NG-SEPCLEAN (Next Generation Septic Tank)
Emergy Enviro Pvt. Ltd
The NG-SEPCLEAN is a decentralized sewage treating septic tank developed to provide safe sanitation through treated wastewater.
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.
Decentralised sewage treatment competitors include Biofil Digester, Johkasou and open source Decentralised Wastewater Treatment Systems (DEWATS).
Goal 6: Clean water and sanitation
Target areas include rural areas, schools, commercial buildings, hostels and dormitories, coastal zone, hilly regions, flat terrains, slums, households, construction sites.
There are no topographical limitations noted for the installation of the system.
This product can be acquired by contacting Emergy Enviro Pvt. Ltd.
As of 2020, the NG-SEPCLEAN is implemented at 8 sites across India.
Flow rate of the equipment
Type of wastewater treatment process
How effective is the process at BOD removal?
How effective is the process at COD removal?
How effective is the process at NH4-N removal?
How effective is the process at total suspended solid removal?
How effective is the process at total phosphorus removal?
How effective is the process at fecal coliform removal?
The NG-SEPCLEAN requires less land space compared to traditional septic tanks. The principle components and functions include:
- Inlet: Wastewater enters the system
- Primary treatment: sedimentation and flocculation in the Settler Unit
- Secondary treatment: aerobic and anaerobic treatment in the Digester Unit
- Tertiary treatment: disinfection and filtration through the Filtration and Disinfection unit
The system flow rate is dependant on the size and site specifications.
Provided by the manufacturer.
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
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.
Nepal Environmental and Public Health Organization (ENPHO).
Wastewater must be handled, treated and disposed of in accordance with hygiene and environmental standards.
The effluent from these digesters can be further treated through Phytorid technology as a polishing step and then dispose into the river.
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, pp. 654-660.
Kerstens, S. M., et al., 2012, “Evaluation of DEWATS in Java, Indonesia“, Journal of Water, Sanitation and Hygiene for Development, 2, pp. 254-265.
Reynaud, N., Buckley, C., 2015, “Field-data on parameters relevant for design, operation and monitoring of communal decentralzed wastewater treatment systems (DEWATS)“, Water Practice and Technology, 10, pp. 787-798.
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.
The manufacturer cites solid and organic removal efficiency and 75-90% TSS removal evaluation criteria.
Enlisted in the Ministry of Drinking Water and Sanitation innovative products list.
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