Feng Xueqing, Zhang Lu
College of Forestry, Beijing Forestry University, Beijing 100083, PR China.
College of Forestry, Beijing Forestry University, Beijing 100083, PR China.
Sci Total Environ. 2022 Dec 15;852:158326. doi: 10.1016/j.scitotenv.2022.158326. Epub 2022 Aug 28.
Composting, as an eco-friendly method to recycle green waste (GW), converts the GW into humus-like compounds. However, conventional GW composting is inefficient and generates poor-quality compost. The objective of this research was to investigate the effects of the combined additions of biochar (BC; 0, 5, and 10 %), lactic acid (LA; 0, 0.5, and 1.0 %), and pond sediment (PS; 0, 20, and 30 %) on GW composting. A treatment without additives served as the control (treatment T1). The results showed that treatment R1 (with 5 % BC, 0.5 % LA, and 20 % PS) was better than the treatments with two additives or no additive and required only 32 days to generate a stable and mature product. Compared with T1, R1 improved water-holding capacity, electrical conductivity, available phosphorus, available potassium, nitrate nitrogen, OM decomposition, and germination index by 51 %, 48 %, 170 %, 93 %, 119 %, 157 %, and 119 %, respectively. R1 also increased the activities of cellulase, lignin peroxidase, and laccase. The results showed that the combined addition of BC, LA, and PS increased the gas exchange, water retention, and the microbial secretion of enzymes, thus accelerating the decomposition of GW. This study demonstrated the effects of BC, LA, and PS addition on GW composting and final compost properties, and analyzed the reasons of the effects. The study therefore increases the understanding of the sustainable disposal of an important solid waste.
堆肥作为一种回收绿色废弃物（GW）的环保方法，可将绿色废弃物转化为类似腐殖质的化合物。然而，传统的绿色废弃物堆肥效率低下，且产生的堆肥质量较差。本研究的目的是探究生物炭（BC；添加量分别为0%、5%和10%）、乳酸（LA；添加量分别为0%、0.5%和1.0%）和池塘沉积物（PS；添加量分别为0%、20%和30%）联合添加对绿色废弃物堆肥的影响。不添加任何添加剂的处理作为对照（处理T1）。结果表明，处理R1（添加5%生物炭、0.5%乳酸和20%池塘沉积物）优于添加两种添加剂或不添加添加剂的处理，仅需32天就能生成稳定且成熟的产品。与T1相比，R1的持水能力、电导率、有效磷、有效钾、硝态氮、有机物质分解率和发芽指数分别提高了51%、48%、170%、93%、119%、157%和119%。R1还提高了纤维素酶、木质素过氧化物酶和漆酶的活性。结果表明，生物炭、乳酸和池塘沉积物的联合添加增加了气体交换、保水能力以及微生物的酶分泌，从而加速了绿色废弃物的分解。本研究证明了添加生物炭、乳酸和池塘沉积物对绿色废弃物堆肥及最终堆肥性质的影响，并分析了影响的原因。因此，该研究增进了人们对一种重要固体废弃物可持续处置的理解。
