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Removal of ammonia nitrogen from wastewater using modified activated sludge

100%

Yunnen C., Changshi X., Jinxia N.

Polish Journal of Environmental Studies

2016

tom 25

nr 1

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.

Continuous fixed-bed column study and adsorption modeling:removal of arsenate and arsenite in aqueous solution by organic modified spent grains

76%

Yunnen C., Ye W., Chen L., Lin G., Jinxia N., Rushan R.

Polish Journal of Environmental Studies

2017

tom 26

nr 4

The adsorption of arsenate (As(V)) and arsenite (As(III)) was conducted in a continuous fixed-bed column by using organic modified spent grains (OSGs). The column performances were evaluated by varying the influent flow rate (0.91, 1.36, and 2.72 ml/min) and arsenic ions initial concentration (1.0, 2.0, and 6.0 mg/l for As(V); 0.5, 1.0, and 3.0 mg/l for As(III)) in order to obtain experimental breakthrough curves. The maximum adsorption capacity was at 6.0 mg/l for As(V) and 3.0 mg/l for As(III) influent concentration and 1.36 ml/min flow rate. The Thomas model, Adams-Bohart model, and Yoon-Nelson kinetic models were used to analyze column performance. The value of rate constant for Thomas and Adams-Bohart models decreased with increase of influent concentration, but increased with increasing flow rate. The rate constant for the Yoon-Nelson model decreased with increases in both initial influent arsenic ions concentration and flow rate.

Ograniczanie wyników

2 Polish Journal of Environmental Studies

2 Jinxia N.

2 Yunnen C.

1 Changshi X.

1 Chen L.

1 Lin G.

1 Rushan R.

1 Ye W.

1 2017

1 2016

Wyniki wyszukiwania

Removal of ammonia nitrogen from wastewater using modified activated sludge

Continuous fixed-bed column study and adsorption modeling:removal of arsenate and arsenite in aqueous solution by organic modified spent grains