Interested to Buy Any Domain ? << Click Here >> for more details...
Question 68 – Biochemical Oxygen Demand (BOD) could be calculated using the formula BOD = (DOi - DOf) (Vb / Vs)
where Vb = Volume of bottle in ml,
Vs = Volume of sample in ml,
DOi = Initial dissolved oxygen in mg / L,
DOf = Final dissolved oxygen in mg / L.
(a) By using a bottle of Vb = 300 ml with sample Vs = 30 ml, find the BOD if DOi = 8.8 mg / L and DOf = 5.9 mg / L.
(b) By using a bottle Vb = 600 mL with sample Vs = 100 mL, find the BOD if DOi = 8.8 mg / L and DOf = 4.2 mg / L.
(c) Find the average BOD = [ Answer of (a) Answer of (b) ] / 2.
(d) If the BOD-5 test for (a) - (c) is run on a secondary effluent using a nitrification inhibitor, find the nitrogenous BOD (NBOD) = TBOD - CBOD. Let TBOD = 45 mg / L and CBOD = Answer of (c).
- 1 Answers
- 3247 Views
- I also Faced
- E-Mail Answers
Answer Posted / kang chuen tat (malaysia - pen
Answer 68 – (a) BOD = (8.8 - 5.9) (300 / 30) = 29 mg / L.
(b) BOD = (8.8 - 4.2) (600 / 100) = 27.6 mg / L.
(c) BOD = (29 27.6) / 2 = 28.3 mg / L.
(d) NBOD = 45 - 28.3 = 16.7 mg / L.
The answer is given by Kang Chuen Tat; PO Box 6263, Dandenong, Victoria VIC 3175, Australia; SMS 61405421706; chuentat@hotmail.com; http://kangchuentat.wordpress.com.
| Is This Answer Correct ? | 0 Yes | 0 No |
Post New Answer View All Answers
What is the largest application for surfactants?
How i can calculate heat transfer in reactor at unsteady state and what data should i have? I want equation and process to calculate it? As there is steam or brine in jacket
How do you design a vapor-liquid separator or a flash drum?
what is designing step of heat exchanger
What are the Major Utility Systems in a Pharma Plant? How are they interrelated?
What does the catalytic converter on an automobile really do?
Specific Heat of Bagasse at 50% moisture, 40% moisture and 25% moisture?
What is load?
Do you have any idea on recombinant protein expression?
Explain under what circumstances are vortex flowmeters the most accurate?
MY generator water cooler inlet line height - 11 mtr inlet water line height - 7 mtr water come into the line from overhead tank, O/H tank height - 20 mtr the first tapping in the inlet line is 2" line which down to 4 mtr level plateform., second tapping in inlet water line goes to a pump 6" line installed at 4 mtr level plateform, pump capacity 200m3/hr, head- 30 mtr, hp-40. the outlet of pump of 6" water line connected to a header of 6 mtr long of 6" line, on this header the six tapping are connected, 4 nos. 3" line goes to 11 mtr height water cooler the pressure of the line is 0.15 to 0.25 kg/cm2, 2" and 4" pipe line connected to a cooler at 4 mtrlevel plateform. my question is, at 11 mtr height level the quantity of water and flow is not sufficient for my cooler, the temp. of cooler is rises much more. you are requested to suggest the modification of pipe line/ pump for take more water flow and pressure (desired pressure is 1 kg/cm2)
What is a good method of minimizing shell side pressure drop in a shell and tube exchanger?
Do you have recombinant protein expression experience? Explain?
What is the ignition temp. of Alluminium,Coper&Iron.
Explain how can you quickly estimate the horsepower of a pump?
