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

Types of cross-drainge structures, Types of Cross-drainage Structures: ...

Types of Cross-drainage Structures: The following are the types of cross-drainage structures : (a) Culverts, having waterway upto 6 m. (b) Minor Bridges, having waterwa

Compression members, Compression Members: Compression members in steel...

Compression Members: Compression members in steel need special care in design. Steel possesses high strength in tension/compression; hence the sections are generally small com

Deterioration in steel, How abrasion and earthquake causes deterioration in...

How abrasion and earthquake causes deterioration in steel structures

Explain resultant force on a given area of an inclined plane, Resultant For...

Resultant Force on a Given Area of an Inclined Plane The resultant force is calculated from the average pressure:    R = (AVERAGE P)(A)

Advantages of continuous multiple-span deck, Q. Advantages of continuous mu...

Q. Advantages of continuous multiple-span deck over simply supported multiple-span deck? Movement joints are generally added to bridge structures to accommodate movements bec

Shoes of prefabricated drains, Q. Shoes of prefabricated drains? Shoes ...

Q. Shoes of prefabricated drains? Shoes are generally installed in prefabricated drains for the below : (i)  It avoids the entry of soils in the mandrel by sealing it at the

Shape and soundness test - testing of aggregates, Shape and Soundness Test ...

Shape and Soundness Test - Testing of aggregates: Shape For providing a good interlock and strength, the aggregates should be cubical in shape. Elongated and flaky pa

Explain the shrinkage strain of concrete, Explain the shrinkage strain of c...

Explain the shrinkage strain of concrete Shrinkage of concrete depends only on the interval of time and the moisture conditions, but is independent of the stresses in the membe

Surveying, sample problems with solutions for probable value

sample problems with solutions for probable value

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