• Daftech Engineers Private Limited

Clarifier

Daftech Engineers offers a DAF clarifier. Dissolved air flotation (DAF) is an effective method of treating industrial wastewaters especially from paper mills, dairy units, textile industries, tanneries and food processing like edible oil refining, fisheries, meat processing, etc. Recent applications would also suggest that it is an ideal process for clarification of mixed liquor from aeration basins of activated sludge systems. State of the art DAF clarifiers are circular in shape with a retention of 3 minutes, compared to 2 3 hours in sedimentation clarifiers, and have been improved further with the elimination of the external overflow weir which use extra space and warrant extra supporting columns. Daftech float cells operate with a pressurized recycle flow of 25 30% and generate fine bubbles of 30 micron size which lift the suspended particles to the top surface from where it is picked up by a spiral scoop and discharged by gravity to the source of disposal. Clarified water from float cell will not have TSS more than 50 ppm. BOD reductions generally achieved vary between 50 and 80% depending upon the nature of solids removed. The other advantage of using flotation is that the sludge recovered has a much higher consistency 2 3.5% as against 0.8 1 % from the bottom of conventional sedimentation clarifiers. Daftech float cell employs imported German variable speed gear motors for the drive system. The speed is steplessly variable over a range of 3 21 RPM. The unit is continuously self cleaning and requires minimum maintenance. Where the standard construction is mild steel with a special anti corrosive paint, fabrication in SS 304 and 316 also are offered to overseas clients and special applications. The equipment comes prefabricated and can be erected at site in 5 7 days