Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai, 264003, China.
School of Environmental Science and Engineering, Shandong University, Qingdao, 266237, China.
Chemosphere. 2023 Dec;345:140505. doi: 10.1016/j.chemosphere.2023.140505. Epub 2023 Oct 20.
With the rapid development of aquaculture, the production of oyster shells has surged, posing a potential threat to the environment. While oyster shell powder is widely recognized for its inherent alkalinity and rich calcium carbonate content, making it a superior soil conditioner, its role in organic solid waste composting remains underexplored. To investigate the effects of varying concentrations of oyster shell powder on compost maturation and calcium activation, this study employed thermophilic co-composting with acidic sugar residue and bean pulp, incorporating 0% (control), 10% (T1), 20% (T2), 30% (T3), and 40% (T4) oyster shell powder. Findings revealed that appropriate proportions of oyster shell powder significantly enhance temperature stability during composting and elevate maturation levels, notably reducing ammonia emissions between 62.5% and 76.7%. Intriguingly, the calcium in the oyster shell powder was significantly activated during composting, with the 40% addition group achieving the highest calcium activation rate of 48.5%. In summation, the inclusion of oyster shell powder not only optimizes the composting process but also efficiently activates the calcium, resulting in an alkaline organic-inorganic composite soil conditioner with high exchangeable calcium content. This research holds significant implications for promoting the high-value utilization of oyster shells.
随着水产养殖业的快速发展，牡蛎壳的产量猛增，对环境构成了潜在威胁。虽然牡蛎壳粉以其固有的碱性和丰富的碳酸钙含量而被广泛认可，是一种优良的土壤改良剂，但它在有机固体废弃物堆肥中的作用仍未得到充分探索。为了研究牡蛎壳粉浓度对堆肥成熟和钙活化的影响，本研究采用高温共混堆肥法，用酸性糖渣和豆粕作为原料，分别添加 0%（对照）、10%（T1）、20%（T2）、30%（T3）和 40%（T4）的牡蛎壳粉。结果表明，适量的牡蛎壳粉可显著提高堆肥过程中的温度稳定性，促进堆肥成熟，氨排放减少 62.5%至 76.7%。有趣的是，堆肥过程中牡蛎壳粉中的钙被显著活化，40%添加组的钙活化率最高，达到 48.5%。总之，添加牡蛎壳粉不仅优化了堆肥过程，还能有效地活化钙，形成一种具有高交换性钙含量的碱性有机-无机复合土壤改良剂。本研究对促进牡蛎壳的高值化利用具有重要意义。
