State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, PR China.
State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, PR China; Shanghai Institute of Pollution Control and Ecological Security, Shanghai 200092, PR China.
Bioresour Technol. 2021 Feb;322:124553. doi: 10.1016/j.biortech.2020.124553. Epub 2020 Dec 17.
A novel composite CaO bead was prepared to improve total short-chain fatty acids (TSCFAs) production and phosphorus (P) recovery from iron-rich waste activated sludge (WAS) during ambient anaerobic fermentation. Results showed that CaO mass percentage of 5% and CaCl:nylon66 = 1:1 (mass ratio) were the optimal prescription for the preparation of CaO beads with porous structure, loose morphology, and sustained-release of CaO. The highest TSCFAs production (356 mg/g VSS) was observed and about 9% of P in sludge could be recovered on beads. The decrease of Fe-phosphate and Fe-oxides in the sludge were due to different mechanisms. Microbial community analyses showed that CaO beads effectively enriched dissimilatory iron-reducing bacteria (DIRB) and promoted iron-reduction related genes. After fermentation, the P-rich beads are easy to separate from sludge for further P recovery, and the supernatant carrying abundant acetate and Fe can be returned to the wastewater treatment line to improve nutrient removal.
一种新型复合 CaO 珠粒被制备出来，以改善富铁剩余污泥（WAS）在环境厌氧发酵过程中的总短链脂肪酸（TSCFAs）生产和磷（P）回收。结果表明，当 CaO 质量百分比为 5%且 CaCl:nylon66=1:1（质量比）时，CaO 珠粒具有多孔结构、疏松形态和 CaO 的持续释放。观察到最高的 TSCFAs 产量（356mg/g VSS），并且大约 9%的污泥中的 P 可以在珠粒上回收。污泥中 Fe-磷酸盐和 Fe-氧化物的减少是由于不同的机制。微生物群落分析表明，CaO 珠粒有效地富集了异化铁还原菌（DIRB）并促进了铁还原相关基因。发酵后，富含 P 的珠粒易于从污泥中分离出来以进一步回收 P，并且携带丰富的乙酸盐和 Fe 的上清液可以返回废水处理线以提高养分去除率。
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