Performance investigation of the slaughterhouse wastewater treatment facility: a case of Mwanza city slaughterhouse, Tanzania
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Date
2021-01
Authors
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Journal ISSN
Volume Title
Publisher
NM-AIST
Abstract
The present study engaged onsite operations and laboratory analysis for Mwanza City
Slaughterhouse (MCS) wastewater to improve the efficiency of wastewater treatment of a
newly installed facility. The MCS wastewater treatment facility integrated with various unitsbiodigester
(Batch Stirred Tank Bio-reactor), aeration unit, retention, clarifier, and a
constructed wetland. During the initial runs, the MCS facility removed 87.5%, 92.2%, 43%,
and 65.4% of effluent biochemical oxygen demand (BOD
5
), chemical oxygen demand
(COD), ammonium, and nitrate, respectively. Also, the parameters including pH, temperature,
dissolved oxygen (DO) were used to control the system operations. After conducting effective
plant operations for five months, the removal efficiencies of BOD
5
, COD, ammonium, and
nitrate improved to 97.4%, 98.3%, 97.4%, and 97.6%. In the present study, the unit-by-unit
performance values achieved as a result of alterations of the facility‟s running conditions
presented. The MCS wastewater treatment facility found to be energy-positive, as it produced
an average of 158.2 m
3
biogas per day. This amount of biogas, if converted to electricity,
would be sufficient to run the facility operations. Generally, the MCS wastewater treatment
facility attained the best performance as per design, achieving the effluent levels
recommended by the Tanzania Standards (TZS). Also, the MCS treatment facility takes care
of the environment and human health because of effluents released to the surrounding area are
now within recommended standards.
Sustainable Development Goals
A Dissertation Submitted in Partial Fulfillment of the Requirements for the Degree of
Master’s in Hydrology and Water Resources Engineering of the Nelson Mandela African
Institution of Science and Technology
Keywords
Research Subject Categories::NATURAL SCIENCES