In this study, a lab-scale Partial Nitritation Sequencing Batch Reactor (PNSBR) was implemented for treating high-ammonium old landfill leachate to yield an appropriate NO2 —N/ NH4 + -N ratio from 1/1 to mixture as a pretreatment for subsequent Anammox. The objective of this study was to determine. | TAÏP CHÍ PHAÙT TRIEÅN KH&CN, TAÄP 19, SOÁ M2- 2016 Partial nitritation treating nitrogen in old landfill leachate Phan The Nhat, Truong Thi Thanh Van, Le Thanh Son, Ha Nhu Biec, Nguyen Phuoc Dan Faculty of Environment and Natural resources, Ho Chi Minh city University of Technology - Vietnam National University – Ho Chi Minh City (Received 15 September 2016, accepted 10 November 2016) ABSTRACT 210 days. The experimental results showed that In this study, a lab-scale Partial Nitritation with the influent ammonia concentrations of Sequencing Batch Reactor (PNSBR) was 500, 1000, 1500 and 2000 mg/L, HRT is 12 h, implemented for treating high-ammonium old 21 h, 30 h and 48 h, respectively. The range of landfill leachate to yield an appropriate NO2—N/ + free ammonia (FA) concentration from 17 to 44 NH4 -N ratio from 1/1 to mixture as a pretreatment for subsequent Anammox. The mg/L completely inhibited nitrite oxidizing objective of this study was to determine the bacteria (NOB) for long time operation. The optimal hydraulic retention time (HRT) at COD removal efficiency was very low (6±2) %. different influent ammonia concentrations for Keywords: Partial nitritation; old landfill leachate; AOB; SBR; NOB. 1. INTRODUCTION In Vietnam, sanitary landfilling is the most common way to treat municipal solid wastes. One of the main environmental problems generated from landfill is leachate, which is containing high ammonia concentration and refractory organics [1]. The conventional nitrogen removal process requires high oxygen supplied for nitrification and external carbon source for denitrification that result in high treatment costs. In recent years, a partial nitritation coupled with anammox process was proven as a advanced technology for nitrogen removal as its low demand for oxygen and no external carbon added ([2];[3];[4]). The process involve two stages: Partial Nitritation oxidizing a part ammonium to nitrite until NH4+-N/NO2-N ratio is about , ideal for .
