Updated on January 12, 2024


Created on October 1, 2020

NG-SEPCLEAN (Next Generation Septic Tank)

Upcoming Update

The NG-SEPCLEAN is a decentralized sewage treating septic tank developed to provide safe sanitation through treated wastewater.

Tested By
  • Environment & Public Health Organization (ENPHO)
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Product Description

The NG-SEPCLEAN is a decentralized sewage treating septic tank developed to provide safe sanitation through treated wastewater, developed by Emergy Enviro Pvt. Ltd. The design is applicable where traditional septic tanks are unsuitable such as lack of space for a drain field, high water tables, proximity to wells or other bodies of water, and inadequate percolation. The NG-SEPCLEAN is designed for a high rate of digestion, low footprint, and reuse of treated wastewater.

Target SDGs

SDG 6: Clean Water and Sanitation

Target Users (Target Impact Group)

Household, Community, Small and Medium-sized Enterprises, Public Sector Agencies

Distributors / Implementing Organizations

Emergy Enviro Pvt. Ltd, a SINE-IIT Bombay company

Competitive Landscape

Manufacturing/Building Method


Intellectural Property Type


User Provision Model

This product can be acquired by contacting Emergy Enviro Pvt. Ltd.

Distributions to Date Status

As of 2020, the NG-SEPCLEAN is implemented at 8 sites across India.

Flow rate (L/min)

Flow rate dependant on site specifications.

0.219-0.729 L/min (Households)

1.458-21.875 L/min (Public toilets)

Power Supply Type

No power required

Technology type

Sedimentation, Flocculation, Anaerobic, Aerobic, Filtration

BOD Removal Efficiency


COD removal efficiency


NH4-N Removal Efficiency


TSS removal efficiency


Total Phosphorus Removal Efficiency


Fecal Coliform Removal Efficiency


Design Specifications

The NG-SEPCLEAN requires less land space compared to traditional septic tanks. The principle components and functions include:

  1. Inlet: Wastewater enters the system
  2. Primary treatment: sedimentation and flocculation in the Settler Unit
  3. Secondary treatment: aerobic and anaerobic treatment in the Digester Unit
  4. Tertiary treatment: disinfection and filtration through the Filtration and Disinfection unit
The system flow rate is dependant on the size and site specifications.

Product Schematics

Technical Support

Provided by the manufacturer.

Replacement Components



30-40 years

Manufacturer Specified Performance Parameters

The manufacturer specifies the following as performance targets:

  • Improved performance compared to traditional septic tanks by 30-35%
  • Retention time of 24 hours
  • Low space requirements
  • Solid removal efficiency (~85%)
  • Organic removal efficiency (~85%)
  • No operation costs
  • No odour
  • Lower frequency for cleaning and maintenance

Vetted Performance Status

The average removal efficiencies of the Decentralised Wastewater Treatment System (DEWATS) in Nepal is 96% TSS, 90% BOD5, 90% COD, 70% NH4–N, 26% TP and 98% FC.


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

Complementary Technical Systems

The effluent from these digesters can be further treated through Phytorid technology as a polishing step and then dispose into the river.

Academic Research and References

Singh, S., et al., 2009, “Performance of an anaerobic baffled reactor and hybrid constructed wetland treating high-strength wastewater in Nepal – A model for DEWATS“, Ecological Engineering 35: 654-660.

Kerstens, S. M., et al., 2012, “Evaluation of DEWATS in Java, Indonesia“, Journal of Water, Sanitation and Hygiene for Development 2: 254-265.

Reynaud, N., Buckley, C., 2015, “Field-data on parameters relevant for design, operation and monitoring of communal decentralized wastewater treatment systems (DEWATS)“, Water Practice and Technology 10: 787-798.

Goal 6. Available: https://sdgs.un.org/goals/goal6

Compliance with regulations

Design and construction in compliance with IS 2470-2 (1985): Code of practice for installation of septic tanks, Part II: Secondary treatment and disposal of septic tank effluent.

Evaluation methods

The manufacturer cites solid and organic removal efficiency and 75-90% TSS removal evaluation criteria.

Other Information

Enlisted in the Ministry of Drinking Water and Sanitation innovative products list. NG-SEPCLEAN Design Specifications.  IS 2470-2 (1985)  

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