Advanced Water Management Centre, The University of Queensland, St Lucia, QLD 4072, Australia.
Waste Manag. 2016 May;51:72-80. doi: 10.1016/j.wasman.2016.02.039. Epub 2016 Mar 7.
Cattle paunch is comprised of partially digested cattle feed, containing mainly grass and grain and is a major waste produced at cattle slaughterhouses contributing 20-30% of organic matter and 40-50% of P waste produced on-site. In this work, Temperature Phased Anaerobic Digestion (TPAD) and struvite crystallization processes were developed at pilot-scale to recover methane energy and nutrients from paunch solid waste. The TPAD plant achieved a maximum sustainable organic loading rate of 1-1.5kgCODm(-3)day(-1) using a feed solids concentration of approximately 3%; this loading rate was limited by plant engineering and not the biology of the process. Organic solids destruction (60%) and methane production (230LCH4kg(-1) VSfed) achieved in the plant were similar to levels predicted from laboratory biochemical methane potential (BMP) testing. Model based analysis identified no significant difference in batch laboratory parameters vs pilot-scale continuous parameters, and no change in speed or extent of degradation. However the TPAD process did result in a degree of process intensification with a high level of solids destruction at an average treatment time of 21days. Results from the pilot plant show that an integrated process enabled resource recovery at 7.8GJ/dry tonne paunch, 1.8kgP/dry tonne paunch and 1.0kgN/dry tonne paunch.
牛胃内容物是由部分消化的牛饲料组成，主要含有草和谷物，是牛屠宰场产生的主要废物之一，占现场产生的有机物的 20-30%和 P 废物的 40-50%。在这项工作中，采用温度阶段性厌氧消化（TPAD）和鸟粪石结晶工艺在中试规模上从胃固体废物中回收甲烷能源和营养物质。TPAD 工厂使用约 3%的固体浓度实现了 1-1.5kgCODm(-3)day(-1)的最大可持续有机负荷率；该负荷率受到工厂工程限制，而不是过程的生物学限制。工厂中实现的有机固体破坏（60%）和甲烷产量（230LCH4kg(-1) VSfed）与实验室生化甲烷潜能（BMP）测试预测的水平相似。基于模型的分析表明，批量实验室参数与中试连续参数之间没有显著差异，降解的速度或程度也没有变化。然而，TPAD 工艺确实导致了一定程度的工艺强化，在平均处理时间为 21 天的情况下实现了高水平的固体破坏。中试工厂的结果表明，一种集成工艺使资源回收达到 7.8GJ/干吨牛胃内容物、1.8kgP/干吨牛胃内容物和 1.0kgN/干吨牛胃内容物。
