IWWS (Industrial Waste Water Services) engineers its Dissolved Air Flotation units to meet the specific requirements of each industry and customer. Waste water makeup, flow rate, space available, and discharge requirements are all taken into consideration when designing and recommending as system to you. The following, are common components of a complete IWWS waste treatment system.
The first component of an IWWS system is your plant process. Your operations, processes conducted, sources of wastewater, space constraints, utilities availability, discharge points and water reuse needs dictate our system design. We learn this information through on-site visits, lab testing and on-site full-scale pilot studies.
Lint, scale, sand and other large objects are removed from the waste stream via cascade screens, vibrating screens or other course screening devices. We try to use your existing equipment whenever possible. If you require screening, we can work with our equipment suppliers to supply the right equipment for your specific application.
Equalization & Surge Buffer
Because of our responsive control systems IWWS systems requires smaller EQ tanks and surge buffers upstream of the DAF unit than normally called for. When possible we will use existing collection pits or tanks for this purpose.
Physical/Chemical Treatment pH Adjustment
Accurate pH control and chemical injection is vital to any waste treatment system. Where others rely on large EQ tanks, large volumes of chemicals, and residency time, IWWS uses custom programmed control systems for precise pH adjustment. Inline adjustment of pH allows for fast response times, and reduces somewhat the need for large EQ tanks.
Chemical and Air Injection
Depending on the nature of each waste stream coagulants , flocculants and other chemicals such as metal scavengers (see patented Continuous Metals Removal system) are introduced into the multi-point injection flocculator in combination with micro-bubbles. The bubbles are produced by dissolving air or other gasses into clean effluent.
Flotation of Waste
The IWWS method of mixing chemistry, bubbles and wastewater produces large buoyant particles (floc) that rise quickly to the top of the separation tank The waste particles form a “float” on top of the tank. Skimmer paddles move the float off into the attached sludge holding tank. The clean effluent flows into an integral holding tank.
The sludge produced is minimal in an IWWS system. It may either be disposed of directly or further dewatered in a small filter press.
Discharge or Reuse
The clean effluent is ready for discharge to POTW or reuse in the plant, depending on your requirements.