Technological Characteristics Anammox ASBR Reactor And Controlling

The start-up of ANAMMOX process using a sequencing batch reactor was investigated and the characteristics and control strategies during start-up were explored. Furthermore, process control strategies were also analyzed from two aspects of substrate control and environment control. ANAMMOX phenomenon was observed after17days with the end of cell lysis phase. Thus, by the material balance, daily production of ANAMMOX bacteria was more than denitrifying bacteria. The granular red-brown ANAMMOX sludge was obtained after100-day start-up. After the ANAMMOX reactor was successfully started-up, the analysis of the effects of substrates concentrations indicated that the ANAMMOX process was inhibited when the nitrite concentration was higher than240mg/L. The analysis of the operation process indicated a good correlation between NH4+-N removal rate and the value of△pH·Q. Therefore, the pH was simple indicator of ANAMMOX performance. The oxidation-reduction potential (ORP) was tried to be as parameter for indicating the performance of the ANAMMOX reactor, and the results showed that a good correlation between ORP and pH. Simultaneously, ORP was used to describe the trend of the varied NH4+-N removal rate, and the delay time of nitrogen removal obtained from the’turning point’ of the ORP curve.To investigate the kinetics characteristics of nitrogen removal at single cycle under pseudo-steady-state condition, the kinetics characteristics of inhibition period and the most suitable models obtained from the process. The kinetics characteristics of nitrogen removal at single cycle of ANAMMOX process under pseudo-steady-state condition was first evaluated in this paper. The results showed that the modified Logistic model and the modified Boltzmann model were found to be the appropriate models to describe the performance of the ASBR at single cycle under pseudo-steady-state condition. Moreover, the effluent total nitrogen and the total nitrogen removal at any time of the cycle were obtained. The relationship between the effluent FA and the TN RR and the relationship between the effluent N02--N and the TN RR were established by the Haldane model and the Aiba model, suggesting the Haldane model was more appropriate to predict the values. According to Haldane model, the inhibition concentrations of the effluent FA and the effluent N02--N were suggested as72.36mg/L and140.60mg/L, respectively. These models and the parameters from these models might be used in predicting the behavior or design of the ASBR. The purpose of this study was to investigate the characteristics of ANAMMOX activity under moderately and low temperatures. The results showed that the ANAMMOX process depended less sensitively, when the temperature was higher than18 C℃Considering the economic costs and nitrogen removal, the reactor could be maintained a stable state at18℃. Whereas, when the temperature was lower than18℃for a long time, the destabilization of the biological system occurred, insulation measures were recommended to maintain the system temperature to18℃, in order to maintain system stability.These results might be contributed to extend the applicability of the Anammox process operated under cold weather conditions.