Photocatalytic oxidation of dairy effluent with UV lamp or UV light-emitting diode module and biological treatment processes

  • J.-C. Su
  • Y.-L. Wang
  • J.-J. SuEmail author
Original Paper


The objective of this study was to develop a novel and simple-operated treatment system for refining dairy farm effluent after conventional dairy wastewater treatment system. Experimental results showed that average removal efficiency of COD, BOD, and SS in the effluents of a dairy farm was 72, 98, and 79%, respectively, using a combined photocatalytic and biological reactors. Removal efficiency of calculated conductivity value seems to be closely related to the removal efficiency of NH4+, PO43−, and Mg2+ when using the photocatalytic UV lamp reactor only. However, average removal efficiency of COD, BOD, and SS in the dairy farm effluent was 53, 62, and 62%, respectively, with the photocatalytic UV LED reactor. In summary, removal efficiency of BOD, COD, SS, and EC in photocatalytically treated dairy farm effluent with UV lamp reactor was higher than that with photocatalytic UV LED reactor. In addition, removal efficiency of COD and BOD with a combined photocatalytic and biological treatment system was higher than that using a photocatalytic oxidation reactor only. Thus, the combined system can provide dairy cattle farmers to refine and recycle their effluents.


Dairy wastewater Photocatalytic oxidation Lignin Biodegradation UV radiation Light-emitting diode 



The study was made possible by grants (Project No. NSC 1O1-3111-Y-466-010) awarded from the National Science Council (NSC), Executive Yuan, Taiwan, R.O.C. The authors also thank Mr. Cheong Hong Hoi for proof reading.


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Copyright information

© Islamic Azad University (IAU) 2018

Authors and Affiliations

  1. 1.Department of Electronic and Computer Engineering, Graduate Institute of Electro-Optical EngineeringNational Taiwan University of Science and TechnologyTaipeiTaiwan, ROC
  2. 2.Department of Animal Science and TechnologyNational Taiwan UniversityTaipeiTaiwan, ROC
  3. 3.Bioenergy Research Center, College of Bioresources and AgricultureNational Taiwan UniversityTaipeiTaiwan, ROC

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