School of Civil Engineering, Chang'an University, Xi'an 710054, China; State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China.
School of Civil Engineering, Chang'an University, Xi'an 710054, China.
Water Sci Technol. 2024 Aug;90(3):1070-1081. doi: 10.2166/wst.2024.255. Epub 2024 Jul 23.
The utilization of for the production of bio-CaCO in concrete crack repair and strength enhancement has attracted considerable attention. However, microbial-induced calcium carbonate precipitation (MICP) has yet to be explored as a precedent with activated sludge. Here calcium sourced from concrete slurry waste (CSW) and carbon from sludge microbial β-oxidation under alkaline were used to generate micro/nano CaCO. The results indicate that the main crystalline form of the generated precipitated particles is calcite, with a particle size ranging from 0.7 to 10 μm. Minimal heavy metals were found in the supernatant following settling. And at the optimum pH of 8.5-9, carbon capture reached 743 mg L, and CaCO production reached 1,191 mg L, and dominant phylum were and , with being a prevalent genus adept in β-oxidation. Mass balance analysis showed that alkali promotes microbial β-oxidation of organisms to produce CO and facilitate storage. Thus, the alkaline regulation of metabolism between microbe and CSW provides a novel way of sludge to initiate MICP.
利用 将生物碳酸钙应用于混凝土裂缝修复和强度增强已引起广泛关注。然而，微生物诱导碳酸钙沉淀（MICP）在活性污泥中的应用尚未得到探索。在这里，利用混凝土浆废料（CSW）中的钙和碱性条件下污泥微生物β-氧化产生的碳来生成微/纳米 CaCO。结果表明，生成的沉淀颗粒的主要结晶形式是方解石，粒径在 0.7 到 10 微米之间。沉降后上清液中重金属含量很少。在最佳 pH 值为 8.5-9 时，碳捕获量达到 743 mg/L，碳酸钙产量达到 1191 mg/L，优势菌门为 和 ，其中 是擅长β-氧化的优势属。质量平衡分析表明，碱促进了微生物对有机物的β-氧化，产生 CO，有利于储存。因此，微生物和 CSW 之间代谢的碱性调节为污泥启动 MICP 提供了一种新方法。
