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造纸污泥的电渗透脱水效果

Keywords: 造纸污泥,电渗透,脱水

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Abstract:

采用电渗透脱水技术对经过带式压滤后的制浆造纸混合污泥进行深度脱水,考察了机械压力、电压梯度和污泥厚度对污泥电渗透脱水效果与能耗的影响。结果表明,机械压力从25kPa升至76kPa时,脱水效果也会随之提高,但是继续增大机械压力对脱水效果的提高作用就会变得不明显;随着电压梯度的增加,脱水效果会有明显的升高,但是能耗也会相应地增加;电压梯度恒定为30V/cm且污泥厚度从0.35cm增加到1.40cm时,脱水效果和能耗都会相应地增加。对于所有的电脱水实验,当污泥的含水率从74.85%降至60%时所需要的能耗均在0.14~0.28kWh/kg去除水之间。综合考虑脱水效果和能耗,可认为最优脱水条件是:机械压力为76kPa,电压梯度为30V/cm,污泥厚度为0.7cm。

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