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

Epoxy-coated bars vs galvanized bars, Bonding performance to concrete: Epox...

Bonding performance to concrete: Epoxy-coated bars vs. galvanized bars  Based on the findings of CEB Bulletin 211 the bonding of galvanized bars to concrete is lower in early

Paints., contituents of paints

contituents of paints

Acid test - tests on stones, Acid Test: This test is usually carried...

Acid Test: This test is usually carried out on sand stones to examine the presence of calcium carbonate that weakens the weather resisting quality. In this particular  test,

Reciprocal ranging, what do you mean by reciprocal ranging explain with a n...

what do you mean by reciprocal ranging explain with a neat sketch

Mr Kamal Saxena, What is WBM road. How it is constructed?

What is WBM road. How it is constructed?

Equllibrium, how to know about he sign convention for equllibrium forces

how to know about he sign convention for equllibrium forces

Conics, what is the eccentricity of ellipse

what is the eccentricity of ellipse

Why we need a high strength concrete in prestressing, Why we need a high st...

Why we need a high strength concrete in prestressing There is another aspect to why we need a high strength concrete in prestressing. Prestressed concrete is subjected to high

Foundation, difference between piles and pier

difference between piles and pier

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