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为验证超滤膜物理破损压力衰减监测的有效性,对破损后膜出水水质的变化和膜内压力的衰减情况进行系统考察.借助医用探针在超滤膜上制造破损点(单个扎孔破损率A=5.46×10-6),发现随着破损率由0增加到5A,超滤膜出水的UV254和DOC仅分别增加24%和26%;出水浊度由0.100 NTU增加到0.290 NTU,但绝对值依然很低,难以反映超滤膜破损的程度.超滤膜急性物理破损时,膜内压力则呈现出急剧下降的趋势,即便破损率仅为1A时,55 k Pa的压力仅66 s就降至零点.因此,以压力衰减监测作为超滤膜物理破损的一种快速、高效、灵敏的评价方法是行之有效的.接触实验表明,粉末炭与超滤膜的短期接触(45 d)不会造成超滤膜的慢性物理破损,不会影响出水水质.
In order to verify the effectiveness of monitoring the attenuation of the physical damage of the ultrafiltration membrane, the changes of the water quality of the membrane after the damage and the attenuation of the pressure in the membrane were systematically investigated. The medical probes were used to make the damage points on the ultrafiltration membrane Rate A = 5.46 × 10-6). It was found that the UV254 and DOC of the ultrafiltration membrane increased only by 24% and 26%, respectively, with the breakage rate increased from 0 to 5A. The effluent turbidity increased from 0.100 NTU to 0.290 NTU, The absolute value is still very low, it is difficult to reflect the extent of the ultrafiltration membrane damage.Under the acute physical damage of the ultrafiltration membrane, the pressure in the membrane shows a sharp downward trend, even if the damage rate is only 1A, the pressure of 55 k Pa is only 66 s So it is effective to use pressure decay monitoring as a fast, efficient and sensitive method to evaluate the physical damage of ultrafiltration membrane.Contact experiments show that the short-term contact between powder carbon and ultrafiltration membrane (45 d ) Will not cause chronic physical damage to the ultrafiltration membrane, will not affect the water quality.