Effective water disinfection for
maximised water reuse
The requirements on water treatment in greenhouses are becoming tougher all over the world. The EU is committed to set high standards for the reuse of wastewater in all greenhouses in the EU. The aim is to reduce the need for pesticides, increase the use of rain water, and maximize the reuse of irrigation water – in the most sustainable way possible. Could the water volumes not absorbed by the plants be treated and reused, the gains would be huge.
Our message is simple. If this is what you are looking for, ozone technology must be considered. An ozone system treats and disinfects large volumes of contaminated water fast, effective and at low cost. Other benefits are fully automatic operation, minimal space requirements (2-3 sqm), free-of-cost raw material (ambient air) and no need what-so-ever for transport, storage and handling. Our ozone technology is since long used for water treatment and CIP applications in breweries, wastewater treatment plants, fish farms, zoos, pharma industry, water bottling, aquaculture, food and hygiene, dairies and the off-shore and textile industry.
- Excess water
- Non-absorbed irrigation water
- Municipal/city supply water
- Local supply water
- Collected rainwater before use
- Warehouses/storage areas to eliminate mold
Ozonated water can be used in overhead sprinkler systems to reduce non-beneficial bacteria and microorganisms on the plants.
BLOMSTERBODA, TULIP FARM
Our turn-key RENA Vivo water treatment system enables water reuse at Sweden’s largest hydroponic greenhouse. Our solution treats COD, sanitizes circulating water and improves nutrient management at the plant.
LJUSGÅRDA, ARUGULA PLANTATION
Ljusgårda solved mildew growth on the arugula plantation by effective ozonation with our industrial ozone air treatment system.
HORTINET OU, CUCUMBER CULTIVATION
Estonian cucumber hydroponic greenhouse solved wastewater effluent limits by installing our RENA Vivo ozone system as central part of a water reuse implementation project.
SMALL FOOTPRINT, AUTOMATIC OPERATION
AND FREE-OF-CHARGE RAW MATERIAL
An ozone system is easy to handle. Once the initial settings are made, the operation is automatic. Ozone is continuously produced from the ambient air, via an oxygen generator, and led into the collection tank. Supervision from time to time is sufficient.
A typical cost for an installation of a RENA system solution in a greenhouse is 10,000 - 50,000 euros.
THE INSTALLATION AT BLOMSTERBODA TULIP FARM
be subject to microbial contamination. It is also vital to be able to retain the nutrient content. Ozone is an attractive method thanks to its highly potent disinfection capacity and its residue-free characteristics. It is also an excellent approach to treating wastewater containing elevated levels of organic COD and pesticide residues.
GREENHOUSE WATER REUSE WITH OZONE
As the non-absorbed water volumes are drained from
The sketch shows a standard installation of a RENA system in a greenhouse. No major rebuilding needed. The on-site produced ozone is continuously supplied to the collection tank.
NEW LAWS AND REGULATIONS PUSHING PROGRESS
The greenhouse industry needs to be greener and new laws and guidelines are now being introduced and enforced. In short, the new regulations comprise:
- Reuse of water in hydroponic greenhouses
- Elimination of pesticides in the greenhouse wastewater
- COD (Chemical Oxygen Demand) treatment in the wastewater
Read more here / download.
WATER USE BY SECTOR IN THE EU (2014)
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99% ELIMINATION OF PATHOGENS
A properly designed ozone system will eliminate and inactivate bacteria, viruses, fungi, algae, protozoa and odors. Nutrients are not affected.
A BIT LESS GREENHOUSE EFFECT
It’s not easy to make a full analysis of a water treatment method’s environmental impact. But ozone has some advantages hard not to agree on. There is no need to manufacture, produce and transport any raw material or chemicals (nor to order, handle and administrate them). The production of ozone is automatic and uses the oxygen in the ambient air as free-of-cost raw material. The direct operating costs are the power consumed by the ozone generating system and the closed cooling system.
OZONE - THE KEY ADVANTAGES
- Strong disinfectant. Ozone’s oxidizing potential is high. It ranks among the top four oxidants. In practise, it’s the second strongest after hydroxyl radicals.
- Fast reduction of COD and BOD. The ozone treatment of unwanted organic residues effectively reduces the organic COD and BOD loads of the water.
- Unaffected nutrients. Nutrients such as ammonium, phosphate, sulphur and potassium remain unaffected.
- Low footprint. Our RENA Vivo systems are designed to fit onto a standard EU-pallet.
- Low energy input. Required power input is normally 1-3 kW.
WHAT DOES DISINFECT MEAN?
Disinfect is to cleanse so as to destroy or prevent the growth of disease carrying microorganisms. Therefor a disinfectant is an agent, such as heat, irradiation or chemical that disinfects by destroying, neutralizing or inhibiting the growth of disease-carrying microorganisms.
“The minimum level of effectiveness in a modern-day disinfectant is 100 percent kill of 6 log10 of an organism”
USE OZONE FOR FAST DISINFECTION OF LARGE
VOLUMES OF CONTAMINATED PROCESS WATER
Today, ozone is a preferred choice for fast disinfection of large volumes of contaminated water.
One of many trends that shows this, is the increasing use of ozone to treat pharmaceutical residues at
methods are required to keep product spoilage, diseases and bacteria at bay. Common methods are organic pesticides, heat, hydrogen peroxide, hypochlorite, UV, and ozone.
Many of these methods and technologies may cause secondary problems and environmental
COMPARISON OF WATER TREATMENT TECHNIQUES
|Effectivity||Good for water reuse||-||-||Good for pest control||Very high||-|
|EHS* issue||-||Potential issue||Potential issue||Yes||-||-|
*EHS - Environment, health and safety regulations