Alatriste-Mondragón Felipe, Samar Parviz, Cox Huub H J, Ahring Birgitte K, Iranpour Reza
Department of Environmental Engineering and Natural Resource Management, Institute of Scientific and Technologica Research, Potosi, Mexico.
Water Environ Res. 2006 Jun;78(6):607-36. doi: 10.2175/106143006x111673.
Codigestion of organic wastes is a technology that is increasingly being applied for simultaneous treatment of several solid and liquid organic wastes. The main advantages of this technology are improved methane yield because of the supply of additional nutrients from the codigestates and more efficient use of equipment and cost-sharing by processing multiple waste streams in a single facility. Many municipal wastewater treatment plants (WWTPs) in industrialized countries currently process wastewater sludge in large digesters. Codigestion of organic wastes with municipal wastewater sludge can increase digester gas production and provide savings in the overall energy costs of plant operations. Methane recovery also helps to reduce the emission of greenhouse gases to the atmosphere. The goal of this literature survey was to summarize the research conducted in the last four years on anaerobic codigestion to identify applications of codigestion at WWTPs. Because the solids content in municipal wastewater sludge is low, this survey only focuses on codigestion processes operated at relative low solids content (slurry mode). Semi-solid or solid codigestion processes were not included. Municipal wastewater sludge, the organic fraction of municipal solid waste, and cattle manure (CAM) are the main wastes most often used in codigestion processes. Wastes that are codigested with these main wastes are wood wastes, industrial organic wastes, and farm wastes. These are referred to in this survey as codigestates. The literature provides many laboratory studies (batch assays and bench-scale digesters) that assess the digestibility of codigestates and evaluate the performance and monitoring of codigestion, inhibition of digestion by codigestates, the design of the process (e.g., single-stage or two-stage processes), and the operation temperature (e.g., mesophilic or thermophilic). Only a few reports on pilot- and full-scale studies were found. These evaluate general process performance and pretreatment of codigestates, energy production, and treatment costs.
有机废物的共消化是一种越来越多地用于同时处理多种固体和液体有机废物的技术。该技术的主要优点是，由于共消化产物提供了额外的养分，甲烷产量得以提高，并且设备使用效率更高，通过在单个设施中处理多种废物流实现了成本分摊。工业化国家的许多城市污水处理厂目前在大型消化池中处理废水污泥。有机废物与城市污水污泥的共消化可以增加消化池气体产量，并节省工厂运营的总体能源成本。甲烷回收还有助于减少向大气中排放温室气体。本次文献综述的目的是总结过去四年中关于厌氧共消化的研究，以确定共消化在污水处理厂的应用。由于城市污水污泥中的固体含量较低，本次综述仅关注在相对低固体含量（浆液模式）下运行的共消化过程。不包括半固体或固体共消化过程。城市污水污泥、城市固体废物的有机部分和牛粪是共消化过程中最常用的主要废物。与这些主要废物一起进行共消化的废物有木材废物、工业有机废物和农场废物。在本次综述中，这些被称为共消化产物。文献中有许多实验室研究（批次试验和实验室规模的消化池），评估共消化产物的消化率，评估共消化的性能和监测、共消化产物对消化的抑制作用、工艺设计（例如单级或两级工艺）以及运行温度（例如中温或高温）。仅发现了少数关于中试和全规模研究的报告。这些报告评估了一般工艺性能、共消化产物的预处理、能源生产和处理成本。
