Decentralized Wastewater Treatment Systems (DEWATS)

Target SDGs

Market Suggested Retail Price

$50,000.00

Target Users (Target Impact Group)

Household, Community, Public Sector Agencies

Distributors / Implementing Organizations

This solution is implemented by Bremen Overseas Research & Development Association (BORDA)

Competitive Landscape

Direct competitors include The Biofil Digester and Biopipe.

Countries

Afghanistan, Bangladesh, Bhutan, Cambodia, Cuba, Ecuador, Haiti, India, Indonesia, Iraq, Laos, Lesotho, Mali, Mexico, Nepal, Nicaragua, Philippines, South Africa, Tanzania, Vietnam, Zambia

Manufacturing/Building Method

All materials used for construction are locally available.

Intellectural Property Type

Open-source

User Provision Model

Users can contact BORDA for information on service packages offered for DEWAT solutions.

Distributions to Date Status

As of 2017, more than 750 DEWATS plants were currently operating.

Design Specifications

The DEWAT functions as follows:

1. Primary treatment involving sedimentation and flotation
2. Secondary anaerobic treatment in fixed-bed reactors: baffled upstream reactors or anaerobic filters
3. Tertiary aerobic treatment in sub-surface flow filters
4. Tertiary aerobic treatment in polishing ponds
5. Systems can be designed to handle organic wastewater flows from 1-1000 m³ per day
6. Systems are built to be tolerant towards fluctuations in loads

Product Schematics

Technical Support

Experienced DEWATS experts facilitate comprehensive training programs for qualified staff of partner organizations and take on a supervisory role during the initial technical implementations.

Replacement Components

Unknown

Lifecycle

Unknown

Manufacturer Specified Performance Parameters

Performance targets for DEWAT technologies are targeted at achieving the following advantages:
1. Providing treatment for domestic and industrial wastewater
2. Low primary investment costs as no imports are needed
3. Efficient treatment of daily wastewater flows up to 1000 m³
4. Modular design of all components
5. Tolerant towards inflow fluctuations
6. Reliable and long-lasting construction design
7. Expensive and sophisticated maintenance not required
8. Low maintenance costs

Vetted Performance Status

Testing performed to assess the average removal efficiencies for a DEWATS facility in Nepal consisting of an Anaerobic Baffled Reactor and Constructed Wetland: 96% TSS, 90% BOD, 90% COD, 70% NH4-N, 26% Total P, and 98% FC.

Safety

Sludge must be handled, treated and disposed of in accordance with hygiene and environmental standards.

Complementary Technical Systems

DEWATS technical layouts can be optimized to provide a renewable energy source in the form of biogas.

Academic Research and References

Compliance with regulations

Regulations vary by project location. A case study in Indonesia revealed over 90% of systems tested complied with Indonesian environmental regulations of BOD effluent less than 100 mg/L.

Evaluation methods

DEWAT technologies are evaluated for their capability to provide efficient treatment for domestic and industrial wastewater.

Other Information

• Schematics illustrating processes employed by DEWAT systems
• Presentation about Decentralised Waste Water Treatment System (DEWATS).
• Case study - Review of Community-Managed Decentralized Wastewater Treatment Systems in Indonesia
• DEWATS – Sustainable treatment of wastewater  at the local level
• A Practical Guide - BORDA, WEDC