Page 32 - Impiantistica industriale

NEW TRENDS

Figure 3 - Scheme of Green Hydrogen Project in Middle East.

the sea, water scarcity quickly became a critical hydrocarbons, fi ne suspended solids, heavy metals
issue. and other pollutants.
The scope of the study, summarized in Figure 3, Bridging the gap between the inlet streams com-
was a 2.5 MW Electrolyzer, designed to produce 1 position and the required quality at Electrolyzer
ton of hydrogen per day, and its ancillaries. feed was not an easy task, as hinted by the water
analysis in Table 1.
One of the pillars of such a scheme was the availa- Leveraging an extensive track record in produced
bility of 10 m /day of ultrapure demineralized water. water treatment and effl uent reuse on one side,
3
This is not a huge water demand, but in a desert and on ion removal up to the part per billion level
environment every drop counts, and the only avai- on the other, Cannon Artes designed a customized
lable source of clean water was a limited amount of solution to the water problem; once the technical
highly saline well water that, alone and at the net of side of the equation was solved, a detailed CAPEX
processing losses, could not satisfy the demand. and OPEX budget was defi ned as input for io con-
sulting’s master study.
A second, unusual source of water was identifi ed in The resulting water treatment plant’s process, de-
the produced water effl uent from a nearby oilfi eld: picted in Figure 4, can be divided into three sec-
produced water is the formation water that gets ex- tion: Pre-treatment, Ion-removal and fi nal Polishing.
tracted together with crude oil and represents one
of the major waste streams in oilfi elds by volume, The Pre-treatment section is functional to achie-
and one that needs highly specialized expertise ving, for each water source, a suitable quality for
Table 1 - Summary of inlet and technologies for its disposal or reuse, due to the downstream treatment: the process is straight-
and outlet water analysis. the high salinity and presence of large quantities of forward for the well water stream, while it is extre-

Demi water
Produced Water Well water
Unit ASTM D1193-91 -
Inlet Inlet
Type I
3
Flowrate m /day 20.0 10.0 10.0
Conductivity µS/cm 132’100 39’500 < 0.056
Total Dissolved Solids mg/l 102’000 26’500 < 5 ppb
Chloride mg/l 63’100 15’500 < 1 ppb
Sodium mg/l 30’900 6’790 < 1 ppb
Total Suspended Solids mg/l 180 25 Nihil

28 28 Impiantistica Italiana - Gennaio-Febbraio 2022