The Institute of Environment, Resources, Soil and Fertilizers, Zhejiang Academy of Agricultural Sciences, Hangzhou 310021, China.
The Institute of Environment, Resources, Soil and Fertilizers, Zhejiang Academy of Agricultural Sciences, Hangzhou 310021, China.
Waste Manag. 2020 Jul 15;113:1-11. doi: 10.1016/j.wasman.2020.05.025. Epub 2020 Jun 2.
Composting is a sustainable means of managing organic waste, and solar composters offer a viable solution in rural areas lacking connection to municipal power supplies. This study tracked the physicochemical and microbiological changes that occur in a solar composting greenhouse during the treatment of food and green cellulosic waste in fed-batch mode, which remain poorly understood. Solar composting greenhouse performed well on waste reduction and nutrient retention, resulting in a 45.0-58.8% decrease in feedstock volume over 12-day composting cycles, a 41% removal in dry matter after three batches of composting, and 29.5%, 252.9% and 96.6% increase in the nitrogen, phosphorus and potassium content respectively after 42 days of composting. Batch feeding and composting jointly influenced microbiological succession by altering the physicochemical properties of compost. The contents of nitrogen and phosphorus, pH, and electrical conductivity significantly accounts for variations in culturable microbial populations. The succession of dominant bacterial genera such as Lactobacillus, Pseudoxanthomonas, Bacillus, and Pseudomonas were closely related to pH, cellulose, NH-N, carbon content, and temperature. In addition, Pichia kudriavzevii, Thermomyces lanuginosus, and Scopulariopsis brevicaulis successively became the dominant fungal species during composting. Preliminary compost quality assessments showed that solar composting greenhouse has a high potentiality to transform organic waste into organic fertilizer. Additionally, corresponding purposeful suggestions were proposed for future optimization in this system, mainly from a microbiological aspect.
堆肥是一种可持续的有机废物管理方式，而太阳能堆肥器为缺乏与市政电力供应连接的农村地区提供了一种可行的解决方案。本研究跟踪了在分批进料模式下，太阳能堆肥温室中发生的物理化学和微生物变化，这些变化在处理食物和绿色纤维素废物时仍未得到很好的理解。太阳能堆肥温室在减少废物和保留营养方面表现良好，在 12 天的堆肥周期中，原料体积减少了 45.0-58.8%，经过三批堆肥后，干物质去除了 41%，经过 42 天的堆肥，氮、磷和钾的含量分别增加了 29.5%、252.9%和 96.6%。分批进料和堆肥通过改变堆肥的物理化学性质共同影响微生物的演替。氮和磷、pH 值和电导率的含量显著影响可培养微生物种群的变化。优势细菌属如乳杆菌、假单胞菌、芽孢杆菌和假单胞菌的演替与 pH 值、纤维素、NH-N、碳含量和温度密切相关。此外，毕赤酵母、毛壳菌和短梗霉在堆肥过程中相继成为优势真菌种。初步的堆肥质量评估表明，太阳能堆肥温室具有将有机废物转化为有机肥料的高潜力。此外，还从微生物角度为该系统的未来优化提出了相应的有针对性建议。
