Simulation and applications of a novel modified SBR system for biological nutrient removal

Abstract

Dynamic simulation and applications of a novel, continuous-fed, constant level modified sequencing batch reactor for biological nutrient removal are presented. The underlying mathematical model and practical applications of the simulation are discussed. Case studies are presented to illustrate the applications as well as the flexibility of the system in meeting different wastewater treatment requirements. Operation experience from full-scale wastewater treatment plant demonstrates the reliability, ease of operation and high efficiency of the system. Average BOD5, total nitrogen, total phosphorus and TSS removals of 97, 81, 88 and 94% are achieved respectively on an annual basis with little operator attention. Consistently high waste activated sludge concentrations are demonstrated, averaging approximately 20,000 mg/L.

Activated Sludge – 100 Years and Counting

“…Several types of hybrid or modified SBR configurations exist that combine the advantages of continuous influent/effluent flow and constant liquid level of a CAS system with the properties of flexibility and compactness of SBRs (Wu et al, 2001), for example the UNITANK ® approach. This system consists of a tank divided into three equal-volume compartments ('1', '2' and '3') each equipped with aeration and mixing.…”

Progress in the Development of Control Strategies for the SBR Process

“…This model, which was established according the correlation of ammonia load and aeration time, linked a three layer settler model in order to optimize aeration period time and to reduce the energy consumption. Some modified or simplified ASM models were applied in modified SBR processes, e.g., UNITANK [28], cyclic activated sludge system (CASS) [29], and modified sequencing batch reactor (MSBR) [30].…”