Optimization of Recovery of Nutrients from Pig Manure Slurry through Combined Microbial Fuel Cell and Microalgae Treatment

IF 2.8 4区工程技术 Q2 ENGINEERING, CHEMICAL

Processes Pub Date : 2024-09-15 DOI:10.3390/pr12091989

Adrián Hernández-Fernández, Eduardo Iniesta-López, Ana Isabel Hernández Baños, Yolanda Garrido, Ana Sánchez Zurano, Francisco J. Hernández-Fernández, Antonia Pérez De los Ríos

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引用次数: 0

Abstract

Microbial fuel cells (MFCs) and microalgae–bacteria consortia represent two renewable and promising technologies of growing interest that enable wastewater treatment while obtaining high-value-added products. This study integrates MFCs and microalgae production systems to treat animal slurry, aiming to remove and recover organic and inorganic components while generating energy and producing biomass. The MFCs effectively eliminated Chemical Oxygen Demand (COD), organic nitrogen, and a portion of the suspended solids, achieving a maximum voltage of 195 mV and a power density of 87.03 mW·m−2. After pre-treatment with MFCs, the slurry was diluted to concentrations of 10%, 50%, and 100% and treated with microalgae–bacteria consortia. The results showed a biomass production of 0.51 g·L−1 and a productivity of 0.04 g·L−1·day−1 in the culture fed with 10% slurry, with significant removal efficiencies: 40.71% for COD, 97.76% for N-NH4+, 39.66% for N-NO2−, 47.37% for N-NO3−, and 94.37% for P-PO4−3. The combination of both technologies allowed for obtaining a properly purified slurry and the recovery of nutrients in the form of bioelectricity and high-value biomass. Increasing the concentration of animal slurry to be treated is essential to optimize and scale both technologies.

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通过微生物燃料电池和微藻联合处理优化猪粪泥浆中营养物质的回收

微生物燃料电池（MFCs）和微藻-细菌联合体是两种可再生且前景广阔的技术，它们在处理废水的同时还能获得高附加值的产品，因此受到越来越多的关注。本研究整合了 MFC 和微藻生产系统来处理动物粪便，旨在去除和回收有机和无机成分，同时产生能量和生物质。MFCs 能有效去除化学需氧量（COD）、有机氮和部分悬浮固体，最大电压为 195 mV，功率密度为 87.03 mW-m-2。在使用 MFC 进行预处理后，将泥浆稀释到 10% 、50% 和 100% 的浓度，并使用微藻-细菌联合体进行处理。结果表明，在以 10%泥浆为原料的培养液中，生物量产量为 0.51 g-L-1，生产率为 0.04 g-L-1-天-1，去除率显著提高：COD 去除率为 40.71%，N-NH4+ 去除率为 97.76%，N-NO2- 去除率为 39.66%，N-NO3- 去除率为 47.37%，P-PO4-3 去除率为 94.37%。将这两种技术结合起来，可以获得适当净化的泥浆，并以生物电和高价值生物质的形式回收养分。提高待处理动物泥浆的浓度对于优化和推广这两种技术至关重要。

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来源期刊

Processes Chemical Engineering-Bioengineering

CiteScore

5.10

自引率

11.40%

发文量

2239

审稿时长

14.11 days

期刊介绍： Processes (ISSN 2227-9717) provides an advanced forum for process related research in chemistry, biology and allied engineering fields. The journal publishes regular research papers, communications, letters, short notes and reviews. Our aim is to encourage researchers to publish their experimental, theoretical and computational results in as much detail as necessary. There is no restriction on paper length or number of figures and tables.