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AquaFloc sedimentation systems

Water Maid AquaFloc removes heavy particle loads from the water

In line with Mellifiq’s complete process approach, our Water Maid AquaFloc series of particle separation systems provides simple and effective particle and sludge separation in a modular configuration. Our particle removal systems have been developed specifically for situations where our clients are in need of temporary or permanent solutions to comply with tough environmental restrictions pertaining to suspended solids, heavy metals or recalcitrant groundwater pollutants.

The WaterMaid AquaFloc series offers flexible installation at any outdoor location or as a pretreatment step for advanced water treatment processes in industrial settings for COD and BOD removal and emerging micropollutants like PFC, PFOS and PFAS.

Flexibility and easy installation

The AquaFloc series of water treatment systems make water treatment simple for everyone, and Mellifiq will be there to make it effortless. Mellifiq offers the full services including configuration to adapt to your needs, positioning on site, commissioning and full operational services to achieve maximum uptime.

The AquaFloc series can be placed in any normal outdoors conditions, making it a perfect choice for long-term ground water remediation projects, temporary installations at construction sites, but also as very effective particle removal systems in combination with Mellifiq’s Water Maid FlexKarb systems, the Ozonetech systems, and the Saniray advanced oxidation systems.

Operational principle and design

In the WaterMaid AquaFloc systems, the fundamental operational principle for separating and treating water with high particle loads relies on multi-compartment plug-flow processes. When it comes to removing the suspended solids, flocculation chemicals are normally used together with high-intensity agitation to mix flocculants with solids, enabling a coalescing effect. It is important to ensure sufficient mixing effect and to avoid any short-circuiting of the feed water. Once flocs are formed, a settling process occurs without any mixing, which separates clear, treated water from a layer of non-suspended solids.

Several additions and modifications can be made to this process to treat heavy metals and nutrients. Possibilities include using an additional mixing compartment or connecting several Water Maid AquaFloc units to each other. Low intensity mixing zones can also be incorporated to create a uniform floc liquour that separates particles by Dissolved Air Flotation (DAF) or Dissolved Ozone Flotation (DOF).

Water Maid Aquafloc being used for groundwater treatment

Mixing zone

Regardless of potential treatment compartments, particle separation starts with homogenously mixing untreated feed water with flocculants in order to enable separation by gravity. This drastically decreases the required retention time and installed footprint compared to relying solely on the natural settling properties of most suspended solids. Efficient mixing requires careful sizing of mixing intensity and thrust. Adjustment of pH levels to optimize the floc-forming properties of flocculants may be required in this stage depending on the water properties and flocculant type.

Secondary mixing zone

For projects where multiple species contained within the matrix exist, pH levels may need to be adjusted further in order to create the right conditions for dissolved pollutants, such as heavy metals including, but not limited to, zink, chrome and copper. These are commonly found in groundwater infiltration areas.

Floc suspension zone

In special projects, WaterMaid Aqueduct systems can be tailored to include a zone where you can suspend the formed flocs for a prolonged period of time. This may be suitable in situations where it is not possible to dispose of settled particles at the drain, or where various types of dissolved air flotation must be implemented to recover the flocs through an integrated weir. In order to not disrupt the formed flocs, low speed mixing is required.

Settling

After particle flocs have been created in the upstream mixing zone, they must be allowed to settle. It is therefore vital to maintain an even flow distribution through the settling zone. Settling is achieved by increasing the specific gravity of the agglomerated particles, meaning they have a higher floc density compared to the liquid. Therefore, settling rates heavily depend on proper process design and sizing, including stable and suitable pH levels adapted to the water quality.

Discharge weir

Treated water from the settling zone is collected at a small discharge compartment to allow for even effluent flows from a discharge weir.

Operational data and standard configurations

Type Active volume (m3) Capacity (m3/h)* Number of active zones Mixer types Power use (kW)** Size (LxWxH, m)*** Download
AquaFloc-24-S 24 15 2 High-speed vertical agitator 0.85 6.3×2.6×2.6 Product sheet
AquaFloc-24-M 24 12 3 High-speed vertical agitator and low-speed mixer 1.1 6.3×2.6×2.6 Product sheet
AquaFloc-30-S 30 20 2 High-speed vertical agitator 0.95 6.3×2.6×4.4 Product sheet
AquaFloc-30-M 30 16 3 High-speed vertical agitator and low-speed mixer 1.2 6.3×2.6×4.4 Product sheet

 

 

*Nominal flow for 100 mg/L SS with focculant
**Includes agitators, pH dosing system at nominal conditions
***Does not include external components such as hoses or dosing systems

Commissioning and start-up services

Mellifiq delivers all required services to ensure a smooth handover process. These services include mounting, testing and controlling. We also assist in preparing the site before the physical delivery arrives, including any ground surface preparations and ground leveling. All electrical work is normally prepared in cooperation with the site engineers during the handover process.

On-site tests (SAT)

All integrated equipment—such as chemical sensors, dosing pumps and mixers—are controlled thoroughly during commissioning. In this image, we are testing high-intensity mixing in the flocculation zone. Upon request, we develop an extensive testing plan to assure that the water quality meets relevant local, regional or national standards. We also perform sampling and draft reports.

Accessories and auxiliary equipment

Type Purpose Description
High speed mixer Flocculation mixing with incoming feed water (standard) Max 1150 rpm, 0.75 kW 3-phase 220/400V 50/60Hz
Low speed mixer Floc suspension zone mixer (optional) Max 100 rpm, 0.25 kW 3-phase 220/400 50/60Hz with gearbox
pH dosing station Active pH control of water in mixing or floc suspension zones (standard) PID controller (option) or manual dosing rate (standard) with pH sensor, signal cables, industry grade dosing pump and caustic/acid container
Flocculant dosing station For dosing of flocculant for high rate sedimentation in settling ozone (standard) Manual dosing set-point, signal cables, industry grade dosing pump and chemical container
Submersible heater Heating of feed water with surbmersible heaters for cold climates or winter conditions (option) 2000W, 220V, stainless steel construction with thermostat
Submersible pump Submersible pump for effluent (option) 0.75 kW 1-phase submersible pump
Winter kit External heater kit for cold winter conditions and outdoors use to avoid freezing (option) 2-5 kW range with heater cables and thermostat
Lamella system Increased settling rates in floc settling ozone Floor lamella system 45 deg

Please contact Mellifiq to adapt and configure your WaterMaid Aqueduct system according to your needs and conditions.

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