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Removal of ammoniacal nitrogen and oxidised nitrogen in landfill leachate using vegetated constructed wetland with continuous flow through different filter media

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4 Author(s)
Noor, A.M. ; Sch. of Chem. Sci., Univ. Sains Malaysia, Minden, Malaysia ; Lim Chin Shiam ; Soetardjo, S. ; Khalil, H.P.S.A.

Performance of the vegetated horizontal subsurface-flow constructed wetland was evaluated for the removal of ammoniacal nitrogen (AN), total oxidized nitrogen (TNOx-N) and nitrite nitrogen (NO2-N) from landfill leachate. Four reactors were used, RI (granite without vegetation), RII and RIII which consists of granite and gravel with different sizes respectively and RIV contained sand and 67.5 L of charcoal. RII, RIII and RIV were planted with cattails. The leachate obtained from the site of Pulau Burung Sanitary Landfill, Penang was introduced into RI at flow rate of 18 mL/min which was continuous to flow through another three reactors. The leachate was analyzed for AN, TNOx-N and NO2-N before and after the treatment in each reactor by standard methods. The overall average removal efficiency of AN and NO2-N were 86.7 % and 19.5 % respectively but negative effect to TNOx-N which was -16.3 %. The negative result shows the increased in the concentration of TNOx-N. Reactor IV performed the best for removal of AN and NO2-N which is 60.9 % and 66.2 % respectively, whereas, RII had highest performance for removal of TNOx-N of 24.1%.

Published in:

Chemistry and Chemical Engineering (ICCCE), 2010 International Conference on

Date of Conference:

1-3 Aug. 2010