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

Can you determine the quantity of apron stone, Q. Can you determine the Qua...

Q. Can you determine the Quantity of apron stone? Quantity should be sufficient to cover the scoured face down to maximum depth of scour obtained using scour factor c of 2.5 at

Seive analysis, what is sieve analysis? expalin its procedure.

what is sieve analysis? expalin its procedure.

Prestressed concrete structures, Distinguish between uniaxial biaxial and t...

Distinguish between uniaxial biaxial and triaxial prestressing

Surveying, working from whole to part

working from whole to part

Surveying, what are tie lines? explain in detail

what are tie lines? explain in detail

Assignment, How to do assignment on the basis of azetropic mixture

How to do assignment on the basis of azetropic mixture

Explain the mechanism of compaction by paver, Q. Explain the Mechanism of c...

Q. Explain the Mechanism of compaction by paver? Mechanism of compaction by paver, steel-wheeled roller and pneumatic tire rollers Paver, steel-wheeled roller and pneumat

What do you mean by guide bunds, Q. What do you mean by Guide bunds? Gu...

Q. What do you mean by Guide bunds? Guide bund may be given an elliptical shape separation of flow can be avoided better with such an alignment. Alternatively straight parallel

Estimate the minimum electric power, The sketch shows a common consumer pro...

The sketch shows a common consumer product called Water Pik. This device uses a motor to drive a piston pump that produces a jet of water (diameter d = 3 mm, temperature T = 10 °C)

Disparity between fasteners, Question What is major disparity between ...

Question What is major disparity between fasteners , bolts and screws ? Answer Fastener is a broad term to explain something that is used as a restraint for holding

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