TasWater engaged with Netco Pumps to explore different options and, after speaking with a lot of industry contacts, Netco ran a trial at the treatment plant with ACTI-Mag product from Calix. This immediately proved successful as the product had a much finer molecular structure and proved much easier to pump and handle as well as having a good reactivity time. ACTI-Mag is a concentrated stabilised suspension of magnesium hydroxide, an inorganic compound with the chemical formula Mg(OH)2. The method by which Calix produces the raw product results in a product with a much higher surface area which has multiple benefits.
A few months later TasWater were experiencing odour issues in the Hobart Eastern Shore network where stations were being injected with oxygen to try and control the odour. TasWater decided to engage Netco again to run a trial using ACTI-Mag dosing at 4 stations over the summer months to treat the odour and measure results. Netco Pumps installed and commissioned dosing packages at the sites and the result was excellent, with H2S measured at the receiving treatment plant reduced to almost zero.
Netco general manager Nathan Cruickshank commented – “Calix’s ACTI-Mag ticked all our boxes for TasWater. While the dosing units were only supposed to be temporary, they are still in place today with just a few upgrades to make them more functional. The combination of an excellent product coupled with our unique delivery and maintenance service has resulted in a very painless experience for TasWater and its operators, at the same time solving odour issues and protecting their assets from the stations through to the treatment plant”.
ACTI-Mag has a higher neutralising value per kilo when compared with caustic while being significantly safer to handle than other traditional alkalis, making it a very safe and cost competitive option for hydrogen sulphide gas (H2S) control in wastewater treatment.
ACTI-Mag can also safely and cost-effectively reduce phosphorus from the wastewater discharge, which improves the wastewater quality.
Netco Pumps recommends ACTI-Mag because it has a high surface area, which means it reacts quicker, and is a stable, easily flowing 60 per cent concentrated solution resulting in hassle-free dosing.