Abstract
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 is integrated with various units-biodigester, 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 (BOD5), chemical oxygen demand (COD), ammonium, and nitrate, respectively. After conducting effective plant operations for five months, the removal efficiencies of BOD5, COD, ammonium, and nitrate improved to 97.4%, 98.3%, 97.4%, and 97.6%, respectively. In the present study, the unit-by-unit performance values achieved as a result of alterations to the facility's running conditions are presented. The MCS wastewater treatment facility was found to be energy-positive, as it produced an average of 158.2 m3 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 Bureau of Standards (TBS).
Highlights
Background informationMeat industry generates huge volumes of wastewaters that come from cleaning of slaughterhouse facilities, meat processing, and cleaning of animal carcasses (Bustillo-Lecompte & Mehrab 2015)
The present study shows that the integrated biodigester-CW system performed well in the removal of chemical oxygen demand (COD) (98.3%), BOD5 (97.4%), total suspended solids (TSS) (99.6%), NHþ4 (191.0%), faecal coliform (99.1%), NOÀ3 (93.3%), Table 7 | The five months’ overall performance of the integrated biodigester-constructed wetland for removal of environmental pollutants
To solve the energy issues at the study site, the present study is recommending that the Mwanza City Council (MCC) should invest in an energy conversion system to benefit from the biogas produced
Summary
Meat industry generates huge volumes of wastewaters that come from cleaning of slaughterhouse facilities, meat processing, and cleaning of animal carcasses (Bustillo-Lecompte & Mehrab 2015) The volume of these wastewaters being released into the receiving environment has increased over the years due to increased meat production to meet protein requirements of growing human populations (Emmanuel et al 2016). Slaughterhouse wastewater contains biodegradable suspensions, colloidal particles, organic matter, fats, and cellulose that usually contribute to elevated levels of chemical oxygen demand (COD) and biochemical oxygen demand (BOD) (Shujun et al 2015) These materials can eventually reduce the amount of dissolved oxygen (DO) in the receiving aquatic environments (Sunder & Satyanarayan 2013). The World Bank (WB) funded the construction of the slaughterhouse wastewater treatment facility through the Lake Victoria Environmental Management Project (LVEMP)
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