Composting of two different types of sludge from the recycled paper manufacturing industry was carried out at laboratory scale. Physico-chemical sludge (PCS) from the de-inking process and biological sludge (BS) from the wastewater treatment plant were composted and co-composted with and without addition of a bulking material. Despite its poor initial characteristics (relatively high C/N ratio, low organic content and moisture), PCS showed excellent behaviour in the composting process, reaching and maintaining thermophilic temperatures for more than 7 days at laboratory scale, and therefore complete hygienization. Pilot scale composting of PCS was also studied, and a respiratory quotient of 1.19 was obtained, indicating a full aerobic biological process. Respiration tests showed a complete stabilization of the material, with final values of the static respiration index in the range of 1.1 mg O₂ g TOM⁻¹ h⁻¹. Composting is proposed as a suitable technology for the effective recycling of this type of sludge from the recycled paper manufacturing industry.
展开▼
机译：在实验室规模下对来自再生纸制造行业的两种不同类型的污泥进行堆肥。将脱墨过程中的物理化学污泥（PCS）和废水处理厂中的生物污泥（BS）进行堆肥，并在不添加填充材料的情况下共同混合。尽管PCS的初始特性较差（相对较高的C / N比，较低的有机物含量和水分），但PCS在堆肥过程中表现出出色的性能，在实验室规模达到并保持嗜热温度超过7天，因此完全卫生。还对PCS的中试堆肥进行了研究，得到的呼吸商为1.19，表明整个有氧生物过程。呼吸测试表明材料完全稳定，静态呼吸指数的最终值在1.1 mg O 2 g TOM -1 h -1范围内。提出堆肥作为有效回收来自再生纸制造行业的这类污泥的合适技术。
展开▼
