Dear Mr Elmalieh,I didn’t ...

Dear Mr Elmalieh,

I didn’t received the plant flow sheet but I hope that my considerations can help you.

Two questions:

1)     Why so big holding tank (30 hours HRT!)? In any case, the holding tank must be aerated.

2)     Why the screen after the holding tank?

Considering your very low flow and organic load, I recommend SBR plant instead continuous activated sludge plant.

To have very simple and efficient plant I propose:

-Screen

-Pumps

-SBR (low charged, composed by two aeration tank 35 m3 each)

-Blowers

-Holding tank and chlorination reactors V: 10 m3 with mixer

-Pumps

-Pressure sand filter

-Sand dry bed.

I know that my design is very generic because I don’t know your local and specific requirements so please use it as an idea.

Best regards