Dialynas Emmanuel, Mantzavinos Dionissios, Diamadopoulos Evan
Department of Environmental Engineering, Technical University of Crete, University Campus, Chania, Greece.
Water Res. 2008 Nov;42(18):4603-8. doi: 10.1016/j.watres.2008.08.008. Epub 2008 Aug 14.
The work investigated the treatment of the concentrate produced from the reverse osmosis treatment of an MBR effluent. Two conventional chemical processes, coagulation and activated carbon adsorption, and three advanced oxidation processes (electrochemical treatment, photocatalysis and sonolysis) were applied. Coagulation with alum gave dissolved organic carbon (DOC) removals up to 42%, while FeCl(3) achieved higher removals (52%) at lower molar doses. Adsorption with granular activated carbon showed the highest DOC removals up to 91.3% for 5 g/L. The adsorption isotherm was linear with a non-adsorbable organic fraction of around 1.2 mg/L DOC. The three oxidation methods employed, electrolytic oxidation over a boron-doped diamond electrode, UVA/TiO2 photocatalysis and sonolysis at 80 kHz, showed similar behavior: during the first few minutes of treatment there was a moderate removal of DOC followed by further oxidation at a very slow rate. Electrolytic oxidation was capable of removing up to 36% at 17.8A after 30 min of treatment, sonolysis removed up to 34% at 135W after 60 min, while photocatalysis was capable of removing up to 50% at 60 min.
该研究工作考察了对膜生物反应器（MBR）出水进行反渗透处理后产生的浓缩液的处理方法。采用了两种传统化学工艺，即混凝和活性炭吸附，以及三种高级氧化工艺（电化学处理、光催化和超声分解）。用明矾进行混凝时，溶解性有机碳（DOC）去除率高达42%，而在较低摩尔剂量下，FeCl₃的去除率更高（52%）。用颗粒活性炭吸附时，对于5 g/L的情况，DOC去除率最高可达91.3%。吸附等温线呈线性，不可吸附的有机部分约为1.2 mg/L DOC。所采用的三种氧化方法，即硼掺杂金刚石电极上的电解氧化、UVA/TiO₂光催化和80 kHz的超声分解，表现出相似的行为：在处理的最初几分钟内，DOC有适度去除，随后以非常缓慢的速率进一步氧化。电解氧化在处理30分钟后，在17.8A电流下能够去除高达36%的DOC，超声分解在60分钟后，在135W功率下能够去除高达34%的DOC，而光催化在60分钟后能够去除高达50%的DOC。
