Anaerobic baffle reactor;  hydraulic characteristics;  residence time distribution;  Impulse stimulus response method

Anaerobic baffle reactor (ABR) is a new type of high-efficiency wastewater treatment equipment with great application prospects, and hydraulic characteristics are important factors affecting its treatment efficiency. The flow state of the ABR reactor was characterized by NaCl as tracer, and the RTD curve and hydraulic characteristic parameters of the ABR reactor under several HRT were tested, and the influence of HRT on the number of hydraulic dead band volumetric integrals and cascade models was analyzed. The results show that when the HRT of the ABR reactor changes at 1~9 h, the number of dead band passenger integration is less than 0.30, and it is between 0.068~0.299.