Δ-MnO2 changed the structure of humic-like acid during co-composting of chicken manure and rice straw. (1st June 2021)

• Record Type: Journal Article
• Authors: Qi, Haishi; Zhang, An; Du, Zhuang; Wu, Junqiu; Chen, Xiaomeng; Zhang, Xu; Zhao, Yue; Wei, Zimin; Xie, Xinyu; Li, Yue; Ye, Min
• Is Part Of: Waste management. Volume 128(2021)
• Page Start: 16
• Page End: 24
• Publication Date: 2021-06-01
• Subjects: Compost -- Humic acid -- Fulvic acid -- δ-MnO2 -- Agriculture organic waste; CK Control check -- M Treatment group with δ-MnO2 -- FA Fulvic acid -- HA Humic acid -- AOSW Agriculture organic solid waste -- OM Organic matter -- HP Heating phase -- TP Thermophilic phase -- CP Cooling phase -- MP Maturity phase -- Fmax Maximum fluorescence intensity -- DGGE Denaturing Gradient Gel Electrophoresis -- H′ Shannon- Wiener index -- PARAFAC Parallel factor analysis -- 2DCOS Two-dimensional correlation spectra -- SEM Structural equation model -- NMDS Nonmetric multidimensional scaling -- C1 Component 1 -- C2 Component 2 -- C3 Component 3; Hazardous wastes -- Periodicals; Refuse and refuse disposal -- Periodicals; 363.728
• DOI: 10.1016/j.wasman.2021.04.039
• Languages: English
• ISSNs: 0956-053X

Abstract

Graphical abstract: Highlights: The degradation of organic matter is accelerated by the addition of MnO2 . Humification degree of fulvic acid is increased by adding MnO2 . The MnO2 enhances the biological activities of humic acid in co-composting. The role of microorganism on the formation of humic-like acid are identified. Abstract: Improving the structure and quantity of humus is important to reduce agriculture organic waste by composting. The present study was aimed to assess the role of δ-MnO2 on humus fractions formation during co-composting of chicken manure and rice straw. Two tests (control group (CK), the addition of δ-MnO2 (M)) were carried out. The results showed that organic matter content decreased by 34% and 29% at M and CK, suggesting the process of organic waste disposal was accelerated by adding δ-MnO2 . The structures and quantity of fulvic acid (FA) and humic acid (HA) (as the main fractions of humus) were investigated. The δ-MnO2 had no significant effect on improving the concentration of FA and HA ( p > 0.05 ). However, the addition of δ-MnO2 caused different effects on the FA and HA structure. The humification degree of FA improved, while bioavailability of HA increased through adding δ-MnO2 . The addition of δ-MnO2 rephased the bacterial community structure, slowing down the succession rate of the bacterial community in M composting. After adding δ-MnO2, the structural equation modeling results showed that environmental factors could directly drive changes in FA and HA by modulating the bacterial community. Furthermore, the role of FA and HA in the soil amendment was also demonstrated. Therefore, the addition of MnO2 might be promising for agriculture organic waste treatment and environmental repair during composting.