Chemical Engineering Department, Institute for Chemical and Environmental Technology ITQUIMA, University of Castilla La Mancha, Avenida Camilo José Cela S/N, 13071 Ciudad Real, Spain.
Bioresour Technol. 2011 Jun;102(11):6562-8. doi: 10.1016/j.biortech.2011.03.080. Epub 2011 Mar 29.
A static electrolytic respirometer was adapted to work under dynamic conditions using an internal airflow recirculation system that passed air through sludge/straw solid mixtures. Airflow reduced oxygen transfer limitations and increased the maximum respiration rate and k(L)a values, indicating that the observed value may have been close to the actual biodegradation rate. Airflow caused sludge drying, so the sample moisture was controlled by air humidification. To apply the optimised respirometric technique, a pilotscale composting process was developed. Some commonly used respiration indices (RI(24), AT(4)) were used to measure the final compost stability. RI(24) indices without airflow were underestimated during the thermophilic composting stage. Once the easily biodegradable carbon was consumed, the static and dynamic RI(24) indices were nearly identical. Because of the dynamic procedure, the respiration rate was likely controlled by the biochemical reaction and not by the mass transfer. The respiration indices indicated that the final compost was unstable.
静态电解呼吸计通过内部气流再循环系统适应动态条件下工作，该系统使空气通过污泥/秸秆固体混合物。空气流量降低了氧气传递限制，增加了最大呼吸速率和 k(L)a 值，表明观察值可能接近实际生物降解速率。空气流量导致污泥干燥，因此通过空气加湿来控制样品水分。为了应用优化的呼吸计量技术，开发了一个中试规模的堆肥工艺。一些常用的呼吸指数（RI(24)、AT(4)）用于测量最终堆肥的稳定性。在高温堆肥阶段，没有气流的 RI(24)指数被低估。一旦易生物降解的碳被消耗，静态和动态 RI(24)指数几乎相同。由于动态过程，呼吸速率可能受到生化反应的控制，而不是传质的控制。呼吸指数表明最终堆肥不稳定。
