Development of compact UASB/trickling filter systems for treating domestic wastewater in small communities in Brazil

摘要

The paper analyses the concept and performance of compact UASB/TF systems in relation tonconfiguration, use of innovative packing media and operational conditions. For the conditionsntested, the UASB/TF systems had consistently complied with the Brazilian discharge standardnregarding to COD, BOD and TSS parameters. However, some enhancements are still necessary innorder to increase nitrification in the process. The conditions to promote nitrification in shallow TFn(packed bed up to 2.50m height) seem to be compatible with the proposed simplification in thenflowsheet, which is to operate the system without secondary clarifiers.