BRIEF DESCRIPTION OF THE INTERVENTION:
In light of the problems related to the disposal of sewage sludge and to optimize the costs of transport and subsequent disposal of the sludge produced, Acquedotto Pugliese SpA in its capacity as Integrated Water Service Manager of the Puglia Region, is pursuing the solution of increasing the% of dry matter to be removed by decreasing the water content in the mud through the construction of solar drying greenhouses in various Apulian cities including: Brindisi, Copertino and Casarano.
The aim is to create a complete chain of treatment of the sludge produced by a purification plant extracted from solar greenhouses with a water content between 20-30% (i.e. with a dry content between 70-80%) unlike current dehydrated which originates mechanically dehydrated sludge with a water content of about 80%.
CLIENT:
Acquedotto Pugliese SPA
OBJECT OF THE INTERVENTION:
final design for the construction of greenhouses for solar drying of the dehydrated sludge produced by the purification plants managed by aqp:
1) lot 3: Brindisi
2) lot 5: Copertino and Casarano
DESIGN AMOUNTS:
The amount is € 107,000.00 for LOT 3 and € 107,000.00 for LOT 5.
Il sistema di essiccazione si contraddistingue per il suo bassissimo impatto ambientale, nonché per l’assenza di emissioni odorigene e quindi per il buon inserimento dell’opera all’interno del contesto urbano di riferimento.
Con il processo di essicazione solare, il fango che viene ottenuto è abbastanza secco per evitare processi biologici che generano odori, ma è ancora sufficientemente umido per evitare la produzione di polvere.
Grazie alla struttura porosa, si raggiungono elevate velocità di evaporazione e di efficienza di essiccamento. I fanghi essiccati prodotti sono stabili, con granuli tondi, separati tra loro, e facili da movimentare grazie all’elevato grado di secco.
BRINDISI
COPERTINO E CASARANO
PROCESS DESCRIPTION:
- The structures are presented as simple greenhouses with a steel supporting structure, polycarbonate cladding and roofing on a concrete slab.
- The incoming sludge is discharged to the ground through the use of n. 4 outlets placed in strategic points and, subsequently, through the use of mobile digging cranes, are distributed throughout the plant surface of the greenhouses.
- Inside each greenhouse there is the installation of air recirculation fans and for the entry of air.
- At the end of the dehydration phase, the dehydrated sludge is led into a hopper from which an auger originates which leads it into a container, from which it will be collected using heavy vehicles that will lead it to disposal.
- The exhausted air will be treated by means of a two-stage horizontal scrubber before being released into the atmosphere.
SOLAR GREENHOUSE OPERATING PRINCIPLE:
solar radiation combined with the movement of air generate the evaporation of water from the muddy mass.
The structure, very similar to a greenhouse for flower cultivation, helps to “force” a completely natural action. Also the ventilation is always forced to facilitate the speed of moisture transfer to the air.
The sizing of the solar drying treatment requires the climatic data of the site of interest (temperatures and solar radiation) on which the evaporation capacity of the water in the greenhouse and therefore the drying efficiency depends.
Essentially a solar drying plant consists of:
- Waterproof concrete base with a steel greenhouse and polycarbonate covers,
- Sludge handling system (by means of augers and overhead cranes),
- Air handling system,
- Air treatment system (if any).
Our Services
- Designs complete industrial and civil sewage treatment plants with construction details;
- Designs non-standard ecological machines with optimization and customization:
- Designs revamping of existing plants with a detailed study of the situation before and after the intervention;
- Builds plants from scratch or carries out specific revamping as General Contractor;
- Produces standard equipment with a dedicated application, providing the turnkey package with performance reports that are provided to the customer;
- Management of plants including staff of proven experience;
- Provides a sales structure that branches throughout Italy specializing in corporate core business.