Specialist Group on Use of Macrophytes in Water Pollution ... - IWA
Specialist Group on Use of Macrophytes in Water Pollution ... - IWA
Specialist Group on Use of Macrophytes in Water Pollution ... - IWA
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The CW sector is formed by a sedimentati<strong>on</strong> bas<strong>in</strong>, an horiz<strong>on</strong>tal subsurface flow stage<br />
(about 1 ha) and a free water system stage (about 5 ha). The plant has been realized <strong>in</strong> a flood<br />
area near the Es<strong>in</strong>o River and it has been designed as periodic flood pro<strong>of</strong>ed. Part <strong>of</strong> the<br />
treated water is provided to the near <strong>in</strong>dustrial area for reuse by a dual net pipe.<br />
San Michele di Ganzaria (Catania)<br />
In Sicily many wastewater treatment plants (WWTPs) <strong>of</strong> small-medium communities are not<br />
<strong>in</strong> operati<strong>on</strong> due to management problems and high O&M costs. Extensive treatment<br />
processes, such as lago<strong>on</strong><strong>in</strong>g and CWs, potentially represent a more appropriate and<br />
susta<strong>in</strong>able treatment soluti<strong>on</strong> <strong>in</strong> rural c<strong>on</strong>texts, as <strong>in</strong> <strong>in</strong>land areas <strong>of</strong> Southern Italy where<br />
climatic c<strong>on</strong>diti<strong>on</strong>s and land availability are favourable. A first important experience <strong>on</strong><br />
Sicily has been a subsurface horiz<strong>on</strong>tal flow CW for the tertiary treatment (after a sec<strong>on</strong>dary<br />
treatment with trickl<strong>in</strong>g filter) <strong>of</strong> a rural community effluent <strong>of</strong> about 5,000 people located <strong>in</strong><br />
San Michele di Ganzaria, Eastern Sicily. The system is designed to wastewater reuse for the<br />
irrigati<strong>on</strong> <strong>of</strong> olive orchards cover<strong>in</strong>g about 150 ha. S<strong>in</strong>ce March 2001 a reed bed (for about<br />
1,100 P.E.) is <strong>in</strong> operati<strong>on</strong> with a flow rate <strong>of</strong> 1.75 L/s and a nom<strong>in</strong>al detenti<strong>on</strong> time <strong>of</strong> about<br />
2 days. The flow path from <strong>in</strong>let to outlet is 78 m and the total area is 1,950 m 2 . Mean<br />
removal efficiencies ranged from 65% to 88% (TSS), 53% to 84% (BOD5), 62% to 80%<br />
(COD), 14% to 52% (TN), 15% to 45% (TP), 95% to 99.8% (faecal coliforms). The CW unit<br />
seems to operate efficiently s<strong>in</strong>ce the start<strong>in</strong>g <strong>of</strong> operati<strong>on</strong> (from Barbagallo et al., 2002). A<br />
sec<strong>on</strong>d bed has been recently added as parallel l<strong>in</strong>e, doubl<strong>in</strong>g the treatment capacity <strong>of</strong> the<br />
system and the amount <strong>of</strong> treated wastewater (or better ―service water‖) available for<br />
irrigati<strong>on</strong>.<br />
____________________________________________________________________________________________________<br />
<strong>IWA</strong> <str<strong>on</strong>g>Specialist</str<strong>on</strong>g> <str<strong>on</strong>g>Group</str<strong>on</strong>g> <strong>on</strong> <strong>Use</strong> <strong>of</strong> <strong>Macrophytes</strong> <strong>in</strong> <strong>Water</strong> Polluti<strong>on</strong> C<strong>on</strong>trol: Newsletter No. 35 33
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