St. Mary’s Hospital, Uganda – A major order is realized

Around 4000 people are staying in St. Mary’s Hospital in Lacor, Gulu, Uganda per day-patients, medical staff and visitors. The Hospital has water supply facilities, which get their water from a number of wells.  The waste water is collected by a central sewer system and is going to be poorly cleaned in the wastewater lagoons.  Especially this insufficient preparation of the wastewater requires action.

An efficient waste water preparation is important, because without it, it would be impossible to eliminate the pathogens in the waste water.  Since there is the danger that resistant pathogens get from the groundwater into the drinking water. And because of that cause a disease cycle: The bacteria contaminated water is going to be pumped out of the well and gets like this back in the human body. This cycle should be stopped, so that no water based diseases could expand. The supply with clean water and the access to appropriate sanitation systems are the main challenges in this development cooperation.  The enhancement of sanitation and water supply is an important component in the fight against poverty and the destruction of the environment, which is also said in the Sustainable Development Goals of the UN, as well as in the Laudato Si, the environment encyclical of the pope.


Dipl.-Ing. Josef Sperrer, a civilian engineer, planed the order of Horizont 3000 the plants for an improvement of the water supply, the use of rainwater and the preparation of wastewater according to legal requirements.  After solutions were found and the planning was coordinated together with local decision makers, the needed jobs were publicly advertised. The BBM could win this tender as the best and cheapest supplier and was instructed to realize these actions.

High-quality wastewater treatment with overgrown soil filter

So far the wastewater in St. Mary’s Hospital was directly brought to the wastewater lagoons without any preclearing, so that they silted as a result. From now on the wastewater is mechanically cleaned in a sedimentation tank with a usable volume of 300 m³. The sludge, which is settled down in the tank, is going to be pumped away and used for agriculture.

Coarse materials are hold back in the sedimentation tank

The wastewater lagoons clean the water only insufficient. To clean the 200 m³ wastewater per day according to legal requirements an overgrown soil filter with approx. 850 m² patch surface was constructed. This soil filter is a combination of biological sewage plant, trickling filter and a solid reactor.  The wastewater is gets intermittently to the biological level and is sprayed by an extensive laid piping on to the surface.

Underground Rainwater storage tank

In the hospital the rainwater is used for the lab and the washing facilities. For the storage of the rainwater underground tanks per 50 m³ usable volume were built.The plants were built very professional by local experts.

Norbert Demmelbauer: „We have worked with Dominic Ocaka and his employees since years. Because of his great competence, he makes the realisation of this project a lot easier.”

Water supply – Priority: Leak removal

The check at the water supply network showed that around 30 % of the transported drinking water gets lost because of various leaks. Mainly dripping fittings, old sealing but also regular leaks could be found. Alain, an Austrian plumber, trained the local plumbers. From now on local plumbers could do the necessary work themselves.

Completely renewed sanitary rooms

Due to the efficient use of available materials, a sanitation area could be completely renewed. For the first time built in cisterns were used. And also the partly corroded iron pipes were renewed.
The experts of BBM set together with Josef Sperrer new standards for the wastewater cleaning. The newly developed overgrown soil filter can clean large amounts of wastewater with a high quality and is suitable to upgrade insufficient plants.



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