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

Zeroth law of thermodynamics, Two systems which are equal in temperature to...

Two systems which are equal in temperature to a third system are equal in temperature to each other

Plumbing technology, This assessment will test Learning Outcomes 3 and 4 as...

This assessment will test Learning Outcomes 3 and 4 as well as the component of Learning Outcome 1 as it refers to waste disposal for the Plumbing Technology. The student is expect

Roads, how to calculate number of passes while compaction

how to calculate number of passes while compaction

What is the force exerted by the tacoma narrows bridge, The force exerted t...

The force exerted to the Tacoma narrows bridge was initially the wind resistance. The wind resistance cause the entire bridge to act as a system with forced vibration with damping.

Mechanics of solids assignment, What will be the cost of Mechanics of solid...

What will be the cost of Mechanics of solids assignment consisting of 150 questions of 6 marks

Track structure on broad gauge, Q. What is the minimum prescribed track str...

Q. What is the minimum prescribed track structure for LWR / CWR on Broad Gauge? Ans.- 1. General - The minimum length of LWR depends upon - i. Range of temporary variati

Arches, construction of arches

construction of arches

Determine concentration of total solids and volatile solids, The following ...

The following test results were obtained for a 100 ml wastewater sample taken at the inlet to wastewater treatment plant.  The tests were performed using the standard methods. Dete

Define the precedence diagramming methods, Define the Precedence Diagrammin...

Define the Precedence Diagramming Methods a) Activity on Node (AON) with arrows for dependencies b) Uses all forms of precedence relationships

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