LISi-min,LISi-yu,TANGFeng-bing,et al.Effect of Ventilation Rate on Nitrogen Transformation of Municipal Sludge in Aerobic Composting[J].China Water & Wastewater,2023,39(5):121-127.
Effect of Ventilation Rate on Nitrogen Transformation of Municipal Sludge in Aerobic Composting
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第39卷
Number:
第5期
Page:
121-127
Column:
Date of publication:
2023-03-01
- Abstract:
- The transformation of nitrogen in composting process has an important impact on the fertilizer efficiency of composting products. Municipal sludge and mushroom residue were mixed with the wet weight ratio of 1∶0.7 and then aerobic composted for 26 days. Three piles with different ventilation rates, namely pile A [2.4 m3/(m3·h)], pile B [2.9 m3/(m3·h)] and pile C [3.3 m3/(m3·h)], were set to investigate the effect of ventilation rate on the transformation of nitrogen-containing organic matter and NH3 volatilization during composting. After composting, the total nitrogen loss rate of the 3 piles (A, B and C) ranged from 16.90% to 25.10%, and the proportion of NH3 volatilization in total nitrogen loss ranged from 68.49% to 72.97%. In pile B, more NH4+-N was transformed into NO3--N, and the NO3--N of pile B was increased by 30.31% and 8.98% compared with that of pile A and pile C, respectively. The structural equation model showed that amine nitrogen (AN) was most easily transformed into NH4+-N under different ventilation rates. When the ventilation rate was 2.9 m3/(m3·h), the microorganism was more active, which promoted the accumulation of amino sugar nitrogen (ASN). In addition, NH4+-N was transformed into non-biodegradable hydrolysable unknown nitrogen (HUN), which increased the fixation of nitrogen. Considering both maturity conditions and nitrogen loss, the optimum ventilation rate was 2.9 m3/(m3·h).
Last Update:
2023-03-01