کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4484080 1316909 2011 12 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Efficiency and energy requirements for the transformation of organic micropollutants by ozone, O3/H2O2 and UV/H2O2
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات فرآیندهای سطح زمین
پیش نمایش صفحه اول مقاله
Efficiency and energy requirements for the transformation of organic micropollutants by ozone, O3/H2O2 and UV/H2O2
چکیده انگلیسی

The energy consumptions of conventional ozonation and the AOPs O3/H2O2 and UV/H2O2 for transformation of organic micropollutants, namely atrazine (ATR), sulfamethoxazole (SMX) and N-nitrosodimethylamine (NDMA) were compared. Three lake waters and a wastewater were assessed. With p-chlorobenzoic acid (pCBA) as a hydroxyl radical (
• OH) probe compound, we experimentally determined the rate constants of organic matter of the selected waters for their reaction with
• OH (kOH,DOM), which varied from 2.0 × 104 to 3.5 × 104 L mgC−1 s−1. Based on these data we calculated
• OH scavenging rates of the various water matrices, which were in the range 6.1–20 × 104 s−1. The varying scavenging rates influenced the required oxidant dose for the same degree of micropollutant transformation. In ozonation, for 90% pCBA transformation in the water with the lowest scavenging rate (lake Zürich water) the required O3 dose was roughly 2.3 mg/L, and in the water with the highest scavenging rate (Dübendorf wastewater) it was 13.2 mg/L, corresponding to an energy consumption of 0.035 and 0.2 kWh/m3, respectively. The use of O3/H2O2 increased the rate of micropollutant transformation and reduced bromate formation by 70%, but the H2O2 production increased the energy requirements by 20–25%. UV/H2O2 efficiently oxidized all examined micropollutants but energy requirements were substantially higher (For 90% pCBA conversion in lake Zürich water, 0.17–0.75 kWh/m3 were required, depending on the optical path length). Energy requirements between ozonation and UV/H2O2 were similar only in the case of NDMA, a compound that reacts slowly with ozone and
• OH but is transformed efficiently by direct photolysis.


► Energy requirements for micropollutant transformation by O3 and AOPs were determined.
► Scavenging rate of water and type of micropollutant determine the energy requirements.
► Ozonation: Typical energy consumption for 90% pollutant removal: 0.003–0.3 kWh/m3.
► O3/H2O2 requires 20–25% more energy than O3 for the same degree of transformation.
► UV/H2O2: Typical energy consumption for 90% pollutant transformation: 0.1–1 kWh/m3.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Water Research - Volume 45, Issue 13, July 2011, Pages 3811–3822
نویسندگان
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