Department of Chemical Engineering, Imperial College of Science and Technology and Medicine, London, UK.
J Environ Sci Health A Tox Hazard Subst Environ Eng. 2011;46(13):1539-48. doi: 10.1080/10934529.2011.609402.
In this study, various methods were compared to reduce the Chemical Oxygen Demand (COD) content of stabilised leachate from a Submerged Anaerobic Membrane Bioreactor (SAMBR). It was found that Powdered Activated Carbon (PAC) resulted in greater COD removals (84 %) than Granular Activated Carbon (GAC-80 %), an ultrafiltration membrane of 1kDa (75 %), coagulation-flocculation with FeCl(3) and polyelectrolyte (45 %), FeCl(3) alone (32 %), and polymeric adsorbents such as XAD7HP (46 %) and XAD4 (32 %). Results obtained on the <1 kDa fraction showed that PAC and GAC had a similar adsorption efficiency of about 60 % COD removal, followed by XAD7HP (48 %), XAD4 (27 %) and then FeCl(3) (23 %). The post-treatment sequence UF+GAC would result in a final effluent with less than 100 mg COD/L. Size Exclusion Chromatography (SEC) revealed that the extent of adsorption of low MW compounds onto PAC was limited due to low MW hydrophilic compounds, whereas the kinetics of PAC adsorption depended mainly on the adsorption of high MW aromatics.
本研究比较了各种方法来降低浸没式厌氧膜生物反应器（SAMBR）稳定化渗滤液的化学需氧量（COD）含量。结果表明，粉末活性炭（PAC）比颗粒活性炭（GAC-80%）、1kDa 超滤膜（75%）、FeCl3 和聚电解质的混凝-絮凝（45%）、FeCl3 单独使用（32%）以及高分子吸附剂 XAD7HP（46%）和 XAD4（32%）更能有效去除 COD（84%）。<1 kDa 级分的结果表明，PAC 和 GAC 的吸附效率相似，约可去除 60%的 COD，其次是 XAD7HP（48%）、XAD4（27%）和 FeCl3（23%）。后续的超滤+GAC 处理将使最终出水的 COD 低于 100mg/L。尺寸排阻色谱（SEC）表明，由于低分子量亲水性化合物的存在，PAC 对低分子量化合物的吸附程度有限，而 PAC 吸附的动力学主要取决于高分子芳烃的吸附。
