Projects

DAF Separation Chamber:

The DAF separation cell is designed using elements of American Petroleum Institute’s publication 421 Feb. 1990, “Design of Oil-Water Separators” to ensure the best possible use of particle rise rate performance. The separation cell can be fabricated with a flat bottom or a rectangular “V” bottom. The DAF cell is typically manufactured from carbon steel, but other materials of construction are available as an option.

DAF Surface Skimmer:

HydroFlo provides a removable float skimming system with frame assembly and drive motor, sprockets, chains and full width stainless steel skimming blades. The skimmer blades are mounted on swivel pins that are fastened to the skimmer chains, which maintain the blades in a down position at all times. The conveyer chains are provided with drive sprockets on a full width shaft at the drive end and four independent idler sprockets at the return end. The skimmer system frame comes equipped with a sprocket tension adjustment device and the carrying and return tracks for the chain. The entire system is self supporting with side and end channels, and cross members with lifting lugs that permit removal of the skimmer assembly as a complete unit for easy cleaning and service. The skimmer drive system comes with a hollow shaft, maintenance free gear reducer. The skimmer system can be made vapor tight with the addition of optional cover panel.

Air Introduction Systems: HydroFloTech specializes in two fundamental air introduction systems. Both systems are equally capable and may be chosen depending on client preferences.

Option 1: Recycle / Air Dissolving System (RAD):

The HydroFloTech dissolved air flotation system comes standard with a recycle water air dissolving system rated at 50% of the DAF design flow, providing an air to solids ratio (A/S) of between 0.015 and 0.040 lbs air/lbs. solids. Standard models are designed for 100 psi, 100 degree F. The air dissolution tank is fitted with an internal water cascading nozzle system to ensure efficient mass transfer and air/water contact. The tank is provided with an independent safety pressure relief valve and pressure gauge. The air dissolution tank is provided with an external, clear sight tube with water/air interface level float sensor system for automatic water/air level control. Manual flow control valves are provided for balancing the recycle rate, for the rate control of the air addition, the saturated recycle rate to the DAF inlet reaction jet, and the pump by-pass flow volume.

Option 2 Recycle / Air Dissolving System (CRAD):

The HydroFloTech DAF pump is specially designed to be used in dissolved air flotation (DAF) systems. · Clarified effluent from a DAF unit is pumped by the DAF pump under high pressure. Air is introduced into the pump suction by an eductor loop. The air is sheared into small bubbles by the pump and then dissolved into the water under high pressure. · When the pressure is released (at the DAF influent), the dissolved air comes out of solution in the form of tiny (~10 – 50 micron) bubbles. These tiny bubbles attach to oil, grease, and solid particles and float them to the surface of the DAF unit. The floated material is then removed from the surface by a skimming device.

Integrated Mechanical Sludge Thickener (Optional)

The bottom sludge thickening auger is designed to turn/fold the sludge over (at a relatively slow rate) and conveying the sludge to a central discharge point (as opposed to stirring/turning the material in a single direction) results in a more consistent, less stratified sludge blanket.  As the sludge compresses/thickens toward the center of the thickener and along the thickener’s compressing edge, water passes up into the clarifier at the thickeners ends and at its rising edge homogenize and dewater sludge and grit as it moves it to a central convergence point, where it freely flows out the sludge outlet nozzle. Our unique design allows us to use less HP drive mechanism because of the smaller overall diameter.  The drive mechanism is attached directly to the thickener with a removable safety cover. The auger is accessible by submerged bolt-on manway with Buna-N gasket material.

The sludge collection area can be designed where a sludge thickening auger may be added at a later point in time.

 Control Package:

All HydroFloTech dissolved air flotation systems are fully automated. Control packages (depending on your specific requirements) are available in either basic relay logic control, or a fully state of the art PLC with touch screen HMI and our sophisticated treatment algorithms. The relay logic controls package allow basic reconfiguration of the original system settings, while the PLC based package allows maximum flexibility to change the process parameters, as well as tight control that minimizes chemical usage. All enclosures are NEMA 4x.

Effluent Monitoring (optional): As and when mandated by the local controlling authority, the effluent quality must be continuously monitored. A two-pen recorder is to be used to monitor effluent flow rate and pH. The recorder is to be equipped with a flow totalizer. Any effluent pH deviations will trigger an alarm and system discharge will be halted.