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You searched for +publisher:"University of Cambridge" +contributor:("Lynch, Rod J"). One record found.

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University of Cambridge

1. Lim, Leonard Lik Pueh. In-situ photocatalytic remediation of organic contaminants in groundwater .

Degree: 2010, University of Cambridge

This research is about the development of a photocatalytic reactor design, Honeycomb, for in-situ groundwater remediation. Photocatalysis, typically a pseudo first order advanced oxidation process, is initiated via the illumination of UVA light on the catalyst, i.e. titanium dioxide (TiO2). In the presence of oxygen, highly reactive oxidising agents are generated such as superoxide (O2-), hydroxyl (OH·-) radicals, and holes (hvb+) on the catalyst surface which can oxidise a wide range of organic compounds. The target contaminant is methyl tert butyl ether (MTBE), a popular gasoline additive in the past three decades, which gives the water an unpleasant taste and odour at 20 µg L-1, making it undrinkable. This research consists of three major parts, i.e. (i) establishing a suitable catalyst immobilisation procedure, (ii) characterisation and evaluation of reactor models and (iii) scale up studies in a sand tank. TiO2 does not attach well onto many surfaces. Therefore, the first step was to determine a suitable immobilisation procedure by preparing TiO2 films using several potential procedures and testing them under the same conditions, at small scale. The coatings were evaluated in terms of photocatalytic activity and adhesion. The photocatalytic activity of the coatings was tested using methylene blue dye (MB), which is a photocatalytic indicator. A hybrid coating, which comprises a sol gel solution enriched with Aeroxide TiO2 P25 powder, on woven fibreglass exhibited the best adhesion and photocatalytic activity among samples evaluated. Thus, it was used to produce immobilised catalyst for this research. Consequently, the immobilisation procedure was scaled up to synthesize TiO2 coatings for the potential photocatalytic reactor design. The photocatalytic activity of the coatings produced from the scaled up immobilisation procedure were reasonably comparable to that produced at small scale. Due to the UVA irradiation and mass transfer limitations, photocatalytic reactors are typically compact in order to maximise their efficiency to accommodate high flows, particularly in water and wastewater treatment. In the case of groundwater, however, the treatment area can span up to meters in width and depth. Groundwater flow is significantly lower than that of water treatment, as the reactor design does not need to be compact. Considering both factors, a photocatalytic reactor design of hexagonal cross-section (Honeycomb) was proposed, in which the structures can be arranged adjacent to each other forming a honeycomb. A model was constructed and tested in a 4 L column (cylindrical) reactor, using the MB test to characterise the reactor performance and operating conditions. This was followed by a hydraulic performance study, which encompasses single and double pass flow studies. The single pass flow study involves the photocatalytic oxidation (PCO) of MB and MTBE, while the double pass flow study was focused on the PCO of MTBE only. The double pass can simulate two serially connected reactors. Single pass flow studies found… Advisors/Committee Members: Lynch, Rod J (advisor).

Subjects/Keywords: Sand tank experiment; Cumulative performance; Petroleum hydrocarbons; Single pass flow experiment; Double pass flow experiment

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APA (6th Edition):

Lim, L. L. P. (2010). In-situ photocatalytic remediation of organic contaminants in groundwater . (Thesis). University of Cambridge. Retrieved from http://www.dspace.cam.ac.uk/handle/1810/238767

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

Lim, Leonard Lik Pueh. “In-situ photocatalytic remediation of organic contaminants in groundwater .” 2010. Thesis, University of Cambridge. Accessed February 17, 2019. http://www.dspace.cam.ac.uk/handle/1810/238767.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Lim, Leonard Lik Pueh. “In-situ photocatalytic remediation of organic contaminants in groundwater .” 2010. Web. 17 Feb 2019.

Vancouver:

Lim LLP. In-situ photocatalytic remediation of organic contaminants in groundwater . [Internet] [Thesis]. University of Cambridge; 2010. [cited 2019 Feb 17]. Available from: http://www.dspace.cam.ac.uk/handle/1810/238767.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Lim LLP. In-situ photocatalytic remediation of organic contaminants in groundwater . [Thesis]. University of Cambridge; 2010. Available from: http://www.dspace.cam.ac.uk/handle/1810/238767

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

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