Study on the adsorption of nutrients in the wastewater of catfish ponds by the adsorbent system prepared from peat

Fabrication of adsorbent materials has been done by mixing peat and coal slag, the ratio of 70:30 by weight. The obtained material has a specific surface area S of 10.45 m2/g, rough surface morphology with many functional groups, with high adsorption capacity. The time to reach adsorption equilibrium is 120 minutes, COD adsorption capacity of 15.54 mg/g, N-NH4 adsorption capacity of 10.72 mg/g. The kinetic law of N-NH4 adsorption obeys the apparent second order type 2 equation. The N-NH4 adsorption isotherm obeys both Langmuir and Freundlich equations. The materials are used to adsorb substances in catfish pond wastewater with the criteria of BOD5, COD, N-NO3, N-NH4, total phosphorus, and treatment efficiency from 24.95 to 88.81%.