Industrial Wastewater Treatment
Wastewater treatment systems with Ozone reactor
For Wastewater treatment with Ozone
Features and operating principle
The main applications of ozonization are targeted to disinfection treatments, microflocculation for the removal of suspended solids, oxidation of organic compounds, deodorization and sludge treatment. In wastewater treatment with ozone, the main advantages of using this gas are due to its strong oxidant power, the non-production of sludge or concentrates, the ability to degrade pollutants, the absence of secondary pollution, the ability to improve the general characteristics of water by increasing its biodegradability, the reversal of the salinity of the treated water, the possibility of obtaining also a disinfected effluent (in treatments aimed at the oxidation of organic substances), the ability to avoid corrosive and fermentative phenomena thanks to the strong disinfecting and oxygenating action, dosing flexibility and simplicity, which minimise operating costs and operational control.
Ozone benefits:
- strong oxidant power;
- does not produce sludge or concentrates;
- degrades pollutants, without transferring pollution to other stages;
- It does not cause secondary pollution; in fact, the ozone, when reacted, degrades to molecular oxygen and leaves no harmful residues;
- does not add additional salinity to the water to be treated;
- the oxygen not converted into ozone, can be recovered and used in other stages of purification treatment;
- After ozone treatment, the waste is already disinfected, thus avoiding the use of chlorine compounds and therefore the formation of toxic organic chlorinated by-products;
- the strong disinfection and oxygenation prevents corrosive and fermentative phenomena causing bad odours;
- has a great flexibility of dosage and simplicity of plant, which minimize the costs of management and operational control;
- improves the general characteristics of the water and increases the biodegradability of the waste water;
- The cost/benefit ratio of ozone is far superior to other disinfection systems.
Today, ozone is mainly used in the pre-ozonation of drinking water, in the removal of colour, surfactants and residual CoD from industrial waste, in the disinfection of pharmaceutical water, in the industrial or agricultural re-use of treated water.
Product Description
The Ozone reactor waste water treatment system "Edil-O3" produced by EDIL IMPIANTI 2 S.r.l. must be composed of: ozone generator, ozone suction venturi system or pressure pump, 13-level contact coil to allow the correct reaction, particle disruptor system with active carbon filling made of VTR/ painted steel, diaphragm solenoid valves, control unit and independent compressor, electric pump type horizontal monobloc steel for supply and recirculation reactor plant, structure of containment plant made of painted steel complete with tamponatura/ insulation, n.2 door openings for access and proper maintenance, n.2 windows to vasistas for correct internal lighting, n.1 air conditioning system with two-output internal inverter, for cooling/ heating, local control panel ozone reactor and utilities, external nose complete with residual ozone destroyer in the atmosphere, proportional type diaphragm metering pump for ph control and its probe.
Operating principle
The chemical characteristics of the effluent affect the absorbed dose of ozone, as different compounds in the wastewater can compete with the disinfecting activity of ozone. In fact, the competition between these chemical reactions is not harmful to the discharged water as these reactions make the compounds less hazardous and stable, thus greatly improving the final discharge.
The following are the major pollutants that are usually found in industrial discharges: Iron and Manganese, Sulphide ions, Cyanide Ions, Nitrite Ions.
It is clear that these listed represent only a small part of those that can actually be found and treated with excellent results through ozone treatment.
With organic compounds, ozone is highly reactive, even with very stable ones such as humic and fulvic acids, responsible for the formation of organohalogen compounds, but also more stable molecules such as phenols, benzene, pesticides (atrazine), but ozone also has an organic fraction reduction (COD) activity at the point of discharge.
Generally, the reactivity of Ozone is towards those organic compounds that also contain double bonds, in this case the molecules are broken down into simpler and more biodegradable molecules.
There is also a considerable activity of removal of surfactants, organic molecules, which can come from both civil and industrial discharges. mainly from the washing operations of the textile industry, but also from substances that produce unpleasant colours of the water coming out.
The investment costs for the implementation of ozonization, when compared to plants for chlorine dosage, are higher. In reality this comparison is not very expressive, because the two disinfectants have different purification chemistry and maintenance costs, over time, in favor of ozone.
If used for the decomposition of hydrocarbon-containing sewage, formation of by-products such as aldehydes, and ketones with potential toxicity. Ozone has no effect on the ammonia contained in water, unlike chlorine which forms chloramines, highly toxic substances.