Design, Build and Construction

A sewage treatment plant is not simply a collection of tanks and equipment.

Successful STP construction requires proper coordination between the treatment process, civil structures, mechanical equipment, piping, electrical systems, controls, and site conditions.

CebuSTP combines these disciplines into one integrated design-and-build approach.

Our Scope

Engineering Design
Civil & Structural Construction
Mechanical Equipment Supply & Installation
Piping Works
Electrical & Control Systems
Testing & Commissioning
Plant Start-Up & Turnover

01 — Project Assessment

Every project begins with understanding the actual wastewater requirement.

Our team evaluates:

• Project type and facility use
• Number of occupants or users
• Wastewater generation
• Required STP capacity
• Wastewater characteristics
• Available plant area
• Site elevations and access
• Existing utilities
• Discharge or reuse requirements
• Project schedule
• Future expansion requirements

This information establishes the basis for both engineering and construction planning.

02 — STP Process Design

The treatment system is developed according to the wastewater characteristics, required treatment performance, available space, and operational requirements.

Depending on the project, treatment technologies may include:

Activated Sludge

A proven biological wastewater treatment process suitable for many domestic sewage applications.

AO — Anoxic/Oxic

For biological treatment requiring organic and nitrogen removal.

AAO — Anaerobic/Anoxic/Oxic

For applications requiring enhanced biological nutrient treatment.

MBBR — Moving Bed Biofilm Reactor

A compact biofilm treatment system suitable for projects requiring efficient biological treatment within a reduced footprint.

MBR — Membrane Bioreactor

Combines biological treatment with membrane separation for compact facilities requiring high-quality treated wastewater.

SBR — Sequencing Batch Reactor

A flexible biological treatment process where treatment stages are performed sequentially within the reactor.

Hybrid Treatment Systems

Different treatment technologies may be combined where project conditions require a customized solution.

The selected process becomes the foundation of the entire STP design and construction.

03 — Detailed Engineering

Before construction begins, the treatment facility is developed into coordinated engineering plans and technical requirements.

Our engineering scope may include:

• Design basis
• Process calculations
• Process Flow Diagram
• Hydraulic calculations
• Tank sizing
• General Arrangement Plan
• Civil and structural requirements
• Equipment layout
• Mechanical layout
• Piping layout
• Air distribution system
• Sludge handling system
• Electrical requirements
• Instrumentation and control requirements
• Equipment specifications
• Technical schedules

The objective is to resolve critical engineering requirements before and during construction.

04 — Civil & Structural Construction

CebuSTP can undertake the construction of the treatment plant structures required by the approved design.

Depending on the project, works may include:

• Site preparation
• Excavation
• Reinforced concrete treatment tanks
• Equipment foundations
• Pump pits
• Equipment rooms
• Control rooms
• Access platforms
• Walkways
• Drainage provisions
• Equipment supports
• Structural steel works
• Waterproofing
• Protective coatings
• Associated civil works

Treatment structures are constructed according to the process requirements and coordinated equipment layout.

05 — Mechanical Equipment Installation

Once the main structures are ready, the mechanical treatment equipment is installed and integrated into the facility.

Typical STP equipment may include:

• Influent pumps
• Transfer pumps
• Recirculation pumps
• Sludge pumps
• Air blowers
• Fine-bubble diffusers
• Submersible mixers
• Screens
• MBBR media
• Clarifier equipment
• Membrane systems
• Filtration equipment
• Chemical dosing systems
• Disinfection equipment
• Sludge treatment equipment

Equipment is selected and installed according to the calculated operating requirements of the plant.

06 — STP Piping Works

A properly constructed treatment plant requires an integrated piping system connecting every treatment stage.

Our piping scope may include:

• Influent wastewater lines
• Transfer piping
• Recirculation lines
• Return sludge lines
• Waste sludge piping
• Air distribution piping
• Treated-water piping
• Chemical dosing lines
• Overflow lines
• Drain lines
• Valves and fittings

Pipe sizes and routing are coordinated with the hydraulic and process requirements of the STP.

07 — Electrical, Controls & Automation

The electrical and control system allows pumps, blowers, mixers, dosing systems, and other equipment to operate as one coordinated treatment facility.

Depending on the project, the system may include:

• Motor control panels
• Pump controls
• Blower controls
• Level controls
• Float switches
• Timers
• Flow monitoring
• Alarm systems
• Instrumentation
• Automatic dosing controls
• PLC-based controls
• Human-machine interface where required

The level of automation is selected according to the complexity and operating requirements of the plant.

08 — Testing & Commissioning

Construction completion is not the end of an STP project.

Before turnover, the installed systems must be inspected, tested, and placed into operation.

Commissioning activities may include:

Mechanical Testing

Checking pumps, blowers, mixers, piping, valves, and mechanical equipment.

Electrical Testing

Verifying control panels, motors, sensors, protection devices, and operating sequences.

Hydraulic Testing

Confirming wastewater flow through tanks, piping, pumps, and treatment stages.

Equipment Start-Up

Starting and adjusting installed treatment equipment according to operating requirements.

Biological Process Start-Up

Establishing the biological treatment process and developing appropriate operating conditions.

Process Adjustment

Adjusting aeration, recirculation, sludge wasting, dosing, and other operating parameters.

System Turnover

Providing the final operating configuration and basic plant operating instructions.

One Integrated STP Project

DESIGN

We establish the treatment process, capacities, tanks, equipment, piping, controls, and plant layout.

Design Basis → Process Selection → Calculations → Detailed Engineering

↓

BUILD

We transform the approved engineering design into the physical treatment facility.

Civil Works → Structures → Equipment Installation → Piping → Electrical

↓

COMMISSION

We test, start, adjust, and prepare the system for actual wastewater treatment operation.

Testing → Start-Up → Process Adjustment → Turnover

New STP Construction

For new developments, CebuSTP can deliver the treatment facility beginning from the initial project concept.

Our integrated approach reduces coordination between multiple independent contractors and allows the design, civil works, equipment, piping, electrical systems, and commissioning to be developed as one treatment system.

Suitable for:

• New residential developments
• Condominiums
• Commercial buildings
• Hotels and resorts
• Hospitals
• Schools and universities
• Mixed-use developments
• Industrial facilities
• Manufacturing plants
• Food-processing facilities
• Institutional projects

STP Expansion & Capacity Upgrade

Existing sewage treatment plants may require expansion when wastewater generation increases beyond the original design capacity.

CebuSTP can evaluate the existing facility and develop an expansion solution that may involve:

• Additional treatment tanks
• Additional biological capacity
• Process conversion
• Aeration upgrades
• Additional blowers
• Pump upgrades
• Additional clarification
• MBBR integration
• Membrane treatment
• Tertiary treatment
• Sludge handling improvements
• Electrical and control upgrades

Where practical, usable existing tanks and equipment can be incorporated into the upgraded design.

STP Rehabilitation & Reconstruction

Older or poorly performing treatment plants may require more than simple equipment replacement.

Our team can evaluate the complete system and identify deficiencies involving:

• Treatment process
• Tank capacity
• Hydraulic flow
• Aeration
• Sludge management
• Mechanical equipment
• Piping
• Electrical systems
• Controls
• Physical deterioration

The rehabilitation design can then be implemented through coordinated construction and equipment upgrading.

Underground STP Construction

For developments where space is limited, the treatment facility may be incorporated beneath:

• Parking areas
• Landscaped areas
• Building service zones
• Open spaces
• Other designated areas

Underground STPs require careful coordination of:

• Structural loading
• Tank configuration
• Equipment access
• Ventilation
• Odor control
• Maintenance access
• Sludge removal
• Pumping requirements
• Electrical safety

These considerations are incorporated during the design stage before construction.

Above-Ground & Modular STP Systems

Where appropriate, CebuSTP can also develop above-ground or modular treatment facilities.

These systems may provide advantages for projects requiring:

• Faster deployment
• Reduced underground construction
• Easier equipment access
• Future expansion
• Compact treatment configurations
• Prefabricated treatment modules

The appropriate configuration is determined based on site conditions and project requirements.