Barrel Sanitation with Ozone

It’s important to understand that barrel sanitation using ozone is not the same as barrel sterilization. The surface of barrels does not have a discrete surface, it is more like a 4-5mm sponge, often with blisters. The porosity of the barrels provides far too many nooks and crannies for ozone in any concentration and duration to completely eradicate all microbes. The ozone treatment of barrels is designed not to eliminate microbes, but instead to control them. This concept of microbial control is especially important when ozone is used to treat barrels with high populations of microbes, which can produce off-flavors or cause wine spoilage.
Barrel Sanitation with Ozone
Many wineries have implemented ozone as a part of their barrel-washing practices. Standard procedure for barrel washing varies from winery to winery, but it typically includes a high-pressure, hot water rinse, followed by a dissolved ozone water treatment. The concentration of ozone applied, as well as the contact reaction time in the barrels, depends on the quantity and nature of the contaminant. Larger quantities of microbes in contaminated barrels require longer treatments, but smaller doses may be required to handle sensitive materials. Typically, a 2.5 ppm ozone concentration for two minutes on healthy barrels, after a hot water flush, is sufficient. If the barrel is severely contaminated, a five-minute treatment may be required.
Bacteria Inactivation by Ozone

  • E. Coli 0.02-0.06 mg-min/L=CT (2-log) AWWA
  • Streptococcus faecalis 0.01-0.025 mg/min/L=CT (2-log) AWWA
  • Legionella pneumophila 0.3-1.1 mg-min/L=CT (2-log) AWWA
  • Total Coliform 0.19 mg-min/L=CT(6-log) LAAFP
  • HPC 0.19 mg-min/L=CT (3-log) LAAFP
Free Chlorine (pH 6 to 7) Chloramin Chlorine (pH 8 to 9) Dioxide (pH 6 to 7) Ozone (pH 6 to 7)
Giardia 122 2200 26.0 1.9
Virus 8 1988 33.4 1.2

Benefits of Using Ozone

  • Ozone offers higher sanitization quality, time, and energy savings.
  • Decreased chemical use by using natural ozone gas, which is produced safely.
  • Economical through sophisticated, yet easy-to-use integration.
  • Ozone generation and contact systems are the world’s most powerful cleaning processes.
  • Commercially available disinfectant. Ozone kills microbes up to 5000 times faster than weaker oxidizers like chlorine, but it decomposes naturally into oxygen unlike harsher agents with harmful disinfection by-products

Clean In Place (CIP) of Piping

The biggest threat to winemaking is contamination during the long production process from harvest to tank to barrel to final bottling. Clean-in-Place (CIP) involves cleaning and sanitizing pump systems, pipes, tanks, hoses, filters, and bottling lines. Using ozone in the CIP process saves time as well as costs. Dissolved ozone water is circulated through the piping systems and reacts with organic material.
Many modern ozone generators have controls built-in which receive signals from ozone sensors connected to the pipes or tanks. This allows machinery to be cleaned and sanitized easily and automatically.
Without ozone, CIP sanitation must be done in one of two ways. The first is by using chemicals, typically chlorine or iodine solutions, requiring multiple rinses afterward to remove noxious residues. The other option is by using heat, usually high-temperature water or steam, which is very expensive to produce and creates a danger for cellar employees. In contrast, ozone achieves CIP sanitation at a low cost, at ambient cellar temperatures, and without harsh chemical residues. Furthermore, hot water or steam causes the expansion and contraction of welds, one of the biggest causes of line degradation and repair. Heat can also bake on materials inside the lines, making them more difficult to clean. Since ozone is used in cold water, it avoids these and other issues caused by heat-based CIP sanitation.

Dissolved Ozone Water & Direct Ozone for Irrigation in Vineyards

The direct germicidal action of ozone is well-known against all types of microorganisms, such as fungi, bacteria, and viruses. Ozone fights against bacteria such as Pseudomonas, flavobacterium, streptococcus, legionella, etc. Ozone is especially effective against fungi and bacteria, which are the main cause of the degradation of vines. Ozone is very efficient against these microorganisms, which are able to propagate and reproduce in harsh and extreme conditions.
Ozone has a very powerful and strong oxidation capability and therefore destroys organic waste by oxidizing it. It is also very environmentally friendly, as it does not leave behind any harmful residues and reverts back to oxygen unlike pesticides, fertilizers, and additives used for growing crops. The use of dissolved ozone water for irrigation ensures that plants will grow more vigorously and will be healthier, and free from any kind of contagious diseases.

Bottle Washing in the Wine Industry

Most visited wineries have their own bottling lines, some only breed and bottle, selling wine to other wineries. The bottling line of any winery must perform the following tasks:

  • Wash and Sanitize bottles
  • Bottling
  • Capping
  • Capped
  • Labeling

They may also have other functions such as plasterboards, palletizing, plastic film wrapping, puckering, etc.
Bottling lines have recently been rapidly developed. They have gone from bottling manually or large automatic lines to small and fully automated lines. It is rare to find wineries bottling manually, even small productions use automatic bottling systems. In the production of table wine, bottlers often achieve 50,000 bottles/hour, which is logical since they are dedicated to large productions of wine.
Prior to packaging wine, you need to carefully wash the bottles. Perfect washing and disinfection is very important before the filling stage. Whether new or used, the bottles should be disinfected thoroughly. Often new bottles contain chemical impurities, dust, or crystal particles. Perfect washing and disinfecting of the bottles is an important step prior to filing. At this stage, when performed automatically, wash cycles consist of the following steps:

  • Rinse the bottles with water
  • Wash with a hot sodium, hydroxide solution
  • Rinse with hot water (70°C)
  • Rinse with water at room temperature (15-25°C)

Washers are provided with storage tanks containing wash solutions, supply valves to steam them, and nozzles for spraying pressurized bottles with such solutions. Rinse first to eliminate impurities. When washed with a solution of soda a good hot chemical cleaning and disinfection of the bottle is achieved.
The disinfection stage may be incorporated into the full cleaning cycle and be applied before washing with detergent and hot water (70-75°C). In other cases, the bottles are usually washed with solutions of 1.5-2% SO2 in which the microorganisms are destroyed. The washing process should last about 15-20 minutes.
Bottling involves filling the bottles to a specific capacity in accordance with the applicable regulations. This process leaves requires placing the cap and possibly a vacuum chamber that allows for some expansion. There are several methods of filling the bottles:

  • Filling by following the system of communicating vessels. The bottles are filled up to the same level as the wine is in the filling tank (storage wine tank). This system has the disadvantage of being slow but is very simple.
  • The filling is monitored by pistons or another method. This procedure is followed when you want to accurately determine the weight or volume of liquid to be bottled.
  • Filling with a vacuum. This method creates a vacuum in the bottle which forces fluid into the bottle to the target level
  • Filling with sterilization. In this method, bottling circuits occur, and the wine passes through a sterilizing filter before entering the bottle. During this procedure, hygienic operating conditions are maintained in an atmosphere of CO2 SO2. The SO2 has the disadvantage of corroding the materials containing it.
  • Isobaric Filling: Sparkling wines are filled using equal barometric pressures operating at high or low pressure.

Barrel Sanitation with Ozone – Source – Ozone Solutions


Founded in Cape Town, in January 2002, Wassertec has become the leader in ozone and ozone generation in Southern Africa.
From day one, our vision has been to design and manufacture the highest quality ozone generation systems primarily for the wine and bottled water industries. We believe that by taking care of the quality, the rest will take care of itself.
By collaborating with highly competent electrical engineers and industrial software developers, we have, over the years, created what we believe to be the best ozone systems currently available in their class.
From small beginnings, we have grown the company and product line to become the leading manufacturer of ozone equipment in South Africa. Our specialised Bright Blue systems set the standard for ozone in the bottling industry.

Ozone Generation Specialists

With installations in nine African countries and clients such as Coca-Cola, SAB, and Distell, Wassertec is perfectly positioned to become your partner in ozone.
We not only design and manufacture our Ozone generation systems to the highest quality and safety standards, but we also stock all components at our Cape Town offices – ensuring rapid replacement of spares and minimal downtime.
If you are looking for high-quality Ozone Generators, with backup and service to match, you’re in the right place. Welcome to Wassertec.