Suchergebnisse

The Australian government has been promoting water conservation and recycling through active campaigns and through offering incentives/grants for water saving ideas/innovations. One of several water conserving techniques is on-site grey-water recycling for non-drinking purposes. However, there is a general reluctance to adopt on-site grey-water recycling measures. One of the reasons behind this reluctance is lack of awareness of the shortness of payback period for initial investment through potable water savings. In this study, the feasibility of grey-water recycling in multi-storey buildings in Melbourne was analysed and discussed. The study confirmed the significant potential for reducing the water demand and the benefits that the Melbourne population and water authorities can gain through adopting simple water conservation practices and greywater recycling in multi-story buildings. In such buildings, the available grey-water can significantly exceed the demand, which suggests that grey-water collection from some floors would be enough to meet the demand of all the floors in a building. The discussion was extended to proposing unique greywater recycling schemes for Melbourne, involving partial grey-water recycling from the higher floors of multi-storey buildings, and locating greywater treatment systems on the roofs of buildings. Finally, the effect of the number of floors on cost recovery periods was investigated, and the effect of using water conserving devices in combination with greywater recycling on cost recovery periods was assessed.

AbstractRecent textile industry expansion has a major environmental impact if not addressed. Being a water intensive industry, textile manufacturing is usually associated with wastewater management challenges. Electrocoagulation (EC) is recognized as one of the effective solutions to address these challenges. This study aims to investigate the potential of integrating seawater into the EC process for textile wastewater treatment, targeting optimal pollutant removal efficiencies. A simple electrolytic reactor was designed to investigate the removal efficiency of these treatments for chemical oxygen demand (COD), total suspended solids (TSS), turbidity, and color from textile wastewater at different seawater percentages and retention times. Notably, the addition of seawater not only improves the EC process efficiency but also significantly dilutes pollutants, reducing their concentrations. This dual effect enhances removal efficiency and dilution optimizes the treatment outcome. The highest removal efficiencies were achieved for COD (47.26%), TSS (99.52%), turbidity (99.30%), and color (98.19%). However, pH, dissolved oxygen (DO), and electrical conductivity increased with increasing retention times and seawater percentages in the EC process. Moreover, Seawater − EC integration reduces power usage to 15.769 Am−2 and costs approximately 0.20 USD/m3. To assess the effects of the retention times and seawater percentages on pollutant removal from textile wastewater, an analysis of variance (ANOVA) was conducted utilizing the Design-Expert 11 software. The best model obtained using Central Composite Design (CCD) was quadratic for COD (R2 = 0.9121), color (R2 = 0.9535), turbidity (R2 = 0.9525), and TSS (R2 = 0.9433). This study suggests that higher seawater percentages and longer retention times effectively eliminate contaminants but increase ion concentrations.