (DO) not less than 6 mg/I, when the flow of the receiving water course, the river Little Lousy, upstream of the proposed plant is 12 m'/s.
(ii) BODs less than 6 mg/I within 0.5 days
Water consumption in Prettybrooks is 250 litre / head / day on average and the estimated water losses of the system in the summer months (evaporation, gardening losses, leakage of the sewer system, etc) are 2096. Estimated raw sewage strength BODs is 550 mg O2/l.
Estimated raw sewage DO concentration is 1.5 mg/l. Assume a de-oxygenation rate constant, K1 of 0.37 day-1 at 20°C (to base e).
The Environment Agency has supplied the following background data for the river Little Lousy upstream of the proposed discharge point:
- BODs concentration: 6 mg/l
- DO: 7 mg O2/l
- River velocity = 0.4 m/s
- Mean depth of stream: 1.3 m
- The mean river temperature is 19 °C
Calculate:
(i) if raw sewage is discharged with no treatment, the critical time corresponding to the critical deficit, and the distance downstream of the discharge point at which it occurs.
(ii) the critical DO deficit
(iii) The time and distance for which the BOD criteria are violated if raw sewage is discharged with no treatment.
(iv) The amount of BOD to be removed at the proposed 51W in order that the EA requirements are met.
(v) The revised critical time and deficit associated with item (iv).
|
Rate of economic growth rate and rate of growth of real GDP
: How could South Koreas long run rate growth of real GDP per capita shrink to or below zero if it's long term rate of total real GDP growth were to drop to nearly zero? (Hint: what is the difference between the rate of the economic growth rate and the..
|
|
Typically used to close recessionary gap
: What fiscal policy (or policies) is/are typically used to close a recessionary gap? Draw the Aggregate Demand and Supply model showing the changes in Price levels and Real GDP-make sure your illustration clearly shows the recessionary gap.
|
|
Has 599 health services administration capstone
: The Case for Open Heart Surgery at Cabarrus Memorial Hospital, Discuss ways the program does or does not comply with the hospital's mission.
|
|
Create a summary of the reading
: Create a summary of the reading, also, develop two critical questions rising from the reading along with two ideas/concepts that you have found enlightening or thought provoking.
|
|
Calculate the critical do deficit
: Calculate if raw sewage is discharged with no treatment, the critical time corresponding to the critical deficit, and the distance downstream of the discharge point at which it occurs.
|
|
Discuss about the post given below
: You will write a paper of at least 1,200 words comparing and contrasting the theoretical perspectives of human development and classroom management presented by the theorists Abraham Maslow, Rudolf Dreikurs, William Glasser and Stanley Coppersmith..
|
|
Discuss the issues in health information technology advances
: Discuss the issues in health information technology advances that will impact Healing Hands Hospital in the future with possible consolidation/expansion and the impact on quality of care.
|
|
Query design and result set in a word document
: Using the Woodcraft database file, create some queries that use concepts found in the textbook, as well as this week's iLab. Post a screenshot of your query design and result set in a Word document.
|
|
Create 3 open-ended questions about your text
: Create 3 open-ended questions about your text. Remember, an open-ended questions gets people talking. It cannot be answered with "yes", "no" or single word answers. You do not need to know the answer! Write down something you're wondering abo..
|