420
Alcalde et al.
Raw sewage
10E+08
C
1. __ F+
.. ::J
c 0 E
••• A " ,
___ Somatic coliphages
... ~ , OE+07
~+.' ... ~~
E ""s: ...
~
. .
,/
---e------e ~
·S
; 1.0E+06
. ------.
...
~ ~
= 1 OE+05
Jun
Jul
Aug
Sep
Ocl
Nov
Dec
Jan
Feb
Mar
Fig. 4. Seasonal variation of the content of the three indicators monitored in the raw sewage
U 1:+07
~ F+ 1
_ _ Somat'" collphages
1' ,
,/' ...............
,'. ..... - ... - . Fecal collforms
,/
.. ------e ,_
,,--•
I
.... . . /
-'-" . . /" --..
After anaerobic pond
1(1:+05 +---r-----,---,----,----r---,..-----,-----,----,-------1
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Jan
Feb
Mar
Fig. 5. Seasonal variation of the content of the three indicators monitored in the anaerobic
pond effluent.