Use of DAF for Seawater Pretreatment

Hello I have an question about use of DAF for seawater pretreatment. Do you think that dissolved air flotation is an effective technology for removal of algae from seawater? Is anyone aware of successful DAF applications? thanks,

6 Answers

1. To date, the use of DAF had a mixed success bacause of the differences of seawater and fresh water for which most DAF technologies are developed. Main differences entail water density and the need ot operate at higher pressures, the size of marine algae which often are an order of magnitude smaller than fresh water algae and therefore require the use of smaller size bubbles, and the charge of seawter particles, which usually is signficnalty lower than that of fresh water particles and therefore requires re-design on the coagulation and flocculation chambers.

2. Mr. Ahmed, thanks for the detailed explanation. I am uploading the file of DAF description in the document section so that other members can also go through it. Thanks, Vishakha

3. Listed below are a few of the applications in which a DAF system is efficient and cost effective. Aircraft Maintenance Algae Removal Automotive Industry Bakery Waste Ballast Water Canning Chemical Processing Plants Dairy Industry Fiber Recovery Fly Ash Latex and Rubber Industry Meat Packing Mining Paint Waste Pet Foods Pharmaceutical Potato Processing Poultry Processing Produce Water Pulp and Paper Mills Refinery Rendering Seafood Processing Slaughter House Tank and Truck Cleaning Tanning Textiles

4. Dear Vishakha, I have sent the DAF Description on your email as I do not know how to upload file in this comment. Thank you, Engr. Mansoor Ahmed

5. Thanks Mr. Ahmed for answering my querry. If you can provide the details of DAF system it will be highly appricieted. Thanks again, vishakha

6. Dear Vishakha, DAF is a successful technology in replacement of Sedimentation Tanks (Primary Clarifiers)as requires lesser space and efficient in removing TSS (by coagulation+flocculation). Applications of DAF are mostly in Wastewater Streams and also the reasons it requires lesser space than Sedimentation Tanks; Wastewater Treatment Plants in General Oil Refinery Waste Treatment in collaboration with CPI Edible Oil Mills removal of Oil from Wastewater Stream Recovery of Pulp from Paper Mills Wastewater Streams In wastewater treatment plants where there is space constraints For Fresh or Sea Water, most of the times we need to remove Sand/Silt and some cases Algae. We employ Primary Sedimentation+Multimedia Filter+Micron Filter and then Ultra-Filtration+Reverse Osmosis. In cases we can employ DAF System for Algae/Silt/Sand Removal then Multimedia Filters+Micron Filters+UF+RO. Should you need any detailed description of DAF system, I can provide it to you then. Thank you, Engr. Mansoor Ahmed PhD. Scholar - Environmental Engineering