Industrial River Pollution Crisis in Bangladesh
Bangladesh's Ready-Made Garment (RMG), textile dyeing, and chemical industries generate over 200 million liters of toxic industrial effluent daily. Untreated discharge has turned critical river basins — including the Buriganga, Turag, and Shitalakhya — biologically dead with dissolved oxygen (DO) levels dropping near zero.
Severe river pollution threatens aquatic ecosystems, destroys inland fisheries, and contaminates agricultural irrigation sources downstream.
Effluent Chemistry & Toxicological Load
Raw textile dyeing wastewater contains high concentrations of synthetic azo dyes, heavy metals (chromium, cadmium, lead), caustic soda, and surfactants. Typical chemical parameters far exceed environmental limits:
- BOD5 (Biological Oxygen Demand): 400–1,200 mg/L (Limit: 50 mg/L).
- COD (Chemical Oxygen Demand): 1,000–3,000 mg/L (Limit: 200 mg/L).
- TDS (Total Dissolved Solids): 4,000–8,000 mg/L (Limit: 2,100 mg/L).
Biological ETP Technologies (ASP, MBBR, MBR)
AIDE Private Limited provides biological and chemical ETP engineering design, auditing, and retrofitting for industrial clients:
Activated Sludge Process (ASP) & MBBR
Aerobic micro-organisms on suspended carrier media biodegrade organic dye compounds, reducing BOD by >95%.
Membrane Bioreactor (MBR)
Combining biological degradation with ultrafiltration membrane separation produces high-clarity permeate free of suspended solids.
Zero Liquid Discharge (ZLD) & Water Reuse
With industrial groundwater extraction tariffs rising, textile factories are adopting Zero Liquid Discharge (ZLD) systems. Combining MBR, Reverse Osmosis, and evaporators enables factories to recover 85–90% of process water for re-use in dyeing operations.
ZLD eliminates liquid discharge into local rivers while safeguarding factories against groundwater scarcity.
DoE Regulatory Clearance & Global Buyer Compliance
Operating ETPs is mandatory for obtaining Environmental Clearance Certificates (ECC) from the Department of Environment (DoE), as well as satisfying international apparel buyer standards (ZDHC, HIGG Index).
Learn about our industrial advisory offerings under AIDE Waste Management Services.
