Seeking solutions to issues related to circulating cooling water

The answers to the above questions can actually be found by referring to relevant books on water treatment: 1. It is related to the formulation and environmental protection requirements; low-phosphorus or phosphorus-free formulations are recommended； High-phosphorus formulations do not meet the current environmental protection requirements ； 2. The indoor evaluation test for pre-coating agents can use scale inhibition tests (a method we have used before), but it is not necessarily accurate ； 3. Can the make-up water for circulating cooling water be used if it has the same quality as the initial circulating water?       Reintroduce the treated wastewater?       In that case, it is recommended to adopt reclaimed water reuse for treatment. 4. Corrosion inhibition and scale prevention should meet the requirements of the 2007 edition of the Design Code for Industrial Circulating Cooling Water.      A few simple thoughts~~    

Thank you for your replies! I’m sorry, but I’ve been working on oil field water injection tasks in the past; this time, I’m a bit confused about handling circulating water. I can’t find any relevant methods for evaluating many of the chemicals used. Could you tell me your methods for such evaluations? Methods for scale and corrosion inhibitors have been found, and several rounds of testing have been conducted. However, no relevant method has been identified for the copper sulfate drop test related to pre-coating agents, nor any standards have been found. Additionally, I would like to ask whether there are chlorine-free bactericidal and algaecidal agents available for use in circulating water Thank you!

Diazonium salts can be used for sterilization and algicidal purposes

Replying to the original poster: I also don’t have any relevant methods or standards for the copper sulfate drip test used with pre-coating agents. However, this method is employed in the water treatment industry to assess the effectiveness of pre-coating, and it is also recommended by manufacturers. I would be extremely grateful if any fellow sea traveler could provide it. Chlorine-free formulations of biocidal algaecides can use non-oxidizing biocides and bromine-based biocides.

Thank you so much for giving me the answer to this question! But it would be even better if someone could help me find the experimental methods. The literature I’ve found only provides brief introductions, and there seem to be some errors in the actual procedures. If anyone has detailed instructions for these two methods, please share them with me. Thank you!

I seek answers to the following questions related to circulating cooling water! I would appreciate the guidance of all experts! Thank you! Hehe! 1 Are there any restrictions on the total phosphorus content in circulating cooling water? 2 What method should be used for indoor evaluation tests of pre-film agents for circulating cooling water? 3 Can make-up water for circulating cooling water be used if it has the same quality as the initial circulating water? If it can’t be used, is there a solution? (With limited groundwater resources) What level is generally required for corrosion inhibitors and scale inhibitors in circulating cooling water to be considered satisfactory? I earnestly request expert guidance on the above issues! Thank you! When dealing with circulating water treatment for the first time, there are many things I don’t know how to approach! Hehe! Answer: The total phosphorus level in circulating water depends mainly on the enforcement efforts of the local environmental protection agency and the standards set by the chemical suppliers; if the emission restrictions are strict, then the levels shall be set according to those specified. 2. The methods for testing the effectiveness of pre-coating agents can be found in the works of Long Heyun and others; you can look them up on your own. 3、Isn’t circulating water used for hydration meant to prevent waste discharge? Be careful then: such a system results in zero wastewater discharge, so it is necessary to reduce alkalinity to prevent scaling, use side filtration to remove turbidity, and add corrosion inhibitors to reduce corrosion. It is best to apply the fungicide continuously; change \"fungicidal\" to \"bacteriostatic\". 4. The appropriate level of effectiveness achieved by corrosion inhibitors and scale inhibitors is a rather vague concept; the key factor is the amount added ； With proper maintenance, a Shari can also be driven to Hainan ； If not properly maintained, a Mercedes can also break down on the road. The key is to be aware of the dosage; it’s okay if the effect isn’t good – just use more.

There are generally no requirements regarding total phosphorus in circulating water, but the level of positive phosphorus should not be too high. Nowadays, organic phosphonate formulations are mostly used; some systems can also employ other substances, but it is necessary to ensure that scaling does not occur, which depends on the capabilities of the water treatment manufacturer. As for the pre-coating agent, it’s quite simple: copper sulfate is dropped onto carbon steel specimens that have been pre-coated, and if no red precipitation occurs within 7 seconds, then the result is satisfactory. The longer this time period, the better the quality of the coating. It is also visible to the naked eye that the blue membranes are of better quality, while the colored membranes are slightly inferior; they can be used for moisture retention, and that is precisely the purpose of water treatment. It is necessary to consider the capabilities of the manufacturer. For scale inhibition, the corrosion rate should be taken into account. The information provided by the friends above covers these aspects. It is not necessary to go into detail here on the method of using test pieces made of the same material as that of the system (which are available on the market). To assess scale inhibition, experiments can be conducted to determine the scale inhibition rate, or heat exchangers can be monitored. There’s too much to say; let’s take our time