"NY" Wrote in message:
"Jim K" wrote in message
o.uk...
It's a two-chamber (two-manhole) septic tank, with an outflow of
treated water (guess where it goes!)

"Treated" in what way?

Settle ment and anerobic digestion, like any other two chamber septic
tank. The out flow isn't particulary pleasant but it's not raw
sewage.

I doubt much anaerobic has gone in in the liquor, a smidge of
aerobic in the 2nd chamber (depending on flow rates) & then "down
the nearest hole" ending in a stream...

I thought that was the whole point of septic tanks and the advantage over
cesspits - that the sewage is treated enough (by settlement and
aerobic/anaerobic digestion) that the liquid *is* clean enough to discharge
into a soakaway....

By "Clean enough" you mean " the chunky bits have been seperated"?

"septic tank*is a chamber made of concrete, fiberglass, PVC or
plastic, through which domestic wastewater (sewage) flows
for*primary treatment.[1]*Settling and*anaerobicprocesses reduce
solids and organics, but the treatment is only
moderate.[1]*Septic tank systems are a type of*onsite sewage
facility(OSSF). They can be used in areas that are not connected
to a*sewerage*system, such as rural areas. The treated liquid
effluent is commonly disposed in a*septic drain fieldwhich
provides further treatment. However,*groundwater pollution*may
occur and can be a problem"

--
Jim K


----Android NewsGroup Reader----
http://usenet.sinaapp.com/