Section Sanitary Engineering, Department of Water Management, Faculty of Civil Engineering and Geosciences, Delft University of Technology, Delft, The Netherlands.
J Environ Manage. 2013 Dec 15;131:44-54. doi: 10.1016/j.jenvman.2013.09.016. Epub 2013 Oct 18.
Brackish/marine recirculation aquaculture systems (RAS) produce a relatively small but concentrated waste stream. The produced waste is perceived as a constraint for sustainable development of brackish/marine RAS. Appropriate disposal of sludge or waste from brackish/marine RAS is of great importance for widespread acceptance and implementation. Anaerobic stabilization of RAS sludge is considered as a potential cost-effective methodology to achieve effective sludge reduction and biogas production. Therefore, this review presents an overview of studies conducted on anaerobic digestion of sludge from brackish/marine RAS. Several researchers have shown that specific methane yield (SMY) of anaerobic digestion of sludges from brackish/marine RAS is relatively low, mainly in the range of 0.001-0.184 m(3) CH4 (STP)/kg COD of sludge added. The possible reasons for low SMY are reviewed in this work and can be mainly attributed to applied experimental set-ups, particularly improper inoculum, and high salinity, mainly resulting from high sodium cation levels. This review also evaluates the potentials and limitations for phosphorus recovery from the waste streams. Additionally, corresponding approaches to enhance specific methanogenic activities are proposed, particularly about the need for further thickening sludges from brackish/marine RAS in order to increase SMY from the wastes and downsize the anaerobic digestion units.
咸水/海水循环水产养殖系统 (RAS) 产生的废水量相对较小，但浓度较高。产生的废物被认为是咸水/海水 RAS 可持续发展的制约因素。妥善处理咸水/海水 RAS 的污泥或废物对于广泛接受和实施至关重要。RAS 污泥的厌氧稳定化被认为是一种具有成本效益的潜在方法，可以实现有效的污泥减少和沼气生产。因此，本综述介绍了关于咸水/海水 RAS 污泥厌氧消化研究的概述。一些研究人员表明，咸水/海水 RAS 污泥厌氧消化的特定甲烷产量 (SMY) 相对较低，主要在 0.001-0.184 m(3) CH4 (STP)/kg 添加污泥 COD 的范围内。本工作中回顾了低 SMY 的可能原因，主要归因于应用的实验装置，特别是不合适的接种物和高盐度，主要是由于高钠离子水平。本综述还评估了从废物流中回收磷的潜力和局限性。此外，还提出了相应的方法来提高特定产甲烷活性，特别是需要进一步浓缩咸水/海水 RAS 的污泥，以提高废物的 SMY 并缩小厌氧消化装置的规模。
