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

Differentiate between short column and slender column, Differentiate betwee...

Differentiate between Short Column and Slender Column Short Column It is a column of  rectangular section, the effective length of which does not exceed 12 times of  its lea

Use single lock nuts or double lock nuts, Question In linking fenders t...

Question In linking fenders to pier organizations, would single lock nuts or double lock nuts be used? Answer In pier structures connection offenders to piers is a

WBM Road, if the WBM Road is constructed with 80mm , 40mm metal what will b...

if the WBM Road is constructed with 80mm , 40mm metal what will be the depreciation factor per year, how much thickness of the layer will be reduced per year due to trafic and rai

Matlab program, for calculating the bending moment in which the loading and...

for calculating the bending moment in which the loading and the length of continuous beam is taken from the user

Sieve analysis - soil mechanics and foundations, Sieve Analysis - Soil Mech...

Sieve Analysis - Soil Mechanics and Foundations a. Sieve Analysis used to obtain the grain size distribution of coarse-grained soils (sands and gravels) larger than 0.075 mm (r

Stability of column, what is end condition how effected length is calculate...

what is end condition how effected length is calculated

Importance of general and subsidiary rules, Q. What is the importance of Ge...

Q. What is the importance of General and subsidiary rules. What is the main differences between the two. Ans.- Importance of General and subsidiary  rules - General and su

Shallow bedrock condition adverse for open berth piers, Question What i...

Question What is the reason that shallow bedrock condition adverse for open berth piers? Answer Most severe load on piers generally is horizontal load due to berthing

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