To examine the stability of carrier anaerobic baffled reactor(CABR)treating low concentration domestic sewage

the macroscopic performance

catabolic intermediate and microbial activities of CABR were investigated at different hydraulic retention times(HRTs)and different temperatures.The results showed that: ① The change from “L” shape to “\” shape of the TCOD removal curve throughout the reactor suggested qualitatively the decline of shock resistance potential

and the invariability of volumetric removal rate with increasing shock load indicated quantitatively the shortage of buffer capacity.② The increase of the ratio of soluble microbial products(SMP)/ soluble chemical oxygen demand(SCOD)along the flow-direction and the ratio of volatile fatty acid(VFA)/alkalinity less than 0.11 implied excellent potential of shock resistance.③ The decline of shock resistance could be indicated by the decrease of microbial activities.It was also demonstrated that CABR showed the best shock resistance potential at 28℃ but the worst potential at 10℃.The stability of CABR under short-term hydraulic shock load declined as temperature decreased.