Effect of attapulgite on heavy metals passivation and microbial community during co-composting of river sediment with agricultural wastes.
Effect of attapulgite on heavy metals passivation and microbial community during co-composting of river sediment with agricultural wastes.
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DOI：
10.1016/j.chemosphere.2022.134347
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发表时间：
2022-07-01
期刊：
影响因子：
8.8
通讯作者：
Luo, Xinli
中科院分区：
文献类型：
--
作者：
Chen, Yaoning;Tang, Ping;Luo, Xinli
本文研究了添加适量的有机肥对农业废弃物和底泥堆肥过程中理化过程、重金属转化和微生物群落的影响。此外，环境因子，重金属（HMs）和微生物群落之间的相关性进行了评估冗余分析（RDA）。结果表明，添加过氧化氢的B堆比对照A堆进入高温期的时间早，持续时间长。HMs（Cr、Cd和Zn）生物有效性的降低在堆B中也更大，并且HMs的钝化排序为Cd>Zn>Cr。变形菌门，厚壁菌门，拟杆菌门和放线菌门的相对丰度是最高的整个堆肥过程。RDA结果表明，A堆细菌群落组成与温度和C/N呈显著相关，而B堆细菌群落组成与有机质和pH呈显著相关。添加β-内酰胺酶有利于HMs被假单胞菌转化为更稳定的组分。该研究可为生物修复技术应用于重金属污染河流底泥的修复提供参考。
This paper investigated the effects of attapulgite addition on the physicochemical processes, heavy metal transformation, and microbial community during the composting of agricultural wastes and sediment. In addition, the correlation between environmental factors, heavy metals (HMs), and microbial community was also assessed by redundancy analysis (RDA). The results showed that pile B with attapulgite addition entered the thermophilic phase earlier and lasted longer than pile A as the control group. The reduction in the bioavailability of HMs (Cr, Cd, and Zn) was also greater in pile B, and the passivation of HMs was ranked as Cd>Zn>Cr. The relative abundance of phylum Proteobacteria, Firmicutes, Bacteroidetes, and Actinobacteria was the highest throughout the composting process. Furthermore, the RDA showed that the bacterial community composition was significantly correlated with temperature and C/N ratio in pile A, while significantly correlated with organic matter and pH in pile B. And the addition of attapulgite facilitated the conversion of HMs into more stable fractions by Pseudomonas. The study would provide a reference for the application of attapulgite to remediate the river sediment polluted by HMs.