Technical Discussion: Exploring Issues in Circulating Water Treatment

Disadvantages of chemical treatment: It is difficult to achieve an accurate dosage – either too much or too little of the chemical is used. It’s hard to obtain the best removal results. Skilled personnel are required to add and mix the chemicals. The chemicals need to be added continuously, which is cumbersome. Unreacted chemicals can cause corrosion and algae problems. The addition of chemicals increases conductivity, resulting in a lower concentration factor and significant water waste. In some countries or regions, the use of biocides is restricted (for example, in Japan). It is not possible to effectively control deposits of chemicals, scale, and bacteria beneath biological membranes. It is also not environmentally friendly – continuous use does not address the root causes of the problem. Advantages: Rapid results. I hope everyone will provide more information on this topic

The last edit to this post was made by hesonchang214 on 2011-5-24 at 16:01. Features of RO reverse osmosis equipment: Since it does not require heating, has low energy consumption, operates in a continuous and stable manner, is compact in size, easy to operate, highly adaptable, and does not cause environmental pollution, it is gradually replacing traditional ion exchange processes. It features advanced manufacturing processes, reliable product quality, strong scalability, a rational design that results in low space consumption, a good balance between water usage and product lifespan, low energy consumption, fully automatic operation, and simple operation and maintenance. Application areas of RO reverse osmosis equipment: ☆ Production of sterile, pyrogen-free purified water in the pharmaceutical and medicine industries ； ☆ Ultra-pure water for the electronics and power industries ； ☆ Water for biopharmaceutical use ； ☆ Water for use in the chemical and cosmetic industry ； ☆ Brackish water, seawater desalination ； ☆ Solution distribution and part rinsing in the electroplating and coating industry ； ☆ Cleaning, distribution, and cooling water for use in the industries of precision machinery, special materials, optoelectronic materials, and quartz products ； ☆ Drinking purified water, water for food and beverages. RO reverse osmosis technology is not suitable for long-term human consumption; its main applications are in the production of water for use in space, purified water, distilled water, etc ； Alcohol production and water for dilution ； Preliminary preparation of water for use in industries such as pharmaceuticals and electronics ； Concentration, separation, purification, and water preparation in chemical processing processes ； Seawater and brackish water desalination ； Water and wastewater treatment for industries such as papermaking, electroplating, and printing and dyeing. It is clear that it is an industrial water treatment process; in other words, there are doubts regarding the health implications of drinking such water over the long term! Water produced through RO technology is pure water, and pure water also has one more significant feature ； It is also a problem that goes unnoticed, as its pH level is acidic. The pH level of bodily fluids in the human body ranges from 7.35 to 7.45; therefore, the water we consume should be slightly alkaline ； Moreover, due to modern people’s diet patterns and changes in work and lifestyle, it is already easy to develop an acidic body condition; therefore, people need alkaline water even more. Consuming pure water over the long term will only contribute to making a person’s body more acidic. Hidehiro Ogihara, a world-renowned medical doctor and Japanese medical expert, believes that the acidification of bodily fluids is the root cause of all diseases.

Thank you for the moderator’s guidance. Is the amount of waste discharged large? What’s the price of the membranes?

There are currently many methods for circulating water treatment, which are also classified in great detail. Generally speaking, it needs to be divided into three stages: The first stage is pretreatment, which primarily involves using physical methods to remove impurities, achieved through the use of filters, filter tanks, and filtration membranes. In the second stage, colloidal and dissolved organic pollutants in the wastewater (such as BOD and COD) are primarily removed. The third stage is advanced treatment: the main methods include biological nitrogen and phosphorus removal, coagulation and sedimentation, sand filtration, activated carbon adsorption, ion exchange, and electrodialysis. The above are some of my personal summaries; I’m not sure if they’re complete

Reply to 5# kouxj: I’ve taken a look at your ideas, and it seems that you’re focusing more on wastewater treatment processes for domestic use

Happy Children’s Day! Haha, sorry for coming to check your post only now. For circulating water treatment, chemical treatment is the most commonly used method at present. There’s no other option – many manufacturers demand quick results, so this is the only way. There are only a few types of chemicals, and many water treatment companies are capable of using them; when recommending them to clients, these chemicals are the ones that are highlighted. To remove suspended solids from the circulating water, installing a set of side filtration equipment will ensure its proper operation.

Hehe, I worked on a project yesterday. The total hardness of the water used for replenishment was 781 ppm; it was groundwater that was used for this purpose, with 80 tons of water being added each day. In terms of calcium carbonate, that amounts to about 58 KG added per day. We aim to demonstrate the value of our technology by reducing the total hardness of the water and keeping the condensers in a nearly scale-free state.

Total hardness over 780 ppm? What about the calcium hardness, and the alkalinity? What are the flow rate and temperature difference? If the system is small, with an evaporation rate of only a few cubic meters, and the concentration ratio is below 1.5, it is also possible to achieve this using chemical methods by adding 80 cubic meters of water per day. It would be more convincing if you could present the data you have processed. When electromagnetic descaling was first introduced, its advantages were heavily promoted, with claims that it could achieve zero emissions; yet it turned out that electromagnetic descaling is only suitable for very limited applications. Therefore, practice is the sole criterion for testing truth. The difference between China and developed countries is that developed countries only introduce their products after they have been proven effective in practice, while in China, those products are promoted at the theoretical stage first, with no consideration given to the actual outcomes.

In fact, the adoption of a new technology relies not only on theoretical breakthroughs but also on advancements in its application. Especially when applied to large cooling circulating water systems, such as those in the petrochemical and large fertilizer industries, these systems are generally stable, but the water quality is complex and leaks may occur; it would be useful to summarize the experiences from such applications. The adoption of new technologies or equipment certainly requires a process; it involves not only the competition between new technologies and existing ones, but also the competition among those who possess these technologies. No matter what the technology is, it has its advantages as well as its disadvantages; it can’t be perfect, otherwise users wouldn’t have any choices.

In fact, the adoption of a new technology relies not only on theoretical breakthroughs but also on advancements in its application. Especially when applied to large cooling circulating water systems, such as those in the petrochemical and large fertilizer industries, these systems are generally stable, but the water quality is complex and leaks may occur; it would be useful to summarize the experiences from such applications. The adoption of new technologies or equipment certainly requires a process; it involves not only the competition between new technologies and existing ones, but also the competition among those who possess these technologies. No matter what the technology is, it has its advantages as well as its disadvantages; it can’t be perfect, otherwise users wouldn’t have any choices.