利用富含蛋白质的生物质作为共发酵底物的新方法，以提高含 FePs 污泥中的磷回收。
A novel approach using protein-rich biomass as co-fermentation substrates to enhance phosphorus recovery from FePs-bearing sludge.
机构信息
State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai, 200092, China.
State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai, 200092, China; Shanghai Institute of Pollution Control and Ecological Security, Shanghai, 200092, China.
出版信息
Water Res. 2022 Jun 30;218:118479. doi: 10.1016/j.watres.2022.118479. Epub 2022 Apr 19.
A novel approach for the enhancement of phosphorus (P) recovery from Fe bound P compounds (FePs)-bearing sludge by co-fermentation with protein-rich biomass (PRB) is reported. Four PRBs (silkworm chrysalis meal, fish meal, corn gluten meal, and soya bean meal) were used for co-fermentation. The results revealed that PRBs with strong surface hydrophobicity and loose structure favored the hydrolysis and acidogenesis processes. Sulfide produced by PRB could react with FePs to form FeS and promote P release. Due to the neutralization of volatile fatty acids (VFAs) by a relatively high concentration of ammonia, the pH was maintained near neutral and thus prevented the dissolution of metal ions (e.g., Fe and Ca). This was beneficial to save the cost of subsequent P recovery and form high-purity struvite. Compared with the control, the soluble orthophosphate and VFAs increased by 88.3% and 531.3%, respectively, in the co-fermentation system with silkworm chrysalis meal. Cysteine was the important intermediate. The metagenomics analysis indicated that the gene abundances of phosphate acetyltransferase and acetate kinase, which were key enzymes in the acetate metabolism, increased by 117.7% and 52.2%, respectively. The gene abundances of serine O-acetyltransferase and cysteine synthase increased by 63.4% and 54.4%, respectively. Cysteine was primarily transformed to pyruvate and sulfide. This study provides an environment-friendly strategy to simultaneously recover P and VFAs resources from FePs-bearing sludge and PRB waste.
一种从含有铁结合磷化合物（FePs）的污泥中同时回收磷（P）和挥发性脂肪酸（VFAs）资源的新方法，即与富含蛋白质的生物质（PRB）共发酵。使用了四种 PRB（蚕蛹粉、鱼粉、玉米蛋白粉和豆粕）进行共发酵。结果表明，具有强表面疏水性和疏松结构的 PRB 有利于水解和产酸过程。PRB 产生的硫化物可以与 FePs 反应生成 FeS，促进 P 的释放。由于 PRB 中较高浓度的氨中和了挥发性脂肪酸（VFAs），因此 pH 值维持在接近中性，从而防止了金属离子（如 Fe 和 Ca）的溶解。这有利于节省后续 P 回收的成本，并形成高纯度的鸟粪石。与对照组相比，在含有蚕蛹粉的共发酵系统中，可溶正磷酸盐和 VFAs 分别增加了 88.3%和 531.3%。半胱氨酸是重要的中间产物。宏基因组学分析表明，在乙酸代谢中起关键作用的磷酸乙酰转移酶和乙酸激酶的基因丰度分别增加了 117.7%和 52.2%。丝氨酸 O-乙酰转移酶和半胱氨酸合酶的基因丰度分别增加了 63.4%和 54.4%。半胱氨酸主要转化为丙酮酸和硫化物。该研究为从含有 FePs 的污泥和 PRB 废物中同时回收 P 和 VFAs 资源提供了一种环保策略。
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