Abstract
In present study, the effects of carbon sources on compost process and quality were evaluated in the lab-scale sewage sludge (SS) composting. The composting experiments were performed for 32 days in 5 L reactors. The results showed that carbon sources could change the nitrogen conversion and improve the compost quality. Especially, the readily degradable carbon source could promote organic matter degradation, improve nitrogen conversion process and accelerate compost maturation. The addition of glucose and sucrose could increase dissolved organic carbon, CO2 emission, dehydrogenase activity, nitrification and germination index during the SS composting. That's because glucose and sucrose could be quickly used by microbes as energy and carbon source substance to increase activity of microbes and ammonia assimilation. What's more, the NH3 emission was reduced by 26.9% and 32.1% in glucose and sucrose treatments, respectively. Therefore, the addition of readily degradable carbon source could reduce NH3 emission and improve compost maturity in the SS composting.
Highlights
In present study, the effects of carbon sources on compost process and quality were evaluated in the lab-scale sewage sludge (SS) composting
The main objectives of present research were to evaluate the influence of different carbon sources on physical–chemical properties, organic matter degradation, dehydrogenase activity (DHA), N H3 emission, nitrification index and germination index in Sewage sludge (SS) composting
The organic matter (OM) degraded rapidly of all treatments during the thermophilic phase of composting, and the OM contents dropped to 45.8%, 44.8%, 47.1%, 49.2% and 51.3% respectively at the end of the thermophilic phase (Day 13)
Summary
The effects of carbon sources on compost process and quality were evaluated in the lab-scale sewage sludge (SS) composting. The readily degradable carbon source could promote organic matter degradation, improve nitrogen conversion process and accelerate compost maturation. The addition of glucose and sucrose could increase dissolved organic carbon, CO2 emission, dehydrogenase activity, nitrification and germination index during the SS composting. The addition of readily degradable carbon source could reduce NH3 emission and improve compost maturity in the SS composting. The main objectives of present research were to evaluate the influence of different carbon sources (glucose, sucrose, starch, and cellulose) on physical–chemical properties, organic matter degradation, dehydrogenase activity (DHA), N H3 emission, nitrification index and germination index in SS composting
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