Production and characterization of H2S and PO43− carbonaceous adsorbents from anaerobic digested fibers
Production and characterization of H2S and PO43− carbonaceous adsorbents from anaerobic digested fibers
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DOI：
10.1016/j.biombioe.2018.11.028
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发表时间：
2019-01
影响因子：
6
通讯作者：
Michael Ayiania;Felix Martin Carbajal-Gamarra;Tsai Garcia-Perez;C. Frear;Waled Suliman;M. Garcia-Perez
中科院分区：
文献类型：
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作者：
Michael Ayiania;Felix Martin Carbajal-Gamarra;Tsai Garcia-Perez;C. Frear;Waled Suliman;M. Garcia-Perez
厌氧消化是利用牛粪生产沼气的重要技术。虽然奶牛粪便的AD导致粪便中所含能量的利用，但大多数营养物质（磷和氮）仍保留在液体流出物中，这是一个重要的污染源。此外，产生的沼气含有H2S和CO2，限制了其作为燃料的实际用途。在本文中，我们报告了AD纤维的碳质吸附剂的生产和使用，用于从生物气中去除硫化氢（H2S）和从含水液体流出物中去除磷酸盐（PO43−）。所研究的吸附剂是通过在350和800 °C之间的低温热解，然后通过CO2活化来生产的。的元素和工业分析，表面积和孔径分布的每一个吸附剂的研究报告。使用H2S穿透和PO43−批次平衡测试评估它们的吸附能力。H2S的吸附容量在21.9和51.2 mg g− 1之间变化，PO43−的吸附容量在4.9 mg g− 1和37.4 mg g− 1之间变化。研究的市售活性炭吸附了23.1 mg g−1H2S和15.7 mg g−1PO43−。结果表明，H2S和PO43−化合物的保留取决于灰分含量，表面积和pH值。H2S和PO43−吸附的吸附机理提出。
Anaerobic digestion (AD) is an important technology to produce biogas from dairy manure. Although the AD of dairy manure results in the harnessing of the energy contained in manure, most of the nutrients (phosphorous and nitrogen) remain in the liquid effluent, representing an important source of pollution. Additionally, the biogas produced contains H2S and CO2, limiting its practical use as fuel. In this paper, we report the production and use of a carbonaceous adsorbent from AD fibers for the removal of hydrogen sulfide (H2S) from biogas and phosphate (PO43−) from aqueous liquid effluents. The adsorbents studied were producedviaslow pyrolysis between 350 and 800 °C followed by CO2activation. The elemental and proximate analyses, surface area and pore size distribution of each of the adsorbents studied are reported. Their adsorption capacities were assessed using H2S breakthrough and PO43−batch equilibrium tests. The sorption capacity varied between 21.9 and 51.2 mg g−1for H2S and between 4.9 mg g−1and 37.4 mg g−1for PO43−. Commercially available activated carbon studied adsorbed 23.1 mg g−1H2S and 15.7 mg g−1PO43−. The results show that the retention of H2S and PO43−compounds were governed by the ash content, surface area and pH. Adsorption mechanisms for H2S and PO43−sorption are proposed.