This study investigated compost quality and gaseous emissions during the algal sludge composting. The experiment explored the feasibility of low initial carbon to nitrogen (C/N) ratio composting by using different volume ratios of algal sludge and spent mushroom substrates (1:1, 1:2, 1:3, and 1:4, corresponding to C/N ratios of 9.5, 12.3, 14.6, 16.0, respectively). The results showed that increasing the proportion of algal sludge in the initial material led to a longer maturation time and higher nitrogen losses but also enhanced the mineralization of organic nitrogen (converted to NH4+ and NO3-) and reduced carbon losses. The addition of carbon-rich bulking agents within a certain range improved the diversity and interactions of bacterial communities during algal sludge composting. In conclusion, considering the nitrogen and carbon lost, retained, and made available across the four treatments, treatment 3 (C/N = 14.6) appears to be the optimal choice for low C/N composting.

中文翻译：

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藻泥好氧堆肥过程中低碳氮比的原料优化：质量和气体排放


本研究调查了藻类污泥堆肥过程中的堆肥质量和气体排放。该实验探讨了使用不同体积比的藻类污泥和废蘑菇基质（1：1、1：2、1：3 和 1：4，分别对应于 9.5、12.3、14.6、16.0）的 C/N 比堆肥的低初始碳氮 （C/N） 比堆肥的可行性。结果表明，增加藻类污泥在初始材料中的比例会导致更长的成熟时间和更高的氮损失，但也增强了有机氮的矿化（转化为 NH4+ 和 NO3-）并减少了碳损失。在一定范围内添加富碳膨胀剂改善了藻泥堆肥过程中细菌群落的多样性和相互作用。总之，考虑到四种处理中损失、保留和可用的氮和碳，处理 3 （C/N = 14.6） 似乎是低 C/N 堆肥的最佳选择。