Why Heavy-Oil Tank Draining Resists Conventional Flotation, and How a Two-Stage CDFU Train Fixes It

2026-09-20

Tank draining at heavy-oil depots produces a stable oil-in-water emulsion that gravity separation and ordinary flotation cannot break. This article explains why SINOKLE split the duty across two CDFU stages plus an activated-media filter, and what that ch

Heavy Fuel Oil Tank Cleaning Wastewater: Why One Separator Cannot Clear GB 8978-1996

2026-09-18

Tank-farm cleaning water carries oil, COD and BOD at once, and simple oil separation addresses only part of one of them. A three-stage route of CDFU, coalescing fibre recovery and CDOF catalytic ozone oxidation works through the problem in gradients.

Sulphides in Wastewater: Why the Chemistry Behind H2S Matters for Treatment Decisions

2026-09-18

Sulphides are reducing, alkaline in solution, toxic when acidified and aggressive towards metals. Understanding the hydrolysis, redox and precipitation chemistry explains most of the odour, corrosion and dosing problems they cause in collection systems an

Dissolved Air Flotation Design: The Parameters That Decide Whether a DAF Tank Performs

2026-09-18

Most underperforming DAF units are not badly built, they are badly set. This article sets out the pressure, reflux and loading ranges that govern performance, the streams DAF handles well, and the conditions where it should not be specified at all.

Biofilm Reactors: Why Attached Growth Still Beats Suspended Growth for Small Plants

2026-09-18

Attached-growth treatment keeps a microbial population the hydraulic flow cannot wash out. This article works through biofilm structure, maturation, thickness control and the main reactor formats, and explains where biofilm outperforms activated sludge.

MBR at Fifty: What Membrane Bioreactors Actually Changed in Wastewater Practice

2026-09-18

Replacing the secondary clarifier with a membrane looks like a small change and turned out to be a large one. This review covers MBR configurations, the energy penalty nobody escapes, and the high-strength industrial duties where retention pays for itself

Iron or Aluminium? How Coagulant Chemistry and Jar-Test Discipline Decide Oily Wastewater Performance

2026-09-18

Choosing between iron-based and aluminium-based coagulants is rarely decided by the datasheet. This article compares PFS, PAC and the composite salts, then walks through the jar-test protocol and storage conditions that determine whether any of them perfo

When Water Cut Passes 90%: Rethinking Surface Separation for Mature Onshore Oilfields

2026-09-18

Composite water cut above 90% has changed what oilfield surface facilities must do. Gravity settling and heavy chemical dosing are losing ground to compact pure-physical separation that cuts retention time, footprint and O&M exposure at the same time.

From Emulsified Oil to Marine Discharge Limits: Combining CDFU, KHC, CDOF and KFM by Objective

2026-09-18

Water quality decides the treatment sequence. This article maps five common objectives - heavy emulsification, extreme oil concentration, composite oilfield pollution, terminal polishing and COD-driven limits - onto the SINOKLE module combinations that an

Cutting Chemicals Out of Oilfield Condensate Water: What a CDFU and SFM Physical Train Changes

2026-09-18

Chemical dosing has been the default for oilfield condensate-water deoiling for decades. A pure-physical CDFU plus SFM route removes the dosing step entirely, cutting sludge, O&M workload and energy use while keeping separation stable under fluctuating fe