air flotation unit Articles

  • Treatment of Spent Filter Backwash Wastewater Using Dissolved Air Flotation Process

    Spent Filter Backwash Water (SWW) is a major recycle stream that accounts for 10% (about 30 mgd) of the average flow at Blue Plains Advanced Wastewater Treatment Plant (AWTP) and a similar proportion of nitrification and denitrification treatment process capacity (DCWASA Focus, November 2004). The peak SWW flow and load result from increased filter washing during high flow events. The combined ...

  • Dissolved-air flotation associated with an anaerobic reactor, as applied to sewage treatment

    This paper presents the results of a study performed with a pilot sewage treatment plant consisting of an aerobic reactor followed by a flotation unit. To coagulate the anaerobic effluent, different ferric chloride dosages were applied by adopting two approaches: applying constant dosages during the essay and varying the dosages according to the anaerobic effluent turbidity. To obtain more than ...


    By Inderscience Publishers

  • Evaluation of the effects of varying the water velocity at the entrance of the contact zone on the performance of a dissolved air flotation (DAF) unit using the image analysis method

    For a more efficient design of dissolved air flotation (DAF) units, it is important to deepen our knowledge of the role that each constituent part plays with regard to overall performance. The velocity control of the flocculated water at the entrance (Ve) of the contact zone of DAF units is important because the degree of agitation in this region may affect the size of the flocs and the ...


    By IWA Publishing

  • The design and operation of conventional and novel flotation systems on a number of impounded water types

    This paper describes the design of conventional Dissolved Air Flotation (DAF) systems, and the novel Counter Current Dissolved Air Flotation Filtration (COCODAFF®) process. The operation and performance of these plants on a variety of water types in the United Kingdom and South Africa is also described. The advantages of flotation processes for the treatment of impounded waters either high in ...


    By IWA Publishing

  • Case study – GEM vs DAF, efficiencies of GEM system over dissolved air floatation (DAF)

    Introduction Clean Water Technology, Inc., the creator of the Gas Energy System (GEM), provides the most advanced primary treatment system on the market. The GEM System provides superior reduction of total suspended solids (TSS), biological and chemical oxygen demand (BOD/COD), fats, oils and grease (FOG) and turbidity. Challenge A Frozen Food Manufacturer ...


    By Clean Water Technology, Inc.

  • FF System - Compact WWTP

    Our “FF System” is the perfect solution created by our engineers to guarantee a flexible and long lasting treatment unit which is ready use due to the fact that it is completely pre-assembled. This compact system includes all the required unit operations such as screening, dissolved air flotation, biological oxidation, sedimentation and UV disinfection. This is the best available ...


    By Panta Rei Srl

  • Pretreatment system a success for meat processor

    Recovery & removal rates doubled with the AIRE-O2 MICROFLOAT® Problem This Midwest USA red meat processor faced rapidly rising surcharges from the municipal wastewater treatment plant that received the processor’s wastewater. City authorities encouraged the processor to help fund an expansion of the treatment plant’s capacity, an option the processor wanted to avoid. A successful ...

  • Case study - Meat processors create new product with treatment

    The Aire-O2® Microfloat’s immediate impact was a $100/day chemical savings Problem A southern USA red meat processor’s wastewater treatment was getting more complex and expensive but still did not yield the expected results. Regulations were getting stricter and ...

  • Meat processor creates new product with treatment case study

    The AIRE-O2 MICROFLOAT®’s immediate impact was a $100/day chemical savings Problem A southern, USA red meat processor’s wastewater treatment was getting more complex and expensive but still did not yield the expected results. Regulations were getting stricter and stricter as well. The processor was spending US $192 per day on ferric chloride to promote coagulation ...

  • Treatment Of High Strength Chemical Industry Wastewater Using Moving Bed Biofilm Reactor (MBBR) and Powdered Activated Carbon (PAC) Technology

    A new Waste Recycling Facility (WRF) was created at the Sasol coal to liquids facility in Secunda, South Africa with a wastewater treatment system that includes equipment to treat the wastewater and storm water through several steps including equalization, oil removal (gravity separation and dissolved air flotation), lime neutralization/metals precipitation, back-neutralization, fixed-film ...

  • Meat Packer

    Problem: When it was time for a meat packer in Canada to upgrade their dissolved air flotation system, they considered a number of possible replacements. Besides solving their wastewater needs, they needed a unit that would take up little of their valuable space and one that would be also economical to use. Solution: Allowing the company to first screen ...


    By HydroCal Inc.

  • Adapter bacteria control oil spill in bulk

    Introduction Microbac was called in to advise on a required treatment for an integrated bulk oil handling facility and sea-land terminal, receiving, storing and shipping a wide variety of liquid fuels, inorganic chemicals and petrochemicals, many of which are toxic to microorganisms. The variable and complex waste streams from tank truck cleaning, ballast and tank cleaning discharges from ...


    By Microbac Ltd

  • Northwest’s Hood River Juice Company Hood River, OR case study

    The Problem: Hood River Juice was building a new process facility and needed to construct a wastewater treatment plant to meet their surcharge requirements for BOD and TSS. The goals and objectives were to minimize operator attention and achieve results that were sustainable. The Solution: BioprocessH2O provided a bioFAS Mobilized ...


    By BioprocessH2O

  • Case study – military

    Introduction In 2009, a West Coast Military Air Base contacted CWT to bid on a plane washing wastewater treatment facility. The military needed to upgrade and replace their antiquated dissolved air flotation (DAF) unit to meet more stringent discharge requirements and attain higher contaminant reductions. Being a Federal Base, it was imperative for the military to have the best wastewater ...


    By Clean Water Technology, Inc.

  • Wastewater-Primary Treatment

    Primary Treatment is defined as a wastewater treatment process that takes place in a rectangular or circular tank and allows those substances in wastewater that readily settle or float to be separated from the water being treated. This process achieves solids separation. The solids readily available to settle to achieve sedimentation will do so in a settling tank referred as a clarifier. On the ...

  • Case study – Gem-D series

    Introduction Clean Water Technology, Inc., the creator of the Gas Energy Mixing (GEM) System, introduces their newest in technology The GEM - D Series for municipal water and wastewater applications. The GEM-D Series is a hybrid dissolved air – flotation system. What makes the GEM-D Series better than the rest? Introduction of air through Liquid Solid Gas ...


    By Clean Water Technology, Inc.

  • Case study - rendering retrofit

    Challenge A prominent rendering facility in the southeastern United States was faced with loadings that were too high for the existing dissolved air flotation (DAF) unit. To minimize the amount of carry-over into their secondary system, they were forced to run at a very slow rate. Still, too many solids were being discharged from the existing DAF into the anaerobic pond. The ...


    By Clean Water Technology, Inc.

  • Quietly Saving 425 HP on Five DAFS

    Great Lakes Pulp & Fibre, Menominee, Michigan, USA invited World Water Works to demonstrate the ability to reduce operational costs associated with two Poseidon dissolved air flotation systems (DAFs). The mill stipulated that the performance of the DAFs must not be negatively affected by any operational cost reductions. The inefficiency of the existing air dissolving technology presented the area ...


    By World Water Works, Inc.

  • A Pilot Study of Mercury Liberation and Capture from Coal-Fired Power Plant Fly Ash

    The coal-fired electric utility generation industry has been identified as the largest anthropogenic source of mercury (Hg) emissions in the United States. One of the promising techniques for Hg removal from flue gas is activated carbon injection (ACI). The aim of ...

  • Dog Food Processor Wastewater Case Study

    Pet Food Industry Wastewater Treatment Dog Food Processor A dog food processing facility was using ferric chloride and an anionic polymer to treat their wastewater using an Air Sparged Hydrocyclone ...


    By Integrated Engineers Inc.

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