- Call us on 800-331-3314
Spokane County Regional Water Reclamation Facility, operated by Jacobs, processes 8 million gallons per day (mgd) of wastewater collected from both incorporated and unincorporated areas around the Spokane Valley.
IER proposed ALKA-Mag+ (60% Mg(OH)2) as the alternative to caustic soda for cost, safety, and performance benefits.
case study summary
Challenges
- Jacobs was using ~1400 gpd of 25% NaOH and wanted to find a safer and more cost-effective alternative for pH and alkalinity control.
Objective
- Replacement of caustic soda (NaOH) with magnesium hydroxide (Mg(OH)2) for cost, safety, and performance benefits.
Solution
Solution
• IER proposed ALKA-Mag+ (60% Mg(OH)2) as the alternative.
• After seeing usage reduction in bench top experiments, Jacobs was interested in performing an on-line trial of ALKA-Mag+.
• IER provided and installed the equipment needed for a 90 day trial. This included two 1000 gallon poly tanks with agitators and a metering pump with associated feed lines and valves.
Background
Replacement of caustic soda (NaOH) with magnesium hydroxide (Mg(OH)2) for cost, safety, and performance benefits. Spokane County Regional Water Reclamation Facility, operated by Jacobs, processes 8 million gallons per day (mgd) of wastewater collected from both incorporated and unincorporated areas around the Spokane Valley. This facility has a National Pollutant Discharge Elimination System (NPDES) permit to discharge to the Spokane River.
Wastewater is treated with a state-of-the-art Membrane Bioreactor (MBR).
Benefits of ALKA-Mag+
The conversion from caustic to ALKA-Mag+ resulted in a 68% reduction in chemical usage (by volume).
The coagulation properties of ALKA-Mag+ provided a reduction in sludge volume, which resulted in a reduction of sludge hauling costs.
Summary
The results of this 90-day trial gave Jacobs moderate cost savings, and the operators did not have any significant issues with the reliability of the feed system.
Magnesium hydroxide provides two hydroxides for alkalinity compared to only one for caustic soda. Replacing approximately 1400 gpd of caustic soda with only 450 gpd of AMALGAM, allowed a 68% reduction in chemical usage (by volume).
During the trial, it was also observed that the centrifuge cake solids had increased by a few percentage points, resulting in a reduction in sludge volume.
In April 2019 nearly 200 tons of sludge were hauled using 25% caustic soda, hereas only 100 tons was hauled in April 2020 using AMALGAM.
This reduction of sludge was again duplicated in May 2020, and has reduced sludge hauling costs.
In addition to the chemicial usage reduction, any resulting improvement in dewatering would become another benefit of the change.
ALKA-Mag+ is a safe, earth-friendly and cost effective alternative to caustic soda, with coagulation properties that allow a reduction in sludge volume and consequently in sludge hauling fees.
Although Jacobs is still evaluating other options, IER was able to offer significant cost savings, as a result of both chemical usage and sludge reduction.
IER takes pride in providing high-quality products, dedicated delivery specialists and equipment, technical credibility in the applications of water and wastewater treatment, and proactive on-site technical service.
Related stories
May 18, 2020 \ ACTI-Mag \ Improving the Sustainability of Water Treatment \ Food & Beverage
An innovative mixed-metal hydroxide for pH control and wastewater microorganism activity
An innovative mixed-metal hydroxide for pH control and wastewater microorganism activity at a meat processing facility in the United-States.
December 14, 2018 \ ACTI-Mag \ Improving the Sustainability of Water Treatment \ Municipalities
Hydrogen Sulfide (H2S) in wastewater odor control case study, El Centro 
Magnesium hydroxide ( Mg(OH)2 ) reduces the odor to manageable levels at El Centro, Southern California, United-States.
September 11, 2020 \ ACTI-Mag \ Improving the Sustainability of Water Treatment \ Food & Beverage
Converting from caustic to magnesium hydroxide
Spokane County Regional Water Reclamation Facility, operated by Jacobs, processes 8 million gallons per day (mgd) of wastewater collected from
ALKA-Mag+
A safe and cost effective alternative to the use of sodium hydroxide (caustic soda) for wastewater alkalinity and pH adjustment.
Read the product data sheetHigh quality technical service played a critical part in this customer success story. By working along side the plant managers and understanding their specific requirements, IER was able to offer an innovative customised solution, specifically aimed at solving the plant’s challenges.
Latest News
June 09, 2021
AMALGAM Mg(OH)2: alternative to caustic soda for wastewater treatment – with Birch Bay Water & Sewer
A safe and cost-effective alternative to the use of sodium hydroxide [caustic soda, NaOH] for wastewater alkalinity and pH adjustment
June 09, 2021
Magnesium Hydroxide’s Role in Sludge Compaction
Trying to determine how to improve wastewater sludge dewatering and compaction can be a very complicated process. The root cause
March 26, 2023
Video – Exploring the Reactivity of ALKA-Mag+ VS Competitors
Join Doug and John from IER (Inland Environmental Resources Inc.) as they explore the reactivity difference between two competing magnesium
March 21, 2023
IER News Issue 10 – March 2023
A Letter from Doug Kelley, President of IER Hello, everyone. I am writing this message on March 20th, the last
March 21, 2023
Introducing Ryan Smith
Before joining IER, Ryan Smith ran his own construction company that focused on finishing carpentry in new homes until the
GOT A QUESTION? WANT A QUOTE?
CALL US: 800-331-3314
Want to schedule a chat with one of our technical sales managers?
Or use the form below, we’ll be in touch soon.