Dear Mary, having only ...
Published by Patrick Rambosson, Process and Sales Engineer at Lenntech BV
Dear Mary,
having only Sandfilter as Greywater treatment is not practical at all.
Greywater pollution is mostly made of COD and some TSS. Especially COD will create a lot of MLSS inside of the filter by bacterial growth, leading to frequent clogging of the filter and thus backwash. Furthermore, big material (food rests etc.) will clogg the filter and cannot be treated.
For small communities, better to make some lagoon or similar treatment. Please find some treatment option for decentralised/differenced wastewater treatment in the compendium of EAWAG. It is a real good ressource and best of all, softcopy is for free.
They also did some classes on Coursera and uploaded the videos on youtube:
https://www.youtube.com/channel/UCdDwnhvbqp2qMN1D4XyS8nA
Best regards,
Patrick