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Optimization of a chemical scrubbing process based on a Fe-EDTA-carbonate based solvent for the simultaneous removal of CO2 and H2S from biogas
Journal of Water Process Engineering ( IF 6.3 ) Pub Date : 2020-07-07 , DOI: 10.1016/j.jwpe.2020.101476
David Marín , Marisol Vega , Raquel Lebrero , Raúl Muñoz

The potential of a novel Fe/EDTA/carbonate-based scrubbing process for the simultaneous removal of H2S and CO2 from biogas was studied by evaluating the influence of Fe/EDTA molarity (M), carbonate concentration (IC), biogas (B), air (A) and liquid (L) flow rates on biogas upgrading performance using a Taguchi L16(45) experimental design. The ANOVA demonstrated that molarity of the Fe/EDTA solution was a significant factor influencing H2S concentration (0.035 % at 0.00 M to 0.000 % at 0.05 M). IC impacted on the concentrations of CO2 (13.1 and 4.5 % at 4000 and 10,000 mg L−1, respectively), N2 and CH4 (85.9 and 94.5 % at 4000 and 10,000 mgIC L−1, respectively). The biogas flow rate affected the concentrations of CO2 (2.5 to 13.8% at 10 and 40 mL min−1, respectively), O2, N2 and CH4 (95.9 to 85.4% at 10 and 40 mL min−1, respectively). Likewise, the recycling liquid flow rate affected CO2 (8.3 and 5.9 % at 5 and 30 mL min−1, respectively), O2, N2 and CH4 (90.5 and 93.3 % at 5 and 40 mL min−1, respectively) concentrations. Finally, the air flow rate impacted on CO2 (10.8 and 6.7 % at 800 and 1000 mL min−1, respectively), H2S, N2 and CH4 (87.9 and 92.2 % at 800 and 1000 mL min−1, respectively) concentrations. Process optimization provided the optimal conditions for each control factor. Continuous biogas upgrading operation at M2-IC1-B2-A4-L4 (0.05 M, 10,000 mgIC L−1, 10 mL min−1, 1000 mL min−1 and 30 mL min−1, respectively) provided CH4, CO2, O2, N2 and H2S concentration in the upgrading biogas of 97.4, 1.4, 0.29, 0.97 and 0%, respectively, which complied with biomethane regulations.



中文翻译:

基于Fe-EDTA-碳酸酯基溶剂的化学洗涤工艺的优化,可同时从沼气中去除CO 2和H 2 S

通过评估Fe / EDTA摩尔浓度(M),碳酸盐浓度(IC),沼气(Fe / EDTA /碳酸盐/碳酸盐基洗涤法)同时去除沼气中H 2 S和CO 2的潜力,研究了其潜在的同时去除沼气中H 2 S和CO 2的潜力。B),使用Taguchi L 16(4 5)实验设计的空气(A)和液体(L)流速对沼气提升性能的影响。方差分析表明,Fe / EDTA溶液的摩尔浓度是影响H 2 S浓度的重要因素(0.00 M为0.035%,0.05 M为0.000%)。IC对CO 2(4000和10,000 mg L -1分别为13.1和4.5%),N 2和CH 4的浓度产生影响(在4000和10,000 mgIC L -1时分别为85.9和94.5%)。沼气流速影响CO 2(分别在10和40 mL min -1时为2.5至13.8%),O 2,N 2和CH 4(在10和40 mL min -1时分别为95.9至85.4%)的浓度)。同样,循环液流速影响了CO 2(分别在5和30 mL min -1时分别为8.3和5.9%),O 2,N 2和CH 4(在5和40 mL min -1时分别为90.5和93.3%))浓度。最后,空气流速对CO 2有影响(分别在800和1000 mL min -1时分别为10.8%和6.7%),H 2 S,N 2和CH 4(在800和1000 mL min -1时分别为87.9和92.2%)浓度。工艺优化为每个控制因素提供了最佳条件。连续沼气在M个操作升级2 -IC 1 -B 2 -A 4 -L 4(0.05M,万MGIC大号-1,10毫升分钟-1,1000毫升分钟-1和30mL分钟-1分别)设置CH 4,CO 2,O 2,N 2提质沼气中的H 2 S和H 2 S浓度分别为97.4%,1.4%,0.29%,0.97%和0%,符合生物甲烷法规。

更新日期:2020-07-07
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