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In recent years, acid electrolyzed water technology has been recognized by more and more people, and the application of acidic electrolyzed water technology in medical treatment, food processing, livestock and poultry breeding, agricultural planting, environmental sanitation and other fields has also received more extensive attention.
Recently, "How to choose a suitable electrolyzed water device?" has become the most frequently asked question for channel administrators. Therefore, in response to everyone's doubts, let's talk about how to select the type of acid electrolyzed water equipment with different principles, different water yields, and different effluent concentrations.
1. Water production index of acid electrolyzed water equipment
Before we start, let's talk about the key parameters and technical indicators of an electrolyzed water device. Generally, there are the following indicators:
Equipment type: According to the generation principle of electrolysis equipment, it can be divided into diaphragm type electrolysis equipment (two-chamber type/three-chamber type) and non-diaphragm type electrolysis equipment; diaphragm type electrolysis equipment mainly produces acid oxidation potential water, and non-diaphragm equipment mainly produces slightly acidic water Electrolyzed water; compared with non-diaphragm type electrolysis equipment, diaphragm type electrolysis equipment produces less water, and must adopt raw water treatment measures; and the acid oxidation potential water produced by diaphragm type electrolysis equipment can meet the requirements of high-level disinfection. Alkaline electrolyzed water is produced, which can be washed with water for decontamination and biofilm removal.
Electrolyte type: The electrolyte of diaphragm electrolysis equipment is mostly sodium chloride, while the electrolyte of non-diaphragm electrolysis equipment is generally hydrochloric acid or a mixture of hydrochloric acid and sodium chloride;
Equipment water output: continuous (0.1t/h-100t/h), storage tank type, the current electrolysis equipment on the market is mostly continuous water output, and the difference in water production is relatively large;
Effective chlorine concentration in effluent: mostly 10-80ppm, the effective chlorine concentration in the water produced by the electrolysis equipment of individual manufacturers can be higher than 80ppm, and even reach 1000ppm. The concentration of available chlorine is one of the main indicators that determine the sterilization efficiency of acidic electrolyzed water. Therefore, it is very important to select suitable acidic electrolyzed water equipment for different application scenarios. In addition, for some specific fields, such as the medical industry, the effective chlorine in the effluent is very important. The concentration should also meet the national standard/industry standard;
The pH value of the effluent: 2.0-6.5, the pH value is the main factor determining the content of hypochlorous acid in the acid electrolyzed water. At the same time, for the disinfection of skin mucous membranes, oral mucous membranes, and vaginal mucous membranes, there are also certain requirements for pH.
Residual chloride ion concentration: ≤1000ppm, residual chloride ion is one of the important factors affecting metal corrosion. Studies have shown that the corrosion resistance of stainless steel is closely related to the performance of its surface passivation film, and chloride ion is the most important aggressive ion to destroy the passive film of stainless steel. Germany's "Instrument Value Preservation Cleaning and Disinfection Treatment 2016 10th Anniversary Edition" pointed out that at room temperature, the chlorine content is less than 120mg/L, and the possibility of pitting corrosion is very small. As the chlorine content increases, the likelihood of pitting corrosion increases dramatically.
Oxidation-reduction potential (ORP): 600-900mV or more than 1100mV, the ORP value of slightly acidic electrolyzed water is 600-900mV, and the ORP value of acidic oxidation potential water is more than 1100mV. The redox potential is also an important factor in determining the sterilization effect of acidic electrolyzed water. one of the determining factors;
Electrolyzer life: 1000-10000h, the electrolyzer is the core component of the acid water electrolysis equipment, and its life directly determines the operating cost of the equipment in the entire cycle;
Electrolyte consumption: Electrolyte consumption is also one of the factors that determine the operating cost of the equipment;
Product Qualification: Disinfection Equipment/Medical Equipment Qualification
Others: Raw water supply requirements, equipment power, etc.
2. Selection based on application fields and application scenarios
Selection guidelines: build solutions with electrolysis water technology as the core, estimate water consumption based on usage planning and usage processes, and determine parameter indicators based on industry characteristics.
The application of acidic electrolyzed water in different fields has different characteristics and corresponding regulations. Therefore, our recommendations for equipment selection according to different industries are as follows:
1. Hospital Disinfection Supply Center/Endoscopy Center
In the medical field, especially the disinfection supply center and endoscopy center, in accordance with the "WS310.2-2016 Disinfection Supply Center Part 2 Cleaning, Disinfection and Sterilization Technical Operation Specifications" and "WS 507-2016 Flexible Endoscope Cleaning and Disinfection Technical Specifications" "Requires that acidic oxidation potential water equipment should be used (effective chlorine concentration 60 ± 10ppm, pH value 2.0-3.0, redox potential > 1100mV), and the residual chloride ion concentration should be controlled within the range of 100mg/L to avoid the cleaning and disinfection process. Corrosion of the device; and the device should have medical device qualification.
In addition, when cleaning and disinfecting endoscopes, there are also automatic endoscope cleaning and disinfection machines that use alkaline electrolyzed water and acid electrolyzed water as cleaning and disinfection media.
2. The field of hospital stomatology
In the water disinfection of the comprehensive dental treatment table, considering the possible corrosiveness of acidic electrolyzed water, the irritation of electrolyzed water entering the patient's oral cavity, and the normal pH value of the oral environment, it is recommended to use slightly acidic electrolyzed water equipment for continuous water supply. The effective chlorine concentration of the slightly acidic electrolyzed water should be lower than 10ppm; and the slightly acidic electrolyzed water equipment should have the qualification of disinfection equipment.
The water output of the equipment should be determined according to the number of dental chairs (the maximum water consumption per hour of a single dental chair is about 7L).
3. Food processing field
In the field of food processing, the first step is to estimate the water production capacity and storage barrel volume of the equipment according to the planning and use process and peak water consumption at the point of use of electrolyzed water. If the water consumption is large, it is recommended to use a non-diaphragm electrolysis device.
Diaphragm electrolysis equipment has a lower water output, while non-diaphragm electrolysis equipment has a higher water output. At present, the largest non-diaphragm electrolysis equipment on the market has a water output of 100t/h.
When using acidic electrolyzed water for food cleaning, it is recommended to use a concentration of no more than 60ppm. In an environment where acidic electrolyzed water frequently contacts metal utensils, it is recommended to consider the residual chloride ion limit of the equipment effluent when selecting equipment.
In addition, in a food processing plant, if it involves personnel disinfection, equipment disinfection, tool cleaning, food cleaning and other aspects, it is necessary to plan and design for the entire plant.
4. Agricultural planting field
In the field of agricultural planting, it is often necessary to use acidic electrolyzed water and alkaline electrolyzed water alternately. Therefore, diaphragm electrolysis equipment can be selected.
When sodium chloride is used as the electrolyte, sodium ions will cause soil compaction. Therefore, in the field of agricultural planting, it is recommended to use potassium chloride as the electrolyte, and a trace amount of potassium can be added during irrigation or spraying.
Equipment water yield can be estimated based on planting area, spraying or irrigation frequency.
5. Livestock and poultry farming
In the field of livestock and poultry breeding, since the farms mostly use groundwater, the particles and hardness in the water are high. When using diaphragm electrolysis equipment, more raw water treatment equipment and facilities are required, and the water production is relatively low. Therefore, it is recommended to use non-diaphragm electrolysis equipment as much as possible, which can avoid excessive raw water treatment and provide more electrolyzed water production.
In addition, the concentration of organic pollutants in livestock and poultry farms is relatively high, and the effective chlorine concentration of the acid electrolyzed water recommended to be used should be higher than 80ppm to achieve a sufficient disinfection effect.
Using electrolyzed water technology to solve problems in various industries, equipment selection is only a part of it, and more often it is necessary to comprehensively consider multiple factors such as equipment, parameters, systems, processes, accessories, etc. to determine the optimal solution. The application process of electrolyzed water is also a very important part of the future development of electrolyzed water technology.
