Sewage from toilets, kitchens and bathrooms carries pathogens and organic load that should never reach drains or water bodies untreated. For hospitals, residential towers, hotels and factories with large workforces, a sewage treatment plant (STP) is the practical answer.
An ETP is not an STP
Factories sometimes assume their effluent treatment plant can take domestic sewage as well. The two waste streams are very different, and mixing them upsets the treatment process. Domestic sewage needs its own STP.
How an STP is sized
Sizing starts with the population the building serves and the expected water use per person. From there the engineer works out:
- The daily flow and the peak hourly flow
- The organic load (BOD) the biological stage must remove
- The tank volumes and the air the blowers must supply
- The space available — compact designs suit basements and tight plots
Choosing the technology
Conventional activated sludge works well where space allows. Where it does not, compact packaged systems, moving-bed bioreactors or membrane systems treat the same load in a fraction of the footprint.
Operation decides performance
Even a well-designed STP fails without care. Blowers must run on schedule, sludge must be removed regularly, and the treated water should be tested periodically.
We design STPs for buildings of every size, prepare the drawings for approval and install and commission the plant on site.
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