Coarse-Graining Plus Shallow-Tank Theory: The Engineering Logic Behind the Coalescing Pressure Deoiler

2026-10-22

The coalescing pressure deoiler strips suspended oil and fine solids from oily liquids under pressure, serving petrochemical, metallurgical, textile and food plants alike. This piece walks through its three-zone tank layout, the coarse-graining capture of

Physical, Chemical or Biological? Matching the Right Separation Route to Emulsified Oily Wastewater

2026-10-22

Emulsified oily wastewater resists ordinary settling, so plants must pick between physical, chemical and biological separation routes. This review compares the three families on separation speed, capital and O&M burden, environmental footprint and long-te

Electrocatalytic Oxidation Among the AOPs: Radical Chemistry, Two Equations and a Cost Figure

2026-10-21

Advanced oxidation processes were proposed in 1987 to solve what direct oxidation could not, and electrocatalytic oxidation is one of the cleanest forms. This article explains why hydroxyl radicals react roughly five orders of magnitude faster than ozone,

When Gravity Separation Runs Out of Gravity: Adding CFU and CDFU to an Offshore Platform

2026-10-21

An offshore platform combining hydrocyclones with an oil-water separation tank has a built-in expiry date: as crude API gravity falls and viscosity rises, gravity and centrifugal separation lose effectiveness. This article explains how that threshold arri

Conventional DAF or CDFU? A Side-by-Side Comparison Backed by Five Operating Cases

2026-10-21

Two systems both called flotation can differ by a factor of eight in retention time and by a factor of ten in energy use. This comparison sets conventional dissolved air flotation against the CDFU cyclonic dissolved gas flotation unit across retention tim

Filter Media and Contact Media Compared: Honeycomb, Soft Fibre, Quartz Sand, Carbon and Cloth

2026-10-21

The contact medium decides whether a biological aerated filter works at all, and the choice is often made from a catalogue rather than from failure modes. This article reviews what goes wrong with FRP honeycomb, soft fibre and irregular granular media, th

Choosing a Flocculant: Inorganic, Organic or Microbial, and the Two Traps That Catch Most Operators

2026-10-21

Flocculant selection is usually settled by price per kilogram, which is why so many plants end up dosing more than they need. This article follows the charge-neutralisation and bridging mechanisms from first principles, compares inorganic polymer, organic

CDFU Cyclonic Dissolved Air Flotation: Performance Figures and the Key Variables That Move Them

2026-10-21

Gravity separation, standalone dissolved air flotation and biological treatment each leave a gap on emulsified and dissolved oil, shock loads and cycle time. The CDFU process closes part of that gap by combining cyclonic shear with fine-bubble adsorption.

Inside the CDOF Unit: Ejector, Reactor, Catalyst and Off-Gas, Stage by Stage

2026-10-21

Ozone utilisation is where catalytic ozonation systems are won or lost, and most of the loss happens in four places: dosing, contact, catalysis and the tail gas. This article walks through the CDOF unit stage by stage, from the ejector that shatters ozone

Surface Aeration Explained: Three Actions Behind Oxygen Transfer, and Where the Approach Stops Paying Off

2026-10-21

A surface aerator looks like the simplest piece of equipment in a treatment plant: a motor, a shaft, an impeller and a float. The oxygen it delivers comes from three distinct hydraulic actions, and those actions also define its limits. This article separa