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ETP & STP Design Framework

Engineering-Led, Compliant & Performance-Focused System Design

At SARK Engineers & Consultants, our Effluent Treatment Plant (ETP) and Sewage Treatment Plant (STP) design framework is built on engineering fundamentals, regulatory compliance, and long-term operational reliability.

Our approach combines detailed process analysis, proven design practices, and AI-assisted decision support—used strictly under expert engineering supervision—to deliver treatment systems that are effective, scalable, and compliant.

Where AI Is Applied in Our Design Workflow

Design Objectives & Regulatory Alignment

Every ETP/STP project begins with a clear understanding of treatment objectives, discharge norms, and site constraints.

This includes:

  • Review of influent characteristics and variability

  • Identification of applicable CPCB/SPCB norms

  • Understanding reuse, recycle, and ZLD requirements

  • Alignment with client operational and expansion plans

Outcome:
A clearly defined design basis and compliance framework.

Hydraulic & Process Design

Detailed design is carried out using established engineering calculations and standards.

This includes:

  • Hydraulic profile development

  • Equipment sizing and selection

  • Process control and automation considerations

  • Redundancy and reliability planning

AI-assisted tools may help compare operating scenarios; all calculations and drawings are engineer-approved.

Outcome:
Technically sound and operationally reliable system design.

Implementation Support & Performance Review

Where required, we support clients during execution and commissioning.

Support includes:

  • Technical clarifications to contractors

  • Commissioning support and performance checks

  • Post-commissioning optimisation

Outcome:
Treatment plants that perform as designed.

Influent Characterisation & Data Validation

Accurate design depends on reliable data. We undertake detailed influent assessment to establish realistic design parameters.

Activities include:

  • Review and validation of sampling and analysis data

  • Assessment of flow variations and peak loads

  • Evaluation of shock load and seasonal variability

AI-assisted analytical tools may support data trend analysis; final design inputs are engineer-validated.

Outcome:
Robust and defensible design inputs.

System Optimisation & Lifecycle Evaluation

Designs are evaluated for operational efficiency and long-term sustainability.

This includes:

  • Energy and chemical consumption optimisation

  • Sludge reduction and handling efficiency

  • CAPEX vs OPEX trade-off analysis

  • Provision for future load increase

Outcome:
Cost-effective and future-ready treatment systems.

Process Selection & Treatment Philosophy

Treatment processes are selected based on influent characteristics, discharge norms, footprint, and lifecycle costs.

This stage includes:

  • Evaluation of primary, secondary, and tertiary treatment options

  • Sludge handling and disposal strategy

  • Odour, chemical, and safety considerations

AI-assisted scenario comparison may be used to evaluate alternatives; process selection remains engineering-led.

Outcome:
Optimised treatment philosophy aligned with site and compliance needs.

Documentation, Drawings & Compliance Support

We deliver clear, regulator-ready documentation.

Deliverables typically include:

  • Process design documents

  • PFDs, P&IDs, and layout drawings

  • Equipment specifications

  • Compliance documentation for approvals

AI-assisted documentation tools support clarity and consistency; engineering sign-off remains mandatory.

Outcome:
Approval-ready documentation supporting smooth execution.

AI supports engineers. Engineers remain accountable.

Key Principles of Our ETP/STP Design Framework

  • Compliance with discharge norms is non-negotiable

  • Engineering judgement governs every design decision

  • AI supports analysis, not design ownership

  • Systems must be operable, maintainable, and scalable

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