Utilizing dry type air scrubber in refuse collection points of Hong Kong

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Utilizing dry type air scrubber in refuse collection points of Hong Kong


Author: Lau, Siu-kei Dominic
Title: Utilizing dry type air scrubber in refuse collection points of Hong Kong
Degree: M.Sc.
Year: 2000
Subject: Odor control
Waste disposal sites -- Environmental aspects -- China -- Hong Kong
Hong Kong Polytechnic University -- Dissertations
Department: Multi-disciplinary Studies
Dept. of Building Services Engineering
Pages: ix, 118 leaves : ill. ; 30 cm
Language: English
InnoPac Record: http://library.polyu.edu.hk/record=b1504198
URI: http://theses.lib.polyu.edu.hk/handle/200/3654
Abstract: Dry type air scrubbers adopting the ionisation principle have been increasingly used as odour control equipment in the small refuse collection chambers of commercial organisations in Hong Kong. The advantages of compact equipment size, low initial and running costs, and exemption of Danger Good Store requirements have led the Architectural Services Department (ArchSD) have an initiative to conduct a feasibility study of utilising the dry air scrubber as a replacement of the commonly used wet scrubber in the refuse collection points (RCP) of Hong Kong. With the assistance of the Regional Services Department (RSD) and the supplier, a trial unit using the photo-oxidation principle was installed at Sai Kung RCP and tested in summer of 1999. A series of odour tests was carried out to evaluate the deodorising performance and the optimal residence time of photo-oxidation of the dry scrubbers. Air samples were collected and evaluated at the odour laboratory of the Hong Kong Polytechnic University by sensory analysis in accordance with the Dutch standard method NVN 2820 (1995) as well as the discussing version of the European standard CEN TC264 (1995). The results showed that both the dry and wet scrubbers performed similar odour control efficiency during the tests. Considerable efforts were also made to collect same air samples for instrumental analyses. The results indicated that hydrogen sulphide (H2S) could not be determined from the instrumental analysis. The concentration of H2S was determined to be below the detection limit (0.5ppm) in all cases. Only formaldehyde and ozone at non-hazardous levels were measured from the collected air samples. In order to obtain the overall picture on the performance of the dry scrubber, the life cycle costs of the dry and wet scrubbers and their installation constraints were also evaluated. The results showed that the dry scrubber has advantages on the exemption of both spatial and fire service requirements of danger good stores for storage of scrubbing chemicals, lower degree of noise problems and lower life cycle costs. Considering the problems of water pollution and potable water consumption of the wet scrubber, the dry scrubber may be one of the feasible solutions to odour control. It is suggested to install a full size (at ventilation rate of 30 air changes) dry scrubber in a new RCP as a pilot scheme for further testing. Moreover, a monitoring programme is recommended to record the replacement frequency of pre-filters, activated carbon filters and UV lamps.

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