PESA: The Green Guardian in the Water Treatment Field

 I. Introduction

In the current context of water resource protection and industrial sustainable development, water treatment technologies are of utmost importance. Polyepoxysuccinic acid (PESA), as a green and multi - functional chemical, demonstrates excellent performance in the water treatment field, providing innovative solutions to various water treatment challenges.

 II. Applications of PESA in the Circulating Cooling Water System

 (I) High - efficiency Scale Inhibition

1.The Problem of Scaling

During the long - term operation of the circulating cooling water system, due to water evaporation, the concentrations of dissolved calcium and magnesium ions in the water increase, making it extremely likely to form scale such as calcium carbonate and calcium sulfate. These scales adhere to the surfaces of pipes and heat exchangers, reducing the heat transfer efficiency and increasing energy consumption. For example, in the circulating cooling water system of a thermal power plant, due to severe scaling, the heat transfer efficiency of the heat exchanger decreased by 20%, resulting in a significant increase in coal consumption every month.

2.The Mechanism of PESA

The carboxyl and other active groups in the PESA molecule can chelate with calcium and magnesium ions to form stable soluble complexes. These complexes are dispersed in the water, preventing calcium and magnesium ions from forming scale crystals and depositing on the equipment surface. At the same time, PESA can adsorb on the surface of the formed tiny scale particles, inhibiting their further growth and aggregation.

3.Practical Results

After adding PESA to the circulating cooling water system of this thermal power plant, the amount of scale on the pipes and heat exchangers decreased significantly. After a period of operation, the heat transfer efficiency recovered and increased by about 15%, and the coal consumption was reduced by about 10% per month, effectively reducing the energy cost.

 (II) Corrosion Inhibition and Protection

1.The Threat of Corrosion

Circulating cooling water usually contains corrosive substances such as dissolved oxygen and chloride ions, which can corrode metal pipes and equipment, shortening the service life of the equipment and even causing safety accidents such as leaks. For example, the circulating cooling water pipes of a chemical enterprise often perforated due to corrosion, and a large amount of funds were spent on maintenance and replacement every year.

2.The Corrosion Inhibition Principle of PESA

PESA can form a dense adsorption film on the metal surface. On the one hand, this film can isolate the metal from the corrosive medium, reducing the erosion of dissolved oxygen and chloride ions on the metal. On the other hand, the active groups in the PESA molecule can chemically react with the metal to form chemical bonds, enhancing the stability of the protective film.

3.Application Achievements

After adding PESA to the circulating cooling water of this chemical enterprise, the corrosion rate of the pipes decreased significantly. The pipes that originally needed to be replaced every year now have a service life extended to 3 - 5 years, greatly reducing the equipment maintenance and replacement costs and ensuring the continuity of production.

 III. Applications of PESA in Boiler Water Treatment

 (I) Preventing Scale Formation

1.The Hazards of Boiler Scaling

In a boiler, calcium and magnesium ions are more likely to form hard scale under high - temperature and high - pressure conditions. Boiler scaling not only reduces the thermal efficiency and increases fuel consumption but may also cause local overheating, leading to serious safety accidents such as tube explosions. According to statistics, energy waste caused by boiler scaling can reach 10% - 30%.

2.The Scale - Inhibition Efficacy of PESA

In boiler water, PESA can tightly bind to calcium and magnesium ions to form stable and soluble chelates, preventing calcium and magnesium ions from forming scale on the inner wall of the boiler. At the same time, PESA can change the growth morphology of scale crystals, making them loose and dispersed, and less likely to adhere to the boiler surface.

3.Case Analysis

The steam boiler of a textile factory used to require multiple chemical cleanings every year due to scaling, which not only affected production but also caused certain damage to the boiler. After using PESA as a boiler water treatment agent, the amount of scale generated in the boiler was greatly reduced. The number of chemical cleanings decreased from 4 - 5 times a year to 1 - 2 times a year, extending the service life of the boiler and reducing operating costs.

 (II) Optimizing Water Quality

1.The Impact of Water Quality on Boilers

Impurities and metal ions in boiler water can affect the quality of steam, resulting in problems such as steam carrying water and impurity deposition, which in turn affect the production process and product quality. For example, in the food processing industry, poor - quality steam may contaminate food, causing food safety problems.

2.The Water Quality Optimization Role of PESA

PESA can chelate metal ions such as iron and copper in the water, reducing their content and minimizing the impact of these metal ions on steam quality. At the same time, the dispersing effect of PESA can keep the suspended impurities in the water in a dispersed state, preventing them from depositing inside the boiler, thereby improving water quality and ensuring the purity of steam.

3.Practical Application Effects

After a food factory adopted the boiler water treatment plan with PESA, the steam quality was significantly improved. The impurity content in the steam decreased by more than 80%, the quality of the produced food became more stable, and the defective rate decreased significantly, improving the economic benefits of the enterprise.

 IV. Applications of PESA in Sewage Treatment

 (I) Removal of Heavy Metal Ions

1.The Problem of Heavy Metal Pollution

Industrial sewage often contains heavy metal ions such as lead, mercury, cadmium, and chromium. These heavy metal ions are highly toxic and pose a great threat to the environment and human health. If discharged directly without effective treatment, they will pollute soil and water sources, threatening the ecological balance.

2.The Removal Mechanism of PESA

PESA can form stable complexes with heavy metal ions. These complexes have a relatively low solubility, and by adjusting the pH value and other methods, the heavy metal ions can precipitate from the sewage. At the same time, PESA can also adsorb some heavy metal ions on its surface through the adsorption effect, further improving the removal efficiency.

3.Treatment Achievements

After treating the heavy - metal - containing sewage of an electroplating factory with PESA, the removal rate of heavy metal ions such as lead and mercury reached over 95%. The treated sewage met the national discharge standards, effectively reducing the pollution of heavy metals to the environment.

 (II) Sludge Reduction

1.The Dilemma of Sludge Treatment

A large amount of sludge is generated during the traditional sewage treatment process. The treatment and disposal of this sludge are costly and prone to causing secondary pollution. How to effectively reduce the sludge production is a research hotspot in the sewage treatment field.

2.The Sludge - Reduction Role of PESA

PESA can change the metabolic pathways of microorganisms, inhibit the growth and reproduction of microorganisms, thus reducing the amount of sludge produced. At the same time, PESA can improve the decomposition efficiency of organic matter in sewage, converting more organic matter into carbon dioxide and water, further reducing the sludge production.

3.Application Example

After adding PESA to the biochemical treatment stage of an urban sewage treatment plant, the sludge production decreased by 30% - 40%, reducing the sludge treatment cost and alleviating the pressure on the environment.

 V. Conclusion

Polyepoxysuccinic acid (PESA), with its outstanding performance in circulating cooling water systems, boiler water treatment, and sewage treatment, has become an indispensable green solution in the water treatment field. With the continuous improvement of environmental protection standards, PESA is expected to be applied in more water treatment scenarios, making greater contributions to the protection and sustainable utilization of water resources.