GUIDE · DEFINITIONS · WASTEWATER

What Is a 20 MLD STP?

A 20 MLD STP is a sewage treatment plant designed to process 20 million litres of wastewater per day — about 20,000 m³/day — a mid-to-large municipal scale. Apex Integrated Solutions works in this class of plant; its founding team has achieved technical qualification on a USD 35M tender for a 20 MLD STP.

What MLD means

MLD = million litres per day, the standard capacity unit for water and wastewater plants in the Gulf and South Asia. 20 MLD = 20,000 m³/day = roughly 20 million standard buckets every day. For scale: 20 MLD typically serves a population on the order of 150,000–200,000 people at municipal consumption rates, or a large industrial estate.

Typical process trains at 20 MLD

  • Headworks — screening, grit removal, flow measurement
  • Primary clarification
  • Biological treatment — activated sludge (ASP), SBR or MBR at this scale
  • Tertiary filtration and disinfection (UV or chlorination) for reuse or discharge
  • Sludge handling — thickening, digestion, dewatering

What a 20 MLD tender covers

Sovereign and municipal tenders at this scale bundle process design, civil and electromechanical EPC, SCADA, 12–24 months of O&M or a BOT term, and performance guarantees on effluent quality. The founding team behind Apex has formulated techno-commercial proposals achieving technical qualification on bids up to USD 35M in exactly this class.

Delivery models

EPC — build to specification and hand over. BOT — finance, build, operate for the concession term, then transfer. See our BOT concessions guide for how the two compare.

Direct answers

How many people does a 20 MLD STP serve?

Roughly 150,000–200,000 people at typical municipal per-capita water use, though the actual service population depends on local consumption, infiltration and industrial inflow.

What is the difference between MLD and m³/day?

One MLD equals 1,000 cubic metres per day — so 20 MLD is 20,000 m³/day. MLD is the common tender unit; m³/day is the engineering unit used in process design.

Brief the command centre.

Direct engineering transmission to sales@apexis-global.com — or open the brief form on the main site.

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