Preliminary storage and physiochemical treatment platform in Ferrara

Integrated solid/liquid waste storage method

• facility for waste storage in big bags and drums with a simultaneous storage limit of 650 tonnes;
• special watertight tanks inside the facility;
• 15 tanks with a total instantaneous capacity of 450 m³;
• suitable covered containers in an outside yard with a simultaneous storage limit of 400 tonnes.

Treatment lines

• physicochemical treatment;
• filter press.

Layout of the physicochemical treatment line

• mixing of wastewater to be treated;
• neutralisation/precipitation of metals in an alkaline environment with sodium hydroxide and calcium hydroxide solution;
• clarification/flocculation with flocculating agents (ferric chloride);
• precipitation with the addition of anionic polyelectrolytes;
• static sedimentation for phase separation;
• drum filter for the retention of suspended solids.

Filter press

• filter pressing with the addition of milk of lime to improve dehydration;
• transfer of filter pressed sludge to containers.

All wastewater flows into the centralised pre-treatment tank for an initial mixing phase. This is followed by neutralisation, then flocculation. The overflow is transferred to a mechanised clarifier. The clarified matter leaving the sedimentation tank is transferred to a drum filter to remove the final remaining suspended solids. The sludge leaving the sedimentation tank is stored in two static thickeners. From there, it is sent to a filter press in which it is dehydrated further before external disposal. The physicochemical plant drainage flows into a container that collects the waters of the industrial zone where the plant is located, connected to the municipal blackwater system which goes to the Ferrara purification plant.