Electrical discharge ozone generator

Electric discharge ozone generator, 77 798 Electric-field-induced second harmonic generation (EFISH), 20 515 Electric field intensity, exponents of dimensions, 8 585t Electric field perturbations, 74 616 Electric fields... 

Figure 2-2 Working principle of the tubular Electrical Discharge Ozone Generator (EDOG).

In lab-scale electrical discharge ozone generators the mass flow rate of ozone produced (m(03)) mainly depends on the gas flow rate (Qa) and the power or the voltage applied... 

Figure 2-3 Characteristic dependency of the ozone gas concentration on the gas flow rate in an electric discharge ozone generator (from ASTeX Sorbios, 1996).

Water or waste water ozonation - regardless of the scale of equipment - is mostly performed in directly gassed systems, where the ozone containing gas is produced by an electrical discharge ozone generator and is introduced into the reactor by some type of gas diffuser. Since two phases, the gas and the liquid, are required for the oxidation reaction to proceed as it does, they are also called heterogeneous systems. 

At T= 20 °C the aqueous solubility of ozone is about one third of the gas-phase concentration seven times higher than that of oxygen However, we must consider that the gas does not contain pure ozone, but rather approximately 20 % wt O-, in 02 (corresponding to cG = 320.1 g nrf3 at STP, cf. Table B 1-5), which can be achieved with modern electrical discharge ozone generators at standard pressure. Thus, the equilibrium concentration of ozone in the liquid is usually less than cL = 108 g m ... 

Commercial production and utilization of ozone by silent electric discharge consists of five basic unit operations gas preparation, electrical power supply, ozone generation, contacting (ie, ozone dissolution in water), and destmction of ozone in contactor off-gases (Fig. 1). 

The most widely used gas-phase chemiluminescence reagent is ozone. Analytically useful chemiluminescence signals are obtained in the reactions of ozone with NO, SO, and olefins such as ethylene and isoprene, but many other compounds also chemiluminesce with ozone. Ozone is conveniently generated online at mixing ratios of =1-5% by electrical discharge of air or 02 at atmospheric pressure [14]. 

Ozonolysis. Ozone was generated from oxygen by silent electric discharge, and bubbled through the reaction mixtures from a capillary tip. The ozone concentration was monitored spectrophotometrically at 350 nm by the KI method as previously described (8). 

Table 2-3 Characteristic operating parameters of electrical discharge and electrolytic ozone generators.

FIGURE 14.10 Generator for preparing ozone. A stream of 02 gas flows through the ozonizer tube and is partially converted to 03 when an electric discharge passes through the gas. 

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