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Integrated decentralised
waste water
treatment systems

(.pdf file)


Surface water sourcing study
for Auroville city area

A study exploring a multi-
sourcing approach for Auroville with the integration of the
Matrimandir lake


CSR Vortex system
See video and slide show


Integrated Decentralised Waste Water Treatment Systems

CSR has been implementing decentralised waste water treatment systems for over 25 years. Many Auroville households and settlements have and operate decentralised waste water treatment systems.

Treatment systems with large volumes of waste water are constructed in-situ, medium and smaller scale plants can be implemented with prefabricated ferrocement modules. In addition, vortex systems provide an innovative method for recycling waste water in places with limited space.


Decentralized Waste Water Treatment Systems are based on natural physical treatment techniques. These are put together in different combinations according to the needs and the financial budgets of users. The different devices cover pre treatment, primary, secondary, tertiary and post treatment stages.


Natural effluent treatment processes are achieved by using methods that follow natural physical principles combined with biological activities of microorganisms. Bacteria colonies in the treatment system are generated from microbial populations that occur naturally in the wastewater.


The treatment system requires minimal maintenance. The critical parts of the system work continuously and without needing intensive energy inputs. The technology can treat domestic and industrial (non-toxic) waste sources and has the capacity to treat flows from 1 - 500 m³ per day. The technology is tolerant to inflow fluctuation, has no complicated maintenance procedures and is without the use of chemicals at any stage. The treated water can be readily used for infiltration or irrigation.




Since CSR had existing skill experience in ferrocement technology, it was logical to use the technology for application in the area of sanitation. During the 80's, prefabricated ferrocement circular toilets were developed and found widespread use. The tsunami event in 2004 brought forward the basic need for emergency sanitation in temporary shelters and new settlements. CSR teams took up the challenge and developed prefabricated ferrocement community toilet blocks, connected with prefabricated modular ferrocement waste water treatment systems. About 26 community sanitation projects were implemented in Tamil Nadu during post-tsunami period.



Water Audits

The activity of water audits was initiated as a complementary part of the decentralised waste water projects that CSR undertakes with its industrial and other clients. A water audit is an accounting exercise. The income side or water extraction is noted and compared with the expenditure side or water consumption and analyzed. As in all accounting exercises, the end balance or total water balance indicates the health of the system being reviewed. A water audit is an integral component of the efforts to achieve a sustainable water resources management that will have direct impact upon the environment. CSR has executed water audits for 5 star hotels and industrial companies.


For information write to


Auroville Centre for Scientific Research (CSR)


Auroville 605101


Ph +91 (0)413 2622174 / 2622277 / 2622748

Fax +91 (0)413 26220

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