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Scientific Modelling & Simulation

Behind the design sits a full modelling toolkit — CFD, process simulation, biokinetic (ASM/ADM), reaction-kinetics, hydraulic, limnological and data-driven digital-twin modelling. We pick, or combine, the disciplines that answer your question and validate them against real data.

Explore Scientific Modelling

Process Flow Design Methodology

Process flow design is the foundation of every successful water treatment project. It involves defining the treatment ob

Site Survey

Laser scanning, utility mapping, and soil investigation inform the design. We account for existing infrastructure, access constraints, and future expansion needs.

Process Modelling

Mass balance, hydraulic, and process models size equipment correctly for peak, average, and minimum flow conditions. Over-design wastes Capital expenditure; under-design fails.

3D Modelling

Revit and SolidWorks models show exactly how equipment fits in the available space. Clash detection resolves pipework conflicts before steel is cut.

HAZOP Review

Hazard and operability studies identify process safety risks, environmental releases, and equipment failure scenarios. Mitigation measures are designed in from the outset.

Peer Review

Independent chartered engineers review calculations, drawings, and specifications. Third-party verification adds confidence for boards, lenders, and insurers.

Value Engineering

Constructability reviews during design identify operational benefits and programme efficiencies. Early contractor involvement prevents expensive surprises during installation.

Process Design Steps

Systematic Approach to Treatment Process Development

1

Define Treatment Objectives

Establish clear water quality targets based on influent characteristics, regulatory requirements, and end-use specifications. Document flow rates, peak loads, and any special requirements.

2

Influent Characterisation

Comprehensive analysis of raw water or wastewater quality including physical, chemical, and biological parameters. Identify seasonal variations and upset conditions.

3

Unit Process Selection

Identify appropriate treatment technologies for each contaminant of concern. Consider proven performance, footprint, energy requirements, and operational complexity.

4

Treatment Process Configuration

Arrange unit processes in logical sequence considering pretreatment requirements, chemical compatibility, and process interdependencies.

5

Mass Balance Development

Calculate flows, concentrations, and loads at each process step. Verify hydraulic and contaminant balances throughout the system.

6

Equipment Sizing

Size each unit process based on design flows, loading rates, and performance requirements. Include safety factors and future capacity.

Typical treatment processes

Common Process Configurations

Drinking Water Treatment

Raw Water → Coagulation → Flocculation → Sedimentation → Filtration → Disinfection → Distribution

Municipal Wastewater

Screening → Grit Removal → Primary Clarification → Biological Treatment → Secondary Clarification → Disinfection

Industrial Pre-treatment

Equalization → pH Adjustment → Coagulation/Flocculation → DAF → Biological Treatment → Polishing

RO Pre-treatment

Screening → Coagulation → Multimedia Filtration → Cartridge Filtration → RO → Post-treatment

Why Process Flow Design Matters

  • Incorrect mass balances lead to undersized equipment and performance failures.
  • Poor unit sequencing causes chemical incompatibility and operational conflicts.
  • Missing safety margins restrict future capacity expansion.
  • Inadequate influent characterisation results in Treatment Process mismatch.
  • Unclear process descriptions delay commissioning and operator training.

Core PFD Elements

Process Flow Diagrams

High-level visual representation of the Treatment Process showing major equipment, flows, and control points.

Mass & Energy Balances

Detailed calculations of flows, concentrations, and loads at each process step.

Equipment Lists

Comprehensive registers of all process units with preliminary sizing and duty points.

Process Descriptions

Narrative documents explaining operating principles, design basis, and control philosophy.

Industry Applications

Municipal Wastewater

Screening, advanced biological treatment, and disinfection trains sized for population equivalents and peak wet weather flows.

Industrial Pre-treatment

Equalization, pH adjustment, DAF, and biological stages for food, textile, and chemical effluents.

Drinking Water

Coagulation, flocculation, filtration, and disinfection sequences for potable supply.

Desalination & RO Pre-treatment

Multimedia filtration, cartridge filtration, and anti-scalant dosing for membrane protection.

Design Best Practices

Conservative Safety Margins

Built-in peaking factors and reserve capacity to handle flow and load variations.

Process Redundancy

Stand-by trains and bypass routes to maintain operation during maintenance.

Future Expansion

Space and hydraulic provisions for modular capacity upgrades.

Pilot Validation

On-site treatability studies to confirm design assumptions before full-scale commitment.

Performance & Delivery

>99%

mass balance accuracy

ISO 10628

compliant

2-4 weeks

standard delivery

50+

projects completed

Related Pages

Pid Biological Treatment Pids

P&ID development for advanced biological treatment systems: activated sludge, SBR sequencing, MBBR media retention, anaerobic.

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Pid Daf Flotation Pids

P&ID development for DAF and flotation systems: saturator pressure control, air dissolution loops, recycle pumps, flotation cell.

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Pid Flow Diagram Standards

Industry-standard flow diagrams for critical water treatment processes engineering.

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Pid Hazop Safety

HAZOP and process hazard analysis for critical water treatment processes plants.

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Pid Instrumentation Control

Instrumentation and control system design.

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Pid Standards Symbols

P&ID drafting standards and symbol libraries.

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Need Process Flow Design Support?

Our engineers can develop optimised treatment processes for your specific application and water quality requirements.

Industries We Serve

Our expertise spans multiple industries with sector-specific water treatment solutions.