Abengoa's presentation about red tides prevention and its influence on the cost of desalinated water production.

1. 1
ABENGOA WATER
Red Tide Event Prevention and Influence on
Desalinated Water Production Cost
8-9 February, 2012 Muscat – Sultanate of Oman
Innovative Technology Solutions for Sustainability

2. Red Tide Event Prevention and Influence on Desalinated Water Production Cost
Index:
Red tide origin
Abengoa Water experience
Desalinated water cost case study
Other options

3. Red Tide Event Prevention and Influence on Desalinated Water Production Cost
Red tides: harmful algal blooms (HABs) that occurs when toxic microscopic algae in
seawater proliferate to higher than normal concentration.
While are known that contribute to HABs, how these factors come together to create a
bloom of algae are not yet well understood.
Sometimes, HABs occurs when nutrients from sources such as lawns and farmlands
reach the sea and build up at a rate that overfeeds the algae that exist normally in the
environment.
Color depend which of the three primary types of phytoplankton are responsible for the
problem: dinoflagellates, diatoms or blue-green algae.
Of more than 4000 marine phytoplankton species only 50 to 60 are believed to be toxic.
Scientific studies indicate a global increase in
occurrence and geographic extent of harmful
red tides

4. Qingdao Algae Bloom Experience

5. Qingdao Algae Bloom Experience

6. Qingdao Algae Bloom Experience

7. Qingdao Algae Bloom Experience
Turbidity: normal range 2-5 NTU, severe increase to 15 NTU during algae period
TMP: normal range 0.2-0.3, temporary increase to 0.4-0.5 bar during algae period
Permeability: normal range 300-500 lmh/bar, temporary drop to 200-300 lmh/bar during algae period
Fe dosing: normally 0 mg/l, temporary increase to max. 1 mg/l during algae period

8. Qingdao Algae Bloom Experience

9. Desalinated water production cost. Basic case study.
Case study:
Pretreatment design based on DAF + UF
Plant capacity 100.000 m3/day
22,0 MIGD
35 Hm3/year
7.701 MIG
Avalability 350 days/year

10. Desalinated water production cost. Basic case study.
Financial data
Equity 25%
Debt 75%
Interest rate 6%
Period of debt return 15 years
Period of construction 2 years
Period of operation 25 years

11. Desalinated water cost. Basic case Study
Cost increase due to pretreatment improvement
Structural cost increase due
to DAF
0,03 to 0,04 €/m3
1 to 1,4 M€/year
Cost increase with DAF in
operation
0,05 to 0,06 €/m3

12. Other options to consider
Alternatives to minimize red tides effects in Desalination Plants:
Non surface intake systems: vertical beach wells, radial wells infiltration, engineered
infiltration galleries
Global water network connected with alternative sources
Partial open intakes / non surface intakes
Plant monitoring preventive management
Avoiding areas with existing sewage or industrial discharges. Nutrients reduction
UF membranes development and operational modes improvements

13. Innovative Technology Solutions for Sustainability
Thank you