Hi Sanjay, thanks for the ...

Hi Sanjay, thanks for the quick response. Understand that the sewage will be a combination of kitchen and domestic shower/toilet waste. Do you know what is the average temperature of the inflow sewage? As long as we keep it within the building - should be above freezing point. However, if we want to transfer sewage between the buildings - it could be tricky - the sections of external pipes can freeze (likely in the time when there is no flow through) as the flow is intermittent (not constant). May be you need to consider individual TP at each building, however it might be impractical if there are too many small buildings. What are the minimum treatment requirements (WQ prior to discharge into the environment)? Where do they source potable water - (snow melt?). Is re-use of waste water - an option (e.g. for toilet flush)? As to the treatment process - guess if you place the TP inside the building(s) (basement) - the water should be kept above freezing point. Then we have a low oxygen challenge - but it should be solvable for a (compulsory) biological stage - in worst case - you can use a blower to inject air bubbles. Subject to good engineering - should be able to get it all working. Sorry for my generic comments, understand you are looking for practical (off the track) solutions - but not sure if we can find one that is proven and will fit perfectly into your situation. Hence - I concentrated more on the general concept - hope it will be of some help. Regards, Iouri