Producing organic fertilizer by aerobic composting is an effective way to solve the livestock manure pollution problem and to achieve economic utilization of the valuable resource. To control the composting process effectively and ensure the quality of such organic fertilizers, it is necessary to quantify the key parameters and provide timely feedback of their changes during the composting process. In the industrial field, the traditional laboratory analysis is being transferred into process analysis. This study explored the application of real-time and field monitoring of the key parameters in the industrial trough composting process using handheld near infrared (NIR) spectroscopy and evaluated its ability to accurately predict these changes. The results showed that the handheld NIR could accurately detect moisture content (MC), total nitrogen (TN), total carbon (TC), the carbon/nitrogen (C/N) ratio, organic matter (OM) and electrical conductivity (EC) during the trough composting process, with excellent predictions for MC, good predictions for TN and OM, approximate predictions for TC, C/N ratio and EC. Changes in NIR-predicted values and measured values were consistent as the composting process progressed. The handheld NIR sensor shows good potential for real-time and field monitoring of the composting process and organic fertilizer quality assurance.

中文翻译：

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手持式近红外光谱仪对工业槽式堆肥过程关键参数的实时现场监测

好氧堆肥生产有机肥是解决畜禽粪便污染问题，实现宝贵资源经济利用的有效途径。为有效控制堆肥过程，保证有机肥质量，需要对堆肥过程中的关键参数进行量化并及时反馈其变化。在工业领域，传统的实验室分析正在向过程分析转变。本研究探索了使用手持式近红外 (NIR) 光谱对工业槽式堆肥过程中关键参数进行实时和现场监测的应用，并评估其准确预测这些变化的能力。结果表明，手持式近红外光谱仪可以准确检测水分含量（MC），槽式堆肥过程中的总氮 (TN)、总碳 (TC)、碳/氮 (C/N) 比、有机质 (OM) 和电导率 (EC)，对 MC 有很好的预测，对 TN 有很好的预测和 OM，对 TC、C/N 比和 EC 的近似预测。随着堆肥过程的进行，NIR 预测值和测量值的变化是一致的。手持式 NIR 传感器在堆肥过程的实时和现场监测和有机肥质量保证方面显示出良好的潜力。随着堆肥过程的进行，NIR 预测值和测量值的变化是一致的。手持式 NIR 传感器在堆肥过程的实时和现场监测和有机肥质量保证方面显示出良好的潜力。随着堆肥过程的进行，NIR 预测值和测量值的变化是一致的。手持式 NIR 传感器在堆肥过程的实时和现场监测和有机肥质量保证方面显示出良好的潜力。