膜法节能处理碱性过氧化机械制浆废水的可行性研究

Z. Yong, Cao Chun-yu, Feng Wenying, Lv Weijun
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引用次数: 1

摘要

通过前期研究,认为聚醚砜(PES)平板膜超滤适用于碱性过氧化物机械制浆(APMP)厂出水浓缩工艺。所以我们把浓缩实验扩大到中试规模。具体来说,为了获得更高的流量和更低的系统能耗,对横流速度和体积减小系数进行了再次优化。建立了数学模型,得到了最优参数。并对节能节水效果进行了评价。得到的最佳超滤条件为:截留分子量10000道尔顿,跨膜压力3 bar,进料温度50℃,横流速度2 m/s,体积缩小系数0.9。在此条件下,平均渗透通量为43.21 l/m2.h。总固形物含量由饲料中的25.47 g/l提高到精矿中的128.36 g/l。该渗透液总固体含量为11.03g/l,化学需氧量为9180 mg/l,生化需氧量为5870 mg/l。这些特性将允许渗透物在经过轻度生化处理后在APMP工艺中重复使用。采用该浓缩工艺,每生产一吨纸浆可节约能源6201.7 kWh,减少废水排放22.5 m3。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Feasibility of an Energy Saving Membrane Process for the Treatment of Alkaline Peroxide Mechanical Pulping Plants' Effluent
According to our previous study, it is believed that ultra-filtration with polyether sulfone (PES) flat-sheet membrane is suitable for the concentration process of alkaline peroxide mechanical pulping (APMP) plant¡¯s effluent. So we scaled up the concentrating experiment to a pilot-scale. Specifically, the cross flow velocity and volume reduction factor were optimized again for a higher flux and a lower system energy consumption. A mathematical model was established to obtain the optimal parameters. An estimation of energy and water saving effect were also developed. The optimal ultra filtration conditions obtained were: molecular weight cut-off at 10,000 Dalton, trans-membrane pressure at 3 bar, feed temperature at 50¡æ, cross-flow velocity at2 m/s, and volume reduction factor at 0.9. The average permeate flux under these conditions was 43.21 l/m2.h. The total solids content was increased from 25.47 g/l in the feed to 128.36 g/l in the concentrate. The permeate had low total solids content of 11.03g/l, Chemical Oxygen Demand of 9180 mg/l, and Biochemical Oxygen Demand of 5870 mg/l. Such qualities would allow the permeate to be reused in the APMP process after lightly biochemical treatment. With this new concentration process, about6201.7 kWh energy can be saved and 22.5 m3 effluent discharge can be reduced for each ton of pulp produced.
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