ORIGINAL RESEARCH
Removal of Ammonia Nitrogen from Wastewater
Using Modified Activated Sludge
Chen Yunnen, Xiong Changshi, Nie Jinxia
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
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
KEYWORDS
ammonium-nitrogen (N-NH4) removalActivated sludge modified by ferric hydroxide (FHMAS)cation exchangeadsorptionactivated sludge modified by ferric hydroxide(FHMAS)
TOPICS
ABSTRACT
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.
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