Removal of Ammonia Nitrogen from Wastewater Using Modified Activated Sludge
Chen Yunnen, Xiong Changshi, Nie Jinxia
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School of Resource and Environmental Engineering, Jiangxi University of Science and Technology,
Jiangxi Key Laboratory of Mining & Metallurgy Environmental Pollution Control
Hongqi Ave. 86, Ganzhou Jiangxi 341000, P.R. China
Submission date: 2015-03-09
Final revision date: 2015-12-01
Acceptance date: 2015-12-02
Publication date: 2016-01-25
Pol. J. Environ. Stud. 2016;25(1):419–425
The removal of medium-low N-NH4 on activated sludge modified by ferric hydroxide suspension (FHMAS) in batch studies was conducted as a function of pH, concentration of modifier, contact time, and initial concentration. The kinetics study showed that the sorption behavior fit well the pseudo second-order equation. An adsorption isotherms study indicated that FHMAS had a higher adsorption capacity for N-NH4 than other adsorbents. The mechanism of removal of N-NH4 by FHMAS was coexistence of adsorption and cation exchange. Initial N-NH4 concentration being 116 mg/l in metallurgical wastewater was reduced to 11 mg/l after adsorption treatment.