DEWATS stands for “Decentralized Wastewater Treatment Systems”.

DEWATS is a technical approach rather than merely a technology package.
The applications are based on the principle of low-maintenance since most important parts of the system work without technical energy inputs and cannot be switched off intentionally.
DEWATS applications provide state-of-the-art-technology at affordable prices because all of the materials used for construction are locally available.

DEWATS applications provide treatment for both, domestic and industrial sources

DEWATS applications provide treatment for organic wastewater flows from 1-1000 m3 per day

DEWATS applications are reliable, long lasting and tolerant towards inflow fluctuation

DEWATS applications do not need sophisticated maintenance

Without considering facilities for necessary chemical pre-treatment of wastewater from industries, DEWATS applications are based on four basic technical treatment
modules which are combined according to demand:

Primary treatment: sedimentation and floatation

Secondary anaerobic treatment in fixed-bed reactors: baffled upstream reactors or anaerobic filters

Tertiary aerobic treatment in sub-surface flow filters

Tertiary aerobic treatment in polishing ponds

DEWATS applications are designed and dimensioned in such a way that treated water meets requirements stipulated in environmental laws and regulations.



Main Dewats modules for physical and biological wastewater treatment:
1. Settler 2. Anaerobic Baffled Reactor 3. Anaerobic Filter 4. Planted Gravel Filter

Generally, going for decentralised wastewater treatment means:

Ensuring efficient and sustainable treatment through scientifically advanced treatment processes despite small amounts of wastewater and expected low level of maintenance.

Accepting unavoidable low degree of treatment for the price of reliability. Purposeful switching off the system is not possible.

Assigning separate treatment steps to different users or locations according to site conditions.

Providing plots of adequate size to install on-site treatment systems within industrial estates or provision of free space within housing colonies, hospitals, or any other compound without connection to outside sewers.

Organising maintenance: direct execution by a service organisation and/or supervision and training of on-site maintenance personnel.

Providing and organising economic issues such as investment and running cost of community based and managed treatment systems.