Department of Environmental Science & Engineering, Indian Institute of Technology (Indian School of Mines), Dhanbad, Jharkhand, India.
Waste Manag Res. 2023 Feb;41(2):407-417. doi: 10.1177/0734242X221122494. Epub 2022 Sep 22.
In this study, two most common biological waste to energy conversion techniques have been analysed and compared on the basis of methane generation and energy recovery potential. The biogas generation potential has been estimated using anaerobic co-digestion experiment. The main substrate used for this study was food waste, while cow dung and anaerobic digester sludge were used as co-digestion substrates. Food waste was used because of its maximum composition (36% of total wastes) in the study area (Dhanbad city, India) with high biogas generation potential. Cow dung acted as a natural buffer, while anaerobic digester sludge was a source of active inoculum. Based on the maximum biogas yield of 402 mL g VS and annual food waste generation rate in the study area, the energy recovery potential using anaerobic digestion was estimated to be 6.59 × 10 kWh year. Presently, the wastes in the mixed form are being dumped on a large abandoned land with an approximate area of 93 ha in the outskirts of Dhanbad city in an uncontrolled manner. The annual landfill gas generation from the existing landfill has been estimated using Landfill Gas Emissions Model (LandGEM) based on the waste characteristics, anticipated landfill life and other region-specific parameters of the present study area. The maximum electrical energy recovery potential of 44.62 × 10 kWh from landfill gas has been estimated for the year 2041. Although, the results are based on the waste generation and characteristics of Dhanbad city, the comparison methodology can be applied to other cities.
在这项研究中，根据甲烷生成和能源回收潜力，对两种最常见的生物废物能源转化技术进行了分析和比较。沼气生成潜力是通过厌氧共消化实验来估计的。本研究的主要底物是食物垃圾，而牛粪和厌氧消化污泥则被用作共消化底物。之所以选择食物垃圾，是因为它在研究区域（印度丹巴德市）的最大组成部分（占总废物的 36%）具有很高的沼气生成潜力。牛粪起到天然缓冲剂的作用，而厌氧消化污泥则是活性接种物的来源。根据研究区域最大沼气产量 402 mL g VS 和每年食物垃圾产生率，使用厌氧消化的能源回收潜力估计为 6.59 × 10 kWh 年。目前，这些废物以混合形式被倾倒在丹巴德市郊区一个大约 93 公顷的废弃土地上，没有得到控制。根据垃圾特性、预期的垃圾填埋寿命和本研究区域的其他特定区域参数，使用基于垃圾特征的填埋气排放模型（LandGEM）对现有垃圾填埋场的填埋气年生成量进行了估算。从垃圾填埋气中获得的最大电能回收潜力为 44.62 × 10 kWh，这是 2041 年的估计值。尽管这些结果是基于丹巴德市的垃圾产生和特性得出的，但比较方法可以应用于其他城市。
