Ozone is used extensively in Laundries in western countries. By simply using Ozone you get a bounty of benefits! It saves time, power, labor and cost. It is not only environment friendly but actually helps to improve the quality of environment!
Wet and dry systems of Ozone are used for Laundry. Dry system is mainly used for bleaching denims. Wet system is used for day to day operation. We normally set a range of 1.5 to 3.0 ppm for standard operations.
Approximately half the electricity consumption used in the laundry is for heating water. The other half is used in drying the linen. Ozone is more stable and lasts longer in cold water. In other words, colder the water, the better it is. Ozone Laundry Systems can eliminate 90% or more of hot water usage.
Under normal laundry conditions, the ‘‘cleaning window’’ of a wash cycle is only during the detergent and bleach steps. This cleaning window is usually one third of the total wash cycle time. With AM Ozonics Ozone System, the entire wash cycle is the cleaning window. When your washer fills with water, in most cases it is cold water. This means that every time your washer fills (most wash cycles fill at least 5 times), it is getting a fresh dose of ozonated water. That means ‘‘cleaning window’’ is on for the entire cycle! By lengthening the cleaning window, we are able to shorten the entire cycle by as much as 20%. In other words, Ozone gives 20% faster wash cycles!
Ozone reduces wash cycle by cutting off the additional make up water added to removes chemical residue in washing water. Shorter wash cycle and less usage of water increases the savings and enhances laundry washing output. Ozone reduces water consumption by a minimum of 30% over traditional methods.
Ozone laundry lowers water retention. Less water in the linens going to the dryers means it takes less time to dry them. Ozone actually penetrates the linen fibres. This is evident in the thicker, fluffier towels that are dried after being ozonated. The ozone helps to release moisture in the dryers or on a flatwork ironer, thus creating much faster drying times as well. In most cases, drying time has decreased by 20%. This decrease also reduces energy consumption in the dryers by up to 20%.
Ozone is a clean gas made entirely of pure oxygen. High concentrations of dissolved ozone will lead to the creation of Hydroxyl Radicals or OH molecules at a pH as low as 8 for which only small amount of alkali is needed.
Traditional laundering methods require astronomically high pH of 11 for generation of OH radicals! Without using all the chemicals, ozone gives an equal or greater amount of cleaning power as with the traditional soup of caustic chemicals! Ozone eliminates necessity to store large amounts of hazardous chemicals. Since ozone does most of the cleaning work, big reservoirs of Chlorine, Alkali and Acid are no longer needed. Adopting ozone reduces total chemical costs by 50% or more.
A typical laundry produces wastewater that is high in BOD (biological oxygen demand – food for bacteria) high in COD (chemical oxygen demand) and low in DO (dissolved oxygen). This is to be expected with the nature of the soil and chemical contaminants found on dirty linen. The soil consists of body oils and other secretions, food and other organic waste, organic stains like blood and grass stains, etc. Chemicals found in a laundry’s wastewater include the strong alkali described above, hefty amount of chlorine bleach, lots of detergent, acid, fragrances, softeners, and more. All of this adds up to mean the wastewater coming from a typical laundry is not very nice. The high BOD, COD and low DO are all counter-productive to what they are trying to accomplish down at the local wastewater treatment plant. Ozone lowers BOD and COD of laundry wastewater. Any remaining ozone simply raises the DO (dissolved oxygen) content in the water.
Eliminating Chlorine and other harmful chemicals and reducing the amount of detergent used to process linen will greatly improve the air quality in and around the laundry facility. Eliminating the use of Chlorine means the elimination of huge amounts of VOC’s! No more acid and greatly reduced alkali means longer linen life. It also reduces amount of lint shed in the dryers. This reduces the amount of airborne particles coming from dryer vents which will greatly reduce the volume of particulates in the air. Particulates are a major source of pollution that pervades our environment today.
Labor is getting more expensive day by day. By shortening the wash cycle and dry cycle, the labor cost can be effectively reduced.