Optimization of co-digestion of various industrial sludges for biogas production and sludge treatment: methane production potential experiments and modeling.
Optimal biogas production and sludge treatment were studied by co-digestion experiments and modeling using five different wastewater sludges generated from paper, chemical, petrochemical, automobile, and food processing industries situated in Ulsan Industrial Complex, Ulsan, South Korea. The biomethane production potential test was conducted in simplex-centroid mixture design, fitted to regression equation, and some optimal co-digestion scenarios were given by combined desirability function based multi-objective optimization technique for both methane yield and the quantity of sludge digested. The co-digestion model incorporating main and interaction effects among sludges were utilized to predict the maximum possible methane yield. The optimization routine for methane production with different industrial sludges in batches were repeated with the left-over sludge of earlier cycle, till all sludges have been completely treated. Among the possible scenarios, a maximum methane yield of 1161.53 m(3) is anticipated in three batches followed by 1130.33 m(3) and 1045.65 m(3) in five and two batches, respectively. This study shows a scientific approach to find a practical solution to utilize diverse industrial sludges in both treatment and biogas production perspectives.
Center for Clean Technology and Resource Recycling, University of Ulsan, Ulsan, Republic of Korea.
Biswanath
B
Mahanty
Center for Clean Technology and Resource Recycling, University of Ulsan, Ulsan, Republic of Korea.
Mohd
M
Zafar
Department of Civil and Environmental Engineering, University of Ulsan, Ulsan, Republic of Korea.
Man Jae
MJ
Han
Center for Clean Technology and Resource Recycling, University of Ulsan, Ulsan, Republic of Korea; Department of Civil and Environmental Engineering, University of Ulsan, Ulsan, Republic of Korea. Electronic address: parkhs@ulsan.ac.kr.
Hung-Suck
HS
Park
D000693:Anaerobiosis; D056804:Biofuels / Q000032:analysis*; D007220:Industrial Waste / Q000032:analysis; D008697:Methane / Q000378:metabolism*; D008962:Models, Theoretical; D056910:Republic of Korea; D012722:Sewage / Q000032:analysis*; D014865:Waste Disposal, Fluid; D062065:Wastewater / Q000032:analysis*
D056804:Biofuels; D007220:Industrial Waste; D008697:Methane; D012722:Sewage; D062065:Wastewater
Biogas production; Co-digestion; Combined desirability function; Industrial sludge; Optimization