Ozone & Plastics
Ozone Applications are increasing in India. Numerous instances have been noticed that applications are decided without due considerations to the materials of construction of pipes , containers etc .We provide below some information on the use of different type of plastics and Ozone’s effect on them.
Two group of plastics are discussed here ; Plastics termed as Thermoplastic materials and other group of plastics are the Thermosetting Plastics. They find numerous use in Industries and each type of plastics are used for different purposes dependent on the physical & chemical properties of each.
The effects of ozone on each of these materials will depend totally on the configuration of the polymers that make up the plastics. Crossed linked plastics such as poly polypropylene, poly- ethylene , poly- vinyl chloride and silicone or fluorine combined plastics are sufficiently impervious to ozone to enable their use in direct contact.
Most of the packaged water plants all over the world use plastics in some form or the other and the knowledge of each of these will help understand the likely effects with the use of ozone.
From a careful study of different kind of plastics , some forms of polymers are readily attacked by ozone and are not recommended , there are other forms that are quite resistant and take a longer time for effects of ozone. and others attacked immediately and not recommended.
Since most of the packaged water manufacturers prefer residual ozone, and they invariably use PET Bottles, Poly Carbonate Jars, PP Filters, that are all polymer materials , the question of whether they are safe with ozone is frequently asked. The effects of ozone in the long run could unzip some of these polymers to form by- products , Even though they are all dose, concentration and time related , we should never take this risk
For example poly-carbonate has been shown to be very resistant to UV and like water is classified as an universal solvent. Ozone can also be classified as an universal reactant- the only question is how much does it react. Through practical experience, it is very insignificant. For that matter , Ozone is also supposed to be Corrosive to Stainless Steel .But the corrosion is concentration and time related and therefore Stainless steel is regarded safe with the use of Ozone. In fact many ordinary plastics that give out smell (the popular PVC tank) can also be held suspicious, more than ozone which imparts no flavor to the water. The action of ozone on plastics also depends on whether Ozone is used as a gas or solution.. For example Nylon appears to break down faster when in contact with ozone-air mixture than ozone solution
Some care that could be observed while using ozone would include:
- Do not use ozone before cartridge filtration in packaged water process
- Do not store fresh ozonated water in PVC containers ( use ploy carbonate instead)
- Use CPVC /SS pipes preferably if water is being used for drinking.
- Store freshly ozonated drinking water in SS containers instead
- For prospective ozone users check for ozone reactions on MOC of containers/pipes before you use them.
Many of the reported ozone reactions on materials are time concentration related and many of the toxic effects have never been proven .
10/10 would be our rating if Clients are asked to rate us
Most experienced– OTSIL is the most experienced Ozone Company in India
Technical Expertise -OTSIL is backed by combined technical expertise of over 35 years backed by over 1000 working Installations all over India
Do Not waste ozone – We don’t waste Ozone – World Class Engineering ensures correct ozone requirement
Safe Designs -We provide safe ozone designs and installations with time tested reliable accessories . We do not compromise on safety and do not undertake projects that compromise safety
Reliable Systems -Provide reliable systems that work 365 X 24X 7 . No break downs ISO 9001-15000 certified
Allows FAT during ozone testing – You are safe and know what system will be delivered at site
Documentations -Complete documentations are provided to substantiate designs and selection of accessories , including test certificates and , safety manuals and training
Indizone Installations would pass any International safety Audit
World Class Service -OTSIL have well trained service personnel for quick resolution of service requirements . Stationed at Chennai, Bangalore ,Mumbai , Hyderabad and in Assam we can mobilize service to all parts of country within quick time
Fair Practices -OTSIL follow the policy of Fair Industrial practices .Very transparent in whatever we do and no information is kept away from the client
Ozone is a gas . So is Nitrogen, oxygen , Carbon dioxide , helium, Argon .But what is the difference between ozone and the other gases ? Other gases are prepared by air separation and they all can be stored in cylinders as they are very stable gases. When you can store the gases , they can be measured , especially because they are in the pure form . So using them is easier and measurable .
What about ozone ? Ozone is the only gas that is synthesized . Ozone gas does not occur naturally unlike other gases . Ozone gas is very unstable , cannot be stored and hence need to be produced and utilized in situ . Also Unlike other gases , ozone gas is never pure and does not exist alone. It carries with it oxygen gas /other gases . Hence you can not measure ozone separately like other gases . Hence you measure concentration only and use this is determine the ozone weight.
Here is the catch. since measurement of concentration of ozone is possible only with expensive analyzers , the industry is faced with a problem that is the root cause of process failures . Users of large ozone systems do not want to pay a little more for the analyzer and end up loosing the whole . Unscrupulous manufacturers thrive .
Recently there was an issue faced by a CEPT of a tannery effluent , which had the most experienced member in leather technology , failing to observe these precautions. They purchased and installed 15 Kg ozone system from a Mumbai ozone manufacturer ( that too 15 numbers , 1 Kg system) and found out that each of the 1 Kg system is producing just 200 grams . This is a government funded project . A little bit of awareness could have saved crores of investment . The loss was only to the end user organization ( tax payers money) and they nearly concluded another large order to the same supplier until awareness was forced onto them .
Lesson to be learnt : Don’t adopt modular systems. If you want 15 Kg , go for a 15 kg system. Always ensure you buy an ozone analyzer along with the ozone system and demand process guarantees . Buy ozone only from companies who are technology based and who have history of good world wide references . Get ozone specialists evaluate specifications
A Large ozone Generator with an Ozone Analyzer ( yellow instrument)
If you still consider economy as the only criteria , than no one is to be blamed except you .
Blogging for ozone awareness – Contact OTSIL for consultations, DPR for ozone projects , Technical evaluations etc. It could save you lots of money 9840149184
Swimming pools were once a upon a time an essential part of high net worth individuals. Today the higher middle class income group have joined this club. One common aspect of these individuals is that they are busy and find very little time for recreations. Hence they develop recreation facilities in their homes. Swimming pool is one important recreation facility in the home. They also provide owners ways of maintaining health and an effective exercise that can replace Gym going and also walks and it comes right at their home
Swimming pools are expected to be clean and the water must be bacteria free. Water can be a dangerous source of spreading infections. Also chlorine that has been used to keep this water clean is also responsible for many side effects caused by swimming pools. Ozone has come to the rescue and has become an essential part of swimming pool water treatment. Ozone has to perform this role for the pool owner. The pool owner hopes that the equipments suggested by the pool builder perform. He wants bacteria free water
Pool owner’s problem: He does not know if his water is bacteria free. Also getting the water tested regularly could be an issue. All he can measure is residual chlorine and hope the level he maintains provides him with clean water. But we all know residual chlorine achievement does not guarantee bacteria free water. Chlorine may be measured and we measure only residual total chlorine and not active chlorine and it is this active chlorine is important. These are reasons why an ozone treatment provides a solution. Ozone with this residual chlorine could solve his problem
A correctly designed ozone system can provide this guarantee as it is far more powerful than chlorine. Dose required is small and contact time required only in seconds. So maintaining a small residual chlorine level with ozonation will almost guarantee the pool owner a safe pool
What is the Pool owner’s problem today? He buys an ozone system and expects it performs and keep his pool safe. However in today’s Scenario, he is not sure if the ozone system is working and performing. He is not sure if the ozone system is delivering the correct quantity of ozone. He would not even know if his ozone system is working or not until one fine day he finds that his pool is breeding pathogens. In most cases pool owners find that his ozone system works only for a few months and the rest of the months he is unaware.
We are sure many pool builders face these issues but are helpless as they have to face the wrath of the pool owner
Role of a pool builder: A builder is an important link between the pool owner and the ozone supplier. He has an important role to play to ensure pool safety .He depends on correct information from the ozone supplier. He needs an insurance that the ozone system is producing the ozone it is required to produce and that an indication that the ozone is working.
Ozone measurement: ozone measuring instruments are expensive and can cost half the cost of a pool filtration system. This is the only reason why the pool owner feels so frustrated after having purchased an ozone system. He is only hoping all the time .
How OTSIL will help your swimming pool clients: OTSIL R & D development provides an option for the pool client to know the Health of the ozone system. The state of Art EOPI technology comes at very small incremental price to the client. An EOPI will indicate the ozone production, it will help diagnose ozone system faults, it will indicate if the ozone system is working or not , all through a PLC display system . There are no probes or expensive analyzers. This is the best that can happen to the ozone industry
Pool owners , Pool builders , Water treatment consultants contact us for Safe Ozonation 9840149184 .
Designing a Safe vent ozone distructor
Ozone distructors have compromised design if they
1) are not designed for the flow of water flow and capacity of the contact tank
2) If catalysts are used and they are not sized appropriately. They need sufficient surface area , sufficient particle size and sufficient air velocity to work efficiently. A manufacturer of these catalyst will tell you all about this
3) they do not incorporate a moisture separator if required by design of contact tank
4) They do not take care of temperature control
Vent ozone distructors for SS tanks: These are for smaller applications where the capacity of the ozone contact tanks vary from 3 KL to 30 KL total capacity. It is normal to incorporate in the design of these contact tanks off gas vent that facilitates tank breathing during filling and emptying. The size of these vents is in accordance to the capacity of the contact tank. the contact tanks vents have to be correctly designed , else there could be an implosion of the contact tank .
Vent ozone distructors are of 2 types .The thermal ozone distructors utilize heat to destroy ozone. The temperature that has to be reached for 100% ozone destruction within a few seconds would be as high as above 250-350 Deg cel . This is very challenging as the surface of the distructor gets extremely hot and effective control of the temperature rise assumes importance. The power requirement will be sometimes more than the power required for the ozone production. Thermal type vent distructors are not very common for small applications and are very difficult to source. Few reputed companies manufacture larger thermal type but they are very expensive and high on operation costs
The catalytic ozone distructors are most common and very reliable if designed well
Note the Ozone distructor mounted on a skid on the left side of the picture
They are easy to install, operate and maintain. operate and maintain. They contain specialized catalyst that have proven record of destroying ozone . These catalyst lasts a long time ( 3-4 years) if the ozone distructors are designed well.
Catalysts used in vent ozone distructors have to be used carefully. They are poisonous and so the design and the installation of the vent ozone distructor should prevent this catalyst of falling into the tank when they crumble. Moisture from the ozone tank can clog these catalysts, and prevent tank breathing, causing implosion of ozone contact tanks. The ozone distructor design must prevent crumbling and clogging of the catalyst, enable free tank breathing.
These are small steps we at OTSIL take to make ozone use safer in India . Contact us for well designed ozone distructors . Be safe .
Using the correct catalysts in a Vent Ozone Distructor ( VOD)
VOD,s are deployed for destroying residual ozone from the vents of Ozone contact tanks . VODs are 2 types , one being Thermal and the other Catalytic. Choosing the correct catalysts for the catalytic type is utmost important. Many Ozone distructors available in India are locally made with no consideration of design. Most of them have activated carbon as catalysts .
This is out of ignorance. Activated carbon are used to strip residual ozone from water and it is very effective here. But when used as catalysts for VODs they can be very dangerous. Firstly they genearte heat during adsorption . Then it has been noted that some Carbon Monoxide is formed as a side reaction and this is not safe . So when ever you opt for VODs , check out on the catalysts . Request MSD of the catalysts . . Be safe . Use ozone safely . Contact OTSIL for safe ozone distructors . We guarantee 100% vent ozone destruction .
We believe in safety first . We believe in making ozone use safer . We do not believe in short cut and we value life
Our latest SS ozone skid for the process Industry incorporate all safety measures to prevent ozone leaks and also destroy 100% ozone from the contact tank vent .
More still in the fully automated skid clients can get to know how much ozone is being generated by the system. Protection against process failures
Our guarantees will include ozone production , ozone leakages during mass transfer , 100% vent ozone destruction , 100% ozone residual destruction and above all guarantees for pathogen free water including gram negative organisms Process ozonation can never get better !!
MYTH OF CHEMICAL FREE SWIMMING POOL TREATMENT
Many ozone manufacturers come up with very exciting proposals for swimming pool water treatment. Chemical free treatment concept is very exciting to hear and tempting to pool owners. The main issue for most pool owners is the toxicity associated with the use of chlorine as a disinfectant in swimming pools. What is this chemical free treatment in swimming pool these ozone manufacturers are talking about? Is it ever possible?
The answer is always a big NO. Why? The reason is that swimming pool water is often contaminated with numerous bacteria, virus , body oils, bird droppings, pseudomonas from landscaping, legionella, Giardia and many more . Most of these contaminants are never addressed in pool water treatment. Most of them have serious consequences to pool users health. Hence any pool water treatment regime has to be comprehensive to address all of them. No compromise here
Chemical free treatment; It means there is no chlorine usage, no usage of chemicals for coagulation, no usage of anti alage chemicals, no usage of acids.
Can ozone replace all of them?
The answer again is No. Ozone is not a magical wand to replace all these chemicals. Many of these chemicals play their role and a pool treatment has to be comprehensive, covering the entire spectrum of contaminants in the pool. Ozone will only replace chlorine as the primary disinfection and there is no alternative for the presence residual disinfectant in the pool and because no ozone residual is allowed in the pool (safety issues and all residual ozone must be removed before water enters the pool) , residual chlorine is the only viable alternative.
Some ozone manufacturers do recommend a small ozone residual of 0.05-0.01 ppm in the water that can totally get away from chlorine addition. For this you need to measure and control ozone residual in the water and require expensive measuring equipment and strict controls . Not always accepted by the pool owner , especially in India . So you would not want to take this risk . Also international standards quantify residual ozone on the surface of the pool water , a difficult measuring aspect and co relating residual ozone in the pool to the expected residual ozone at the surface of water is always going to be in accurate
Chlorine is the main chemical that is the cause of all the evolution of the so called chemical free treatment . But chlorine can never be replaced. It is the only chemical that can protect the water in the pool when contaminants are introduced. Neither UV or ozone or any other chemical can replace chlorine. But chlorine can be made safe with the use of ozone . Use of ozone ensures chlorine toxicity is reduced or removed totally
What about claims of using ozone and UV together? This is known as AOP (advanced oxidation process) and used only in indoor pools. Indoor pools have reduced contaminants introduced into the pool and could be an ideal candidate for a CHLORINE FREE pool (not Chemical free pool), since we still need to use other chemicals for flocculation, pH control etc . If the Indoor pool has a large bather load , often residual chlorine is also used along with Ozone . Moreover the UV lamps ideal for combination with ozone is a medium pressure lamp (not used commonly in India except for certain applications) . Use of ozone alone does not mean chemical free treatment.
Claims that chlorine free pools are following German and Australian standards is totally wrong as both Australian and German standards require complete removal of ozone before it enters the pool and maintaining residual chlorine at 0.5 ppm. Few unsuspecting clients in India have fallen in prey to these chlorine free concepts which is just not safe for the swimmers. It is suggested to any client that he verifies these standards before accepting any such proposal from ozone manufactures to ensure that what he gets is totally safe for his and his family’s health
So next time when an ozone manufacture talks to you of chemical free treatment ask these questions and you may not get the correct answer. Ozone with residual chlorine alone is a better and safer combination for pool water treatment
Recently I was called to a fairly large company to check on an ozone system installed for water treatment . They were not getting results . They were sold a 500 grams ozone system by an Indian manufacturer . against our will be were coaxed to check the ozone production and found that the unit was generating only 70 grams . This was confirmed also by the actual power consumption of the unit . There was nothing the buyer could do at this stage as the manufacture was giving ll sorts of excuses for non performances and shifting the blame to the engineering of the contact tanks, water quality and what not.
these situations do not happen in developed countries and it is high time we became sensitive to these tall claims of few irresponsible ozone manufactures .Buyers , consultants must exercise their rights enforcing performance as claimed/guaranteed
Today OTSIL has replaced more than 30 units of other ozone manufacturers within the last 2 years – All of them within warranty period. . We do not actually like it and are frustrated ourselves . Will it Change ?