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Comparison Between Biological Treatment and Chemical Precipitation for

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Author(s): Long Tengrui | Anas F. Al-Harbawi | He Qiang | Zhai Jun

Journal: American Journal of Environmental Sciences
ISSN 1553-345X

Volume: 3;
Issue: 4;
Start page: 183;
Date: 2007;
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Keywords: Biological treatment | SBBR | MAP | struvite

ABSTRACT
The study reports the results of a laboratory scale investigation aimed at evaluating theeffectiveness of mature municipal landfill leachate treatment by a biological stage (used SBBR as abiological treatment) and Chemical precipitation (Used MAP precipitation (magnesium ammoniumphosphate)) to study the nitrogen removal capabilities for treatment of sanitary landfill leachatecontaining high ammonia concentration, and the comparison between them. The monitored sampletaken from the Chang Sheng bridge landfill site in Chongqing city-China, has its concentrations ofCOD, BOD5, and NH3-N about 1650, 75 and 1100 mg/l respectively. The results from SBBR showedthat after two months long period of domestication and one month period of stability, the ammonianitrogen removal efficiency reached to 99% in the SBBR reactor, at nitrogen loading rate 0.51 kgTN/m3 per day and HRT was 9 hours, met to Chinese standards for discharge. The results of the MAPprecipitation was technically effective to remove the high NH3-N strength of over 1100 mg/l from theraw leachate at molar ratio of Mg2+: NH4+: PO4-3 of 1:1:1, they demonstrated a very satisfactoryremoval of ammonia; an initial NH3+-N concentration of 1100 mg/l contained in the raw leachate wasquickly reduced to 28 mg/l within 15 min, while the pH producing a maximum removal of ammoniawas 9.0. The percent removal of ammonia after treatment by MAP was 97.5%.
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