Jiménez J, Cisneros-Ortiz M E, Guardia-Puebla Y, Morgan-Sagastume J M, Noyola A
Universidad de Sancti Spíritus. Ave. de los Mártires, No. 360, Sancti Spíritus, Cuba E-mail:
Instituto de Ingeniería, Universidad Nacional Autónoma de México, Circuito interior, México D.F.
Water Sci Technol. 2014;69(12):2381-8. doi: 10.2166/wst.2014.109.
The anaerobic co-digestion of three wastes (manure, rice straw and clay residue, an inorganic additive) at different concentration levels and their interactive effects on methanogenic activity were investigated in this work at thermophilic conditions in order to enhance hydrolytic activity and methane production. A central composite design and the response surface methodology were applied for the optimization of specific methanogenic activity (SMA) by assessing their interaction effects with a reduced number of experiments. The results showed a significant interaction among the wastes on the SMA and confirmed that co-digestion enhances methane production. Rice straw apparently did not supply a significant amount of substrate to make a difference in SMA or methane yield. On the other hand, clay residue had a positive effect as an inorganic additive for stimulating the anaerobic process, based on its mineral content and its adsorbent properties for ammonia. Finally, the optimal conditions for achieving a thermophilic SMA value close to 1.4 g CH4-COD/g VSS · d(-1) were 20.3 gVSS/L of manure, 9.8 gVSS/L of rice straw and 3.3 gTSS/L of clay.
为了提高水解活性和甲烷产量，本研究在嗜热条件下，对三种废弃物（粪便、稻草和粘土残渣，一种无机添加剂）在不同浓度水平下的厌氧共消化及其对产甲烷活性的交互作用进行了研究。采用中心复合设计和响应面方法，通过评估它们的相互作用效应，以较少的实验次数优化比产甲烷活性（SMA）。结果表明，这些废弃物对SMA有显著的交互作用，并证实共消化可提高甲烷产量。稻草显然没有提供大量的底物来影响SMA或甲烷产量。另一方面，基于其矿物质含量及其对氨的吸附特性，粘土残渣作为一种无机添加剂对刺激厌氧过程有积极作用。最后，实现接近1.4 g CH4-COD/g VSS·d（-1）的嗜热SMA值的最佳条件为：粪便20.3 gVSS/L、稻草9.8 gVSS/L和粘土3.3 gTSS/L。
