The nutrients in sanitation flow streams represent an increasing value from monetary, energy and resource perspectives. The market potential for making use of these resources in different ways clearly exists and can be developed further. This particular seminar is focusing on the nutrient content in sanitation flow streams and how linking sanitation with agriculture, or rather agriculture with sanitation, can cause win-win situations both from sanitation, food security and soil fertility perspectives. Cross-sector collaboration and using agriculture as a starting point for nutrient recycling interventions are two methods that have proven useful to achieve this desired win-win combination. This seminar is highlighting the urgency of the matter of nutrient recycling as well as show-casing some on-going developments within this field by presenting case studies from both African and European settings. The case studies are aimed at acting as an inspiration to seminar participants to explore nutrient recycling within their own contexts. The seminar was highly interactive, giving participants possibilities to share own experiences and to develop their knowledge within this field through exchange with fellow seminar participants. This seminar was part of World Water Week 2012.

2. Blackwater treatment and reuse
in practice in Södertälje, Sweden
Sunita Hallgren
Federation of Swedish Farmers (LRF)
Policy advisor waste recycling
Karl-Axel Reimer
Södertälje Municipality
Environmental manager
Anna Calo (not present)
Telge Nät AB
Project manager

3. Either through organic waste from
the food chain
or as new raw material from
the crust of soil (P, S, K, Mg)
or from air (N).
Each year a lot of plant nutrients are transported from swedish farms as
cereals, potatoes, vegetables, meat and milk into the cities
These nutrients must somehow be replaced!
WWhy circulation of wastewater products?
hy circulation wastewater products?

4. LRF’s view is that we in a sustainable society must circulate the
plant nutrients back to agricultural land. Sustainability is crucial,
and reuse of phosphorus, nitrogen and organic matter is an
important step in right direction.

5. - put the quality of the ”waste” in focus!
How much pollution can the water withstand?
(purification)
From:
How to maximize the management of nutrients?
(conservation)
To:
LRF want a new approach in our society

6. Extremely low flush toilets, blackwater to closed tank +
householdwater- purification through sandfilter
- we get concentrated blackwater in the closed tank
Small sewage - sorting systems in rural areas

7. Södertälje municipality
85 000 citizens

8. A collection and treatment system
for recycling of nutrients from
organic waste and wastewater in a
sensitive rural area
anna.calo@telge.se
+46 (0) 8-550 221 26

9. Treatment plant for 500 households based on two methods for
sanitisation
• Sanitisation by urea treatment
When urea is converted to ammonia
the pH in the sludge increases,
which leads to reduction of
pathogens in the sludge.
Addition of urea increases the
nitrogen quantity in the manure.
Two-four weeks depending on the
amount of urea added and the
pre-heating temperature.
Well sealed treatment tanks with
compost filter for pressure
equalization. The filters reduce
odours and catches possible
ammonia.
• Wet composting
Collection of black water from
septic tanks and organic waste
connected to extremely efficient
water saving systems.
Collection of organic waste and
manure.
- Aerobic thermophilic process
(wet composting process),
where the materials reach at
least 52 °C during a minimum of
10 hours. 2 weeks
- Preheat to about 40 °C for , 1
week
Aeration is supplied by an
immersed ejective aerator.

10. Wet composting and Urea treatment for a safe
reuse of toilet waste in agriculture

11. Supervision in Södertälje on small
wastewater treatment plants
• The environmental act
• Strive to close the loop
• Highly eutrophicated area
• Supervision is related to local agriculture
• Local policy for ecosanitation

12. Man made wetlands
(protecting lakes and rivers)Protection of the river
Farming
(closing
the loop
for plant
nutrients)
Sustainable wastewater treatment is:
Keeping and safely use the nutrients on land!

13. Local municipal policy/guidlines for
Ecosanitation in Södertälje
• Treating the black water separately
• Minimal use of water
• Safe system for hygienization
• Suitable system for agriculture

14. Experiences
• Economical challenges
• Acceptance of new technique
• It´s a solid system. No complicated process for
the household to control/supervise

15. Urban and rural areas must be linked
together…food in – nutrients back!