Dear Mrs Chandni, I suggest ...
Published by Predrag Marković, Ekofutura - Design Engineer
Dear Mrs Chandni,
I suggest you to see at www.eecusa.com. This is a manufacturer from USA. They produce MBBR container type of WWTP, with standard capacity up to 350 m3/day and more. I think they will have what you need.
Best regards,
Predrag Markovic