Black and Odorous Water Bodies: How They Are Defined, Graded and Fixed

2026-10-19

Colour and smell are the visible end of a much simpler problem: organic load exceeding what a water body can digest. This article sets out how rural and urban black and odorous water bodies are identified, the three indicators used to grade them, and the

Hydrocyclone Design and Operation: How Geometry Sets the Cut Size

2026-10-19

A hydrocyclone has no moving parts, yet its cut size swings wildly between installations because a handful of dimensions decide almost everything. This guide walks through the internal flow patterns, the geometric parameters that matter, and the operating

Fluoride, Copper Complexes and TMAH: Where Physical Units Fit in Semiconductor Wastewater

2026-10-19

Semiconductor effluent combines fluoride, phosphate, complexed copper and high ammonia nitrogen in one pipe, and no single unit treats all four. This article maps each pollutant to the step that actually handles it, explains why complexed copper needs cha

Silicon Carbide Filtration at pH 0-14: Lifetime Matters More Than Precision Alone

2026-10-19

In strongly acidic or alkaline brine, the filtration problem is rarely accuracy; it is how long the medium survives. This article compares silicon carbide elements with stainless steel, conventional ceramic and polymeric membranes across pH range, tempera

Tank Dewatering Without Chemicals: CDFU Flotation Plus Coalescing De-Oiling

2026-10-19

Bottom water drained from a crude tank carries oil, volatile organics and heavy metals, and the conventional answers are either reagent-heavy or energy-hungry. This article walks through what tank dewatering water actually contains, why emulsion makes it

Oil in Refinery Cooling Water: Designing a Coalescing Separator That Keeps Up

2026-10-19

A refinery cooling circuit that picks up oil loses heat transfer before it loses water quality, and conventional filtration answers the problem with frequent backwashing that never quite catches up. This article explains how a pressurised coalescing separ

Ozone Pre-Treatment for Electric Desalting Wastewater: Fixing B/C Before Biology

2026-10-19

Electric desalting wastewater is not hard to treat because it is strong; it is hard to treat because the biological stage cannot use what is in it. This article explains how ozone advanced oxidation converts refractory molecules into biodegradable fragmen

Landfill Leachate at 12,000 mg/L COD: Where Heterogeneous Ozone Catalysis Fits

2026-10-19

Leachate defeats membrane trains with concentrate and defeats Fenton with iron sludge. This article examines heterogeneous ozone catalytic oxidation as a third option, compares its retention time, chemical consumption, secondary waste and cost per tonne a

CFU Compact Flotation in 90 Seconds: A Parameter-by-Parameter Reality Check

2026-10-19

A conventional air flotation unit needs ten to fifteen minutes of residence time to do what a compact flotation unit does in ninety seconds. This article walks through the parameter table item by item, from bubble generation and particle size to footprint

Homogeneous and Heterogeneous Catalysis in One Train: What Changes for Refractory COD

2026-10-19

Most catalytic oxidation projects choose between a homogeneous system that reacts fast but is hard to recover, and a heterogeneous system that is easy to handle but slower. This article examines a combined multi-stage arrangement, explains how each cataly