Water treatment systems & equipment, explained by engineers

• What Is a DAF System? How Dissolved Air Flotation Works
• How to Size a DAF System: A Step-by-Step Engineering Guide
• High-Rate DAF Design: Hydraulic Loading, Rise Rate and Footprint
• Air Solubility and Henry's Law: The Physics Behind DAF
• The Air-to-Solids Ratio in DAF Design, From First Principles
• DAF Bubble Dynamics and Bubble-Particle Attachment
• DAF Energy Consumption and Optimisation: Where the Power Goes
• DAF Float Sludge Handling: Skimmings, Solids and Volumes
• DAF Jar and Float Testing: The Bench-to-Pilot Protocol That Fixes Your Design
• DAF Nozzle Design: The Pressure-Release Device That Makes the Bubbles
• DAF Recycle System Design: Recycle Ratio and Pump Sizing
• DAF Saturator Design: Engineering the Air-Dissolution System
• DAF Tank Design: Hydraulics and Internal Zone Sizing
• DAF vs Sedimentation: Choosing the Right Solid-Liquid Separator

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• Membrane Bioreactor Design: Flux, MLSS and Aeration Energy
• MBR vs MBBR: Which Wastewater System Is Best?
• Anaerobic Membrane Bioreactors: Energy Balance, Dissolved Methane and Honest Design Limits
• Membrane Transport Theory: The Solution-Diffusion Model, Concentration Polarisation and the Thermodynamic Limit
• Membrane Fouling and Cleaning: Diagnosis, CIP Chemistry and Protocol Design
• The Role of Extracellular Polymeric Substances in Membrane Fouling: A Colloidal and Interfacial Science Approach
• Ultrafiltration Membrane System Design: Flux, TMP and Sizing
• Nanofiltration Water Treatment: How the Membrane Selects Ions
• Reverse Osmosis System Design: A Rigorous Engineering Guide
• Forward Osmosis: How the Osmotically-Driven Membrane Process Works
• Membrane Distillation for High-Salinity Brine Concentration
• Electrodialysis and EDR: How Ion Transport Demineralises Water
• Seawater Desalination: Thermal vs Membrane and the Energy Physics

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• Activated Sludge Process Design: A Kinetic Approach
• Activated Sludge Modelling: ASM1, ASM2d and ASM3 Structure, Calibration and Use
• Anammox Kinetics at Low Temperature: Modelling the Arrhenius Correction for Northern European Works
• The Microbiome of Anaerobic Ammonium Oxidation: Metagenomic Insights into Brocadia and Kuenenia
• MBBR Design: Sizing on Protected Biofilm Surface Area
• The Membrane Aerated Biofilm Reactor (MABR): Bubbleless Aeration Explained
• Biofilm Diffusion-Reaction Kinetics: Penetration Depth, Flux and the Design of Attached-Growth Reactors
• Sequencing Batch Reactor Design: Cycles, Volume and SRT
• Trickling Filter Design: Loading Rates, Media and Removal Models
• Rotating Biological Contactors: Process Theory and Design
• UASB Reactor Design: Granulation, Hydraulics and Sizing
• Anaerobic Digestion Fundamentals: Biochemistry, Kinetics and Reactor Design
• Anammox Deammonification: The Science of PN/A Nitrogen Removal
• Biological Nutrient Removal: The Microbiology of N and P
• Sidestream Enhanced Biological Phosphorus Removal: Fermentation Kinetics and Volatile Fatty Acid Yield
• Constructed Wetlands for Wastewater Treatment: An Engineering Guide
• Waste Stabilisation Ponds: Design, Loading and Pathogen Removal

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• Sludge Thickening Design: Solids Flux Theory and Sizing
• Sludge Dewatering Equipment: Types and How to Select
• Sludge Conditioning Polymer: Selection, Dosing and Testing
• Sludge Drying Fundamentals: Heat, Mass Transfer and Energy
• Sludge Incineration and Energy Recovery: The Combustion Balance
• Sludge Bulking and SVI: Diagnosing and Controlling Poor Settleability
• Screw Press vs Belt Press: Sludge Dewatering Compared
• Decanter Centrifuge Sludge Dewatering: Design, Sigma Theory and Operation
• Thermal Hydrolysis of Sludge: THP as Digestion Pretreatment
• Thermal Hydrolysis Pretreatment: Hydrolysis Kinetics, Biogas Yield and Dewaterability
• Resource Recovery from Sewage Sludge: Pyrolysis Biochar for Phosphorus and Metal Immobilisation
• Aerobic Sludge Digestion and ATAD: Kinetics, Oxygen Demand and Design
• Biosolids Land Application: Grades, Agronomic Rates and Metal Limits
• Struvite Phosphorus Recovery: Chemistry and Reactor Design
• The Thermodynamics of Struvite Nucleation: Supersaturation Index, pH Windows and Reactor Geometry

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• Primary Clarifier Design: Overflow Rate, Weir Loading and Depth
• Lamella Clarifier Design: Settling Theory and Sizing
• Media Filtration Design: Mechanisms, Head Loss and Backwash
• Grit Removal Systems: Settling Physics, Sizing and Selection
• Rotary Drum Screens: Operation, Selection and Sizing
• Oil and Grease Separators: Types, Sizing and Selection
• Flow Equalisation Tank Design and Sizing
• Residence Time Distribution and Tracer Testing: Measuring What a Tank Really Does

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• Coagulation and Flocculation: Colloid Science to Design
• Chemical Dosing System Design: Pumps, Sizing and Control
• Tertiary Phosphorus Removal to Below 0.1 mg/L: Dosing, Flocculation and Solids Separation
• pH Neutralisation Systems: Design, Staging and Reagent Sizing
• Electrocoagulation Water Treatment: Mechanisms and Design
• Chemical Phosphorus Removal with Metal Salts: Chemistry, Dosing and Sludge
• Activated Carbon Adsorption: Isotherms, Kinetics and Bed Design
• Granular Activated Carbon: Polanyi-Dubinin Theory and Breakthrough Prediction for Micropollutant Removal
• Ion Exchange Water Softening: Resin Chemistry, Capacity and Column Design
• Metal Adsorption on Iron Oxide: Surface Complexation and Surface Precipitation

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• Chlorination Disinfection: Chemistry, CT and Dosing
• UV Disinfection System Design: Dose, Kinetics and Reactor Sizing
• Ozonation in Water Treatment: Generation, Dose and Contactor Design
• Ozonation By-Product Formation: Bromate, N-Nitrosamines and Aldehydes in Wastewater Effluent
• The Kinetics of Hydroxyl Radical Reactions in Advanced Oxidation: Rate Constants, Scavenging and Reactor Design
• Advanced Oxidation Processes for Refractory Wastewater
• Disinfection By-Products: Formation Chemistry, UK Limits and the Control Hierarchy

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• Arsenic Removal From Water: Speciation, Oxidation and Adsorption
• Nitrate Removal From Water: Ion Exchange, Denitrification and RO
• Iron and Manganese Removal from Groundwater: The Oxidation-Filtration Approach
• Hexavalent Chromium Reduction to Cr(III): The Reduction-Precipitation Route
• Heavy Metals Removal from Wastewater to Meet Discharge Limits
• PFAS Removal from Water: GAC, Ion Exchange and RO
• GAC vs Ion Exchange for PFAS: An Engineering and Cost Comparison
• PFAS in Municipal Wastewater: Partitioning, Precursor Biotransformation and Destruction

More in Water Quality & Compliance →

• Trade Effluent Consent: What It Is & How to Get One
• Effluent Discharge Standards in the UK Explained
• Assessing a Wastewater Treatment Plant: A Structured Audit Framework
• Nutrient Neutrality and Ultra-Low Phosphorus Consents: Budgets, Chemistry and What 0.1 mg/L Really Costs
• Pollution Prevention and Spill Containment on Industrial Sites
• UK Water Industry Challenges: Storm Overflows, Nutrients, PFAS, Carbon and How Engineers Are Responding
• The UK Largest Water Treatment Works: Beckton, Mogden, Ashford Common and the Engineering of Scale
• Storm Overflow Spill Reduction: The Hydraulics, Storage Sizing and Control That Actually Cut Spills
• Hydraulic Design of Storm Tank Overflows: Weirs, Sediment and First-Flush Capture
• Sewer Network Hydraulic Modelling: The Equations, the Build, and the Verification That Makes It Defensible

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• Construction Site Dewatering and Water Treatment: UK Regulatory Compliance
• Surface Water Runoff Management on Development Sites: SuDS, NPPF and Discharge Consents
• Groundwater Remediation and Treatment: UK Regulatory Framework
• Drinking Water Safety on Construction Sites: Temporary Supply Regulations and BS 8551
• Industrial Effluent from Construction and Demolition: pH, Suspended Solids and Oil Interceptor Design

More in Construction & Site Water →

• Industrial Water Reuse: A Practical Engineering Guide
• Zero Liquid Discharge Systems: How ZLD Works
• Greywater Recycling Systems: Characterisation, Treatment and Design
• Industrial Rainwater Harvesting: Yield Modelling and Storage Sizing
• The Circular Water Economy: Cascading Reuse and Resource Recovery
• The Industrial Water Footprint: Blue, Green and Grey Water
• Net Zero in Water Treatment: Why Process Emissions, Not Electricity, Decide the Carbon Balance
• Japanese Wastewater Research: Five Sources Assessed for UK Engineers
• Bioelectrochemical Systems for Wastewater Treatment: Microbial Fuel Cells and Electrolysis Cells
• Water Resources Planning and Drought Resilience: Deployable Output, Headroom and the Supply-Demand Balance
• Cooling Water Management: Cycles of Concentration and Water Chemistry
• Digital Twins and Model Predictive Control in Water Treatment: Architecture, Mathematics and Honest Limits

More in Sustainable Water Solutions →

• Industrial Wastewater Treatment: Processes & Selection
• Wastewater Management and Environmental Impact: The Global Picture
• Brewery Wastewater Treatment: Process & Design
• Dairy Wastewater Treatment: Characterisation and Treatment Train
• Landfill Leachate Treatment: Composition, Ammonia and Treatment Trains
• Odour Control for Hydrogen Sulphide at Wastewater Works
• Microplastics in Wastewater Treatment: Fate, Transport and Removal Across the Treatment Train
• COD and BOD in Wastewater: Rigorous Definitions and Design Use
• Aeration and Oxygen Transfer: The Engineering of Gas Transfer
• CFD Modelling of Water Treatment Processes: Turbulence Closure, Multiphase Methods and Validation

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• AMP8 Explained for Engineers: What the 2025-2030 Price Review Commits the Industry To
• Ballasted Flocculation Clarifier Design: Microsand and Magnetite Systems for Phosphorus and Storm Flows
• Neutralising Alkaline Construction Water with Carbon Dioxide: Chemistry, Dose, Contact Time and Permits
• Flow and Level Measurement at Wastewater Works: MCERTS, Primary Devices, Uncertainty and the Flow Settings They Protect
• Flow Distribution Chambers and Splitters: Getting an Equal Split to Parallel Treatment Units
• Inlet Screening Design for Sewage Works: Bar Spacing, Kirschmer Headloss, Screenings Quantities, Washing and Compaction
• Leak Detection and Repair: Minimum Night Flow, Acoustic Correlation and the Economics of Finding Water
• Oxygen Transfer in MBBR, IFAS and SAF Reactors: How Carrier Media Change Alpha, SOTE and Air Demand
• Moving Packaged Treatment Plant and Plant Rooms by Road: UK Dimensional Limits, Abnormal Loads and Module Sizing
• The Cost of Phosphorus Removal to Low Consents: Capex, Opex and Whole-Life Cost per Kilogram
• Where the Phosphorus in UK Sewage Comes From: A Per-Capita Budget and What It Means for Consents
• Pilot Trials and Validation Statistics: Proving a Process Will Meet Its Permit Before It Is Built
• Pipe Condition Assessment and Burst Prediction: From Pit Depth to the Economic Renewal Date
• Recarbonation and pH Correction with CO2 After Lime Softening or Lime Dosing
• Sewage Flows and Loads: Per Capita Design Values, Non-Domestic Sources, Phosphorus Apportionment and Tankered Waste
• Heat Recovery from Sewers and Treatment Works Effluent: UK Potential, Exchanger Choice, Temperature Limits and a 1 MW Worked Example
• Septicity in Sewers and Rising Mains: Predicting Sulphide, Preventing Corrosion and Controlling Odour
• Pumping Sewage Sludge: Bingham Rheology, Pipeline Pressure Drop and Pump Selection
• Smart Water Networks: District Metering, Pressure Management and What a Calibrated Model Really Adds
• Sizing Storm Attenuation and SuDS Storage with the Environment Agency Peak Rainfall Climate Change Allowances
• Submerged Aerated Filters and Biological Aerated Filters: Volumetric Loadings, Media Choice and the Hydraulics That Decide Performance
• Receiving Tankered Cesspool and Septic Waste at a Sewage Works: Strength, Inhibition, Reception Design and Load Limits
• Tertiary Cloth and Disc Filtration for Ultra-Low Phosphorus and Solids: Media, Loading, Coagulant and Full-Scale Results
• Tertiary Ultrafiltration of Secondary Effluent for Reuse: Screening, Inline Coagulation, Flux, Fouling, Cleaning and Cost
• Building the Hydraulic Profile of a Wastewater Treatment Works: From Flood Level at the Outfall to the Inlet Works
• Trenchless Pipe Rehabilitation: Choosing and Designing CIPP, Pipe Bursting and Sliplining
• UV Reactor Validation and Dose Monitoring for Water Reuse and Wastewater Disinfection
• Wastewater Temperature: Predicting It in Sewers and Tanks, and Designing for the Cold Case
• Weir Hydraulics for Flow Measurement and Flow Splitting: Sharp-Crested, V-Notch, Broad-Crested Weirs and Flumes
• Energy Benchmarking of Sewage Treatment Works: kWh per Population Equivalent, Guide and Target Values, and Where the Energy Goes
• Environmental Permitting in the UK for Water Discharges