What is the sludge volume index, Civil Engineering

Assignment Help:

What is the Sludge Volume Index?

Two 1 L samples of mixed liquor are taken from a lagoon. After settling for 30 min in a graduated cylinder, 250 mL of solids have settled out in the first sample. The total suspended solids concentration (MLSS) in the second sample is found to be 2300 mg/L.

(a) What is the sludge volume index?

(b) What is the theoretical required sludge recycle rate?  

Ans:

(a) From eq for SVI, SVI = 1000Vsettled, mL/L/ Xmg/L

= (1000mg/g)(250ml/L)/2300mg/L = 109mL/g

(b) From Eq for, R = Vsettled, mL/L/ 1000-Vsettled, mL/L

250mL / 1000mL - 250mL = 0.33


Related Discussions:- What is the sludge volume index

Railway bridge, how to measure the waterways of railway bridges

how to measure the waterways of railway bridges

Retaioning walls, what are the uses of retaining wall?!

what are the uses of retaining wall?!

Highway and traffic, am currently doing my masters degree in highway,pleas...

am currently doing my masters degree in highway,please suggest for me topics i will research on

Fore bearing, find out the interior angleS with diagrame LINE AB, BC, CD, D...

find out the interior angleS with diagrame LINE AB, BC, CD, DE, EA Fore bearing 60''30" , 122'' , 46'' , 205''30" , 300''

Lead products in construction, What are the advantages and disadvantages of...

What are the advantages and disadvantages of lead products in construction? Ans) Disadvantages: -Lead is very toxic; its use can result in pollution of the ground and more signi

Distomat, write the brief description about distomat

write the brief description about distomat

Determine the loss in post-tensioned members, Determine the Loss in post-te...

Determine the Loss in post-tensioned members This loss occurs only in post-tensioned members. There always exists a certain amount of friction in the jacking and anchoring syst

Solid block -calculating for design mix, Good evening sir, solid block''s d...

Good evening sir, solid block''s design mix calculated generally please explain and derive .

.levelling, differentiate between Dumpy level:The Wye or Y level:Cooke''s r...

differentiate between Dumpy level:The Wye or Y level:Cooke''s reversible level: Cushing''s level:Tilting level and Automatic level

Retaining walls, Retaining Walls: Needed to retain the fill portion, a...

Retaining Walls: Needed to retain the fill portion, and generally constructed in dry stone masonry with pucca bunds (Figure). Figure: Typical Design for a Retaining

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd