View
219
Download
0
Category
Tags:
Preview:
Citation preview
WASTE WATER SYSTEM FUNCTIONINGWASTE WATER SYSTEM FUNCTIONINGVISIT TO UDINE SYSTEMVISIT TO UDINE SYSTEM
December 10th 2010December 10th 2010
WASTE WATER’S PLANT ARRIVAL CANALWASTE WATER’S PLANT ARRIVAL CANAL
All waste water coming from our houses, schools, …activities pipes, arrive (inflow) to the depuration plantSo those waters contain all our organic refuse, all locals, clothes and other…. Washing water, car refuse and rubbish coming from the streets…
DEPURATION PROCESS STEPSDEPURATION PROCESS STEPS
Depuration processes can be divided into three groups:
1.MECHANICAL PROCESSES.They permit to remove from waste waters solid not melted materialsThey include: filtering, suspended sand removal, oils removal
- FILTERING STEPArriving water passes through an iron grill that blocks solid refuses.We learned that’s important not to throw used cotton sticks in the wc because they can pass through the grill and return to the environment in the sea
- SAND REMOVAL FROM - SAND REMOVAL FROM WATERWATER
During this step sands deposit
in the bottom because of
gravity. With this purpose
water flows slowly
SAND REMOVAL REFUSESAND REMOVAL REFUSE
Discarded sands are gathered
up in a tank
--OIL S REMOVAL OIL S REMOVAL DISOLEATURADISOLEATURA
Gli oli e i grassi presenti nelle acque reflue, entrano in questa vasca: essendo meno densi dell’acqua galleggiano…
Waste water oils and fats enter in this basin: since they are less dense than water, they float….
…A mechanical rotating arm turns around slowly and a connected shovel drives oils to a rubbish dump
This is a particular of the mechanical shovel driving out oils
2. BIOLOGICAL 2. BIOLOGICAL PROCESSESPROCESSES
The biological treatment
reproduces a natural process:
biological decomposition
processes of organical matter
(our refuse) happen more
quickly than normal
Organic matter in water is
decomposed by
microorganisms; oxigen is
needed (aerobical process).
For this reason oxigen is
continuously introduced in the
so called biological basin.
Aerobic bacteria feed on
organic carbon from melted
substances and transform it in
carbon dioxide that releases in
the atmosphere.
As we can see in the photo
water continuously boils….
Some decompositors
SECONDARY SEDIMENTATIONSECONDARY SEDIMENTATION
From the biological
basin water arrives in
sedimentation basins.
Here, the so called
mud-flocks, produced
during the aerobic
reactions, deposit on
the basin bottom
I FIOCCHI DI FANGO SI DEPOSITANO SUL FONDO I FIOCCHI DI FANGO SI DEPOSITANO SUL FONDO
E l’acqua pulita viene spedita nel fiumeSfiorando lungo delle canalette laterali.
At the end cleaned water outflows to the river passing by a narrow gutter
DEPOSITED MUD IS DEPOSITED MUD IS UTILIZED TO UTILIZED TO PRODUCE GASPRODUCE GAS
The mud Gathered up is
subjected to an aerobic
fermentation, inside big
closed digest plan.
The aim is pasteurize the
mud and then transform in
a gas rich in methan.
Methan is used as fuel to
produce electricity for the
entire deputation plan.
…. Here gas is trasformed into electrical energy
Here remaining
mud is dried….
…….then checked
THIS MUD CAN BE THIS MUD CAN BE
REUTILIZED AS MANUREREUTILIZED AS MANURE
… and saved,
This mud, after chemical
analysis, can be utilized
as manure.
The cicle is now
completed.
Recommended