How should I choose between ATMP and HEDP?
There are several key factors to consider when selecting ATMP (1-hydroxyethylidene diphosphonic acid) and HEDP (1-hydroxyethane-1,1-diphosphonic acid) as industrial circulating water treatment agents:
Purpose of application: ATMP is usually used as a scale inhibitor and is more effective in inhibiting calcium carbonate, calcium sulphate and barium sulphate scales, whereas HEDP is an organophosphonic acid scale and corrosion inhibitor, which is effective in inhibiting calcium carbonate, calcium sulphate and calcium phosphate scales.
Environmental impact: ATMP has better biodegradability and environmental compatibility, while HEDP, although it has less impact on the environment, has relatively low biodegradability and may have some accumulation in the water body.
Operating conditions: The applicable pH ranges of ATMP and HEDP are different, and it is necessary to choose the suitable agent according to the specific conditions of the circulating water system. ATMP is effective in a wide pH range, while HEDP is more effective in a certain pH range.
Cost-effectiveness: The price and concentration of ATMP and HEDP may be different, and need to be considered according to the cost and treatment effect.
System materials: Different scale inhibitors may have different corrosive properties on different materials, and the compatibility of circulating water system materials with scale inhibitors needs to be considered.
Regulatory requirements: Some regions may have specific regulatory restrictions on the use of industrial circulating water treatment agents, and selection should ensure compliance with local regulations.
Based on the above factors, if the circulating water system is primarily required to prevent the formation of calcium carbonate and calcium sulphate scales, and environmental friendliness is a high priority, ATMP may be a better choice. Whereas, if calcium phosphate scaling is a problem in the system, or if a more effective scale inhibitor is required at specific pH conditions, HEDP may be more suitable. The final choice should be based on detailed system analysis and professional advice.