Industrial circulating water side stream treatment process

 Fiber Filtration—Controlled Release Dosing Process


The circulating cooling water is added to the coagulant through the jet and mixed evenly in the pipeline and then enters the high-efficiency fiber filter. The micro-flocculation reaction occurs in the reaction zone above the filter bed. The suspended matter in the water forms flocculent particles and the microbial sludge is fiberized together. The filter material is retained and removed, and the turbidity of the filtered water is less than 1NTU. Using this method, the orthophosphate in the side filter water can be absorbed and removed by the fiber filter material and the flocculent particles retained by it.

When the filtered side-flow cooling water passes through the dosing tank, the glassy “rusty dirt clean” water treatment agent dissolves into the water at a certain rate and releases polyphosphate with corrosion and scale inhibition effects, which can realize constant-rate dosing.

The process has the characteristics of simple flow, compact layout, convenient and flexible operation, etc. It can simultaneously remove harmful components such as suspended solids, orthophosphate and microbial sludge in industrial circulating cooling water, and at the same time supplement polyphosphate active ingredients to improve water quality. The purpose of improving corrosion and scale inhibition effects.

Cost and benefit analysis

The operating cost mainly includes the cost of coagulant and “rust scale net” (about 0.2 yuan/m3), electricity cost (mainly including the power consumption of the water inlet pump, the recoil pump and the roots blower), the total cost is less than 0.5 yuan /m3 is a more economical processing method.

Benefits include increasing the concentration ratio, reducing the water and sewage charges saved by reducing the amount of supplementary water and sewage, and reducing the cost of water treatment agent consumption, as well as improving the stability of water quality, extending the service life of equipment, improving heat transfer efficiency, and saving Benefits from manpower, etc.

The process is suitable for medium and small circulating cooling water systems without professional and technical personnel management.

 Fiber Filtration-weak acid resin softening process


After the circulating cooling water is added to the precipitant and coagulant through the jet, it is evenly mixed in the pipeline and enters the high-efficiency fiber filter. Part of the softening reaction and micro-flocculation reaction occur in the reaction zone above the filter bed, resulting in CaCO3 and Mg(OH) 2) The particles and suspended solids in the water are intercepted and removed by the fiber filter material. The hardness of the filtered water (permanent hardness is not carbonate hardness) is reduced by about 1mmol/L, turbidity <1NTU, alkalinity appropriately increased, and pH value Rise to around 9.5.

The use of weak acid (acrylic acid) cation exchange resin can further reduce the hardness and alkalinity of the water to below 1mmol/L, and the pH of the effluent is 3-6. After reaching the water quality requirements of the supplemental water, it can be returned to the cooling water system, and the effluent can retain 50% % Above water treatment agent.

Cost and benefit analysis

The operating cost includes the consumption of precipitant and coagulant and the cost of weak acid resin regeneration (using sulfuric acid as a regenerant), of which the cost of medicament is 0.63 yuan/m3, plus electricity (mainly including water inlet pump, recoil pump and Roots blower) The total cost is less than 1.0 yuan/m3, which is more economical than other methods such as reverse osmosis.

Benefits include the water and sewage charges saved by reducing the amount of supplementary water and sewage, the cost saved by reducing the consumption of water treatment agents, and the benefits of improving the stability of water quality, extending the service life of equipment, and improving heat transfer efficiency.


The main equipment includes high efficiency fiber filter and weak acid cation exchanger. The process and equipment have the characteristics of simple, compact, convenient and flexible operation. The “integrated” equipment that combines the reactor and the filter into one, enables the process to be completed in the integrated equipment, and is easy to realize industrialization. Using the upper space of the filter layer in the high-efficiency fiber filter as the reaction zone of the “three-in-one” treatment process can save a bulky reaction clarification tank. Due to the existence of the “micro-flocculation effect”, the reaction generates tiny sediments Particles can be removed by the deep, high-precision filtration of the fiber filter material, which has the advantages of high filtration accuracy, long operation cycle, and large dirt holding capacity.

Weak acid cation exchange resin has no effect on permanent hardness removal. It does not produce strong acid when softening water. The resin is easy to regenerate after failure. Usually the acid consumption is only 1.1 times the theoretical value, so it is more economical. The process is flexible in operation and can be adjusted according to the water quality. Its water consumption is less than 10%, and it is suitable for large-scale industrial circulating cooling water systems.

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