Título del libro: Current Developments In Biotechnology And Bioengineering: Advances In Biological Wastewater Treatment Systems
Título del capítulo: Constructed wetland for pollutants removal from agricultural runoff
MARIA GUADALUPE SALINAS JUAREZ; AURORA MARGARITA PAT ESPADAS;
Autores externos:
Idioma:
Año de publicación:
2022
Palabras clave:
assisted constructed wetland; Corn silk application; cropland wastewater; phosphorus dynamic; phosphorus runoff
Resumen:
This chapter focused on the use of constructed wetlands (CWETs) for the removal of organic matter and phosphorus contained in cropland wastewater (CropWW). CropWW was obtained from an agricultural drain located in the most representative irrigation module of an agricultural hydrological basin. The treatment system consisted of a pretreatment for phosphorus removal followed by an aerobic CWET. The pretreatment unit was a rapid in fast filtration system (FFS) packed with limestone and Stigma Maydis (corn silk). Two FFS systems were tested. FFS_1 contained two concentric layers, the first one was packed with limestone (208.8cm3) followed by a corn silk layer (787.3cm3), and FFS_2 contained 208.78cm3 of corn silk followed by 787.34cm3 of limestone. Results shown that in both FSS, the removal of chemical oxygen demand (COD) and total phosphorus increased with the operation time and without significant differences (P>0.78), which was related to film development on the pores in the middle package. From day 18, FSS_1 was significantly more efficient than FFS_2, reaching up to 66% and 56% removal efficiency for COD and it total phosphorus (TP) versus 55% and 48% for COD and TP, respectively. Moreover, the fraction of Org-P removed in FFS_1, was twofold higher as compared to FFS_2, which was related to adsorption and chemisorption?s synergistic effect of biofilms attached to the lignocellulosic material for the removal of organophosphorus pesticides. In the second stage, after 14 operation days, the efficiency of CWET_2 was about 50% higher than CWET_1. This difference was clearly correlated with Org-P removal in pretreatment. The results obtained demonstrated that the treatment system proposed in this study was able to achieve similar organic matter and TP removal efficiencies to those reported for systems with high technification and chemical additive requirements. Moreover, the efficient pretreatment allowed CWETs to be stable with a hydraulic residence time (HRT) of 1 day. It is recommended to carry out technical and economic feasibility study to evaluate large-scale treatment systems installation in agricultural areas. © 2022 Elsevier Inc. All rights reserved.
Entidades citadas de la UNAM:
ISBN:
9780323998741
Editorial:
Elsevier Nombre de la publicación:
Constructed wetland for pollutants removal from agricultural runoff
Página inicial:
339
Página final:
356
