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
- 3372 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
dear sir/madam, I had applied for the post of officer trainee so plz if u have any papers both technical or aptitude plz inform me on sonalichavan01@gmail.com
which materials can l use if l want to use length wave 680 to 900 in hplc
friends....i have been searching the model paper for HPCL officer trainee for chemical eng....tat apptitude section...if u people got any information regarding tat...please send me to my mail...my id is: maruthu.flower@gmail.com...pls send me wtever information u knew....thank u....
sir,please give me some exam paper for referance. Thanks & Regards,
PLEASE ANY ONE READ THIS MESSAGE ANSWER ME AT MY EMAIL ID surendrasaroj18@gmail.com sir i am prepairing for section engineer exam taken by railway my branch is chemical engineering i want previous paper of chemical engineering of section engineer exam taken by railway. please answer me as soon as possible thankyou
hai please please if any one have useful test related and interview based question plz send me at saify_0@hotmail.com i will be thankfull
hello sir..iam keen to sit for iocl interview..please forward sample iocl questions to my id: kunal_kv06@yahoo.co.in
In which state sulphur exists at 40 degrees temperature and 40 atmospheric pressure in natural gas having sulphur composition 0.1 ppm?
send previousyear question paper for ongc gt 2011 chemical engineering written exam
i am a prefinal year student of polymer engineering .could you please send the latest question papers regarding entrace exam.
I want previous year question paper of ONGC for chemical engg.
Do you have recombinant protein expression experience? Explain?
hai can anyone send me soft copy of o.p gupta or tell me downloading link please please at saify_0@hotmail.com
i need last year question paper of GATE exam of chemical stream.but i failed i geting exam papers.soits humble request to u that if any body found last years GATE exam paper of chemical stream then send it to on this mail address.i shall be thankful to u for this. mail address:- sachin_4255@yahoo.co.in thank you.
Plz if anybody has placement paper of HAL mail me i m Chemical engg my id er.kotnala@gmail.com
