Sewage Treatment for Buildings That Need a Building Permit
Clearion designs compact, high-performance Sewage Treatment Plants required under BNBC and DoE regulations for apartment complexes, hotels, hospitals, commercial buildings, and industrial campuses.
At a Glance
From raw sewage to safe discharge
Clearion STPs treat mixed domestic and light commercial sewage through a structured biological and physical treatment sequence — sized to building occupancy and flow patterns.
Bar screens and grit chambers remove rags, paper, plastics, and heavy grit before they can damage downstream equipment or block pipework — protecting mechanical components from abrasion.
BNBC mandates an STP for these building types
Bangladesh National Building Code (BNBC 2006) and Rajuk building regulations require a functional STP for all multi-storey residential and commercial buildings before occupancy certification is issued.
Residential Apartments
Required for all multi-storey apartment complexes. Compact underground or basement-installed systems available for space-constrained sites.
Hotels & Resorts
High-flow, variable-load STPs matched to occupancy patterns — with effluent quality suitable for garden irrigation reuse.
Hospitals & Clinics
Healthcare STPs include disinfection stages for pathogen removal and meet WHO health-facility discharge standards.
Commercial & Office Towers
Consistent-load systems with minimal odour and small footprint — designed to integrate with building basement infrastructure.
Industrial Campuses
Combined domestic and canteen sewage treatment for factory worker facilities and admin blocks.
Educational Institutions
Cost-effective systems scaled to student and staff population with low operational complexity.
Design parameters
| Parameter | Typical / DoE Limit |
|---|---|
| Treatment Capacity | 10 – 3,000 m³/day |
| Inlet BOD | 150 – 350 mg/L |
| Outlet BOD | ≤ 50 mg/L |
| Inlet COD | 300 – 700 mg/L |
| Outlet COD | ≤ 200 mg/L |
| Suspended Solids | ≤ 100 mg/L (outlet) |
| Total Coliforms | ≤ 400 MPN/100 mL |
| pH (outlet) | 6.0 – 9.0 |
| Ammonia-N (outlet) | ≤ 10 mg/L |
| Odour | Minimal (enclosed units) |
All systems designed to BNBC and DoE ECR 1997 standards. Parameters confirmed after site characterisation.
Ready to resolve your compliance risk?
Tell us about your facility, discharge requirements, and timeline. Our engineers will review your situation and provide a detailed proposal — at no cost and with no obligation.