Removal of pharmaceutical and personal care products using a novel UV/TCNSP composite process in water.
Doctoral thesis, UCL (University College London).
Pharmaceutical and personal care products (PPCPs) are emerging pollutants because they might cause adverse effects in aquatic ecosystems and humans since they are polar, refractory and persistent chemicals. PPCPs are detected in aquatic environment at low concentration after secondary wastewater treatment processes (WWTPs), indicating that the conventional WWTPs are ineffective in removing PPCPs. Therefore an innovative treatment technology is required for effective treatment. Titanium dioxide (TiO2) is one of the most appropriate treatments to remove PPCPs. However the low adsorption and initial efficiency of TiO2 limit the removal rate of PPCPs. Moreover, TiO2 treatment required additional separation process for powdery TiO2 photocatalyst and recycling process of the treated water. In order to overcome identified limitations, TiO2 has been synthesized with various types of absorbents. Coconut shell powder which can act as a support of TiO2 was used as absorbent precursor in this thesis. This thesis begins with a methodology for preparing novel TiO2 with CocoNut Shell Powder (TCNSP) composite by the semi-AMPL process to produce granulation. The proposed methodology provides novel TCNSP composite with great crush strength and produces a sufficient mass quantity for commercialization. Crystallinity, morphology, crush strength and BET specific surface area of the novel TCNSP composite are controlled by the mixing ratio of TiO2 sol and coconut shell powder loading amount. It also presents the study of removal efficiency on three selected PPCP using TCNSP composite. The kinetic parameters for each target compounds-TCNSP composite pair were determined using the fixed bed reactor coupled with circulative flow mode approach based on the Langmuir-Hinshelwood model. Kinetic parameters were used as input for modeling using Response Surface Method (RSM) design called Central Composite design (CCD). Finally the performances of TCNSP composite for mineralization, comparison, and recycling test were evaluated with four different types of media. Results showed that TCNSP composite had around 99% of removal efficiency, whereas, commercial TiO2 beads, pure TiO2 pellets and CNSP pellets showed around Results showed that TCNSP composite had around 99% of removal efficiency, whereas, commercial TiO2 beads, pure TiO2 pellets and CNSP pellets showed around 30% of removal efficiency of carbamazepine at 60min reaction time. For industrial practice, electrical energy consumption was also calculated. The novel TCNSP composite can be valuable for the treatment of PPCPs wastewater and the reuse of treated water.
|Title:||Removal of pharmaceutical and personal care products using a novel UV/TCNSP composite process in water|
|UCL classification:||UCL > School of BEAMS > Faculty of Engineering Science > Civil, Environmental and Geomatic Engineering|
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