Interaction between suspended and settled solid particles in cassava wastewater
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Description
Cassava (Manihot Esculenta, Crantz) is a very important staple food in most developing countries.
During its processing into cassava flour or garri, wastewaters are generated and are indiscriminately
discharged into the public sewers or into the environment and in some cases; the fermented
wastewater is usually poured into latrines with the aim of degrading sewage. This study is aimed at
finding out the interaction between the suspended solids and settled solids of cassava wastewater.
Cassava wastewater was collected from a cassava processing plant at Ogige main market in Nsukka
town and monitored for 14 days. Half of the samples collected were left unstirred and the other halves
were continuously stirred. The parameters monitored include biochemical oxygen demand (BOD5),
suspended solids, coliform, cyanide and pH. Results showed that there was a 73.4, 27.5 and 99.9%
reduction in the settled solids for BOD5, suspended solids and coliform bacteria respectively, for the
stirred samples while there was a 97.8, 44 and 99.9% reduction in the settled solids for BOD5,
suspended solids and coliform bacteria respectively, for the unstirred samples. Overall, the unstirred
samples performed better than the stirred samples with respect to BOD5 and SS removal. The result of
this work will guide sanitary engineers in the selection of influent parameters for the effective design of
treatment units.
Keywords
TA Engineering (General). Civil engineering (General)