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首页> 外文期刊>Journal of water reuse and desalination >Fabrication and evaluation of an attapulgite membrane as the filter for recycling blowdown water from industrial boilers
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Fabrication and evaluation of an attapulgite membrane as the filter for recycling blowdown water from industrial boilers

机译：凹凸棒膜作为工业锅炉排污水循环过滤器的制备与评价

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摘要

Continuous blowdown water (CBW) from industrial boilers is of great quantity and energy, and therefore worth recycling. According to the data from a long period of monitoring, carbonate and sulfate were documented as the main contaminants in CBW. Herein, an attapulgite (ATP) membrane was prepared on a macroporous Al2O3 support through solid state sintering. The prepared membrane (attapulgite membrane (ATM)) was characterized by mercury porosimetry, scanning electron microscope, X-ray diffraction, and permselectivity analysis in dead-end mode. The optimal sintering temperature was 800 degrees C based on the morphology of the sintered active layer and its adhesive strength with support. The active layer exhibited a pore size distribution concentrated on 12.7 nm with a thickness of about 80 mu m. In addition, crystal structures of ATP were retained in powder form after sintering. ATM obtained a pure water permeability of 1,411.87 Lm(-2)h(-1)MPa(-1) with the effective retention of carbonate and sulfate through electrical-related interactions. Several ATM filters were also developed and mounted on the boiler blowdown pipe, which had a high rejection rate of alkalinity and dissolved solids in CBW. The volume of wastewater emitted from the low-pressure boiler was reduced, since the filtrate could be recycled as part of the make-up water.
机译：来自工业锅炉的连续排污水（CBW）的数量和能量很大，因此值得回收。根据长期监测的数据，碳酸盐和硫酸盐被记录为CBW中的主要污染物。在此，通过固态烧结在大孔Al 2 O 3载体上制备凹凸棒（ATP）膜。通过水银孔隙率法，扫描电子显微镜，X射线衍射和终端模式下的渗透选择性分析对制得的膜（凹凸棒膜（ATM））进行表征。基于烧结的活性层的形态及其与载体的粘合强度，最佳烧结温度为800℃。活性层的孔尺寸分布集中在12.7nm上，厚度约80μm。另外，在烧结后，ATP的晶体结构以粉末形式保留。 ATM获得了1,411.87 Lm（-2）h（-1）MPa（-1）的纯水渗透率，并通过电相关的相互作用有效保留了碳酸盐和硫酸盐。还开发了几种ATM过滤器并将其安装在锅炉排污管上，该过滤器具有较高的碱度和CBW中溶解固体的排除率。低压锅炉排放的废水量减少了，因为滤液可以作为补充水的一部分进行循环利用。

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