Research Abstracts

Toilet flushing with wastewater was monitored in a tourist hotel. The wastewater was a mixture of a rejection flow from an osmosis unit for low quality water purification and treated greywater from bathrooms. Greywater treatment included chlorination with hypochlorite and sand filtration. The osmosi

The occurrence of arsenic in natural ground waters is due to geological composition of soil. There are several methods for removal of arsenic from drinking water, such as coagulation followed by filtration, membrane processes, ion exchange and adsorption. Adsorption methods proved to be effective, e

Humic acids are primarily a result of the microbiological degradation of surrounding vegetation and animal decay and enter surface waters through rain water run-off from the surrounding land. This often gives rise to large seasonal variations, high concentrations in the wet season and lower concentr

Ultrafiltration membranes are used extensively in dairy industry. The formation of fouling deposits during processing of dairy fluids has a significant impact on the performance of these membranes. In the current study, performance of a 30 kDa membrane has been investigated which is used to process

Bamboo, indigenous to Hong Kong and China, is widely used as scaffolding in construction and building projects. However, over 50,000 tonnes of bamboo scaffolding waste is disposed as landfill waste each year. Nevertheless, these wastes can be used as raw materials for the production of a range of hi

Recovery of nickel and cobalt from organic acid complexes generated by bioleaching of nickel laterite ores with heterotrophic organism and their metabolites were conducted by ion-exchange. This study investigated specifically the adsorption of nickel and cobalt complexed with citrate, malate and lac

Demand for lactic acid is growing, especially, for its use in the production of biodegradable polymer (polylactate). The current method of production and separation of lactic acid is both expensive and unsustainable. This is partly due to the cost and lower efficiency of the current method for separ

In this study, experiments were carried out to estimate sorptivity of chitosan beads and their selectivity towards Cu2+ (copper sulfate), Zn2+ (zinc sulfate) and Cr6+ (potassium dichromate) ions. Studies were performed in the concentration range from 20 to 500 mg/dm3 for single ions and their binary

Natural zeolites are good potential material for water and wastewater treatment. It is due to the advantages of low cost, ion-exchange and adsorption capability of the natural zeolites. It can also be modified and regenerated. This paper thus looks at efforts made in exploring the potential applicat

The objective of this study was to evaluate the effects of operating modes, membrane materials and pore size on natural organic matter (NOM) fouling. A range of flat sheet microfiltration (MF) and ultrafiltration (UF) membranes were tested under conditions of various constant pressure and constant f