Original: Preface to Dong Xingwen How should I express it? [GB28234-2020] I always think there is a problem. On April 27 this year, my colleague asked an expert who had participated in the three versions of [GB28234] in a group because of the product issues of our company [GB28234-2020]. It was nothing wrong. Later, because someone asked me about the trouble, I joined the group chat. After reading the discussion in the group before, one of the generals said: [GB28234-2020] needs to be changed. The group leader, a doctor, replied: [GB28234-2020] No problem. I was a little moved by these two sentences, so I wrote an article along with other questions. I think the article is written clearly and easily understood, and I am very kind and clicked until it is. I posted it in the group managed by the blog the next day. In the technical exchange group that claims to be professional, no one really answers my doubts about [GB28234-2020], only screen sweeping and other attacks. Until the reply to the blog in the evening, I read the reply content and had three feelings: (1) The blog should be a participant in the formulation of [GB28234-2020], but I don’t know if the views and remarks he involved represent the consensus between the formulation of [GB28234-2020] and the participants? (2) Answer the question that is not. Maybe I have really problems with my expression and level. I didn’t understand it if I should, of course I might pretend not to understand it. I said that the ambiguity in the definition of [GB28234-2020] should be eliminated, and the similarities and differences in the sterilization effects between equipment caused by the ambiguity of the definition of [GB28234-2020] should be eliminated, and he asked me to put some effort into the design of my own product; I talked about the upper limit of the physical and chemical indicators of [GB28234-2020], and he told me that the original intention of the invention deviated from slightly acidic electrolytic water (I am ignorant, who was the inventor? Where did I publish the original intention?)… (3) As a former partner of the proposer of the term "ginseng and radish", isn't Huo Bo the real advocate of this technology? In fact, I never object to any technical process including "gluten radish into ginseng". We have basically done various crafts in recent years, and it depends on the choice of parents' food and clothing. Only by adapting to the market can we survive. In order to improve my expressiveness, avoid answering questions that are not answered. This article first writes out your doubts about [GB28234-2020]. In order not to be kicked out of the group by others and to be responsible for their own speeches, this article was published on the Fangxin official account.  If two people have the same priors, and their posteriors for a given event A are common knowledge, then these posteriors are equal. This is a sentence that was made popular by Wan Weigang. It is placed here, hoping that there will be a rational and sincere debate below. It is not easy to formulate national standards. The predecessors and experts involved in the standard formulation have devoted a lot of effort, promoting the development of acidic electrolyzed water generators and providing a basis for our promotion. However, there is no unchanging absolute standard. The micro-acidic electrolyzed water generator has developed very rapidly in the past two years. With so many colleagues conducting research, it is bound to promote its development. The calibration time has not changed so much yet. We cannot use the development of the market and technology in the past two years to deny the efforts and dedication of the predecessors and experts who set the standards. We sincerely thank the formulators of the national standard for the convenience they have brought us. We hope that experts can interpret it in a timely manner to solve practical problems. I also hope that the experts will forgive my limited knowledge level and candid way of expression. [GB28234-2020] Mathematical Expression of Doubt One Note 1: Universal definite equations and Logical Derivations. Compared with the "GB 28234-2011 Safety and Hygiene Standard for Acidic Electrolyzed Electrolyzed Water Generators", the "GB28234-2020 Hygiene Requirements for Acidic Electrolyzed Water Generators" has added contents such as micro-acidic electrolyzed water generators, but narrowed the scope of requirements and deleted the safety requirements. The first point of doubt is the definition of slightly acidic electrolyzed water. In the absence of other national standards regarding slightly acidic electrolyzed water, we can only consider it the only correct definition. We must manufacture equipment and produce slightly acidic electrolyzed water in accordance with its definition. Let's get straight to the point. Please look at the following picture:   This figure is the section of "GB28234-2020" 3.6 on slightly acidic electrolyzed water, which describes how a slightly acidic electrolyzed water generator generates slightly acidic electrolyzed water and its reaction equation. Similar descriptions appear more than once in the standard. I divide the content of 3.6 into three parts, namely A, B and C. Among them, the content A in the red box explains the conditions and methods of its generation; The content B in the blue box indicates the final generation result; The content C in the green box is the chemical expression from A to B. As a science student, one can translate the above content into mathematical expressions, solve mathematical problems, and then translate it back to handle real-world problems. Mathematical expression one: Does a universal definite equation have a unique and stable solution? Part A can be regarded as multiple independent variables x₁, x₂... The set of, and part B can be regarded as multiple dependent variables y₁, y₂... A collection of. Whether correct or not, it can be written as a universal definite equation. Solving a universal definite equation requires initial and boundary conditions. However, the mathematical definite solution conditions translated according to 3.6 are very limited and there is no solution for the time being. For this reason, based on experience, we need to artificially provide some definite solution conditions. This will inevitably lead to different solutions being generated when different people set different definite solution conditions. In other words, according to 3.6, the generalized definite equation expressed mathematically has no solution or multiple solutions, and there is no unique and stable solution. Let's translate this mathematical conclusion back to 3.6 and endow it with practical significance. We need to determine whether the content of 3.6 can comply with the above conclusion? That is, is the content of 3.6 valid? It is also necessary to introduce some physical and chemical knowledge related to the reaction of this system. Note 2. For example: Oxidation reactions may always exist in anodic reactions; (2) The reactions of different valence states of available chlorine in the chlorine evolution reaction may also exist to varying degrees. 

  The article "On Several Current Generation Methods of Slightly Acidic Hypochlorous Acid Water" was eventually published in three parts. During this period, we received calls and letters from teachers, scholars, users, colleagues and other friends. Thank you for your support and encouragement! Thank you for your corrections and instructions! Due to the limited word count for the published articles, many errors have not been corrected. We apologize for any inconvenience. Many friends said: Most of the content in the article was exchanged when they met before, and they didn't feel it deeply at that time. But after using the Fangxin equipment for a while and reading this article again, they found that they had a systematic understanding and new experience of the generation method of slightly acidic hypochlorous acid water. Everyone also raised some detailed issues they encountered during the usage process one after another for communication. Here, some representative questions are selected and answered collectively as follows: Question: Which generation method has a better sterilization effect? Answer: Firstly, regarding the sterilization effect of these methods, when using them specifically, you can check the third-party test report provided by the supplier. Secondly, in terms of the composition of the products, although the main content of the bactericidal component is hypochlorous acid, different generation methods may also produce oxides of different contents (which also have bactericidal properties). Some people think that containing multiple bactericidal components might make the sterilization more comprehensive. Some people also believe that when the antibacterial components are complex and directly used for food disinfection, they may react with certain components in the food, posing a food safety risk. Ultimately, whether it is the sterilization effect or food safety, it depends on whether the content values of specific substance components meet the relevant standards? As long as the content value of the product is within the standard range, it is qualified and safe. So, "Which generation method has a better sterilization effect after all?" I really can't answer this question. In the field of disinfection, I'm also a student. More experience and data are needed from teachers, experts, scholars and experienced people in this field.   2. Q: Why does my device consume more hydrochloric acid than the "over 100 grams of HCl" mentioned in the text? Answer: The Cl- conversion rate of this method is particularly high. Basically, it consumes over 100 grams of HCl to generate 1 ton of slightly acidic hypochlorous acid water with an effective chlorine concentration of 100 PPM. In some countries around the world, concentrated hydrochloric acid contains 36%HCl, while in others it contains 32%HCl. There are both 6%HCl and 3%HCl when using dilute hydrochloric acid. The "HCl" in my text refers to 100% HCl. Multiply the amount of hydrochloric acid consumed by the equipment by the actual concentration of hydrochloric acid. The actual consumption is consistent with the value in the text, and there is no difference. Our electrolytic conversion rate is very high, and it can usually be approximately calculated at a 100% conversion rate.   3. Q: Why is the effective chlorine content in my hypochlorous acid water qualified, but the chloride ion level is low? Answer: The original text [(3) How to prepare slightly acidic hypochlorous acid water with high concentration of available chlorine?] The effective chlorine detector is used to measure the concentration of chloride ions with a valence of 0 and above, while the chloride ion detector is used to measure the concentration of chloride ions with a valence of -1. The process of generating hypochlorous acid water is to convert the negative one-valent chloride ions into positive one-valent chloride ions. Therefore, under the condition of the same effective chlorine content, the lower the concentration of negative one-valent chloride ions in slightly acidic hypochlorous acid water, the better. A lower concentration indicates a higher conversion rate, lower residue, and no corrosion, suggesting that the electrolysis technology and process are better. Please refer to the self-test data of the slightly acidic hypochlorous acid water produced by the customer:   【pH6.5】   Effective chlorine content: 112mg/L 【 Concentration of negative one-valent chloride ions 27ppm】   Here, I would like to express my special gratitude to "Meticulous care, coming for beauty!" The self-inspection pictures provided by Abacho Medical Technology Co., Ltd. are welcome for everyone to extend and read [Abacho Initiates a 'Green Disinfection' Technology Revolution to Produce Long-lasting 'Green Disinfection' Products]. Readers are also welcome to test the relevant data of its self-produced slightly acidic hypochlorous acid water. Let's analyze and exchange together.   Note: The detection picture shows the brand, model and reading of the detection instrument, which only indicates the authenticity of the data source.   Supplementary explanation: For the method of electrolyzing dilute hydrochloric acid, it is generally believed that the three indicators of available chlorine concentration, pH and chloride ion content are interrelated and interdependent (that is, when the available chlorine concentration increases, pH decreases and chloride ion content rises). The electrolysis technology and process of the Fangxin version (please keep it confidential and do not disclose it to those with information) have transformed these three indicators into independent parameters, which are controllable and adjustable.   4. Q: How does Fangxin achieve the stability of slightly acidic hypochlorous acid water? Answer: (5) How to solve the stability of available chlorine content in slightly acidic hypochlorous acid water? If slightly acidic hypochlorous acid water is prepared and used immediately, its validity period is sufficient. However, if it is a disinfectant for sale on the market, among all the testing indicators, there are usually concerns about the stability test, that is, whether the validity period can meet 12 months or more? There are many formulas and processes for achieving the stability of slightly acidic hypochlorous acid water. Our technical process is just one of them. We believe that the comprehensive indicators might be very good. There are also many factors affecting stability, and the testing cycle for each batch is quite long. In response to customer demands, we are still conducting some related experiments up to now. We also sincerely welcome everyone to visit, offer guidance and communicate.     Previous content： On Several Current Generation Methods of Slightly Acidic Hypochlorous Acid Water (Part 1)   On Several Current Generation Methods of Slightly Acidic Hypochlorous Acid Water (Part 2)   On Several Current Generation Methods of Slightly Acidic Hypochlorous Acid Water (Part 3)

Original: Dong Xingwen, Chief Engineer of Yantai Fangxin Water Treatment Equipment Co., LTD Proofread by Liu Yan Date: October 10, 2020   (2) How to manufacture devices with larger flow rates or unlimited flow rates? There are not many enterprises on the market with a production capacity of equipment for manufacturing slightly acidic hypochlorous acid water exceeding 1T/H. As the world's factory, China has many large-scale processing enterprises of agricultural and sideline products, aquatic products and food, etc. They often need equipment capable of producing 10 to 300 tons of hypochlorous acid water per hour, and the 24-hour production days throughout the year exceed 330 days. High-flow or ultra-high-flow equipment cannot merely be a simple amplification or parallel connection of household or commercial low-flow devices. Just as a minivan manufacturer cannot immediately produce high-quality heavy-duty trucks, an excellent device needs to undergo long-term operation tests, and equipment manufacturers also need to gradually accumulate experience in practice. Through extensive use by customers from various industries at home and abroad, Fangxin has continuously broken through various limitations and can design and customize equipment for customers with any flow rate, any available chlorine content, and any pH value requirements.   (3) How to prepare slightly acidic hypochlorous acid water with high concentration of available chlorine? Some enterprises require high-concentration slightly acidic hypochlorous acid water, hoping for an effective chlorine concentration of 1000 to 10000 PPM to facilitate transportation. In different application scenarios, it is diluted into slightly acidic hypochlorous acid water of different concentrations according to the process requirements for use. If a single dilute hydrochloric acid solution is electrolyzed to produce slightly acidic hypochlorous acid water with an effective chlorine concentration exceeding 100ppm, the pH value will gradually drop below 5. As the pH of hypochlorous acid water decreases, the chlorine odor gradually intensifies until a pungent smell emerges. To increase the pH value, according to the existing technology, the proportion of sodium chloride in the electrolytic mixture is increased. However, this method will significantly increase the loss of electrolytic power, reduce the conversion rate of Cl-, and cause the concentrations of Na+ and Cl- in the acid water to rise sharply. Any enterprise that manufactures equipment in accordance with Japanese schematic diagrams or processes will encounter the above-mentioned problems. Previous content： On Several Current Generation Methods of Slightly Acidic Hypochlorous Acid Water (Part 1)   On Several Current Generation Methods of Slightly Acidic Hypochlorous Acid Water (Part 2)    

Original: Dong Xingwen, Chief Engineer of Yantai Fangxin Water Treatment Equipment Co., LTD Proofread by Liu Yan Date: October 2, 2020 The shortcomings, problems and innovations of various generation methods In addition to the first method, Yantai Fangxin also offers the other four types of micro-acidic hypochlorous acid water generators. As long as the customer needs us, we will accept any customized requirements. While adhering to the unchanged manufacturing of four types of micro-acidic hypochlorous acid water generators, Fangxin has made innovative changes to some specific implementation processes and methods. Even though domestic and foreign experts generally believe that the stability of the effective chlorine content in micro-acidic hypochlorous acid water is poor and that it is produced and used on the spot, Fangxin has broken through this. 1) Fangxin's zero innovation and zero breakthrough in the sodium hypochlorite solution acidification method This kind of equipment has a low manufacturing cost and there was a certain demand in the past few years. However, the author believes that this approach is unlikely to yield breakthrough technologies. It is mostly about drawing on some similar implementation technologies from different industries and optimizing the generation process. It was not until a gathering that the author learned that a peer could come up with a grand and intimidating name for "a liquid-liquid mixing process". This is truly a highly technical job, making one realize that innovation in words is also a manifestation of a company's strength. To quote a golden saying by Bai Yansong: The Chinese language can be repeatedly "reinvented". Is there any character you don't recognize? No. But when she recombined the Chinese characters that we are all very familiar with, she created the artistic conception that "everyone has in their hearts but no one can write about it".   2) Fang Xin's innovation and breakthrough in the ion-exchange membrane method for the chlor-alkali industry This kind of equipment is extremely expensive. If the cost of the tank is not reduced, the equipment of this type is basically in high demand but in short supply. Apart from foreign countries, there is basically no domestic demand. Ion-exchange membrane method  

Original: Dong Xingwen, Chief Engineer of Yantai Fangxin Water Treatment Equipment Co., LTD Proofread by Liu Yan Date: September 28, 2020 I. Preface This is a composition based on a given topic. The company said that due to the epidemic this year, slightly acidic hypochlorous acid water has become a hot topic in the field of disinfection and sterilization. Nowadays, there are a great many related online articles. You must create an original popular science article within three days and make it understandable to anyone. Over the years, I have only written a few simple PPTS to communicate with clients. To complete the task, I had no choice but to take out the PPT again and write this "three-no" article without any pictures, formulas or data. This article is divided into three parts: upper, middle and lower. It takes about 30 to 40 minutes to read the full text. From the author's perspective, there are three directions for writing articles about slightly acidic hypochlorous acid water. The first direction is to write about its application methods and processes in various industries. The second direction is to write about its characteristics, mechanisms, and effect comparisons in the field of disinfection and pest control. The third direction is to write about its generation method. The first two directions have a wide audience and are easy to spread. Unfortunately, the author's mastery of knowledge in these two directions is still at the student level, and he still has many doubts himself. I have no choice but to focus on the third one. I have been engaged in the research and development of water electrolysis for nearly 20 years. Starting from electrolyzing dilute hydrochloric acid to generate hypochlorous acid water, I have successively developed several types of equipment for generating slightly acidic hypochlorous acid, conducted experiments, tightened screws, and visited the site. It is relatively easy for me to write some personal experiences in this regard. Since it is a personal experience, it is inevitable to be subjective. Therefore, I would like to state as follows: This article mainly explains several existing methods, processes and problems for producing slightly acidic hypochlorous acid water on the market. The focus is on promoting the innovation and breakthroughs of Yantai Fangxin. Those who are not interested are not required to read. 2) The content of this article is taken from the explanations and the accompanying PPTS during our communication with clients over the years. Some technical secrets have been deleted. We sincerely hope that those with information can keep them confidential and not disclose them. 3) The ownership of this article belongs to Yantai Fangxin. If you forward or share, please send a complete version retaining this statement. If quoted or excerpted, please indicate