The 2030 Agenda for Sustainable Development identifies 17 Sustainable Development Goals (SDGs), and SDG 6 focuses on universal access to water and sanitation services, emphasizing their long-term sustainability. SDG 6 divides into six specific target areas to accomplish this goal, each with its own defined objective. 

One of these targets, SDG Target 6.3, aims to address the issue of untreated wastewater while promoting recycling and safe reuse practices on a global scale by 2030.

SDG Target 6.3 Overview

SDG Target 6.3 comprises two indicators, 6.3.1 and 6.3.2, providing specific measurements to monitor progress. Indicator 6.3.1 assesses the proportion of domestic and industrial wastewater flows that undergo safe treatment. By monitoring this indicator, the UN can evaluate the effectiveness of the wastewater treatment process to protect public health and the environment. Indicator 6.3.2 measures the proportion of bodies of water that demonstrate good ambient water quality. This indicator helps the UN gauge water sources’ overall health and cleanliness, indicating progress in reducing pollution and preserving aquatic ecosystems. 

Botswana Case Study

Effective wastewater management plays a pivotal role in mitigating water scarcity issues in water-stressed countries. Botswana, renowned for being one of the most drought-prone countries globally, presents a compelling case study with its recurrent and extended periods of drought dating back to the 1950s. These droughts have severely affected food security, leaving more than 10% of the population grappling with chronic food insecurity. Moreover, the agricultural sector, upon which 70% of the rural population depends for their livelihoods, suffers greatly as irrigation and crop production primarily rely on rainfall. The adverse impact is exemplified by the staggering number of cattle deaths, with nearly 40,000 recorded during the 2018-2019 drought. 

To underscore the severity of the situation further, the World Bank’s calculations in 2020 revealed that Botswana’s freshwater withdrawal ratio stood at 2.31, indicating that the country consumes more freshwater than it has available.  

Recognizing the need to tackle these challenges and foster economic growth, the government of Botswana conducted a case study. The case study addresses how standards can be used for wastewater treatment and reuse, aligned with SDG Target 6.3, by improving water quality through pollution reduction. The government of Botswana developed national water standards based on international standards developed by the Water Quality Technical Committee through the Botswana Bureau of Standards. 

The government of Botswana involved its Department of Water Affairs in this case study by implementing these standards to treat wastewater discharged from its Headquarters through a constructed wetland system. The study then tested samples from this system for effluent quality in accordance with drinking standards, irrigation standards and wastewater discharge requirements. 

The results from the case study demonstrated that the constructed wetland system effectively treated wastewater for non-drinking purposes such as irrigation, construction and dust suppression. Emphasizing the potential impact of wastewater management, adequately treated wastewater can contribute 16% of Botswana’s available water resources. 

Implications for Developing Countries

The success of this case study demonstrates that other institutions in Botswana can replicate the use of constructed wetlands for on-site wastewater treatment and reuse for non-drinking purposes. However, the implications extend beyond Botswana. Globally, 80% of wastewater is released into the environment without adequate treatment. Jennifer Garner, Global Director of the World Bank Global Practice, emphasizes the crucial role of water treatment and reuse in addressing water scarcity and pollution issues, particularly considering that 36% of the global population resides in regions with limited water access. Properly treated wastewater can substitute fresh water in multiple applications, such as irrigation, industrial processes and recreational activities. Furthermore, it contributes to preserving natural ecosystems’ flow, while the by-products generated during the treatment process can be utilized to generate energy and nutrients. 

Access to water is essential for driving economic growth, supporting healthy ecosystems and sustaining life. Approximately 3.6 billion people worldwide lack safely managed sanitation services, disproportionately affecting developing countries. Developing countries can access clean water for irrigation, health and sustainable living by working towards SDG Target 6.3 and halving the proportion of untreated wastewater by 2030.

– Clara Swart
Photo: Flickr