Start Up of Two-stage Up-flow Anaerobic Sludge Blanket and Sequencing Batch Reactor in Treating Municipal Landfill Leachate

A two stage up-flow sludge blanket(UASB) and sequencing batch reactor(SBR) system was used to treat municipal landfill leachate and took high efficiency in the removal of nitrogen.Raw leachate was diluted with tap water in different proportions and the influent was increased by four phases,high-efficiency treatment was achieved when start-up was finished.In the study,the UASB1 has two significant effects:firstly,denitrification reaction of high efficiency was conduct for SBR nitrified effluent recirculated by using the abundant organic matters in the raw leachate as carbon source,secondly,it removal COD highly effectively by anaerobic biodegradation.When COD concentration was from 3.5 g /L to 12 g /L,COD rem 1.20 g /L,the effluent NH ₄⁺ N removal efficiency was maintained around 99%.Besides,total nitrogen(TN) removal efficiency could reach 85% with the effluent TN lower than 15 mg /L.