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

Trusses, Determine the support reactions for the truss shown below

Determine the support reactions for the truss shown below

Strength of concrete at the transfer stage, Strength of Concrete at the Tra...

Strength of Concrete at the Transfer Stage Concrete strength in the member at the transfer stage should conform to the design requirements. The frequency of the sampling and t

Method of observation by satellite, Q. Method of observation by satellite? ...

Q. Method of observation by satellite? The difference between a photographs and imageries needs to be understood first. A photograph covers a specific area within its view and

Arches, construction of arches

construction of arches

Survey obstacles in both chainage and ranging, Askobstacles I ranging andsu...

Askobstacles I ranging andsurvey question #Minimum 100 words accepted#

Bridge design, criteria for economical span length in bridge

criteria for economical span length in bridge

Surveying land, principle of working from whole to part

principle of working from whole to part

Marine pilling, what are the problems in traditional marine pilling system ...

what are the problems in traditional marine pilling system of steel tubular pile with concrete infill

Static, Determine the moment of inertia with respect to the x axis for the ...

Determine the moment of inertia with respect to the x axis for the shaded area shown (Figure 2) . The dimension is a = 2.00m .

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