An On-Site STP (Sewage Treatment Plant) is a compact, engineered wastewater treatment system installed within a property to treat sewage at source before discharge or reuse.

Instead of sending wastewater to municipal systems, the treatment happens directly on-site — efficiently, safely, and in compliance with environmental regulations.

At BISOL Waste Water Solutions Ltd, our on-site STPs are designed for maximum performance in minimal space, while achieving full regulatory compliance.

What Our On-Site STP Does

Our system treats wastewater from:

• Toilets

• Bathrooms

• Kitchens

• Laundry areas

• Commercial wash areas

And converts it into environmentally safe effluent suitable for:

• Landscape irrigation

• Dust reduction 

• Controlled discharge

• Soak pit / leach field polishing

• Storm drain discharge ( fully compliant)

How the BISOL On-Site STP Works (Step-by-Step Process)

1️⃣ Primary Screening & Settling

Removes large solids and debris

Separates floating and settleable materials

Prevents clogging of downstream units

2️⃣ Biological Treatment (Bioaeration Process)

Advanced aeration introduces oxygen

Specialized bacteria break down organic waste

Reduces BOD (Biochemical Oxygen Demand)

Reduces COD (Chemical Oxygen Demand)

Controls odor and sludge buildup

3️⃣ Secondary Clarification

Allows remaining solids to settle

Produces clarified effluent

Returns active biomass to maintain system balance

 

Disinfection Stage

 

Controlled chlorine dosing

Ensures pathogen reduction

Achieves safe discharge standards

 

6️⃣ Final Compliance Monitoring

Effluent passes through a monitoring chamber

Sampling point provided for regulatory testing

Ensures standards are met before discharge

 

Compliance Achieved

Our On-Site STP systems are designed to meet and exceed:

✔ NEMA Environmental Discharge Standards
✔ Effluent BOD & COD Limits
✔ Suspended Solids (TSS) Requirements
✔ Pathogen Reduction Standards
✔ Environmental Disposal Guidelines
✔ Groundwater Protection Requirements

Typical Output Quality:

• BOD < 20–30 mg/L
• COD within discharge standards
• TSS < 30 mg/L
• Odor-free treated effluent
• Safe for reuse or controlled discharge

We engineer systems based on site-specific load calculations (PE – Population Equivalent), daily flow rates, and discharge destination.

 

Who Needs an On-Site STP?

• Apartments & gated communities

• Mixed-use developments

• Hotels & resorts

• Schools & institutions

• Hospitals

• Industrial parks

• Commercial buildings

• Developments without municipal sewer connection

Why Choose BISOL On-Site STP?

✔ Engineered, not improvised

✔ Fully automated control systems

✔ Batch or continuous operation options

✔ Integrated filtration & polishing

✔ Long-term operational stability

✔ Reduced desludging frequency

✔ Designed for environmental approval

 

We don’t just install tanks.

We design complete treatment ecosystems.

The BISOL Difference

Our STPs combine:

Engineering precision

Biological efficiency

Regulatory compliance

Space optimization

Operational durability

 

 

Ready to Secure Full Environmental Compliance?

Wastewater management is not optional — it is a regulatory obligation.

Partner with BISOL Waste Water Solutions Ltd and install a professionally engineered On-Site STP designed for performance, durability, and compliance.

✔ Compact design

✔ Fully automated systems

✔ NEMA-compliant discharge

✔ Engineered for long-term stability

Book a Site Assessment Today.

📞 +254 722 707 664

📞 +254 789 810 344