DEWATS Solutions
Decentralised wastewater treatment systems (DEWATS) treat wastewater close to where it is produced: at institutions, bus stations, housing estates and in secondary towns that a central sewer will not reach for years.
Anaerobic baffled reactors, often paired with wetlands
An anaerobic baffled reactor is a compact, buried tank where wastewater flows up and down through a series of chambers, so bacteria digest the organic load without energy or moving parts. Followed by a constructed wetland, it forms a complete treatment train.
- Pretreatment: screens, grit removal and oil separators where kitchens, workshops or car washes discharge.
- Treatment: settler and baffled chambers sized for the daily flow, in parallel trains so one can be maintained while the other runs.
- Polishing and reuse: a wetland or filter after the reactor, and biogas capture where it pays.
- Design package: process sizing, hydraulic profiles, drawings, bills of quantities and operation guidelines.
Hydraulic design of an ABR treatment system, Shegole bus station, Addis Ababa
A two-train anaerobic baffled reactor treating 75 m³ a day from the station buildings and car wash, with an oil separator and pretreatment ahead of it, and treated effluent piped to the river.
Running a water utility, or a programme that supports water utilities?
Tell us about your town and its wastewater or sludge challenge, and we'll show you what has worked elsewhere and how it could fit.