Institut Universitari d'Investigació d'Enginyeria de l'Aigua i Medi Ambient, IIAMA, Universitat Politècnica de València, Camí de Vera, s/n, 46022 València, Spain.
Departament d'Enginyeria Química, Escola Tècnica Superior d'Enginyeria, Universitat de València, Doctor Moliner 50, 46100 Burjassot, València, Spain.
Waste Manag. 2016 Oct;56:158-65. doi: 10.1016/j.wasman.2016.07.021. Epub 2016 Jul 18.
Food waste was characterized for its potential use as substrate for anaerobic co-digestion in a submerged anaerobic membrane bioreactor pilot plant that treats urban wastewater (WW). 90% of the particles had sizes under 0.5mm after grinding the food waste in a commercial food waste disposer. COD, nitrogen and phosphorus concentrations were 100, 2 and 20 times higher in food waste than their average concentrations in WW, but the relative flow contribution of both streams made COD the only pollutant that increased significantly when both substrates were mixed. As sulphate concentration in food waste was in the same range as WW, co-digestion of both substrates would increase the COD/SO4-S ratio and favour methanogenic activity in anaerobic treatments. The average methane potential of the food waste was 421±15mLCH4g(-1)VS, achieving 73% anaerobic biodegradability. The anaerobic co-digestion of food waste with WW is expected to increase methane production 2.9-fold. The settleable solids tests and the particle size distribution analyses confirmed that both treatment lines of a conventional WWTP (water and sludge lines) would be clearly impacted by the incorporation of food waste into its influent. Anaerobic processes are therefore preferred over their aerobic counterparts due to their ability to valorise the high COD content to produce biogas (a renewable energy) instead of increasing the energetic costs associated with the aeration process for aerobic COD oxidation.
食物垃圾具有作为基质用于处理城市废水（WW）的浸没式厌氧膜生物反应器中进行厌氧共消化的潜力。在商业食物垃圾处理机中研磨食物垃圾后，90%的颗粒尺寸小于 0.5mm。食物垃圾中的 COD、氮和磷浓度分别比 WW 中的平均浓度高出 100、2 和 20 倍，但这两种基质的相对流量贡献使得 COD 成为唯一显著增加的污染物，当两种基质混合时。由于食物垃圾中的硫酸盐浓度与 WW 相同，因此两种基质的共消化将增加 COD/SO4-S 比，并有利于厌氧处理中的产甲烷活性。食物垃圾的平均甲烷潜力为 421±15mLCH4g(-1)VS，达到 73%的厌氧生物降解性。预计 WW 中食物垃圾的厌氧共消化将使甲烷产量增加 2.9 倍。可沉降固体测试和颗粒尺寸分布分析证实，传统 WWTP（水和污泥线）的两条处理线都会受到将食物垃圾纳入其进水的明显影响。因此，由于厌氧过程能够将高 COD 含量转化为沼气（可再生能源），而不是增加与好氧 COD 氧化相关的曝气过程的能量成本，因此优先选择厌氧过程而不是好氧过程。
