播种预制微藻-脱水污泥颗粒直接开发微藻-细菌颗粒污泥系统:性能及机理分析。

IF 7.7 2区 环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES Environmental Research Pub Date : 2025-02-01 DOI:10.1016/j.envres.2024.120600
Guangfeng Huang , Jian Zhang , Chunlei Zhu , David Z. Zhu
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引用次数: 0

摘要

微藻-细菌颗粒污泥(MBGS)工艺在实现碳中和和能量中和方面具有很大的潜力,但快速培养MBGS仍然是一个挑战。为了应对这一挑战,本研究提出了一种利用微藻和脱水污泥预制颗粒开发MBGS系统的新策略。结果表明,采用预制微藻脱水污泥颗粒(M-DSG)作为孕育剂可直接形成MBGS体系,M-DSG保持相对稳定的颗粒结构,最终实现化学需氧量(COD)、铵态氮(NH4+-N)和总无机氮(TIN)的去除效率分别为94.0%、99.7%和86.0%。细胞外聚合物质(EPS)在维持颗粒结构中起主导作用,而丝状细菌/藻类则提供额外的强化作用。微藻对颗粒的粘附可能依赖于紧密结合的胞外聚合物(TB-EPS)中的多糖和松散结合的胞外聚合物(LB-EPS)中的蛋白质。微生物群落分析表明,目标藻类(小球藻)仍为原生藻类,异养硝化细菌(HNB)和反硝化细菌富集。
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Direct development of microalgae-bacterial granular sludge system by seeding pre-made microalgae-dewatered sludge granules: Performance and mechanism analysis
Microalgae-bacterial granular sludge (MBGS) process has great potential in achieving carbon neutrality and energy neutrality, but rapidly cultivating MBGS remains challenging. To address this challenge, this study proposes a new strategy to develop MBGS systems using pre-made granules from microalgae and dewatered sludge. The results indicate that using pre-made microalgae-dewatered sludge granules (M-DSG) as inoculants can directly develop MBGS system, with M-DSG maintaining a relatively stable granular structure, and ultimately achieving pollutant removal efficiencies of 94.0% for chemical oxygen demand (COD), 99.7% for ammonium nitrogen (NH4+-N), and 86.0% for total inorganic nitrogen (TIN). Extracellular polymeric substances (EPS) play a dominant role in maintaining the structure of granules, while filamentous bacteria/algae provide additional reinforcement. The adhesion of microalgae to granules possibly relies on polysaccharides in tightly bound extracellular polymeric substances (TB-EPS) and proteins in loosely bound extracellular polymeric substances (LB-EPS). Microbial community analysis reveals that the target algae (Chlorella) remain the primary algae, and heterotrophic nitrifying bacteria (HNB) and denitrifying bacteria are enriched.
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来源期刊
Environmental Research
Environmental Research 环境科学-公共卫生、环境卫生与职业卫生
CiteScore
12.60
自引率
8.40%
发文量
2480
审稿时长
4.7 months
期刊介绍: The Environmental Research journal presents a broad range of interdisciplinary research, focused on addressing worldwide environmental concerns and featuring innovative findings. Our publication strives to explore relevant anthropogenic issues across various environmental sectors, showcasing practical applications in real-life settings.
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