Dropping the Secondary Clarifier: What an MBR Buys You and What It Costs

2026-09-21

An MBR is one substitution - membrane modules where the secondary clarifier used to be - and a long list of consequences. This article covers MLSS and SRT separation, configurations from immersed to anaerobic to MABR, what actually drives fouling, and whe

An Uzbek Refinery Side-Stream at 17000 m3/d: What Coalescing Deoiling Really Proves

2026-09-21

A refinery circulating water system eats more than 40% of auxiliary power, and oil in that loop destroys heat transfer. This piece compares gravity, flotation and chemical demulsification against purely physical coalescing separation, and reads the 17000

Six Figures of Oil Going In and Under 100mg/L Coming Out: A Coking Sour Water Line

2026-09-21

Coking sour water carries oil in the hundred-thousand mg/L range and emulsifies like sesame paste. This article explains why gravity and DAF trains fail on it, and how SINOKLE strings a coarse filter, CDFU cyclonic flotation, fine filter and KHC coalescer

Eight Waste Streams Behind One Dye House Outlet, and How They Are Actually Treated

2026-09-21

A dye house has one discharge point and eight different wastewaters behind it. This article breaks down each stream, explains why coagulation followed by biology remains the workhorse route, and shows where AFF and MBFB fit when a mill wants reuse rather

What a City Flushes Away: Load, Pathogens and the Process Choices That Follow

2026-09-21

Domestic sewage is a chemical problem and a microbiological one at the same time. This article works through the per-capita load, why pathogens survive secondary treatment and chlorination, and which process families actually fit municipal and small-town

No Secondary Clarifier, No Sludge Bulking: What a Biological Aerated Filter Changes

2026-09-21

A biological aerated filter combines oxidation and solids retention in one shell, deleting the secondary clarifier. This article covers the inlet SS limit that trips projects up, how BIOSTYR, BIOFOR and BIOSMEDI differ in media and backwash, and where BAF

Black Liquor, White Water and the Reuse Ceiling in a Paper Mill

2026-09-21

A paper mill has two very different wastewaters and one reuse ceiling. This article separates pulping black liquor from machine white water, looks at magnetic separation pilot data, and shows why AFF filtration followed by MBFB is the combination that act

Breaking the B/C Barrier: How CDOF Catalytic Ozonation Re-Opens Biodegradability

2026-09-21

Refractory organic wastewater poisons the biology it is supposed to feed. This article explains how CDOF catalytic ozonation generates hydroxyl radicals at 2.80V, opens ring structures, lifts the B/C ratio from 0.1~0.2 toward 0.4 and above, and where it p

Reading a Water Body by Its Oxygen: From Winkler Titration to BOD5 and COD

2026-09-21

Dissolved oxygen is the single number that tells you most about a receiving water. This guide covers what controls it, how the Winkler titration is run and where it goes wrong, how membrane probes differ, and how BOD5, BOD20 and COD each describe a differ

Where the Pollution in an Electroplating Line Actually Comes From: A Stream-by-Stream Breakdown

2026-09-21

Electroplating plants rarely fail on one bad stream; they fail because eight or nine chemically different drains are mixed into one header. This piece traces each stream back to its process step, then walks through flotation, ion exchange, electrolysis, e