Abstract:

The performance stabilities of different ANAMMOX (Anaerobic Ammonium Oxidation) reactors were quantitatively compared and investigated by means of statistic and fuZZV mathematical methods. The resuIts show that,for the reactors with the same confguration,the tolerance to the shock load is greatly affected bv the load type,that the stability parameters of the reactor under the subsh-ate shock load are 1.68 to 5.44 (2.9 in average 1 times those of the reactor under the hydraulic shock load, that the ANAMMOX reactors are m0re tolerant to the hydraulic shock load than to the substrate shock load, that the reactors with different configurations displav different performance stabilities under the same load ,and that the granular sludge bed stands the first in the stabilitv under the substrate shock load, followed by the biofilm reactor and the SBR (Sequencing Batch Reactor).However,SBR takes the first place under the hydraulic shock load,followed by the granular sludge bed and the biofilm reactor.Moreover,the results of fuzzy assessment indicate that the granular sludge bed is most stable t0 the shock load.while SBR is the most unstable of the three reactors.

Key words: anaerobic ammonium oxidation, performance stability, fuZZV assessment