Post-filtration compressibility characteristics of peat used as greywater filter media

Chan, Chee-Ming and Radin Mohamed, Radin Maya Saphira (2013) Post-filtration compressibility characteristics of peat used as greywater filter media. Middle-East Journal of Scientific Research, 17 (5). pp. 647-654. ISSN 1990-9233

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Abstract

Greywater produced daily in households is generally discharged to public waterways without prior treatment. As the health risks posed by the water are considered low, its disposal and possible negative impact on natural water bodies are not regulated. In a typical Malaysian household, used water from the laundry, bathroom and kitchen contribute to the total greywater discharge. The paper describes a laboratory-based examination of peat as a potentially cheap and effective filter media for household greywater. The greywater was prepared with controlled measures of common contaminants to represent the types of household greywater commonly produced. The filtered water quality was monitored over a month to gauge the effectiveness of the peat kilter media. The peat, upon filtration of the different greywater after 28 days, was subjected to the oedometer test to examine its 1-dimensional compressibility characteristics in relation with the filtration process. The findings indicated that the peat media could be beneficial in the removal of suspended solids and lowering of BOD (Eiiological Oxygen Demand) and COD (Chemical Oxygen Demand) of the greywater, though laundry greywater showed some worrying signs of excessive residual chemicals left in the discharge. The compressibility test data showed bahaviour commonly observed in soft materials like peat, with an apparent reduction of settlement post-filtration of the greywater. The reduction of void ratio (e) and water content (w), pre- and post-tests was found to be following a linear pattern, while the bulk density (p) showed less compatibility, especially of the mixed greywater water sample. The compression and swelling indices (C, and CJ were shown to be related with a power law equation. Overall, the compressibility of peat improved post-filtration with lower void ratio and water content. It is postulated that the impurities and chemicals entrapped in the peat media contributed to the enhanced stiffness.

Item Type:Article
Uncontrolled Keywords:peat; greywater; filter; compressibility; oedometer
Subjects:T Technology > TD Environmental technology. Sanitary engineering > TD201-500 Water supply for domestic and industrial purposes
Divisions:Faculty of Engineering Technology > Department of Civil Engineering Technology
ID Code:5274
Deposited By:Normajihan Abd. Rahman
Deposited On:01 Jun 2014 11:48
Last Modified:01 Jun 2014 11:48

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