Investigating Electrocoagulation as an Alternative Treatment Method for Wastewater from Slaughterhouses in Kenya

  • Lilian K. Mulimi
  • Patrick G. Home
  • Joseph S. Chacha
  • Daniel O. Siringi

Abstract

Wastewater treatment is a costly process that mostcompanies, particularly the small ones often shun. In Kenya,wastewater from slaughterhouses is usually discharged into waterbodies untreated or directed to other treatment units where it causesmany problems due to its characteristics as it is highly concentratedwith organic and colloidal materials. Discharge of this water intowaterbodies causes pollution which affects water quality and aquaticlife, eutrophication, and water treatment problems. In addition, thecommonly used sewage treatment process is still far from beingenvironmentally sustainable. Exploring and developing alternativewater treatment techniques that are cheaper and more effective hastherefore become necessary in Kenya. This study sought toinvestigate electrocoagulation as an alternative method forwastewater treatment. The purpose was to establish an effective,cheaper and more environmental friendly method of treating waterfrom slaughterhouses. The elctrocoagulation process involved use ofiron and aluminium electrodes of different surface areas and varyingelectrical voltages. Samples of raw slaughterhouse effluent as well asthose of treated water were taken and tested for the following usingstandard procedures; Biological Oxygen Demand, Turbidity,Chemical Oxygen Demand and Total Suspended Solids. The resultsdemonstrated that electro-coagulation is able to reduce all theseparameters in wastewater to levels that meet the Government ofKenya Standards for treated wastewater and effluent discharge intothe environment. Electrocoagulation was able to reduce BOD, COD,TSS and turbidity to 20.78mg/l, 16.33mg/l, 2.33mg/l and 2 NTUfrom 1278mg/l, 1475mg/l, 405mg/l and 978 NTU respectively atvoltage of 25V and surface area of 90 cm2 with iron electrodes and40 cm2 when aluminium electrodes were used. Electro-coagulation istherefore an effective method for treating wastewater fromslaughterhouses.
Published
Feb 19, 2020
How to Cite
MULIMI, Lilian K. et al. Investigating Electrocoagulation as an Alternative Treatment Method for Wastewater from Slaughterhouses in Kenya. Proceedings of Sustainable Research and Innovation Conference, [S.l.], p. 142-150, feb. 2020. ISSN 2079-6226. Available at: <http://sri.jkuat.ac.ke/ojs/index.php/proceedings/article/view/874>. Date accessed: 06 apr. 2020.