Aerobic composting effect of crop straw with biogas residue

Abstract

This study aims to improve the aerobic composting efficiency and quality of biogas residue. The residue of biogas production from pig manure was mixed with coconut leaves, sugarcane leaves, and sawdust, respectively, for the aerobic composting experiments. The pile temperature, pH, organic matter content, seed germination index, total nitrogen, total phosphorus, and total potassium were measured to evaluate the composting performance of different treatments. The results showed that the aerobic composting treatment of biogas residue mixed with sugarcane leaves had a seed germination index of 107.71%, the highest maturity, and the highest total phosphorus and total potassium. The aerobic composting treatment of biogas residue mixed with coconut leaves maintained high temperatures above 55 °C for the longest time (23 days) and demonstrated the most thorough harmless treatment, with the total nitrogen increase being the highest (75.63%), which indicated the strongest nitrogen retention capacity. Overall, the supplementation of coconut leaves and sugarcane leaves can improve the maturity and nutrient content, thus improving the aerobic composting quality of biogas residue. The findings provide a scientific basis for the harmless treatment and reuse of manure biogas residue and crop straw.