Spent mushroom substrates as biofilter to reduce antibiotics (tetracyclines and sulfonamides) from wastewaters to be used in hydroponic cultures
The presence of antibiotics in the environment is increasingly pronounced, this generates a new problem as they are emerging pollutants that over time can cause super resistant bacteria. One of the routes of incorporation into the body that is convenient to explore is through vegetable crops, especially those produced with irrigation strategies based on regenerated wastewater from wastewater treatment plants (WWTP), loaded with antibiotics, or substrates and amendments with organic wastes from animal origin. In this work, the use of a residual material for carrying out a biological alternative to degrade the antibiotics present in these waters has been evaluated in order to use them for the irrigation of lettuce (Lactuca sativa L.) crops. Different biofilters have been developed based on spent substrate from oyster mushroom (Pleurotus ostreatus) industrially grown (SMS), in order to take advantage of their possible antibiotic adsorption and degradation properties. Water from a WWTP located in Madrid with the presence of antibiotics (sulfonamides-SAs and tetracyclines-TCs) was introduced in the spent mushroom biofilters where the antibiotic dissipation was evaluated. Considerable decreases in the concentrations of antibiotics in the treated water were obtained thanks to adsorption phenomena in the SMS and to the enzymatic degradation caused by residual fungal enzymes. On the other hand, lettuce grown in perlite as growing media, and irrigated with the wastewater treated with the biofilter contained significantly lower antibiotic concentrations.
Camacho-Arévalo, R., Eymar, E., Gómez, A., Mayans, B., Antón-Herrero, R. and García-Delgado, C. (2021). Spent mushroom substrates as biofilter to reduce antibiotics (tetracyclines and sulfonamides) from wastewaters to be used in hydroponic cultures. Acta Hortic. 1321, 63-70
hydroponic cultures, mycoremediation, Pleurotus