Wet air oxidation as a pretreatment option for selective biodegradability enhancement and biogas generation potential from complex effluent.
This study looks at the possibility of wet air oxidation (WAO) based pretreatment of complex effluent to selectively enhance the biodegradability (without substantial COD destruction) and facilitate biogas generation potential. A lab-scale wet air oxidation reactor with biomethanated distillery wastewater (B-DWW) as a model complex effluent (COD 40,000 mg L(-1)) was used to demonstrate the proof-of-concept. The studies were conducted using a designed set of experiments and reaction temperature (150-200°C), air pressure (6-12 bar) and reaction time (15-120 min) were the main process variables of concern for WAO process optimization. WAO pretreatment of B-DWW enhanced the biodegradability of the complex wastewater by the virtue of enhancing its biodegradability index (BI) from 0.2 to 0.88, which indicate favorable Biochemical Methane Potential (BMP) for biogas generation. The kinetics of COD destruction and BI enhancement has also been reported.
Environmental Biotechnology Division, National Environmental Engineering Research Institute, Nehru Marg, Nagpur, Maharashtra, India.
K V
KV
Padoley
P D
PD
Tembhekar
T
T
Saratchandra
A B
AB
Pandit
R A
RA
Pandey
S N
SN
Mudliar
D000388:Air; D000693:Anaerobiosis; D001673:Biodegradation, Environmental; D056804:Biofuels / Q000032:analysis*; D057919:Biological Oxygen Demand Analysis; D019149:Bioreactors; D001709:Biotechnology / Q000379:methods*; D005232:Fatty Acids, Volatile / Q000032:analysis; D006813:Humidity; D007220:Industrial Waste / Q000032:analysis; D007700:Kinetics; D009682:Magnetic Resonance Spectroscopy; D008697:Methane / Q000032:analysis / Q000378:metabolism; D008962:Models, Theoretical; D010084:Oxidation-Reduction; D011312:Pressure; D017550:Spectroscopy, Fourier Transform Infrared; D013696:Temperature; D014865:Waste Disposal, Fluid; D062065:Wastewater / Q000737:chemistry
D056804:Biofuels; D005232:Fatty Acids, Volatile; D007220:Industrial Waste; D008697:Methane; D062065:Wastewater