The improvement in methane production, nutrient removal, and heavy metal passivation during anaerobic digestion of chicken manure: The role of modified porous materials

IF 3.5 4区工程技术 Q3 ENERGY & FUELS

Biomass Conversion and Biorefinery Pub Date : 2024-10-01 DOI:10.1007/s13399-024-06210-z

Xiaoliang Luo, Cunlan Liu, Jun Wang, Mingguo Peng, Rongyan Shen, Wenyi Zhang, Linqiang Mao

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引用次数: 0

Abstract

With the expansion of poultry farming, large amounts of unabsorbed nutrients and heavy metals (HMs) in chicken manure are released, causing environmental pollution. Anaerobic digestion (AD), as a common, harmless, and resourceful treatment method, faces challenges with high-concentration harmful substances, necessitating improvements in the treatment effect. This study explored the application of a modified external porous passivator (EPP) in the AD of chicken manure (CM) and corn straw (CS), focusing on pH adjustment, methane production, nutrient element removal, and heavy metal (HM) passivation. There were 9 kinds of modified EPP prepared by loading Mg, Fe, and humic acid (HS) onto the surfaces of attapulgite (AT), biochar (BC), and zeolite (ZO) using the impregnation-baking method. Modifications with Fe- and HS-modified EPP significantly increased methane yields by up to 76.52%. Mg-modified EPP excelled in removing nitrogen (N) and phosphorus (P), with reductions exceeding 47.69% for total nitrogen (TN), 31.95% for total ammonia nitrogen (TAN), 78.55% for total phosphorus (TP), and 83.76% for total phosphate (TPS). Mg modifications notably improved passivation efficiencies for Cu and Zn to 12.03% and 24.73%. Structural modifications, chemical enhancements from new elemental incorporations, and changes in surface charge, significantly boosted adsorption capacities for nutrients and heavy metals (HMs). These improvements underscore the potential of modified EPP in optimizing AD processes, offering substantial benefits in energy recovery and environmental pollution mitigation.

Graphical Abstract

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改良多孔材料对鸡粪厌氧消化过程中甲烷生成、营养物去除和重金属钝化的改善作用

随着家禽养殖业的扩大，大量未吸收的营养物质和鸡粪中的重金属被释放出来，造成环境污染。厌氧消化（AD）作为一种常见的、无害的、资源丰富的处理方法，面临着高浓度有害物质的挑战，需要提高处理效果。本研究探讨了改性外孔钝化剂（EPP）在鸡粪（CM）和玉米秸秆（CS） AD中的应用，重点研究了pH调节、甲烷生成、营养元素去除和重金属（HM）钝化。采用浸渍-焙烧法在凹凸棒石（AT）、生物炭（BC）和沸石（ZO）表面加载Mg、Fe和腐植酸（HS），制备了9种改性EPP。Fe-和hs -改性EPP可显著提高甲烷产率，最高可达76.52%。mg改性EPP对氮(N)和磷(P)的去除效果较好，对总氮（TN）、总氨氮（TAN）、总磷（TP）和总磷（TPS）的去除效果分别达到47.69%、31.95%、78.55%和83.76%。Mg改性显著提高了Cu和Zn的钝化效率，分别达到12.03%和24.73%。结构改变、新元素掺入的化学增强以及表面电荷的变化显著提高了对营养物和重金属的吸附能力。这些改进强调了改良EPP在优化AD工艺方面的潜力，在能源回收和减轻环境污染方面提供了实质性的好处。图形抽象

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来源期刊

Biomass Conversion and Biorefinery Energy-Renewable Energy, Sustainability and the Environment

CiteScore

7.00

自引率

15.00%

发文量

1358

期刊介绍： Biomass Conversion and Biorefinery presents articles and information on research, development and applications in thermo-chemical conversion; physico-chemical conversion and bio-chemical conversion, including all necessary steps for the provision and preparation of the biomass as well as all possible downstream processing steps for the environmentally sound and economically viable provision of energy and chemical products.