Wastewaters from FGD treatment plant can no
longer be discharged into the sea due to tough
Italian and EU environmental regulations. In order
to overcome this major environmental problem,
ENEL decided to feed the prescrubber with fresh
and recirculated waters and install the Zero Liquid
Discharge (ZLD) plant so that no industrial
wastewater discharges are allowed by the entire
To overcome the problem, ENEL selected the
Softening – Evaporation – Crystallization (SEC)
process to treat the wastewaters and
reuse/conserve fresh waters. Aquatech supplied,
installed, commissioned the ZLD plant as an EPC
contractor with local associates.
The SEC plant comprises of 1 x 100% Softener
Clarifier (calcium reduction by soda ash dosing), 1
x 100% Falling Film type Brine Concentrators
(equipped with two Vapor Compressors operating
in series), 1 x 100% Crystallizer (equipped with
Thermocompressors) and 2 x 50% Belt Filter Presses.
The plant also includes several chemical dosing
systems, storage tanks, pumping systems,
electrical works (MCC, cable trays, cabling etc),
controls & instrumentation.