Informations et ressources scientifiques
sur le développement des zones arides et semi-arides

Accueil du site → Doctorat → Australie → On site remediation of micropollutants from stormwater for reuse

University of Technology Sydney (UTS) 2012

On site remediation of micropollutants from stormwater for reuse

Mohammed, TMA

Titre : On site remediation of micropollutants from stormwater for reuse

Auteur : Mohammed, TMA

Université de soutenance : University of Technology Sydney (UTS)

Grade : Philosophy of Doctorate of Engineering 2012

Résumé partiel
Water scarcity due to persistent drought is forcing the countries around the world to explore alternative fresh water resources. Australia is the driest inhabited continent, and has one of the most variable rainfall intensities in the world. In the last one hundred years Australia has suffered six major droughts and fifteen less severe droughts. The drought that commenced in 2001 has encouraged the harvesting of stormwater and re-use of water in order to lower the demand placed on municipal water supplies. Urban and industrial stormwater runoff has high potential as a reusable water resource, although it requires treatment due to the presence of several types of contaminants including inorganic ones that have adverse ecological impacts on receiving waters. The main aim of this research was to focus on the identification of contaminants of concern in Australian stormwater and provide suitable remediation solutions with effective onsite treatment practices such as biofiltration and adsorption/ ion exchange column techniques. Long term biofilter experiments were conducted with raw stormwater collected from a canal at Carlton, in Sydney. Anthracite and granular activated carbon (GAC) were used as a single filter media in biofilter columns. Media heights of 75 and 40 cm were used. The filter columns were operated at filtration velocities of 0.12 and 0.25 m/h. The removal efficiency for turbidity and DOC for the GAC filter media were found to be 75% and almost 100% respectively. The removal efficiency for the anthracite filter was much lower. Molecular weight distribution analysis showed an almost similar trend to the DOC removal. When compared to the anthracite filter media, the GAC biofilter removed a much larger range of organic compounds present in the stormwater. The GAC biofilter removed organic matter earlier as compared to the anthracite filter. Based on a limited sample of stormwater, the removal efficiency for phosphorus was upto 74% and that of nitrogen was up to 30%. In general, the GAC filter showed higher heavy metal removal efficiency than the anthracite filter. The removal of zinc, iron, lead and nickel were good, however, the concentration of heavy metals in the raw surface water sample was low. In another study, Organic matter removal from a diluted synthetic landfill leachate was studied using a GAC biofilter. This filter with a depth of 35cm was found to remove a significant amount of organic matter from the diluted synthetic landfill leachate. The experiments were conducted at low (0.2 m/h) and high (2 m/h) flow velocity through the GAC filter to represent insitu and exsitu biofiltration. The results showed that organic matter can be removed in a consistent manner for a long period of time. GAC bio-filtration led to a consistent TOC removal even after a long period of operation without the need to regenerate the activated carbon. Even after 30-50 days of continuous running, the organic removal efficiency from the GAC bio-filter was approximately 40% and 60% when high (2 m/hr) and low (0.2 m/hr) filtration velocities were used.

Présentation

Version intégrale (4,44 Mb)

Page publiée le 20 juillet 2017