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- Our Technology
Current page is 4.1: Current Operations
- 4.2: Acid mine drainage
- 4.3: Advanced water treatment
- 4.4: Aquaculture Pond maintenance
- 4.5: Correcting acidity levels
- 4.6: Drinking water solutions
- 4.7: Irrigation solutions
- 4.8: Mitigation & prevention of scale & corrosion
- 4.9: Mobile water treatment
- 4.10: Water Scarcity relief and recovery
- 4.11: Water Softening solutions
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| ADVANCED WATER SERVICES News And Updates |
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12/12/08
Category: Products
Posted by: admin
Alia Water Pty Ltd has released its new range of single-phase powered Drinking Water plants.
The three new models utilising our patented Rapid Catalytic Oxidation process with outputs of 20, 33 and 50 litres per minute will provide low cost groundwater treatment to the highest drinking water standards. Heavy metals removal, pH correction and colour and taste correction in a small, lightweight, portable skid-mounted unit. NEWS- the new model Version 7 Drinking Water Plant shipping to Thailand for Thai Government evaluation. see photos Product Range-Drinking Water Plants |
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CASE STUDIES
Testing Alia Water Pty Ltd Treatment Module using the PDV6000+ Portable Heavy Metal AnalyserCASE 1: LEEDERVILLE SITE (16.05.2008)
Background - Carr Street, new development requiring deep excavation for underground car park, which means that de-watering is necessary.
Issue - Underground water has high Fe and Mn levels and it is also very muddy. The DEC does not allow dumping of such water into stormwater drains, so it had to be treated.
Solution - Alia Water 'Metal Removal Module' was employed by Alia Water to treat the water.
Treatment - Water was pumped out using vacuum technology where after treatment and receiving approval from the DEC, was pumped into the storm water drain adjacent to the site.
Result - The extracted water was tested before and after treatment for Fe and Mn using the Hach Dr/890 portable calorimeter and the following results were recorded:
(Please note that there was no analysis done using PDV6000+ at this site. Results were obtained using the Dr/890 Hach calorimeter)
CASE 2: PERTH ARENA SITE (22.05.2008)
Background - Next to the old Entertainment Centre, Wellington Street, Perth, where a deep excavation is being carried out to build a new 14,000 seat Stadium.
Issue - This site has old peat deposits which have caused the groundwater to become very acidic. Total acidity as CaCO3, of the groundwater was measured by ALS Laboratories on the 27th October 2007 to be 82ppm. Other relevant parameters of this groundwater are:
Due to the hight total acidity of the water DEC required pumped water to be corrected for pH prior to recharging into the storm water system or recharging into the shallow aquifer.
Solution - Alia Water 'pH Correction Module' was employed by Alia Water Pty Ltd to treat the water.
Treatment (pH and metal removal) - Water was pumped out and then it underwent pH treatment to adjust the pH. It was then pumped into three settling ponds to allow iron to precipitate out before the water was used to recharge the groundwater once approval from DEC was given.
Results - Raw (no treatment) and treated (pH correction and metal removal) water samples were analysed onsite for Fe using a Dr/890 Hach Calorimeter instrument and for Arsenic using PDV6000+ instrument. Raw and treated samples were collected again on the 23rd May 08 and analysed in the lab using PDV6000+ for Cu and Pb on the 27th May and 30th May 08.
** Raw samples (no treatment) were collected on 22nd and 23rd May 08 and taken to the lab for second analysis. The samples were not acidified on the day of collection but a few days later on 27th May. This caused the iron to precipitate out of solution together with arsenic. Even after acidification (added 7.5ml of 1M HNO3 to 500ml of sample) raw samples were analysed on 27th and 30th May 08 and it was not possible to detect any arsenic, thus raw sample result for As was the sample analysed onsite on 22nd May08. However, it was possible to analyse those raw samples for copper since copper didn't precipitate out.
Summary - Preliminary investigation (using PDV6000+ instrument) of the raw and treated water (using pH and metal removal technology from Alia Water) results indicate that this technology successfully removed arsenic to less than 1ppb (limit of detection ICP-MS), copper and lead to less than 0.1ppb (limit of detection). This investigation also demonstrates that Alia Water technology can successfully reduce iron concentrations from 12.7ppm (Hach Calorimeter Instrument) down to 0.02ppm and Mn down to less than 0.01ppm.
* However raw sample was NOT acidified till three days later and therefore As levels are lower than what they actually were.
This case study also demonstrates the importance of onsite analysis of groundwater samples, particularly for arsenic in the presence of high iron concentration and consequently the need for PDV6000+ instrument. Portable digital voltammeter allows for quick, reliable and accurate analysis of toxic ions, such as arsenic and lead and others in groundwater.
Water Treatment Explanation
To clarify, the process of treating the water by the Drinking Water Plant. The raw water, pumped from bores in the ground was diverted from the pipe feeding into pH correction plant. Thus, no treatment whatsoever was carried out on the water before feeding it to the small Drinking Water Plant.
The other treatment train was: raw water from the extraction bores fed into the pH correction plant then to the far end pond and the water moved through the two subsequent ponds. Filter cloth barriers were used in a number of places in the ponds to make the flow uniform across the section of the ponds. This reduces turbulence and helps settlement of suspended solids.
