College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China; Department of Population Health and Reproduction, Veterinary Medicine School, University of California, Davis, CA 95616, USA.
College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China.
Waste Manag. 2021 Jun 15;129:47-53. doi: 10.1016/j.wasman.2021.05.010. Epub 2021 May 21.
Anaerobic digestion of organic residues has the potential to significantly contribute to a shift from fossil to renewable energy, while the remaining biogas digestate need to be treated or used for a second time. In this study, the pig manure biogas digestate (PMBD) was evaluated as a potential part of seedling substrates and composting was considered a pretreating method to improve its characters. Composting was carried out firstly in a forced aeration composting system (100 L), in which perlite and sawdust were used as additives in different proportions separately or together. Based on the comparison of the physicochemical characters of different seedling substrates formulas mixed with PMBD or pig manure biogas digestate pretreated by composting (CPMBD), selected seedling substrates were analyzed by bioassay experiment. The results showed that pretreatment by composting and the additives (perlite and sawdust) used in composting decreased the pH value of PMBD and make it suitable for seedling substrates, especially composted with perlite and sawdust. Both PMBD and CPMBD with low proportion in the substrates improved plant growth of lettuce and tomato, while CPMBD was better than PMBD. However, when the proportions of PMBD was increased more than 20% and CPMBD was increased more than 40%, plant growth inhibition was observed. Tomato was more sensitive than lettuce to the physicochemical characters of the substrate. In summary, PMBD pretreated by composting not only increases the uses of digestate, but also enhances plant growth and hence yield.
有机废物的厌氧消化有潜力从根本上改变能源结构，从化石能源向可再生能源转变，而剩余的沼气消化物需要进行处理或二次利用。在本研究中，猪粪沼气消化物（PMBD）被评估为潜在的育苗基质的一部分，而堆肥被认为是一种预处理方法，以改善其特性。堆肥首先在强制通风堆肥系统（100L）中进行，其中珍珠岩和木屑分别以不同的比例或混合使用作为添加剂。基于不同 PMBD 或经过堆肥预处理的猪粪沼气消化物（CPMBD）与育苗基质混合后的理化特性的比较，选择的育苗基质通过生物测定实验进行了分析。结果表明，堆肥预处理和堆肥中使用的添加剂（珍珠岩和木屑）降低了 PMBD 的 pH 值，使其适合作为育苗基质，特别是与珍珠岩和木屑混合的堆肥。在基质中添加低比例的 PMBD 和 CPMBD 都能促进生菜和番茄的生长，而 CPMBD 优于 PMBD。然而，当 PMBD 的比例增加到 20%以上，CPMBD 的比例增加到 40%以上时，观察到植物生长受到抑制。番茄对基质的理化特性比生菜更敏感。综上所述，经过堆肥预处理的 PMBD 不仅增加了消化物的利用率，而且增强了植物的生长和产量。
