Banca de DEFESA: YURI MARINHO FERREIRA

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : YURI MARINHO FERREIRA
DATE: 30/07/2025
TIME: 14:00
LOCAL: Ambiente Virtual
TITLE:

NUTRIENT RECOVERY FROM WASTEWATER USING BIOCHAR PRODUCED FROM SPENT MUSHROOM COMPOST

KEY WORDS:

Biochar, adsorption, waste valorization, shiitake, shimeji.

PAGES: 65
BIG AREA: Ciências Agrárias
AREA: Engenharia Agrícola
SUMMARY:

Mushroom production uses a substrate composed of straw, bagasse, and sawdust, which, after depletion, becomes an agro-industrial residue commonly referred to as spent mushroom compost (SMC). It is estimated that 5 kg of SMC are generated for every 1 kg of mushrooms produced. A promising waste valorization technique is its conversion into biochar through pyrolysis. Biochar can be used for the removal of nutrients (nitrogen and phosphorus) from wastewater, which, when properly recovered, can be reused in agriculture. This study aimed to evaluate the nutrient removal capacity of SMC-derived biochar. Two types of biochar were produced: one from shiitake SMC (BCST) and another from shimeji SMC (BCSM), varying the pyrolysis temperature (400°C, 500°C, 600°C) and biochar activation (chemical treatment with MgCl₂; without chemical treatment). Preliminary tests were conducted for the removal of ammoniacal nitrogen, nitrate, and total phosphorus after 24 hours of contact, using a ratio of 30 g of biochar per liter of solution. Subsequently, experiments were carried out varying the pyrolysis temperature (400°C, 500°C, 600°C) and biochar dosage (5 g/L, 7.5 g/L, 10 g/L) for both BCST and BCSM. In preliminary tests, non-activated biochar showed negligible performance, whereas chemically treated biochar achieved removal efficiencies of 11.1% for ammoniacal nitrogen, 3.3% for nitrate, and 98.1% for total phosphorus after 24 hours at 30 g/L. Chemically treated shiitake biochar (BCST) showed maximum adsorptive capacity (qe=21.26 mg/g) when produced at 500°C and tested at the lowest initial phosphorus concentration, with efficiencies above 93% under all experimental conditions. Shimeji biochar (BCSM) with chemical activation removed more than 99.9% of total phosphorus across all tested conditions, regardless of pyrolysis temperature or initial phosphorus concentration, highlighting its high potential as a phosphorus adsorbent for nutrient recovery and reuse, particularly for agricultural purposes.

COMMITTEE MEMBERS:
Presidente - 1759225 - ALEXANDRE LIOI NASCENTES
Interno - 2353141 - LEONARDO DUARTE BATISTA DA SILVA
Externo à Instituição - DIEGO MACEDO VENEU - UERJ