The nitrifying rate of Sequencing Batch Reactor when apply bio-carrier the Biochip to municipal wastewater treatment

Abstract

All around the world, the biofilm is the typical method for modification the municipal and industrial wastewater treatment plant. In the activated sludge reactor, the biofilm carries more suspended bacterial through the attached and growth of microorganisms on the surface of bio-carrier. Therefore, the article evaluates the performance of bio-carrier Biochip 25 in the Sequencing Batch Reactor (SBR) – a variation of activated sludge and has been wide applied in municipal wastewater treatment plant. The experiment proceeded in 2 phases, based on 2 main kind of pollutants in wastewater: 1. Organic matters in typical model SBR; and 2. Nutrients, especially ammonia – nitrogen in modification model with anoxic step. The quality of treated water from the model SBR with Biochip shows that, the efficiency of biological treatment stabilizes in range 80 – 90% with organic matter and 75 – 85% with Ammonia – Nitrogen. In modification model SBR, the specific denitrification rate stabilizes in range 0.3 – 0.4 Nred/kg sludge/day and the nitrification rate in range 0.18 – 0.20 kg Nox/kg sludge/d. Moreover, the specific rate and the balance of nitrogen in reactor got optimal value when the ratio of loading rate from 1.5 – 2.5 kg BOD †TKN/kg sludge/day.