College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, PR China; Key Laboratory of Hunan Province for Water Environment and Agriculture Product Safety, Changsha 410083, PR China.
College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, PR China; Key Laboratory of Hunan Province for Water Environment and Agriculture Product Safety, Changsha 410083, PR China.
Sci Total Environ. 2024 Nov 20;952:175854. doi: 10.1016/j.scitotenv.2024.175854. Epub 2024 Aug 30.
Large amounts of waste activated sludge are generated daily worldwide, posing significant environmental challenges. Anaerobic fermentation is a promising method for sludge disposal, but it has two technical bottlenecks: the availability of short-chain fatty acids (SCFAs)-producing substrates and SCFAs consumption by methanogenesis. This study proposes a pretreatment strategy combining sodium percarbonate (SPC) and magnetite (FeO) to address these issues. Under optimized conditions (20 mg FeO/g TSS and 15 mg SPC/g TSS), SCFAs production increased to 3244.10 ± 216.31 mg COD/L, about 3.06 times the control (1057.29 ± 35.06 mg COD/L) and surpassing reported treatments. The combined pretreatment enhanced the disruption of extracellular polymeric substances, increased the release of biodegradable matters, improved acidogenesis enzyme activities, and inhibited methanogenesis. Additionally, it increased NH-N release in favor of the recovery of phosphorus from sludge residual. This study demonstrates an efficient pretreatment for high SCFAs production and resource recovery from WAS.
每天全球都会产生大量的废活性污泥，这给环境带来了巨大的挑战。厌氧发酵是一种很有前途的污泥处理方法，但它存在两个技术瓶颈：即短链脂肪酸（SCFAs）产生基质的可用性和产甲烷菌对 SCFAs 的消耗。本研究提出了一种联合预处理策略，即使用过碳酸钠（SPC）和磁铁矿（FeO）来解决这些问题。在优化条件下（20 mg FeO/g TSS 和 15 mg SPC/g TSS），SCFAs 的产量增加到 3244.10 ± 216.31 mg COD/L，约为对照（1057.29 ± 35.06 mg COD/L）的 3.06 倍，超过了已报道的处理方法。联合预处理增强了胞外聚合物的破坏，增加了可生物降解物质的释放，提高了产酸酶的活性，同时抑制了产甲烷菌的活性。此外，它还促进了 NH-N 的释放，有利于从污泥剩余物中回收磷。本研究展示了一种高效的预处理方法，可从废活性污泥中获得高产量的 SCFAs 和资源回收。
