优化水热炭对城市有机生活垃圾厌氧消化产沼气和甲烷的效果。
Optimizing the effect of hydrochar on anaerobic digestion of organic fraction municipal solid waste for biogas and methane production.
作者信息
Ghasemzadeh Reza, Abdoli Mohammad Ali, Bozorg-Haddad Omid, Pazoki Maryam
机构信息
Faculty of Environment, College of Environmental Engineering, University of Tehran, Tehran, Iran.
Department of Irrigation & Reclamation Engineering, Faculty of Agricultural Engineering & Technology, College of Agriculture & Natural Resources, University of Tehran, Karaj, Tehran, Iran.
出版信息
J Environ Health Sci Eng. 2022 Mar 9;20(1):29-39. doi: 10.1007/s40201-021-00751-5. eCollection 2022 Jun.
BACKGROUND
Anaerobic digestion (AD) is the biological waste treatment method for the organic fraction of municipal solid waste (OFMSW). AD is notable for its ability to reduce volume and produce biogas from waste. However, the conventional AD of OFMSW has a low degradation rate. In recent years, some treatment method has been used to promote the biogas and methane production of AD. One of these methods is hydrothermal carbonization (HTC).
PURPOSE
This study aimed to evaluate the effect of hydrothermal carbonization (HTC) temperature and hydrochar: OFMSW ratio as factors on biogas production, methane production, and methane content of anaerobic digestion (AD) as responses was investigated.
METHODS
This study determined the biomethane potential of raw and pretreated OFMSW (hydrochars) in 118 ml serum glass bottles. Based on the Hansen method, all tests were conducted at mesophilic temperature (37 ± 1 °C) in an incubator for 45 days. The response surface method and central composite model were used for designing experimental conditions. Quadratic models were used to estimate the correlation between factors and responses. Also, the optimal conditions for maximizing responses were determined.
RESULTS
Biogas production of mixing hydrochar and OFMSW was 41% more than control groups which contained OFMSW and inoculum. The optimal operating conditions to maximize all responses were applied in HTC temperature and hydrochar: OFMSW ratio of 179.366 °C and 2.406, respectively. In this condition, the maximum biogas production, methane production, and methane content were 394 mL/g VS, 284.351 mL/g VS, and 73.176%, respectively.
CONCLUSION
As an OFMSW HTC pretreatment for AD, hydrochar additive has a significantly positive and negative effect on biogas production, methane production, and methane content of biogas depending on operating conditions. Therefore. It is necessary to consider the individual and interaction effects of the temperature and hydrochar: OFMSW ratio, obtain the optimal conditions and determine responses.
背景
厌氧消化（AD）是处理城市固体废弃物有机组分（OFMSW）的生物处理方法。AD以其减少废弃物体积并产生沼气的能力而闻名。然而，传统的OFMSW厌氧消化降解率较低。近年来，一些处理方法已被用于促进厌氧消化的沼气和甲烷产量。水热碳化（HTC）就是其中一种方法。
目的
本研究旨在评估水热碳化（HTC）温度和水热炭与OFMSW的比例作为影响因素对厌氧消化（AD）的沼气产量、甲烷产量和甲烷含量这些响应指标的作用。
方法
本研究在118毫升血清玻璃瓶中测定了未处理和预处理后的OFMSW（水热炭）的生物甲烷潜力。基于汉森方法，所有试验在培养箱中中温（37±1°C）条件下进行45天。采用响应面法和中心复合模型设计实验条件。使用二次模型估计因素与响应之间的相关性。此外，还确定了使响应最大化的最佳条件。
结果
混合水热炭和OFMSW的沼气产量比含有OFMSW和接种物的对照组高出41%。使所有响应最大化的最佳操作条件分别为HTC温度179.366°C和水热炭与OFMSW的比例2.406。在此条件下，最大沼气产量、甲烷产量和甲烷含量分别为394毫升/克挥发性固体、284.351毫升/克挥发性固体和73.176%。
结论
作为OFMSW用于厌氧消化的HTC预处理，根据操作条件，水热炭添加剂对沼气产量、甲烷产量和沼气中的甲烷含量有显著的正负影响。因此，有必要考虑温度和水热炭与OFMSW比例的单独及交互作用，获得最佳条件并确定响应情况。
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