CDFU Cyclonic Flotation: Where Ultrafine Bubbles Beat a Bigger Tank

2026-11-10

Conventional flotation is limited by the tank it needs, because residence time substitutes for collision efficiency. The CDFU takes the opposite route, using a cyclonic field and ultrafine bubbles to raise the probability that a bubble meets a droplet, an

CDOF in Refractory Wastewater: Ozone Catalysis Coupled With Flotation

2026-11-10

Ozone oxidation and flotation solve different halves of the same problem, and building them in one vessel changes what each can do. This note explains how catalytic ozone converts a selective oxidant into hydroxyl radicals, why the flotation stage handles

Four Secondary Clarifier Faults and the Operating Levers That Fix Them

2026-11-10

Rising solids, low dissolved oxygen, floating sludge and black sludge rising in blocks all appear in the same tank, and several of them share a single cause: sludge held too long. This note takes each presentation in turn, pairs it with the specific mecha

Why Total Nitrogen Misses Its Limit: Nine Causes and the Carbon Behind Them

2026-11-10

Nitrification only converts ammonia, so a plant can nitrify perfectly and still fail on total nitrogen, and most of the reasons are design errors rather than biological ones. This note sets out the nine common causes, the dissolved oxygen and carbon thres

Winter Operation of a Biological Plant: Temperature, Sludge Age and Bulking

2026-11-10

Cold weather brings colder water, a heavier load and slower biology at the same time, and the slow biology is the part nobody sees until the ammonia number moves. This note sets out the winter discipline for a biological plant, covering nitrogen removal t

Valveless Filters: Siphon Hydraulics, Bed Depth and Commissioning Checks

2026-11-10

A valveless filter replaces every valve with the hydraulics of a siphon, which makes it almost unattended but also removes any way of responding to a variable load. This walk-through covers the filtration and backwash cycle, the media and bed-depth rules

Diatomite as Filter Media and Adsorbent: The Properties That Decide Performance

2026-11-10

Diatomite is a fossil silica skeleton with an unusual combination of high porosity, low density and chemical inertness, which is why it serves both as a filter aid and as an adsorbent in water treatment. This note reads the physical data as a set, explain

Judging Biodegradability: Five Test Methods and What Each One Misses

2026-11-10

Whether a wastewater can be treated biologically is decided by how much of its organic load is degradable and how fast, and the usual BOD5/COD ratio answers neither question cleanly. This review compares ratio indices, respiration curves, carbon dioxide e

Desalination Process Choice: Why MSF Holds the Gulf and RO Takes the Rest

2026-11-10

Thermal or membrane is the first decision in any desalination project, and it is settled by the price of heat, the quality of the feed and the size of the unit rather than by which process looks more advanced. This review compares MSF, multi-effect distil

MBR Design Choices: How MLSS, SRT and Membrane Flux Set Plant Cost

2026-11-10

A membrane bioreactor replaces the secondary clarifier with a membrane unit, which lets a plant hold far more solids than conventional activated sludge ever could. That single change rewrites the design rules for sludge age, tank volume, nitrification and