Magnesium Hydroxide Liquid Dosing significantly helps solving H2S odors issues at Cassowary Coast Region.Download the PDF Now
Reduced H2S generation and release within the catchment.
Significant FOGs reduction within the catchment.
Savings on STP chemical use and maintenance.
Optimization of chemical usage, enabled by our own SCADA monitoring services and reporting.
Ongoing monitoring and customer support during COVID travel restrictions
* SCADA: Supervisory Control and Data Acquisition.
Mission Beach is a mixed residential and tourist area in the Queensland wet tropics region and is home to the iconic Cassowary.
A sewerage scheme was commissioned by Cassowary Coast Regional Council in 2006 to collect the wastewater from three constituent communities and pump by two major stations, at Wongaling Beach and North Mission Beach, to the Main Transfer Pump Station (MTPS).
The MTPS then pumps 23km to the Tully Sewerage Treatment Plant (STP).
This sewer main suffered significant corrosion due to “rotten egg gas” (H2S) release in the drained sections. The Tully plant is designed for partial bio-phosphate removal with trimming by liquid alum dosing and powder lime dosing for alkalinity and pH correction.
A trial of Magnesium Hydroxide Liquid (MHL) dosing commenced in December 2017 with the primary objective being to control septicity, odor and corrosion issues. IER also proposed the additional objectives:
The trial eliminated odors by maintaining pH between 8.2 and 8.5. Pump station cleaning has been substantially reduced due to decreased FOGs accumulation. The lime dosing system was prone to blockage and breakdowns, however dosing of Magnesium Hydroxide Liquid has allowed suspension of lime dosing. Also, the Alum dose rate has been reduced by more than 75% whilst still consistently meeting the phosphate effluent discharge limits
Fats, oils and greases can build up and become fatbergs.
Fatbergs are caused when oils and fats are tipped down the drain and congeal with other products, including so-called flushable wet wipes.
While each state has their own utility providers, there were at least 360 blockages per months caused by fatbergs in sewers serviced by QUU — which take in the Brisbane area and four other local councils. That’s out of a total of 3,500 blockages in QUU sewer pipes that together cost $1.2 million to clear.
Fatbergs also caused almost 250 sewage overflows.
But fats, oils and greases also play an important role in wastewater treatment plants, particularly those with anaerobic digesters that capture biogas to generate electrical and thermal energy.
Dosing your network with Magnesium Hydroxide significantly eliminates H2S odors and saponifies and dissolves fats oils and greases (FOGs).
Read the article: The Courier Mail
Magnesium Hydroxide is a concentrated and stabilised suspension of magnesium hydroxide (also known as milk of magnesia). An inorganic compound with the chemical formula Mg(OH)2.
Highly fluid, Magnesium Hydroxide has proven to flow easily in most dosing systems. With a higher neutralising value per dry kilo when compared with caustic and lime and being significantly safer than other traditional alkalis, Magnesium Hydroxide is a very cost competitive option for hydrogen sulphide gas (H2S) control in sewers and industrial waste treatment as well as for several other applications including phosphorus and partial nitrogen removal from wastewater.
Magnesium Hydroxide has several advantages over other generic MHLs.
Watch our slurry chemistry podcast to understand Magnesium Hydroxide’s reactivity in wastewater treatment:
Following the success of the trial at Mission Beach, IER was awarded a multi-year contract for the supply of magnesium hydroxide, dosing equipment and monitoring services.
Primary objectives and success criteria for the network
H2S(aq) => HS – + H +
At high pH HS – predominates
IER leverages a culture of innovation to provide fully customised services such as design expertise, engineering know-how, detail engineering, installation, piping and commissioning services to provide turnkey systems for chemical dosing of Magnesium Hydroxide Liquid (MHL).
Our engineered and cost-effective solutions are tailored to meet your specific needs and budget.
Quick to install – our modular dosing units can be delivered on site by truck and are fast to set up and connect.
The following metrics are being continuously monitored within the network, through the customer and IER’s private SCADA control networks.
Reduce H2S and odors to negligible levels, FOG build-up & cleaning
Observations show that Magnesium Hydroxide:
• Reduced H2S and odor to negligible levels within 3-4 days of dosing.
• Eliminated FOGs build-up within the network and allowed rags to flow through to be captured by the STP.
• Eliminated the use of costly vacuum trucks to clean out ‘fatbergs.’
Watch our success story – Magnesium Hydroxide Liquid for odor control
Wastewater has large quantities of low density, long-chain fatty acids.
Magnesium hydroxide slowly releases hydroxyl ions, which breakdown low-density, large-chain fatty acids into glycerol and various types of soap, both of which are more readily digested by bacteria in wastewater.
The Carboxylate salts that are produced further facilitate the breakdown of other fats.
A treatable nuisance
Magnesium Ammonium Phosphate (MAP), commonly known as Struvite, is a crystalline precipitate of Magnesium, Ammonia, and Phosphate.
Mg²+ + NH4 + + PO4³- + H2O => Mg.NH4.PO4.6H2O (s)
Nuisance Struvite forms in pipe bends due to pressure differential in the flow, release of dissolved CO2 & a small rise in pH . This leads to a crystalline build-up creating blockages and restricting flow.
The advantage of dosing magnesium hydroxide is that it precipitates ammonia and phosphate as struvite directly in the sludge matrix and stops uncontrolled struvite forming in pipelines and on treatment structures.
for chemical dosing, wherever you are located.
We can help you review and optimise your wastewater process to make sure your system is running smoothly and cost effectively.
The unique and highly reactive property magnesium hydroxide offers many benefits:
Engineered by us, our cost-effective dosing solutions are designed to meet your specific needs and budget.
Quick to install, IER modular dosing units can be delivered to site by truck and are fast to set up and connect.
IER leverages a culture of innovation to provide fully customised services such as:
…so that you can review your network, get the information you need – when you need it – to make sound decisions based on reliable data.
Magnesium hydroxide 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 sewers.
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