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 the pre-tensioned concrete construction, Define the pre-tensioned co...

Define the pre-tensioned concrete construction We understand that in the pre-tensioned concrete construction, stretched tendons are provided in the concrete moulds at the time

Show the specification of bricks, Q. Show the Specification of Bricks? ...

Q. Show the Specification of Bricks? Specification of Ist class Bricks- 1. Table moulded and wire cut. 2. It should have edges and parallel faces. 3. If struck with ha

Shear force and bending moment, relation between shear force and bending mo...

relation between shear force and bending moment and examples based on those relationship

Building Technology, which IS code give details about Strength of Brick?

which IS code give details about Strength of Brick?

Examine the state of stress at the junction of flange, Examine the state of...

Examine the state of stress at the junction of flange: A beam of I-section as shown in Figure (a) is subjected to a bending moment of 84.928 kN m and a shear force of 106.1 kN

Zero energy building , this is our final year project .please help me to gu...

this is our final year project .please help me to guide about it

Steel work design, 1) A building constructed from steelwork requires the fo...

1) A building constructed from steelwork requires the following sections to be designed: a. A beam carrying a characteristic permanent load of 11kN/m and a characteristic variable

Engineering project control, need help with my assignment. An Asian Pacific...

need help with my assignment. An Asian Pacific capital city proposes to design, construct and operate a new double track railway from the city to connect to its major airport. Pref

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