Use of wastewater in urban agriculture is critical to farmers' income and food security but raises health risks
In the face of growing water scarcity, use of wastewater in agriculture has become inevitable in urban areas of developing countries
Though only treated wastewater should be used in agriculture, in absence of adequate infrastructure, farmers in poorer cities use raw or partially-treated wastewater.This can cause infectious diseses
In 70 per cent cities,s ome amount of industrial effluents are also found mixed with it
Not-so-clean crop |
|
Water sources, quality and methods used in wastewater agriculture |
|
200 million farmers across the world use such highly-contaminated water to irrigate 20 million hectare (ha) of land.In developing countries, over 1.1 million farmers follow this practice to make a living from 0.4 million ha of land
These farmers, in urban and peri-urban areas, help ensure an immediate supply of perishable food to cities, primarily fresh vegetables.They also cultivate cereals and fodder
They access wastewater easily and free of cost.Some 43 per cent) believe it is a vital source of plant nutrients and save on fertilizers
Farmers (in 38 per cent cities) are aware that using wastewater in agriculture poses health risks both for them and consumers, but in the absence of alternative source of irrigation, they have no choice
Most developing countries (54 per cent) have no guidelines to regulate the use of wastewater in agriculture.Eight countries have their own guidelines while another four follow guidelines set by the
fao or the
who
Even in these 12 countries, enforcement of regulations and monitoring rarely happen.The bans are mostly on wastewater use in cultivation of vegetables that are eaten uncooked
Consumers want to avoid wastewater produce.But most of them (90 per cent) have no way of knowing the origin.Hence, they end up consuming produces grown on wastewater
Source Comprehensive assessment of water management in agriculture, a survey report by International Water Management Institute. The survey was done in 53 cities in developing nations
Health risks |
- Exposure to a variety of pathogens can cause skin irritation and gastro-intestinal disorders among farmers
- The pathogens and other chemicals like heavy metals from industrial effluents also contaminate crops and thus affect those who consume it
|
|
|
All that we eat
Distribution of crop types grown with wastewater |
Type of crop |
Number of cities |
Africa |
Asia |
Latin America |
Middle-East |
Vegetables |
8 |
16 |
7 |
1 |
Cereals |
5 |
15 |
5 |
2 |
Fodder |
1 |
5 |
3 |
0 |
Other |
1 |
5 |
3 |
2 |
|
We are a voice to you; you have been a support to us. Together we build journalism that is independent, credible and fearless. You can further help us by making a donation. This will mean a lot for our ability to bring you news, perspectives and analysis from the ground so that we can make change together.
Comments are moderated and will be published only after the site moderator’s approval. Please use a genuine email ID and provide your name. Selected comments may also be used in the ‘Letters’ section of the Down To Earth print edition.