TY  - JOUR
A1  - Mehling, Simon
A1  - Schnabel, Tobias
A1  - Londong, Jörg
T1  - Investigation on Energetic Efficiency of Reactor Systems for Oxidation of Micro-Pollutants by Immobilized Active Titanium Dioxide Photocatalysis
JF  - Water
N2  - In this work, the degradation performance for the photocatalytic oxidation of eight micropollutants (amisulpride, benzotriazole, candesartan, carbamazepine, diclofenac, gabapentin, methlybenzotriazole, and metoprolol) within real secondary effluent was investigated using three different reactor designs. For all reactor types, the influence of irradiation power on its reaction rate and energetic efficiency was investigated. Flat cell and batch reactor showed almost similar substance specific degradation behavior. Within the immersion rotary body reactor, benzotriazole and methylbenzotriazole showed a significantly lower degradation affinity. The flat cell reactor achieved the highest mean degradation rate, with half time values ranging from 5 to 64 min with a mean of 18 min, due to its high catalysts surface to hydraulic volume ratio. The EE/O values were calculated for all micro-pollutants as well as the mean degradation rate constant of each experimental step. The lowest substance specific energy per order (EE/O) values of 5 kWh/m3 were measured for benzotriazole within the batch reactor. The batch reactor also reached the lowest mean values (11.8–15.9 kWh/m3) followed by the flat cell reactor (21.0–37.0 kWh/m3) and immersion rotary body reactor (23.9–41.0 kWh/m3). Catalyst arrangement and irradiation power were identified as major influences on the energetic performance of the reactors. Low radiation intensities as well as the use of submerged catalyst arrangement allowed a reduction in energy demand by a factor of 3–4. A treatment according to existing treatment goals of wastewater treatment plants (80% total degradation) was achieved using the batch reactor with a calculated energy demand of 7000 Wh/m3.
KW  - Fotokatalyse
KW  - Abwasserreinigung
KW  - photocatalysis
KW  - micro-pollutant treatment
KW  - titanium dioxid
KW  - reactor design
KW  - energy per order
KW  - OA-Publikationsfonds2022
Y1  - 2022
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:gbv:wim2-20220912-47130
UR  - https://www.mdpi.com/2073-4441/14/17/2681
VL  - 2022
IS  - Volume 14, issue 7, article 2681
SP  - 1
EP  - 15
PB  - MDPI
CY  - Basel
ER  - 
TY  - JOUR
A1  - Aicher, Andreas
A1  - Börmel, Melanie
A1  - Londong, Jörg
A1  - Beier, Silvio
T1  - Vertical green system for gray water treatment: Analysis of the VertiKKA-module in a field test
JF  - Frontiers in Environmental Science
N2  - This work presents a modular Vertical Green System (VGS) for gray water treatment, developed at the Bauhaus-Universität Weimar. The concept was transformed into a field study with four modules built and tested with synthetic gray water. Each module set contains a small and larger module with the same treatment substrate and was fed hourly. A combination of lightweight structural material and biochar of agricultural residues and wood chips was used as the treatment substrate. In this article, we present the first 18 weeks of operation. Regarding the treatment efficiency, the parameters chemical oxygen demand (COD), total phosphorous (TP), ortho-phosphate (ortho-P), total bound nitrogen (TNb), ammonium nitrogen (NH4-N), and nitrate nitrogen (NO3-N) were analyzed and are presented in this work. The results of the modules with agricultural residues are promising. Up to 92% COD reduction is stated in the data. The phosphate and nitrogen fractions are reduced significantly in these modules. By contrast, the modules with wood chips reduce only 67% of the incoming COD and respectively less regarding phosphates and the nitrogen fraction.
KW  - Grauwasser
KW  - Abwassertechnologie
KW  - vertical green system
KW  - grey water treatment
KW  - urban heat island effect
KW  - OA-Publikationsfonds2022
Y1  - 2022
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:gbv:wim2-20230124-48840
UR  - https://www.frontiersin.org/articles/10.3389/fenvs.2022.976005/full
VL  - 2022
IS  - Volume 10 (2022), article 976005
SP  - 1
EP  - 7
PB  - Frontiers Media
CY  - Lausanne
ER  -