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

Storm water drainage - Road drainage and maintenance, Storm Water Drainage:...

Storm Water Drainage: In city streets, the disposal of rain water has to be done through a system of underground storm water drains. The water is collected at the roadside ke

Transportatoin engineening, explain the construction while aligning roads o...

explain the construction while aligning roads on hilly areas

Define the in-depth inspections for bridge, Define the In-depth inspections...

Define the In-depth inspections for Bridge? In-depth inspection is a detailed inspection of one or more members below the water level to detect any deficiencies not readily app

Surveying, define traverse.purpose of traverse, procedures of traverse, tak...

define traverse.purpose of traverse, procedures of traverse, taking linner measurment, types of traverse, convert the following quardnatal bearing to wcb. 1.OA= N15 deg10mins ''E,

Soil compaction, Soil Compaction: Soils used in road construction nee...

Soil Compaction: Soils used in road construction need to be thoroughly rolled and compacted. Compaction of soil is needed for the following reasons. (a) A well compacted s

#title difference, Write difference between the working stress method and l...

Write difference between the working stress method and limit step methode

Correction in bearing, write a c program To compute interior angles and cor...

write a c program To compute interior angles and correct them for observational errors and adjusting the bearing of remaining sides when the bearings taken on a closed compass trav

Calculation of crack widths arising from thermal movement, Q. Calculation o...

Q. Calculation of crack widths arising from thermal movement In the calculation of thermal movement, the below formula is used in most codes: w max =s x a x (T 1 +T 2 )/2

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

Diagram of distribution pipelines from an overhead tank, Q. There is a colo...

Q. There is a colony having 15 blocks of Type - II quarters, each block having 8 quarters. Make out a diagram of distribution pipelines from an overhead tank and up to the quarters

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