Dissolved Air Flotation (DAF)

What is a DAF? DAF stands for Dissolved Air Flotation. A DAF unit is a type of clarifier.  But instead of gravity settling as in a traditional clarifier the DAF uses microscopic bubbles that attach to the floc and cause it to float. The standard DAF will have a surface rake that collects the floating floc from the floatation chamber into a sludge holding tank. From the sludge holding tank the sludge can be de-watered in a de-watering box, filter press or belt press. The treated water is often of sufficient quality to be discharged directly from the DAF to ... » Read More

Removing Recalcitrant COD

What is COD? COD is Chemical Oxygen Demand and is a common analytical tool to measure the strength of industrial waste water. When COD is not reduced by common industrial waste water treatment methods it is often called recalcitrant COD. Example of COD using Fenton’s Reagent An example would be industrial waste water containing Phenol. Phenol is toxic to most microorganisms and is difficult to remove. One way to remove this recalcitrant compound is by chemical oxidation using Fenton’s Reagent. Fenton’s reagent is a powerful oxidizer that is generated when Hydrogen Peroxide is in the presence of an iron catalyst. ... » Read More

Automating the Fenton Reagent Oxidizing Process

Fenton Reagent Oxidizing Process Automating the Fenton oxidizing process is easy to accomplish. The treatment process can be controlled by monitoring pH, ORP (Oxidation Reduction Potential) and Temperature. pH can be adjusted automatically by the addition of an acid or a base by means of chemical feed pump. PLC-based Control The chemical feed pump is controlled through a PLC-based control panel. The desired pH is set on the control panel and the variable speed chemical feed pump does the rest. ORP measurements are preset on the control panel to regulate the rate and amount of hydrogen peroxide being added to ... » Read More

Determining if the Fenton Process is right for your application

The Fenton Process Wilson takes a phased approach to determine if the Fenton regent is a feasible treatment method for your industrial treatment process. The first phase, Phase I, is what we call Fenton Screening where COD is measured both before and after treatment to determine percent reduction and give an estimate of chemical cost. If the Phase 1 results are good, that is reaching the desired COD without excessive chemical addition a Phase II analysis is recommended. The phase II analysis examines chemical dosages of iron, hydrogen peroxide, lime, rise in temperature and reaction times. These parameters are the ... » Read More

Groundwater Treatment Building Mural

Ground Water Treatment Building Mural We are working on a large groundwater remediation project in Houston that is located in a residential neighborhood. The groundwater remediation control building is located in the dog run of an upscale apartment complex. Last month the apartment manager hired Salcreations, a local muralist to paint the building. Boy, were we surprised when we saw this. It’s really good-looking.

Biological Treatment Feasibility

Assessing Aerobic Biological Treatment for Industrial Applications To determine the feasibility of your waste water being treated using aerobic (with oxygen) biological treatment is a two-phase process. Phase I is to perform wastewater characterization and an aerobic treat-ability assessment screening study. Phase I is a low- cost assessment that will answer the question, will aerobic biological treatment work on this waste water stream. Based on the estimated volume and type of waste water a decision can also be made whether or not to consider anaerobic (no oxygen) treatment. If Phase I results are favorable a Phase II study should follow. ... » Read More

Waste Water Treatment, Using Fenton’s Reagent for Chemical Oxidation

The Fenton reagent is produced when a solution of hydrogen peroxide is mixed with dissolved ferrous iron. The ferrous iron acts as a catalyst to produce a hydroxyl radical. The hydroxyl radical generated in the Fenton Process is a strong oxidizer that is second only to Fluorine in its oxidizing strength. It has approximately twice the oxidizing strength of hydrogen peroxide alone. Fenton’s reagent is used to oxidize organic contaminates found in industrial waste waters. Fenton’s reagent is most commonly used to destroy organic compounds that are resistant to other wastewater treatment techniques such as biological treatment or carbon adsorption. ... » Read More

Waste Water Treatment, Design and Build vs. Standard Vendor Unit

Waste water treatment technology is not new. The individual components that make up a complete system are readily available. Standard Vendor Unit As a rule of thumb vendor units are usually designed for flow rates up to 30 gallons per minute (GPM). Vendors state the flow rate as 0 to 30 for a 30 gpm system. It is stated this way because as filters are used they become blocked and the flow will continuously drop off. High contaminate concentrations will also reduce the amount of waste water that the system is able to treat. Design and Build For high contaminate ... » Read More

dewatering box caking

Solving Sludge De-Watering Box Problems – Cake removal

De-watering Box Cake Removal One problem that can occur when using a de-watering box with a dense sludge is that after drying, the dried material or cake, can stick inside the de-watering box. Filter Cloth is a Simple Solution A simple solution to this is to line the de-watering box with a filter cloth. When you dump the hopper, just throw the filter cloth away along with the cake and start over. An inexpensive Poly Ethylene or Rayon filter cloth works well for this situation. Filter cloth can be purchased in rolls up to six feet in width. A typical ... » Read More

Sludge Conditioning to Aid Sludge De-Watering

Most sludge de-watering applications will benefit from sludge conditioning ahead of the thickening or de-watering device. Coagulants and flocculants, polymers, are widely used in many industries to remove water from wet solids (sludge). Note that flocculants alone are often all that is required to improve sludge de-watering. This process is known as sludge conditioning. Water release from sludge is affected by electrostatic forces of attraction and repulsion that control floc formation and size. Floc size and uniformity controls the flow of water through the sludge under gravity (de-watering boxes), or under pressure (belt presses and plate and frame filter presses). ... » Read More