Anaerobic Co-Digestion of Cattle Manure and Raw Algae: Kinetic Study and Optimization of Methane Potential by RSM
Arwa Abdelhay 1  
,   Lilian Al-Hasanat 2  
,   Abeer Albsoul 3  
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Civil and Environmental Engineering Department, German Jordanian University, Amman 11180 Jordan
Engineer, Environmental and Renewable Energy Engineering, German Jordanian University, Amman 11180 Jordan
Department of Chemical Engineering, Al-Huson University College, Al-Balqa Applied University, Irbid, Jordan
Arwa Abdelhay   

Civil and Environmental Engineering, German Jordanian University, Amman Madaba Street P.O. Box 35247 Amman 11180 Jo, 11180, Amman, Jordan
Submission date: 2020-05-10
Final revision date: 2020-07-14
Acceptance date: 2020-07-18
Online publication date: 2020-11-20
Publication date: 2021-01-20
Pol. J. Environ. Stud. 2021;30(2):1029–1037
This paper investigated anaerobic co-digestion of cattle manure and raw algae with and without adding activated sludge as co- substrate and under different substrate ratios. The results showed that the co-digestion of cattle manure with raw algae led to a maximum methane yield of 294 mL/g VS at a CM:A ratio of 70%:30%. While co-digestion of cattle manure and raw algae diluted with tap water under CM:A ratio of (70%:30%) resulted in a methane yield of 97 mL/g VS. In the co-digestion runs conducted with the same feedstock and inoculated with activated sludge, little methane was produced. The values of pH and (N-NH3) showed no inhibitory effect. The kinetic study revealed that the maximum methane yield was 32.4 (mL/g VS.d), 332 (mL methane/g VS) respectively. The lag time ranged from 0 to 3 days. The Response surface methodology showed that methane production could be represented by a second-order polynomial.