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

Define advantages of shock transmission unit, Define Advantages of Shock Tr...

Define Advantages of Shock Transmission Unit? (a) STU is simple to install with minimal traffic disruption. (b) STU can be used for strengthening of existing bridges also. T

Landslides induced by rainfall, Landslides induced by rainfall After r...

Landslides induced by rainfall After rainfall, groundwater pressure is built up and this elevates ground water table. Water inside the pores of soil reducesthe effective stres

Properties of bricks, Properties of Bricks The required properties of g...

Properties of Bricks The required properties of good bricks are following: A.   Color: Color should be bright and uniform. B.   Shape: Bricks should have plane faces.

Orientation of wing walls in designing of bridge abutments, Question Wha...

Question What is consideration in selecting an orientation of wing walls in designing of bridge abutments ? Answer There are three familiar arrangements of wing walls in

Impact of possible energy, a) Take into consideration the boiler efficiency...

a) Take into consideration the boiler efficiency, and verify the cost of heating the building, during the heating season, using present oil and gas prices.  b) Investigate the i

Explain use of scour valve, Q. Explain Use of Scour Valve? Scour Valve ...

Q. Explain Use of Scour Valve? Scour Valve - Scour Valve at depressions on the main for clearing and emptying the pipes. It is also called blow off valve or Drain valve. This t

Loss of prestress due to elastic shortening of concrete, Loss of Prestress ...

Loss of Prestress due to Elastic Shortening of Concrete Due to elastic shortening of  concrete, tendons are able to reduce their stretched length to the same extent upto which

Slurry flow dynamics, how does the particle number and size affect the slur...

how does the particle number and size affect the slurry flow in a centrifugal pump?!

Explain equation for change interval, Explain equation for Change Interval ...

Explain equation for Change Interval y = t + v / 2a + 64.4G Where:  y = length of yellow interval (sec)     t = driver perception/reaction time (1.0 sec generally used)

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