|Title:||Sodium dodecyl sulphate degradation by UV/H₂O₂for the post-treatment of anaerobic digestion|
|Subject:||Hong Kong Polytechnic University -- Dissertations|
Sewage -- Purification -- Anaerobic treatment.
|Department:||Faculty of Construction and Environment|
|Pages:||ix, 66 leaves : ill. (some col.) ; 30 cm.|
|Abstract:||Greywater is proposed for toile flushing in Hong Kong, which is an important method of reducing fresh water consumption. Although it is low contaminated, robust treatment of greywater is required to ensure the safety of its reuse, especially for those applications with the potential for human exposure. A combined system containing anaerobic fluidized bed membrane bioreactor (AFMBR) and UV/H₂O₂ process has the potential to satisfy the reuse standard. This study mainly focuses on the feasibility of using UV/H₂O₂ for the treatment of unbiodegradable compound, e.g. surfactant, in greywater after anaerobic digestion, since this kind of research is seldom to be done before. Sodium dodecyl sulphate has been decided to be the delegate of the unbiodegradable compound in greywater. Firstly, the optimum H₂O₂ dosage and pH was found out to be 20 mM and 3 respectively. Since more than 90% of SDS can be removal within 50 minutes using 10 mM H₂O₂ at initial pH 39, 10 mM H₂O₂ was decided to be used in the subsequent experiment in terms of economy. Regarding to the ions in the effluent from anaerobic digestion, e.g. aqueous ammonia, phosphate, bicarbonate/carbonate, sulphite and sulphate, except the bicarbonate/carbonate and sulphite which would cause significant rate retardation in SDS degradation, the other ions did not affect the treatment obviously. In practical application, the bicarbonate/carbonate species should be the major influence for UV/H₂O₂ process. The energy efficiency of differ power UVC lamps was compared by electric energy per order (EEO) (kWh m⁻³ order⁻¹), which indicates that the higher energy input, the lower energy efficiency. Besides, the energy efficiency of our experiment is much higher than some studies of advanced oxidation processes (AOPs) with an EEO of 2.1 kWh m⁻³ order⁻¹.|
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