TECHNOLOGIES, INC.           The Art and Science... of Wastewater Treatment

A "Green" company
 since 1990



Chemical Reaction Systems

pH adjustment, neutralization, precipitation and specialty chemical reaction systems


Inclined Plate (IPC) Clarifiers

Control Panels

World class PLC and relay logic based panels

DAF (dissolved air flotation) Flotation Systems

Traditional and lamella plate dissolved air flotation (DAF) systems

Media Filters

Sand (deep bed and high rate), multi-media and specialty filters

Media Packs

Media Packs for oil / water (immiscible liquids), DAF, sedimentation and custom separation systems

Oil Water Separators

API, enhanced gravity and pressurized separators suitable for any application

Packaged Systems

Pre-packaged turnkey systems for hundreds of applications

Pump Packages

Centrifugal, positive displacement and progressive cavity pump packages


About Us

Company Profile

Customer List

Contact Us

Phone, E-mail, Fax, Etc...

Continuous Flow Flash Mix and Flocculation Systems

Flash mix and flocculation refer to the process by which fine particulates are caused to clump together into larger "flocculated" particles. The floc may then float to the top of the liquid, settle to the bottom of the liquid or, depending on it's characteristics, remain suspended.  Depending on the results, the solids can be separated by the use of a sedimentation clarifier, a flotation system or filtration system.

Flocculation is widely used and applicable in sewage treatment systems, stormwater treatment and treatment of other industrial wastewater streams, as well as purification of drinking water.

The Hydro-Flo continuous flow flash mix and flocculation systems are typically used after a single or multi stage chemical reaction system.  Our flash floc systems are designed to achieve two goals.

First, in the flash chamber, the injected polymer will be vigorously mixed with the process or wastewater to insure complete dispersion throughout the entire stream.  This will improve overall contact between the flocculent and the wastewater, improving treatment quality and reducing overall chemical consumption.

Second, the floc tank gently mixes the contents, allowing the flocculated particles to grow in both volume and mass, allowing easy removal by downstream clarification equipment (sedimentation or floatation).

The addition of polymers to a water treatment system is a basic process, but there are many finer points to consider in order to reduce chemical consumption and maximize overall treatment results.

Why Choose
Hydro-Flo Technologies




Engineering Tools

Typical Applications

Follow this link to our library of application P&ID's and process descriptions

Application Questionnaire

Follow this link to our equipment application questionnaire

Clarifier Sizing information

Inclined Plate Clarifier Design Parameters
Detailed information on the design and sizing of inclined plate clarifiers and clarification systems

Dissolved Air Flotation System Design & Sizing information

Dissolved Air Flotation Design Parameters
Detailed information on the design and sizing of dissolved air flotation separators and separation systems

Oil Water Separator Design & Sizing information

Oil Water Separator Design Parameters
Detailed information on the design and sizing of oil water separators and separation systems

Misc Info, Data, Spreadsheets & Calculations

EPA Non-Polar Oil Test Methods

Fluid Mechanics

Reynolds Number Calculations

Water Hammer Calculations

HFT Quality Control

HFT Quality Assurance Plan

Steel Fabrications

Leak Test Certification

Interior Coatings

Exterior Coatings

Control Panels

Chemical / Material Compatibility Data

Chemical Pump Dosing Rates

Chemical Compatibility Chart

Properties of Plastic

Coating / Materials Data

Surface Prep Definitions

Standard Internal Coating

Standard External Base Coating

Standard External Top Coating

FRP Resin Cut Sheets

Gel Coat Cut Sheet

Standard Features:

  • Skid mounted

  • Stand alone operation
  • Compact design for small footprint
  • Epoxy coated ASTM A-36 carbon steel skid
  • Factory tested
  • Pre-piped
  • Pre-wired
  • Seamlessly integrates with other Hydro-Flo offered wastewater products
  • State of the art NEMA-4X, UL 508 electrical enclosure
  • Standard units can be manufactured to treat batches from 50 to 10,000 gallons
  • TEFC motors

Available Options:

  • Access platforms with ladder or stairs

  • Available in epoxy coated carbon steel, stainless steel, polypropylene, FRP, exotic alloys and all thermoplastics for long life and superior corrosion resistance
  • Duplex systems for redundancy
  • Effluent monitoring
  • Effluent sampling
  • Explosion-proof design
  • Influent equalization
  • Influent / effluent lift stations
  • On board reagent storage (day tanks)
  • Potable water design
  • SCADA system monitoring
Equipment Design Data & Sizing Calculations

Chemical Pump Dosing

Chemical Compatibility

Application Questionnaire


General Arrangement

Standard Process and
  Instrumentation Diagram


Standard Engineering

"Common" Engineering
  Applicable to all Hydro-Flo
  Manufactured Equipment

Installation, Operation & Maintenance Manuals

Standard IO&M Manual

General IO&M
  Applicable to all Hydro-Flo
  Manufactured Equipment

Process Description

The flash chamber is designed to promote complete dispersion of the injected polymer throughout the chamber.  Complete dispersion assures intimate contact of the polymer with the small coagulated particles.  Performing this basic process will improve overall treatment quality and reduce overall chemical consumption.

The flocculation tank gently mixes the contents, allowing the flocculated particles to grow in both volume and mass, allowing easy removal by downstream clarification equipment (sedimentation or floatation).

The Equipment:

The basic system is comprised of a dual compartment flash mix flocculation tank, a flash mixer, a variable speed floc mixer, a polymer injection system (featuring either an automatic poly makeup system or a manual day tank setup), and a control panel.


A steel skid is provided for supporting the entire system. The skid  features a welded 4" steel "C" channel frame, and a 1/4" steel deck plate. The entire skid is blasted to an SSPC-SP6, and coated with a 2 part self priming epoxy finish for corrosion resistance. The skid color is OSHA Safety Blue, unless otherwise specified.

Optional Containment Pan: As an option, a containment / drip pan can be provided for protecting the steel skid from leaking or spilled corrosive fluids. A drain connection is provided for plumbing the containment pan to a suitable location. The pan can be fabricated from polypropylene, stainless steel, etc. and features 8" high walls.

The Reaction Tank:

When designing the reaction tank, size and materials of construction are the primary consideration. 

Typically, the tanks are sized for approximately 30 seconds of flash mix capacity and 3 minutes of floc residence time.  These basic guidelines will vary based on the chemistry employed at your facility.

Material of construction is typically epoxy coated carbon steel, but we can fabricate the system from any commercially available material including polypropylene, stainless steel, FRP, exotic alloys and all thermoplastics.

Hydro-Flo addresses these items, as well as others, in order to properly size the system and choose the correct materials of construction for the application.

Reagent Storage Tanks:

Chemicals for treatment are pumped directly from 55 gallon DOT drums.  An alternate to pumping directly from DOT drums is utilization of day tanks, which can be automatically refilled from the customer's bulk chemical delivery system within the plant. Redundant level sensors and redundant fill valves provide protection against overfilling.


All ball valves are true union, field serviceable valves. All diaphragm valves are flange mounted.  Elastomers are EPDM and Teflon, except on concentrated acid lines where the elastomers are Viton and / or Teflon.


All recirculation, transfer and discharge lines are fabricated from solvent welded, PVC SCH 80 pipe. All reagent delivery lines are flexible, PFA tube double contained within a clear  flexible PVC hose, clamped at each end to seal leaks.

The Mixers:

The mixers are one of the key elements of the system.  The system will not generate consistent results without properly designed mixers.

The flash mixer is typically a direct drive, continuous output device, but variable speed can be included as an option.

The floc mixer is typically a gear reduced, low RPM variable speed device.

Chemical Metering Pumps:

Properly sizing the chemical metering pumps is important in order to achieve the correct chemical reactions.  Also, metering pump sizing has an impact on total chemical consumption.  Properly sized pumps will help you reduce overall chemical costs.

Control Package:

Control packages (depending on your specific requirements) are available in either basic relay logic controls, or a full state of the art PLC with touch screen HMI and our sophisticated treatment algorithms. The relay logic controls package allows 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. We can include a variety of options including digital data logging of critical process parameters, ethernet access to process data, communication with Building Management Systems, and even remote system access using cellular wireless technology.

All enclosures are NEMA 4X.  Where metallic enclosures are used, they are provided with epoxy or polyester finishes for corrosion resistance. All conduit is plastic coated, where possible. Low voltage 24VDC is used throughout to minimize service personnel exposure to high voltage. All panels are OSHA LOTO and NFPA 79 compliant. UL-508 listing is available.

System Packaging:

The system is supplied as a completely fabricated "turnkey" package. All devices are pre-wired and plumbed.

You need to make the plumbing connections to and from the system and a single electrical connection point for incoming power.  The disconnect on the MCP provides OSHA Lock Out / Tag Out and NFPA 79 compliance. LSystems requiring compressed air, also require only one connection  and the valve is supplied for OSHA LOTO.

Additional Information

For specific equipment information, contact us directly. We can provide the specifying engineer with a formatted specification package that thoroughly describes any of our systems for bidding purposes. This includes detailed drawings, and detailed equipment specifications.

Wastewater Treatment Equipment