Hydrogen Sulphide Elimination from Biogas
by Ruben Zahlten,TED, Lesotho, and Christopher Kellner, WASAZA, Zambia

During its six year history Technologies for Economic Development (TED) has constructed over 120 DEWATS and biogas systems, the majority of which deal with wastewater treatment.  In some cases the digesters are fed with sewage and animal manure which increases gas production considerably. 



Fig 1: Zhong Zhao Brand JZT Desulfurization Tank, test setup at client’s home.

When the biogas is used for cooking the presence of Hydrogen Sulphide (H₂S) results in an unpleasant smell and causes the cast iron burner parts in direct contact with the biogas to corrode faster.  This is particularly the case when pig manure is added as increased production of H₂S occurs.

Water and Sanitation Association of Zambia (WASAZA)’s first DEcentralised WAsteWater Treatment System (DEWATS) project in Zambia
by Mulenga Kabwe, WASAZA, Zambia

In close cooperation with Pestalozzi World, the German Toilet Organization (GTO) and local partners, WASAZA has been able to implement its first DEWATS project;  a sustainable sanitation concept at a peri-urban school in Lusaka, capital city of Zambia. The project contributes to a healthier and more dignified learning environment for more than 2000 school children and will set a good example for further projects. 

An example of Ecological Sanitation
by Christopher Kellner, WASAZA, Zambia

The Fertilizer Producing Toilet is an example of Ecological Sanitation.  Ecological sanitation (ECOSAN) is an approach in which the nutrients from human and animal waste are recycled.

The toilet is designed to suit conditions where either digging a pit is difficult or where a dug-out pit without lining would collapse easily.  It is aimed at providing a user-friendly approach to the utilization of by-products. The toilet prevents nutrients originating from urine (88%) and excreta (12%) trickling into the underground water body.

Sanitation Champion Award: 19 November 2009
by Kabwe Mulenga, WASAZA, Zambia

Sanitation is a neglected issue but a crucial aspect of poverty and deprivation.  World Toilet Day is held annually to draw attention to this vital part of life.
 
PICTURE 1: Chief Macha showing off his award to his subjects and delegates who had assembled in his chiefdom to celebrate World Toilet Day

Worldwide 2.5 billion people are without access to proper sanitation which endangers their health, strips their dignity and kills 1.8 million people, mostly children every year. 

Suggestions on the concept of gas connection for the P-Locsan Project
by Christopher Kellner, WASAZA, Zambia















The Pilot Projects on Low Cost Sanitation (P-Locsan), operated by the Devolution Trust Fund (DTF,) are considering the implementation of a technical innovation at all four sites (Kariba in Ndola, Kandundu in Solwezi, Kansuswa in Chingola and Libuyu in Livingstone). 
This is the introduction of biogas plants used as intermediate settlers in the sewage transportation system (sewerage network).