Raw data for “Purification characteristics and regeneration performance of pig-manure-derived biochar for digested slurry”
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Raw data for “Purification characteristics and regeneration performance of pig-manure-derived biochar for digested slurry”
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Pretreated pig-manure powder was placed in a tube furnace and pyrolyzed under high-purity nitrogen. With reference to previous studies on pig-manure biochar preparation , the heating rate was set to 10 °C min⁻¹ and the target temperatures were 400, 500, 600, 700, and 800 °C. Each target temperature was maintained for 2 h, and the nitrogen flow rate was 50 mL min⁻¹. The products were designated BC400, BC500, BC600, BC700, and BC800, respectively. Each biochar was washed with deionized water until the pH of the washings stabilized and was then dried for subsequent use. For each treatment, 6 g of biochar was added to 200 mL of digested slurry. The suspension was stirred at constant temperature for 30 min and then allowed to stand for 2 h. COD, NH₄⁺-N, TN, TP, pH, and electrical conductivity (EC) were measured in the supernatant. Three replicates were prepared for each treatment.BC600 was added to 100 mL aliquots of digested slurry at dosages of 3.0, 4.0, 5.0, 6.0, 7.0, and 8.0 g/100 mL. The suspensions were stirred at constant temperature for 30 min and then allowed to stand for 2 h. The supernatants were analyzed for COD, NH₄⁺-N, TN, TP, pH, and EC. Each treatment was performed in triplicate.Pollutant-loaded biochar was prepared using an adsorption-column method, collected, and dried. The spent biochar was placed in a tube furnace under high-purity nitrogen and heated at 10 °C/min to 400, 500, 600, 700, or 800 °C. Each target temperature was maintained for 2 h. After cooling, the regenerated products were designated RBC400, RBC500, RBC600, RBC700, and RBC800, respectively. Each regenerated biochar was added to 100 mL of digested slurry at 6.0 g/100 mL. The suspensions were stirred at constant temperature for 30 min and then allowed to stand for 2 h. COD, NH₄⁺-N, TN, TP, pH, and EC were measured in the supernatant. Three replicates were prepared for each treatment.