Industrial Wastewater Reuse Technologies
Presentation Outline
Technologies which can be applied to wastewater reuse.
Understand how the wastewater is to be reused.
The source and characteristics of the wastewater to be reused
Alternatives sources for wastewater which can be reused.
Common reuse application and technologies.
Reusing wastewater does not mean the waste “Goes Away”.
Understanding the limitations of reuse technologies.
Piloting and bench scale studies.
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Guidelines For Drinking-Water Quality Management For New Zealand Chapter 19: Small, Individual And Roof Water Supplies
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Providing safe drinking-water for all is a cornerstone of protecting people from illness, and it is the responsibility of the water supplier/operator to ensure that the drinking-water they provide is safe regardless of the number of people served and the type of population. In 2002 the New Zealand Water and Wastes Association (NZWWA) in conjunction with the New Zealand Water Environment Research Foundation (NZWERF) conducted a survey of New Zealand small water systems (systems that supply water to fewer than 500 people). The survey attempted to identify how well the systems were being managed, and what difficulties the industry experienced in meeting the requirements as set out in the Drinking-water Standards for New Zealand 2000 (DWSNZ). The objective of the report was to highlight the trends and issues facing small water systems. The interviewers undertook a visual inspection of the systems and rated the plant in the majority of systems (85 percent) as in excellent or satisfactory condition; although ‘satisfactory’ does not mean that they were DWSNZ compliant. The 15 percent of the systems that were rated as unsatisfactory were given this rating mainly for having no (or an inadequate level) of treatment. Only 40 percent of surface water sources were reported to be fenced, at least 20 percent of the groundwater sources had insecure head works, and 47 percent of roof water sources had no flushing points. The storage tanks for 33 percent of the systems were considered to have inadequate vermin protection or were incorrectly sealed, NZWWA (2002).
Guidelines For Drinking-Water Quality Management For New Zealand Chapter 19: Small, Individual And Roof Water Supplies
Introduction
Providing safe drinking-water for all is a cornerstone of protecting people from illness, and it is the responsibility of the water supplier/operator to ensure that the drinking-water they provide is safe regardless of the number of people served and the type of population. In 2002 the New Zealand Water and Wastes Association (NZWWA) in conjunction with the New Zealand Water Environment Research Foundation (NZWERF) conducted a survey of New Zealand small water systems (systems that supply water to fewer than 500 people). The survey attempted to identify how well the systems were being managed, and what difficulties the industry experienced in meeting the requirements as set out in the Drinking-water Standards for New Zealand 2000 (DWSNZ). The objective of the report was to highlight the trends and issues facing small water systems. The interviewers undertook a visual inspection of the systems and rated the plant in the majority of systems (85 percent) as in excellent or satisfactory condition; although ‘satisfactory’ does not mean that they were DWSNZ compliant. The 15 percent of the systems that were rated as unsatisfactory were given this rating mainly for having no (or an inadequate level) of treatment. Only 40 percent of surface water sources were reported to be fenced, at least 20 percent of the groundwater sources had insecure head works, and 47 percent of roof water sources had no flushing points. The storage tanks for 33 percent of the systems were considered to have inadequate vermin protection or were incorrectly sealed, NZWWA (2002).
A Handbook for Integrated Water Resources Management in Basins
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A Handbook for Integrated Water Resources Management in Basins
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Nanofiltration and Reverse Osmosis Applied to Gold Mining Effluent Treatment and Reuse
Abstract:
Gold mining and ore processing are activities of great economic importance. However, they are related to generation of extremely polluted effluents containing high concentrations of heavy metals and low pH. This study aims to evaluate the optimal conditions for gold mining effluent treatment by crossflow membrane filtration regarding the following variables: nanofiltration (NF) and reverse osmosis (RO) membrane types, feed pH and permeate recovery rate. It was observed that retention efficiencies of NF90 were similar to those of RO membranes though permeate fluxes obtained were 7-fold higher. The optimum pH value was found to be 5.0, which resulted in higher permeate flux and lower fouling formation. At a recovery rate above 40% there was a significant decrease in permeate quality, so this was chosen as the maximum recovery rate for the proposed system. We conclude that NF is a suitable treatment for gold mining effluent at an estimated cost of US$ 0.83/m³.
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Nanofiltration and Reverse Osmosis Applied to Gold Mining Effluent Treatment and Reuse
Abstract:
Gold mining and ore processing are activities of great economic importance. However, they are related to generation of extremely polluted effluents containing high concentrations of heavy metals and low pH. This study aims to evaluate the optimal conditions for gold mining effluent treatment by crossflow membrane filtration regarding the following variables: nanofiltration (NF) and reverse osmosis (RO) membrane types, feed pH and permeate recovery rate. It was observed that retention efficiencies of NF90 were similar to those of RO membranes though permeate fluxes obtained were 7-fold higher. The optimum pH value was found to be 5.0, which resulted in higher permeate flux and lower fouling formation. At a recovery rate above 40% there was a significant decrease in permeate quality, so this was chosen as the maximum recovery rate for the proposed system. We conclude that NF is a suitable treatment for gold mining effluent at an estimated cost of US$ 0.83/m³.
Keywords: Gold mining effluent treatment; Nanofiltration (NF); Reverse Osmosis (RO); Feed pH; Permeate recovery rate.
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