磁场处理对市政污泥脱水性能的影响

为研究磁场对市政污泥脱水性能的影响,通过自主研制的磁场装置,开展了4种不同含水率(99.15%、97.41%、95.52%和93.73%)的市政污泥的磁场处理实验。实验结果表明:市政污泥经过磁场处理后脱水性能显著改善;高含水率下的污泥在磁场作用下脱水性能改善效果比低含水率好,在4种含水率下市政污泥的毛细吸水时间最大依次降低了90.5%、65.8%、61.6%和51.6%;通过实验数据优化分别得出4种含水率下污泥的最佳磁场处理强度和最佳磁场作用时间,且磁场强度、磁场作用时间与市政污泥含水率均呈二次多项式的关系;磁场处理对污泥离心脱水有影响,市政污泥经过磁场处理比未经过磁场处理的离心脱水含水率降低了约0.6%;建议在市政污泥脱水工艺中可考虑磁场与其他预处理工艺联合处理的方法以前达到更好的脱水效果。

Effect of magnetic field treatment on municipal sludge dewaterability

In order to study the effect of a magnetic field on the dewaterability of municipal sludge, magnetic treatment tests were conducted on sludge with four different moisture contents (99.15%, 97.41%, 95.52%, 93.73%) through an independently developed magnetic field device. The test results showed that the dewaterability of municipal sludge following magnetic treatment could be significantly improved. The maximum improvement of the capillary suction time of the sludge at different moisture contents were 90.5%, 65.8%, 61.6% and 51.6%, respectively, which indicated that the higher the moisture content, the greater the improvement in dewaterability. The optimal magnetic field intensity and magnetization time of municipal sludge were determined by the experimental data. In addition, the relationship between the best magnetic field intensity, magnetization time, and moisture content of the municipal sludge were quadratic polynomial functions. The centrifugation moisture content of the sludge post-magnetic treatment was reduced by about 0.6% as compared to the sludge without magnetic treatment. It is suggested that magnetic treatment combined with other pretreatment methods can be used to achieve better dewaterability of municipal sludge.