Environmental Question, Civil Engineering

Assignment Help:
An activated sludge tank treats 1 MGD from the primary clarify and has an X of
2200 ppm SS. The water euent is 0.9 MGD. 1.0 MGD of the sludge is recycled back into the tank
and has an [SS] of 3980 ppm. The concentration of the BOD exiting the primary clarier is 200
ppm.
(a) What are Qw and Xw?
(b) What are Qc and Xc?
(c) What are Q1 and X1?
(d) What is Xe? (Answer = 24.4 ppm)
(e) Calculate the volume of the tank that will satisfy the following requirements:
(e-1) BOD loading < 35 lb BOD/1000 ft3day
(e-2) Sludge age > 5 days
(e-3) Aeration period > 4 hr

Related Discussions:- Environmental Question

Use plain dumb-bell type and center-bulb sort, Question While selection...

Question While selection of waterstop, shall engineers use plain dumb-bell type , center-bulb sort ? Answer Plain dumb-bell kind is used for joint site where sm

Use of stone aggregates in road construction, Use of Stone Aggregates in Ro...

Use of Stone Aggregates in Road Construction Stone aggregates are extensively used in roads in pavement layers. They are obtained from natural rock. The following geological

Define cleaning for underwater inspection of bridge, Define Cleaning for Un...

Define Cleaning for Underwater Inspection of Bridge? Before any structure can be inspected, it is necessary to expose the surface material of the structure. Wherever there is m

Stress, stress and there types

stress and there types

Estimate the activity durations - construction management, Estimate the Act...

Estimate the Activity Durations The total labor cost for emergency bridge rehabilitation on an interstate highway is $5,716,440.  The average crew-hour cost is $15,879 for this

Determine the meaning of relaxation of steel, Determine the meaning of Rela...

Determine the meaning of Relaxation of Steel If the strain in steel is kept constant, it is seen that stresses in it reduce with time. It is called as relaxation of steel. Ten

Preparation for underwater inspection - tool and equipment, Preparation for...

Preparation for Underwater Inspection - Availability of Tools and Equipment The engineer-in-charge, before taking up the inspection, should list out the complete equipment req

Calculate the deposited amount - construction management, An engineer depos...

An engineer deposits an "X" amount every 6 months for 3 years so that she'll have $10,000 at the end of this period. The interest rate is 5% per year which is rebalanced every 6-mo

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

which IS code give details about Strength of Brick?

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