Use of respirometer in evaluation of process and toxicity of thermophilic anaerobic digestion for treating kitchen waste.
A thermophilic anaerobic digestion (TAnD, 55 degrees C) system was adopted to hydrolyze the kitchen waste for 3 days, which was then fermented for a hydraulic retention time (HRT) of 10 days. The TAnD system performed much better than a similar system without thermal pre-treatment. A bubble respirometer was employed to study the effects of thermal pre-treatment, which showed that pre-treatment at 60 degrees C yielded the highest Total COD (TCOD) removal efficiency (79.2%) after 300h reaction. Respirometer results also indicated that oil and grease (O and G) began to inhibit the TAnD system at a concentration of approximately 1000mg/L and the gas production was inhibited by 50% at a concentration of approximately 7500mg/L of sodium.
Kuo
Wen-Chien
WC
Department of Environmental Science and Engineering, National Pingtung University of Science and Technology, 1 Hseuh Fu Road, Nei Pu, Pingtung 91207, Taiwan. xwck@mail.npust.edu.tw
Cheng
Kae-Yiin
KY
D000693:Anaerobiosis; D001421:Bacteria, Anaerobic / Q000378:metabolism*; D019149:Bioreactors / Q000382:microbiology*; D005069:Evaluation Studies as Topic; D005735:Garbage; D006868:Hydrolysis; D012037:Refuse Disposal / Q000295:instrumentation* / Q000379:methods; D012722:Sewage / Q000737:chemistry / Q000382:microbiology*; D013696:Temperature; D013997:Time Factors
D012722:Sewage