盐离子的使用对工业污泥消化率和脱水性能的影响研究

Study on the effect of salt ion use on the digestibility and dewatering performance of industrial sludge

本研究以某工业污泥为样品,在实验室规模的实验中研究了化学除磷(CPR)对污泥消化率和脱水性能的影响。消化率实验结果表明,在0.1g·L^(-1)剂量的Al^(3+)和Fe^(3+)盐下,剩余活性污泥厌氧消化产生的沼气体积分别减少了21%和36%。这表明,与Fe^(3+)盐相比,Al^(3+)盐对污泥厌氧消化过程中沼气产生的减少作用较小。另外,当金属盐剂量为50mg·L^(-1)时,Al^(3+)和Fe^(3+)分别使一级污泥的脱水率提高了16%和25%,剩余活性污泥的脱水率分别降低了73%和64%。表明在CPR过程中的预沉淀过程中,磷在主槽中被去除,从而提高污泥的脱水能力。

In this study,the effects of chemical phosphorus removal(CPR)on the digestibility and dewatering performance of an industrial sludge were studied in a laboratory scale experiment.The results of digestibility test showed that the volume of biogas produced by anaerobic digestion of residual activated sludge was reduced by 21% and 36%,respectively,at 0.1g·L^(-1) dose of Al^(3+)and Fe3+salt.This indicates that Al^(3+)salt has less effect on the reduction of biogas production during sludge anaerobic digestion than Fe^(3+)salt.The experimental results showed that when the metal salt dosage was 50mg·L^(-1),the dewatering rate of primary sludge was increased by 16% and 25% by Al^(3+)and Fe^(3+),and the dewatering rate of residual activated sludge was decreased by 73% and 64%,respectively.Thus,phosphorus was removed in the main tank during the pre-sedimentation process in the CPR,as a result,the dewatering capacity of the sludge would be increased.