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

Foundation, Explain briefly shallow foundation?

Explain briefly shallow foundation?

Plane table surveing, in plane table surveying which activity is done first...

in plane table surveying which activity is done first whether centering or levelling?

Calculate the tension force in sling - lifting load, Calculate the Tension ...

Calculate the Tension Force in Sling The rigging configuration shown below will be used to lift a bridge girder using a 200-ton capacity luffing jib crane onto the foundation a

Cleaning and greasing of steel sliding bearings, Cleaning and greasing of s...

Cleaning and greasing of steel sliding bearings : Following equipments are required for greasing of steel sliding bearings: 1. Jacks (50 ton capacity) - 2 nos. 2. Hard wo

Design volume of the aeration basin - sewer construction, Design volume of ...

Design volume of the aeration basin - sewer construction: Problem: What is the design volume of the aeration basin? Solution Assuming that 30% of the plant influe

Inspection of girder bridge, Q. As an AEN in charge, what inspection will...

Q. As an AEN in charge, what inspection will you under taken at the time of inspection of Girder Bridge 3 x 60 feet. Please explain the important items to be o

Wmm, what is material of wmm plant

what is material of wmm plant

Flash point test, Flash Point Test: The flash point is the temperatur...

Flash Point Test: The flash point is the temperature at which the bitumen gives off vapours which ignite in the presence of a flame. The flash point temperature gives the cri

Stress design method, You have been selected to assist the structural engin...

You have been selected to assist the structural engineer for a bridge replacement project.  Your task is to design the size of the footing for an interior bridge pier, based on the

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