Hi All!!

Happy New Year.

I want to know the maximum and minimum dimensional limits for all wastewater treatment units of the largest to smallest possible plants.

If my query is not clear pls. let me know to let me know about further  information required.

Regards

JB

Dear Mr. Grrun

Thanks for the response. I think that I should put my question rather in the following manner:

I am just giving technical data for a PST let me know the no of circular or rectangular tanks with a mention of maximum dimensions for example for plant with a peak flow of 200 MLD.

Detention Time                                                  4 hrs
Approach (Flow through) Velocity, m/min             3.0
SLR m^{3 per m[sup]2 per day}[/sup]     2.0
WLR, m^{3 per m per day}                     500
Peaking factor                                                   3.0

Regards

JB
                                                                                                                                         

Dear Mr. grrun

Hi!


thanks a lot for the help extended u r right that the meaning of peaking factor is 3X.

Thank u very much for the calculations.

Now one more question that what maximum rectangular or circular dimensions could be considered for a reactor of such huge volume?

Regards

JB

Dear Jeff Naumann

Hi!

Thanks for your kind response.

My question is maximum minimum allowable dimensions I do stress again on "ALLOWABLE".

Hope u got my point of view.

regards

JB.

Dear M/s. JB/ gurrun/ Nauman J.

I was watching the discussions that all of u had. The efforts made by all of u are to be appreciated.

I feel that Mr. grrun need not feel sorry. Neither M/s. Nauman and JB are wrong.

I do think that Mr. JB did not put his question explicitly, rather his question gave a vague image but his query is interesting.

I feel that Mr. JB  wants to know about the design consideration and the allowable sizing limits of the reactors.

My explanation is as follows:

In the designing of any wastewater treatment unit the firs and foremost consideration is the most economical civil structure cost. I am considering civil structures because Mr. JB has mentioned huge plants,(I will come to the small plants later), moreover when you design any STP the available mechanical equipment also should be considered.

Coming to the point of STP design criteria and considerations, I have to say that as far as any STP unit is concerned, taken into consideration the points discussed in the above para, one has to address with utmost care the issues of turbulence, the approach velocity, the settling velocity, SLR, WLR, F/M ratio, MLSS, MLVSS etc.

Regarding the allowable Dimensions of the units is concerned appropriate dimensional ratios are mentioned any many text books that can be adhered to.

If Mr. JB is of the thought that he wants a single reactor for huge volumes it is not feasible economically. One can venture for such a thing at his own cost which is not advisable.

Possible good practices are for circular units a dia. of 100 m for example. Taking this as a yardstick rest can be decided. As far as the SWD limits are concerned again I wish to express that the points mentioned above have to be taken into account particularly the issue of turbulence in the settling units or any other unit where streamline laminar flow has to be taken care of. Similar is the case of approach velocity whuch has a great significance in designing of the units where it has to be properly taken care of failing which it may either result into erosion of the unit,  improper settling of the grit, settling of the food where it should not settle etc.

Hope that Mr. JB will get satisfied.

Regards

SA