Abstract:
The term bio-solid was introduced in the early 1990 to designate the solid semi-solid or liquid
materials generated from the treatment of domestic sewage that has been sufficiently processed
to be safely land applied. The physic-chemical properties bio-solid waste of Debre Berhan were
1.54 mS/cm, 3.32%, 35.8%, 5.93, 11.27%, and 61.72% for sample, A for, EC, TN%, OC, pH,
C:N, OM, 1.67mS/cm, 3.13%, 11.27%, 5.63, 60.79%, 35.26%.For EC, TN%, C:N%, pH, OM,
OC. For sample B and 5.62, 26.44%, 2.36mS/cm, 3.13%, 8.45%, 45.56%. For PH, OC%, EC,
TN% and OM respectively for sample C. In general the study revealed that the bio-solid waste
has high OM, OC, TN, C: N, and low EC and P low concentration of heavy metals of (Pb, Cu,
Ni, Zn, Cd) that meets the ceiling concentration limit of Rule 503 that was set by US EPA for
using the bio-solid waste for land use as a fertilizers and high concentration of heavy metals of
(As, Hg). In addition to this, the bio-solid waste has high concentration of primary nutrients of
potassium, nitrogen and phosphorus. However the low pH of the bio-solid waste indicates that,
the bio-solid is slightly acidic and application of it on the land needs further treatment or it is
better to use it on the less acidic soil
