Informatics Publishing Limited

Na Qi ¹, Xiangyang Sun ¹, Xinhui Qin ², Zhou Yu ³

Affiliations
1 School of Forestry, Beijing Forestry University, Beijing-100083, CN
2 Jiuquan Vocational and Technical College, Jiuquan-735000, Gansu Province, CN
3 Beijing Sen Miao Tian Cheng Environmental Protection Technology Co. Ltd., Beijing-100081, CN

Abstract

Peat and mushroom residues were selected for adsorption isotherm and adsorption kinetics experiments and to comparatively discuss the effects of removing ammonia-nitrogen and the total phosphorus in wastewater. The results showed that the peat and mushroom residues for removing ammonianitrogen and the total phosphorus followed the Freundlich and Langmuir equations of the adsorption isotherm. By using a fitting equation, we obtained the static adsorption quantities of ammonia-nitrogen, which were 2.3679 mg/g and 2.1643 mg/g, and the static adsorption quantities of total phosphorus were 1.4363 mg/g and 1.3758 mg/g. A first-order kinetics equation was used to fit the reaction process of the two-substrate adsorption of ammonia-nitrogen and the total phosphorus. The correlation coefficients were all desirably above 0.990. Furthermore, the adsorption rates of ammonia-nitrogen were 0.0088 g/(mg·min) and 0.0084 g/(mg·min), and the adsorption rates of the total phosphorus were 0.001 g/(mg·min) and 0.0006 g/(mg·min). In a simulation of the soil percolation system, a volume ratio of 10% peat and 10% mushroom residues with different sizes of 0.5, 2 and 4 mm were mixed with the soil in different treatments (T1-T6), and the control group was the soil (CK). The concentration of ammonia-nitrogen in the wastewater was 54.45-78.96 mg/L, and the hydraulic loading was 0.08 m³/ (m²·d). The performance of seven types of experimental devices for removing ammonia-nitrogen in the wastewater was T2 > T3 > T1 > T6 > T5 > T4 > CK. The average concentration of ammonia-nitrogen in the effluent water was 65.58 mg/L, and the removal rate of ammonia-nitrogen and the total phosphorus reached 88.04-95.32% and 89.23-97.08%, respectively, which satisfied the additional minimum UWTD treatment performance for a discharge to a sensitive area.

Keywords

Peat and Mushroom, Residues, Ammonia-Nitrogen, Total Phosphorus, Wastewater.

Full Text