Department of Civil and Environmental Engineering, Water Technology Center, Hong Kong Branch of Chinese National Engineering Research Center for Control & Treatment of Heavy Metal Pollution, The Hong Kong University of Science & Technology, Clear Water Bay, Hong Kong.
School of Chemistry & Environment, South China Normal University, Guangzhou, China.
Water Res. 2019 Jun 15;157:74-82. doi: 10.1016/j.watres.2019.03.061. Epub 2019 Mar 29.
The conversion of food waste (FW) into the sewage system is regarded as a promising method of relieving the burden of solid waste management. However, knowledge about its effects on sewer processes is limited, particularly in terms of biofilm formation and sulfide production. In this study, a gravity sewer system was set up to investigate the effects of the addition of FW on biofilm formation, the sulfate-reducing bacteria (SRB) population, and the sulfide production potential. The sewer biofilm characteristics changed with long-term FW addition, and a greater thickness (by 32%), an increased dry density (by 13%), and more extracellular polymeric substance (by 141%) were observed. The thicker and denser biofilm limited oxygen diffusion, enlarged the anaerobic area in the sewer biofilm, promoted an increase in the SRB population, and enhanced the sulfide production potential in the gravity sewer. Substantial differences in the HS profiles in the biofilm samples with and without the addition of FW were observed via microelectrode analysis. A model-based investigation of sewer biofilm formation with and without the addition of FW was conducted with a dynamic sewer biofilm model to gain further insights into sewer biofilm processes. The results suggest that the addition of FW can promote sulfide production and SRB growth in a sewer biofilm, which can be significantly affected by the ratio of FW to sewage. It is worth further investigations of the impacts of FW addition on the potential sulfide production in pressure sewers.
将食物垃圾（FW）转化为污水系统被认为是缓解固体废物管理负担的一种有前途的方法。然而，关于其对污水系统过程的影响的知识有限，特别是在生物膜形成和硫化物产生方面。在本研究中，建立了重力污水系统来研究 FW 的添加对生物膜形成、硫酸盐还原菌（SRB）种群和硫化物产生潜力的影响。污水生物膜特性随 FW 的长期添加而发生变化，观察到生物膜的厚度增加了 32%，干密度增加了 13%，细胞外聚合物增加了 141%。较厚和较密的生物膜限制了氧气扩散，扩大了污水生物膜中的厌氧区，促进了 SRB 种群的增加，并增强了重力污水中的硫化物产生潜力。通过微电极分析观察到添加 FW 和不添加 FW 的生物膜样品中 HS 分布的显著差异。利用动态污水生物膜模型对添加 FW 和不添加 FW 的污水生物膜形成进行了基于模型的研究，以更深入地了解污水生物膜过程。结果表明，FW 的添加可以促进污水生物膜中的硫化物产生和 SRB 生长，这可以受到 FW 与污水比例的显著影响。值得进一步研究 FW 对压力污水中潜在硫化物产生的影响。
