Study on Precipitation Treatment of Ammonia Nitrogen in the Wastewater from Ethanol Production Using Cassava

Jing LIU, Juan TANG, Hua YANG, Yan-sa ZHANG, Bo-han LI, De-jun BIAN


Ammonia nitrogen in the wastewater from ethanol production using cassava was removed by precipitation method in the paper. It was studied that the varieties and dosages of precipitants, pH value and reaction time have an effect on removal of ammonia nitrogen. The experimental results indicated that the removal rate of ammonia nitrogen is able to reach 93.7% under the condition of a pH of 9, MgCI2·6H2O and Na2HPO4·12H2O as precipitants and 30 minutes of reaction time. The mole rate of Mg2+ / NH4+ / PO43- is 1.4 / 1 / 1.2. Meanwhile the obtained precipitate NH4MgPO4·6H2O, also called struvite, could be made use of compound fertilizer.


Precipitation, Ammonia nitrogen, Magnesium ammonium phosphate (MAP), Ethanol production using cassava



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