Abstract
The generation and emission of ammonia (NH3) were studied using a continuous monitoring system in an established sewage sludge treatment plant. Results showed that NH3 generation within the pile differed from the emissions at the pile surface during composting. The maximum NH3 concentration reached 600 mg m−3 inside the composting pile and 200 mg m−3 in the outlet gas. The mass of N determined in NH3 generations was 9.97 g kg DM−1, which was 2.57 times higher than the mass of N in NH3 emissions. The highest NH3 generation and emission masses in one aeration cycle occurred during the mesophilic (10.19 mg kg−1) and early thermophilic (6.91 mg kg−1) phases. The relationship between NH3 generation rates and time during one aeration cycle and different composting phases could be expressed as a logarithmic equation, and the relationship between NH3 emission rate and time could be expressed as a quadratic equation.
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