Please browse though the frequently asked questions on the dissolved air flotation process and the HyDAF system.
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“What is the capacity of the range of HyDAF dissolved air flotation systems?”
The HD range of HyDAF dissolved air flotation systems are designed for industrial applications where high solids loads are usually experienced. We have standard sizes that we manufacture but in each case we determine the most suitable model and dissolved air recycle system to suit the specific wastewater characteristics.
“Can the HyDAF dissolved air flotation system handle variable load and flows?”
This depends. In applications where chemicals are not being used, the HyDAF dissolved air flotation system can operate and effectively treat wastewater at any flow and solids load up to its design capacity. If chemicals are being dosed, then variations in flow and solids load will adversely effect the chemical process. In these cases, the installation of a balance tank upstream of the HyDAF dissolved air flotation and a constant feed rate is
“Do I need to dose chemicals into the wastewater?”
Dosing of chemicals into the wastewater upstream of the HyDAF dissolved air flotation system will improve the performance of the system. Whether it is necessary to dose chemicals depends on the water quality that is required.
“How much sludge will the HyDAF dissolved air flotation system generate?”
The amount of sludge generated depends on the amount of solids being removed and also whether chemicals are being dosed to enhance the performance of the HyDAF dissolved air flotation system. The dry solids concentration in the dissolved air flotation system sludge can be up to 10%. You can estimate the amount of sludge that will be generated by multiplying the solids load by the daily flow or alternatively give us a call and we will be able to assist. In larger applications the installation of a sludge dewatering plant will be highly economical.
“What is the performance of the HyDAF dissolved air flotation system in terms of pollutant removal?”
The treated water quality depends on the nature of the raw wastewater and the chemical process that is applied. In many industrial applications, the HyDAF dissolved air flotation system can remove over 99% of solids and grease which will result in quite significant reductions in BOD and COD. Nutrients and metals can also be removed using the HyDAF dissolved air flotation process.
“Does the HyDAF dissolved air flotation system require much power?”
Compared to the overall power requirements of a compelte wastewater treatment plant, the power demand for the actual HyDAF dissolved air flotation system is minimal. The dissolved air recycle pump draws the most power and is fitted with a motor ranging from 4 kW to 30kW depending on the size of the system.
“Can the HyDAF dissolved air flotation system system handle large solids?”
It can but large solids can cause blockages and increase the chances of sedimentation occurring. In industrial applications we normally recommend the installation of a 1 -2 mm screen be installed upstream of the HyDAF dissolved air flotation system.
“Is the HyDAF dissolved air flotation system easy to maintain?”
Yes the system can often be maintained by in-house personnel. Mechanically the HyDAF dissolved air flotation system rarely fails, the most common cause of poor performance is due to chemical programs malfunctioning which is usually due to changes in raw wastewater characteristics.