Quaker recently received a call from a customer concerned about the safety of their coolant system, specifically regarding microbial growth and unpleasant odors. The company quickly dispatched a team to the site to assist in resolving the issue promptly. During on-site discussions with the factory’s technical staff, it became clear that the coolant was experiencing a significant drop in pH, which can cause irritation to the skin and mucous membranes.
Following an investigation, Quaker submitted a detailed analysis report to the customer’s chemical management department, highlighting a high level of bacterial contamination in the coolant. This kind of microbial presence is not uncommon, as airborne microorganisms are often introduced into the system, especially in environments where air quality is a concern. Over time, these microbes have adapted to the local conditions, leading to varying types of contamination across different facilities.
In general, microbial contamination and odor generation are closely linked to several factors:
1. **Coolant pH Level**
- pH measures the acidity or alkalinity of an aqueous solution.
- A low pH can disrupt the solubility balance of alkanolamines, causing them to volatilize and release an ammonia-like odor.
- The ideal pH range for coolant is typically 9.0–9.5.
- Microbial activity often leads to acid production, which lowers the pH. Raising the pH can help suppress microbial growth and reduce odor issues.
2. **Prolonged Microbial Contamination**
- Microbes consume nutrients like nitrogen compounds (e.g., alkanolamines) to grow, producing metabolic byproducts that contribute to foul smells.
- These byproducts can accumulate in the coolant, worsening the odor problem over time.
- Regular maintenance and early intervention are crucial to prevent such issues from escalating.
3. **Systemic Contamination**
- Oils from machinery, such as spindle oil, hydraulic oil, and rail oil, can leak into the coolant system, altering its composition.
- Certain oils, like those containing zinc additives, may negatively impact aluminum-based systems due to their electrochemical properties.
- Proper filtration and cleaning methods are essential to remove these contaminants and maintain coolant performance.
Based on the customer's situation, when the pH dropped below the acceptable threshold, microbial growth increased significantly. To address this, Quaker recommended raising the pH using amines, which helps control microbial activity and minimize volatile odors. The company also provided a dynamic coolant management program aimed at maintaining a stable, bio-stable environment—preventing microbial growth and reducing odor emissions.
Thanks to the recommendations from Quaker, the customer implemented the necessary corrective actions and successfully resolved the issue. Quaker has always prioritized on-site technical support and is committed to helping customers overcome application challenges effectively and safely.
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