Effect of bituminous coal mixing on the electro-dewatering performance of sludge
To promote the process of resource utilization of sludge incineration,this article used bituminous coal to mix activated sludge,and then the electro-dewatering performance of the mixed sludge was studied.The variations of physical and chemical properties,organic properties,and low calorific value of mixed sludge during the electro-dewatering process were examined.The results showed that the dewatering content of sludge first increased and then decreased with the increase in bituminous coal dosage.When the optimal coal dosage was 50％DS,the moisture content of the mixed sludge decreased from 81％±0.8％to 50.1％±0.6％,and the dewatering time was shortened by 30.8％compared to no-mixed sludge.Mixing bituminous coal could improve the conductivity and Ohmic heating effect of sludge,thereby improving the dewatering efficiency.The moisture content of sludge was highly correlated with the content of hydrophilic amino acids such as threonine,serine,histidine,glutamic acid,and hydrophobic amino acids such as valine(|r|＞0.883,p＜0.05).Electro-dewatering after mixing bituminous coal could reduce the content of hydrophilic amino acids and oxygen-containing functional groups in the sludge cake,improving the hydrophobicity of the sludge.After the electro-dewatering of mixed sludge,the low calorific value of sludge cake was increased by more than 60％compared to the no-mixed electro-dewatering treatment.This result was helpful for the subsequent resource utilization of mixed combustion of sludge and coal.
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