Study on the reduction of polycyclic aromatic hydrocarbon risks during thermal desorption of dewatered concentrated sludge
Dewatered concentrated sludge was conducted to analyze the component and ecological risk changes of 16 polycyclic aromatic hydrocarbons(PAHs)in sludge before and after thermal desorption,and explore the factors influencing the reduction using methods such as risk entropy.Results showed that with the increase of thermal desorption temperature,the particle size of sludge initially increased and then decreased.After thermal stabilization treatment of 45 min under 200,300,400 and 500 ℃,the thermal desorption efficiencies of PAHs in sludge were 81.67％,99.32％,99.55％and 99.53％respectively.Under 300 ℃,after 15,30 and 45 min of thermal stabilization treatment,the thermal desorption efficiencies of PAHs were 91.09％,97.00％and 99.32％,respectively.Most PAHs components could be risk-free after 45 min of thermal desorption stabilization at 300-500 ℃.As a result,PAHs in sludge could be effectively degraded and its ecological risk reduced by controlling the temperature and duration of thermal desorption process.
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