News
12 october 2017

Spidflow® Filter

The two-in-one solution for high-rate flotation and media filtration.

Improved SWRO membrane protection
Sea Water Reverse Osmosis membranes are highly sensitive and can become fouled if algae, suspended solids, soluble organic molecules and hydrocarbons in feed water are not removed adequately. An effective raw water pre-treatment system upstream of a SWRO system is therefore essential to prevent the risk of membrane clogging and to ensure durability.
In order to deal with the most challenging seawater quality (red tide, high levels of nutrients, suspended solids peaks, etc.) and feed SWRO membranes with consistently good quality of seawater, Veolia Water Technologies has developed and patented Spidflow® Filter.
This unique and compact solution combines into one structure the advantages of two proven pre-treatment processes: high-rate Dissolved Air Flotation (Spidflow®) and highrate Multimedia Granular Filtration (Filtraflo™ TGV).
 
Spidflow® Filter, combining the advantages of Spidflow® and Filtraflo™ TGV
Spidflow Filter benefits from all of the best features of these two technologies and presents a lot of advantages compared to other pre-treatment solutions (i.e. DAF+DMF or DAF+UF) such as lower footprint, higher availability, better performance of SWRO membranes and lower capital and operational costs.
 
Lower footprint
Spidflow Filter’s compact design translates to a very limited footprint. The high concentration of floated sludge does not require thickening stage and thus allows CAPEX and OPEX savings. Its modular design makes it an ideal solution for plants of all sizes and an obvious choice for extending existing capacity.
 
Higher availability
Spidflow Filter boasts a fast reacting solution to variations in raw water quality, enhanced by optimized hydraulics and Veolia’s exclusive white water injection nozzles. The frequency of backwashes is reduced thanks to an optimized filtration operation management. The plant’s full production capacity is ensured at all times.
 
Better performance of SWRO membranes
Spidflow® Filter is the ideal pretreatment solution to eliminate fouling and biofoulings agents, removing low density suspended solids, algae, oils and hydrocarbons as well as soluble organic compounds which are detrimental to SWRO membranes.
 
Lower capital & operational costs
  • Compact design leading to lower equipment and construction cost.
  • Energy-efficient design.
  • Optimisation of chemicals consumption.
  • Increases membrane life duration compared to UF pre-treatment.
     
Spidflow Filter Process
 
Spidflow process
 
Spidflow® Filter: the best choice for SWRO desalination pretreatment
 
A. Flocculation phase: increases collision probability between particles to increase floc size
  • Turbomix® technology to reduce the footprint of the flocculation tank if required
B.  Dissolved Air Flotation: flocs are carried to the surface by very fine and calibrated air bubbles, resulting from extensive R&D work. Flocs are then removed by skimming:
  • Deals successfully with raw seawater quality upsets (turbidity peaks, algal blooms or hydrocarbon contamination)
  • Guarantees consistent seawater quality to feed the subsequent filtration step
  • Very efficient Veolia Water Technologies’ skimming process: minimizes pretreatment water losses & lowers disposal volume with highly concentrated sludge production
C.  High rate Multimedia Gravity Filtration:
  • Removes smallest particles
  • Allows biomass development in the media depth which degrades biofouling molecules – Significant advantage compared to MF/UF process (only mechanical filtration  barrier) which does not remove dissolved nutrients
  • Provides long filtration cycles through constant feed water quality, even in the most challenging conditions
  • Fast maturation enabling to feed quickly & safely SWRO units.

     

Spidflow® and Filtraflo™ TGV

Veolia Water Technologies’ expertise on Spidflow® and Filtraflo™ TGV has been proven over many years, with more than 15 Spidflow units & 30 Filtraflo TGV units installed and operating successfully worldwide. Spidflow® Filter is the unique re-engineered combination of these two best-seller processes.

Long term performance has been assessed during extensive operation in challenging raw water conditions in different locations of the Gulf region. As a technology partner for Masdar (Abu Dhabi Future Energy Company), Veolia developed an advanced, low energy desalination plant in the UAE,  incorporating Spidflow Filter, with a performance consistently beyond expectations.