WASTE WATER SYSTEM FUNCTIONING VISIT TO UDINE SYSTEM December 10th 2010.

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Transcript of WASTE WATER SYSTEM FUNCTIONING VISIT TO UDINE SYSTEM December 10th 2010.

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WASTE WATER SYSTEM FUNCTIONING VISIT TO UDINE SYSTEM December 10th 2010 Slide 2 WASTE WATERS PLANT ARRIVAL CANAL All waste water coming from our houses, schools, activities pipes, arrive (inflow) to the depuration plant So those waters contain all our organic refuse, all locals, clothes and other. Washing water, car refuse and rubbish coming from the streets Slide 3 DEPURATION PROCESS STEPS Depuration processes can be divided into three groups: 1. MECHANICAL PROCESSES. They permit to remove from waste waters solid not melted materials They include: filtering, suspended sand removal, oils removal - FILTERING STEP Arriving water passes through an iron grill that blocks solid refuses. We learned thats 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 Slide 4 Slide 5 - SAND REMOVAL FROM WATER During this step sands deposit in the bottom because of gravity. With this purpose water flows slowly Slide 6 SAND REMOVAL REFUSE Discarded sands are gathered up in a tank Slide 7 - OIL S REMOVAL DISOLEATURA Gli oli e i grassi presenti nelle acque reflue, entrano in questa vasca: essendo meno densi dellacqua galleggiano Waste water oils and fats enter in this basin: since they are less dense than water, they float. Slide 8 A mechanical rotating arm turns around slowly and a connected shovel drives oils to a rubbish dump Slide 9 This is a particular of the mechanical shovel driving out oils Slide 10 2. BIOLOGICAL PROCESSES The biological treatment reproduces a natural process: biological decomposition processes of organical matter (our refuse) happen more quickly than normal Slide 11 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. Slide 12 Some decompositors Slide 13 Slide 14 Slide 15 SECONDARY 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 Slide 16 I FIOCCHI DI FANGO SI DEPOSITANO SUL FONDO Slide 17 E lacqua pulita viene spedita nel fiume Sfiorando lungo delle canalette laterali. At the end cleaned water outflows to the river passing by a narrow gutter Slide 18 Slide 19 DEPOSITED MUD IS UTILIZED TO PRODUCE 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. Slide 20 Slide 21 . Here gas is trasformed into electrical energy Slide 22 Here remaining mud is dried. Slide 23 .then checked Slide 24 THIS MUD CAN BE REUTILIZED AS MANURE and saved, This mud, after chemical analysis, can be utilized as manure. The cicle is now completed.