Pretreatment by composting increased the utilization proportion of pig manure biogas digestate and improved the seedling substrate quality. (15th June 2021)

• Record Type: Journal Article
• Authors: Chang, Ruixue; Guo, Qiuyue; Pandey, Pramod; Li, Yanming; Chen, Qing; Sun, Ying
• Is Part Of: Waste management. Volume 129(2021)
• Page Start: 47
• Page End: 53
• Publication Date: 2021-06-15
• Subjects: Pig manure biogas digestate (PMBD) -- Composting -- Seedling substrate -- Physicochemical character -- Bioassay; PMBD Pig manure biogas digestate -- CPMBD pig manure biogas digestate pretreated by composting -- PP1-PP3 PS1-PS3 and PM1-PM3 were treatments in which PMBD were mixed with different additives and mixing ratio for composting -- PP1-PP3 PMBD and perlite were mixed with ratio of 70:30, 60:40, and 50:50, respectively -- PS1-PS3 PMBD and sawdust were mixed with ratio of 85:15, 70:30, and 55:45, respectively -- PM1-PM3 PMBD, perlite and sawdust were mixed with ratio of 60:25:15, 60:20:20, and 60:15:25, respectively -- SDP1-SDP4 SCPP21-SCPP23, SCPS11-SCPS13 and SCPM11-SCPM13 were treatments in which PMBD/CPMBD were mixed with different additives and mixing ratio for seedling substrates -- SDP1-SDP4 PMBD was mixed with peat, vermiculite, and perlite with different ratios -- SCPP21-SCPP23 CPMBD (composted PMBD from composting treatment PP2) was mixed with peat, vermiculite, and perlite with different ratios -- SCPS11-SCPS13 CPMBD (composted PMBD from composting treatment PS1) was mixed with peat, vermiculite, and perlite with different ratios -- SCPM11-SCPM13 CPMBD (composted PMBD from composting treatment PM1) was mixed with peat, vermiculite, and perlite with different ratios; Hazardous wastes -- Periodicals; Refuse and refuse disposal -- Periodicals; 363.728
• DOI: 10.1016/j.wasman.2021.05.010
• Languages: English
• ISSNs: 0956-053X

Abstract

Highlights: Composting increased the proportion of pig manure digestate in seedling substrate. Composting stabilize the physiochemical properties of pig manure digestate. Perlite and sawdust improve the physiochemical properties of PMBD in composting. Both PMBD and CPMBD improved plant growth performance, especially CPMBD. Tomato was more sensitive than Lettuce to the seedling substrate properties. Abstract: 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.