Some kind of high concentration wastewater has great potencial for treatment and recovery of energy by means of anaerobic digestion.
A study on thermophilic anaerobic digestion using methanol synthetic wastewater was performed with a membrane separation process. The operation tests were investigated using a fixed-bed reactor packed with porous pumice stone and ultra-filtration (UF) membrane module for microbial retention.
The results of continuous experiments revealed that : 1) the nutrients require were BOD : N : P=100 : 0.7 : 0.1, 2) the hydraulic retention time was 0.56 day 3) the maximum BOD volmetric loading rate was 69.5 g-BOD·l-1·d-1, 4) the average BOD removal rate was 99.5%, and 5) the circulated VSS in the bioreactor with a UF membrane was highly concentrated and had a high efficiency of methanol consumption and gas production.
