Population growth, urbanisation, increasing industrialisation, climate change and a steep increase in water consumption are putting pressure on urban water resources in India. In order to cope with water shortages in urban areas, there is a need for a paradigm shift from conventional end-of-pipe water management to an integrated approach.

The main objective of the project is to develop a NaWaTech system which uses an integrated water management approach. This integrated approach should include several actions such as: (i) interventions over the entire urban water cycle; (ii) optimisation of water use by reusing wastewater and preventing pollution of freshwater source; (iii) prioritisation of small-scale natural and technical systems, which are flexible, cost-effective and require low operation and maintenance. Natural water systems, such as constructed wetlands, bank filtration and storage via soil aquifer treatment and bank filtration, are such systems. The use of different urban water flows shall be optimised by treating each of these flows via a modular natural system taking into account the different nature and degree of pollution of the different water sources as well as the different requirements for different usages.

Nawatech Scheme

 

 



Population growth, urbanisation, increasing industrialisation, climate change and a steep increase in water consumption are putting pressure on urban water resources in India. In order to cope with water shortages in urban areas, there is a need for a paradigm shift from conventional end-of-pipe water management to an integrated approach.

The main objective of the project is to develop a NaWaTech system which uses an integrated water management approach. This integrated approach should include several actions such as: (i) interventions over the entire urban water cycle; (ii) optimisation of water use by reusing wastewater and preventing pollution of freshwater source; (iii) prioritisation of small-scale natural and technical systems, which are flexible, cost-effective and require low operation and maintenance. Natural water systems, such as constructed wetlands, bank filtration and storage via soil aquifer treatment and bank filtration, are such systems. The use of different urban water flows shall be optimised by treating each of these flows via a modular natural system taking into account the different nature and degree of pollution of the different water sources as well as the different requirements for different usages.

Nawatech Scheme

 

 

Strategic objectives

Strategic objectives of NaWaTech:

1. To assess the technical, financial and environmental potential of natural water treatment technologies to cope with water shortages in urbanized areas in India.

2. To enhance the natural water treatment systems for the production of recycled water to supplement water sources considering extreme climatic conditions and highly & widely varying pollutions loads (e.g. monsoon floods).

3. To disseminate, exploit, and ensure the take-up in practice and mainstreaming of NaWaTech activities and output by key stakeholders (e.g. end-users, SMEs and service providers, decision makers). Develop technical guidelines, tools, and manuals for design, implementation and operation and maintenance as well as policy briefs.

4. To ensure the interest and potential benefit to SMEs by supporting the development of a local market of natural water treatment and storage technologies, and facilitating the local SMEs by organizing training and capacity building workshops. Ensure the participation of local SMEs in the implementation phase of the project itself (learning by doing).

5. To create an enabling institutional environment in order to allow the take-up in practice and mainstreaming of the results (e.g. align NaWaTech initiatives with existing urban water plans, strategies and policies).

6. To establish foundations of a long-term cooperation between EU and India in water technologies as part of the Strategic Forum for International Science and Technology Cooperation (SFIC) and establishing bridgeheads among research institutions and ensure the take up of the NaWaTech approach in educational curricula).

 

scientific objectives

The scientific objectives are:

(A) Pre-treatments of high-strength wastewaters (i.e. blackwater) prior to constructed wetlands (e.g. UASB):

-To achieve suspended solid removals by applying low rate anaerobic digestors.

-To couple constructed wetlands with sludge digesters in a compact design, with simple O&M requirements and increased lifespan.

(B) Constructed wetlands (CW) to improve the quality of different urban water sources (i.e. blackwater, greywater, rainwater and stormwater); potential coupling with soil aquifer treatment (e.g. infiltration ponds); the potential of root zone treatment for the improvement of surface water quality prior to bank filtration.

-To improve the performance of CWs, by predicting, preventing and delaying the clogging process.

-To optimize space requirements of constructed wetlands for the Indian context.

-To study and control the effects on salinity raise due to high evapotranspiration.

-To understand the influence of shading of wetland plants on treatment performance of the CW and to propose innovative methods to control the breeding of mosquitoes and other vectors of human diseases.

-To define the potential of producing high-value energy crops in constructed wetlands, considering the treatment performance, the environmental, social and economic implications.

-To couple constructed wetlands and managed aquifer recharge technologies, minimizing the risk for pollution through a multibarrier system.

(C) Soil filtration capacity via soil aquifer treatment (SAT) or Bank Filtration (BF) for the generation of (indirect) water sources; potential combination for the coupling with other natural water treatment systems for the improvement of the overall quality.

For soil aquifer treatment (SAT):

-To identify the Indian-specific physical, chemical, biological parameters controlling the removal performance, to better understand the process, facilitating the design and implementation.

-To study the removal of trace organic compounds.

-To measure and control the risk of microbiological contamination, relevant for drinking water production.

-To predict hydraulic retention times and removal efficiencies, as well as distance from treatment facility to point of abstraction (and flow velocity) through numerical modeling.

For Bank filtration (BF):

-To assess the effect of temperature and oxygen conditions in the soil (removal performance for suspended solids, microbial contamination, trace organic substances such herbicides or drugs and geogenic heavy metals).

- To predict hydraulic retention times and removal efficiencies, as well as distance from treatment facility to point of abstraction (and flow velocity) through numerical modeling.

(D) Compact technical treatment solutions adapted to high loads especially in urban areas such as MBR and SBR systems.

-To develop a system for simplified control for SBR.

-To develop a low energy aeration system for aerobic SBR and MBR adapted to the Indian conditions.

-To test anaerobic MBR systems under the Indian conditions.

-To optimize the combination of SBR and MBR (SMBR) into a robust system to cope with the needs of the Indian urban population.

(E) Potential post-treatment units (e.g. sand filtration, membrane filtration or UV-disinfection).

-To develop and test a simplified sand filtration system (slow/rapid filtration), requiring low-energy input and low operation and maintenance.

-To test the applicability of low pressure membrane filtration systems in the Indian context, particularly the operation and maintenance.

-To optimize an UV-disinfection or chlorination process for further polishing of the water.


Further scientific objectives to be achieved during the field research step at the NaWaTech in India are:

-To determine the economic, social, financial and environmental sustainability of the NaWaTech sites.

-To develop an operation and monitoring scheme that is technically viable and cost-effective for the application of NaWaTech approaches in urbanized areas of India.

-To ensure the sustainability of the NaWatech sites beyond the project duration, considering technical, financial, environmental and institutional aspects.

 

conclusion

It is anticipated that these projects will produce knowledge, technologies, guidelines and tools for implementation and operation, skilled service providers and SMEs, research partnerships and enabled institutional environments for the application of natural water treatment systems to cope with water shortages in urban areas of India. Besides the scientific enhancement, an important component of the projects is that it brings together all the involved  or stakeholders in urban water management. These multi-stakeholder learning alliances will be institutionalised in the NaWaTech community of practice (CoP) in order to achieve an impact beyond the project on the implementation of research and dissemination activities, by taking account of local problems and needs. Clearly, this will substantially contribute to a reduction in the vulnerability of Indian cities and their capacity to cope with water shortages.

Nawatech Team

Contact Information

 

Katie Meinhold
Project Manager

 

ttz Bremerhaven (google maps directions)
Wasser, Energie und Landschaftsmanagement
  Am Lunedeich 12 - 27572 Bremerhaven - Germany

E-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

Phone: +49 (0)471  809 34 192
Fax: +49 (0)471 809 34 599

 

Imprint

Sitemap