Effluent Treatment Plant
Industrial Wastewater Treatment — DoE-Compliant & Export-Ready
Hydro Engineering Solutions designs, supplies, and installs Effluent Treatment Plants that meet Bangladesh DoE discharge standards and satisfy EU buyer environmental audits — engineered specifically for your facility's flow rates and inlet characteristics.
Capacity Range
50 – 5,000 m³/day
Treatment Stages
Primary · Secondary · Tertiary
Compliance Target
Bangladesh DoE ECR 2023
Industries Served
Textile · Tannery · Pharma · Food
Documentation
Full DoE approval package
Support
AMC lifecycle contracts
How It Works
Multi-stage treatment process
Every Hydro Engineering ETP moves wastewater through a series of engineered stages, each removing a specific category of contaminant before the final discharge meets DoE parameters.
Screening & Equalisation
Bar screens remove large solids. An equalisation tank buffers flow variations so downstream units receive a consistent load — essential for stable downstream treatment performance.
Chemical Coagulation & Flocculation
Coagulants (alum, PAC, ferric chloride) neutralise surface charges on fine particles and aggregate them into large, settleable floc. Polymer aids improve floc structure and settling rate.
Primary Clarification
Floc settles in a lamella or tube settler clarifier. Sludge is collected at the base, thickened, and sent to sludge handling. Clarified water advances to biological treatment.
Biological Treatment (ASP/SBR)
Aerobic bacteria break down dissolved organic matter (BOD/COD). Activated sludge or sequencing batch reactors are selected and sized to your effluent composition for reliable organic removal.
Secondary Clarification
Biological sludge separates from treated water in a secondary settler. Return sludge maintains biomass concentration in the aeration tank; excess sludge is dewatered and disposed of.
Tertiary Polishing & Discharge
Sand/multimedia filtration and disinfection (chlorination or UV) bring treated water to DoE discharge limits. Final effluent quality is monitored before safe release to the environment.
Industries
Which industries require an ETP?
Under Bangladesh's Environment Conservation Rules (ECR 1997) and subsequent DoE notifications, all factories generating industrial effluent must treat wastewater before discharge.
Textile & Garments
Dyeing, washing, and finishing lines — colour, BOD, COD, and pH treatment essential for ZDHC compliance.
Leather & Tannery
Heavy metal (chromium), sulphide, and high-strength organic removal for Hazaribagh relocation compliance.
Pharmaceutical
API manufacturing effluent — solvent, active compound, and biological load treatment for DoE and WHO-GMP audits.
Food & Beverage
High BOD/COD from processing lines — biological treatment with grease traps and nutrient removal.
Paper & Pulp
Fibre, colour, and BOD load removal from paper mill effluent.
Chemical Industry
Mixed organic and inorganic contaminant streams requiring custom chemical treatment stages.
Technical Specifications
Design parameters
| Parameter | Typical Range |
|---|---|
| Treatment Capacity | 50 – 5,000 m³/day |
| Inlet BOD | 200 – 3,000 mg/L |
| Outlet BOD | ≤ 50 mg/L (DoE limit) |
| Inlet COD | 500 – 8,000 mg/L |
| Outlet COD | ≤ 200 mg/L (DoE limit) |
| Inlet TSS | 200 – 2,000 mg/L |
| Outlet TSS | ≤ 100 mg/L (DoE limit) |
| pH (treated) | 6.0 – 9.0 |
| Colour removal | Up to 98% |
| Hydraulic retention | 12 – 36 hours (site-specific) |
All parameters subject to site-specific design. Hydro Engineering Solutions engineers each system from a full inlet characterisation study.
Why Hydro Engineering Solutions
Engineering certainty, not just equipment
Site-specific design
We start from an inlet water analysis and site survey — every system is sized to your actual process load, not a catalogue specification.
DoE approval support
We prepare the full documentation package — process flow diagrams, design drawings, test reports, and operational manuals — and support you through inspection.
Construction supervision
Our engineers oversee civil works, equipment installation, and commissioning to ensure the built system matches the approved design.
AMC maintenance
Annual maintenance contracts cover scheduled servicing, reagent restocking, membrane replacement, and emergency response for the life of your plant.
Get Started
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.
- ✓ Site survey and inlet water analysis
- ✓ System design matched to your discharge standards
- ✓ Full regulatory documentation package
- ✓ Lifecycle maintenance contract options
Request a Free Consultation
No obligation. Our engineering team responds within 1 business day.