CN1847168A - Evaluation and reactor for ozone oxidation to eliminate organic matter from water - Google Patents

Abstract

The present invention relates to evaluation method and reactor for ozone oxidation to eliminate organic matter from water. The reaction of organic matter in natural water and ozone is complicated, and the dynamic research of target organic matter elimination is difficult. The present invention provides evaluation method and reactor capable of controlling the ozone concentration and pH value of the reaction solution and has reduced reaction process variables. The pressure inside the reactor may be controlled by means of the cooperation of pressure gauge and the solenoid valve so as to simulate the effect of water pressure on reaction in practical treating process. By means of the method and reactor of the present invention, simplified dynamic equation of reaction between ozone and target organic matter may be established for directing and optimizing the practical treating process.

Description

A kind of appraisal procedure and reactor that is used for ozone oxidation removal water body organism

The present invention relates to a kind of appraisal procedure and reactor that ozone oxidation is removed water body organism that be used for.

Ozone can be used for many aspects such as the oxidation removal of inorganicss such as drinking water disinfection, decolouring, iron and manganese, the synthesis of organic substance of degrading as a kind of strong oxidizer.In recent years, people to sterilizing agent and disinfection byproduct (DBP) particularly the management of chloridized by product formulated severeer standard, impelled more water factory to consider ozone sterilizing agent and advanced treatment gordian technique as an alternative.In addition, body eutrophication causes algae excessive propagation, the meta-bolites of consequent 2-methyl isocamphol (MIB) and native smelly element algae such as (geosmin) makes water body produce the bad-smell problem of native musty, and conventional water technology (coagulation, chlorine disinfectant and sand filtration) is invalid substantially for the removal of MIB and geosmin.And ozone oxidation has removal effect preferably to MIB and geosmin.Above-mentioned all factors impel ozonize technology will have more applications in water factory.

In natural water body, exist two types ozone oxidation reaction: by the direct oxidation reaction of ozone molecule and the indirect oxidation reaction of ozone self-decomposition generation hydroxyl radical free radical.Organism and ozone reaction process complexity, the kinetics of research organic matter degradation and then the removal of assessment objective thing be difficulty very.Current relevant researchist generally adopts static state experiment in batches to study very roughly, can not remove target compound and carry out the rational and effective assessment.

The objective of the invention is in homemade reactor the pressure in concentration, pH value and the reactor of ozone in the control solution, set up the ozone oxidation of simplifying and remove the organic kinetics evaluation method of target, be used for instructing and optimize ozone process the removal effect of target compound in actual water body.

Structure of reactor of the present invention as shown in drawings, the ozone that the ozonizer of adjustable operating voltage produces and the mixed gas of oxygen, be uniformly distributed in the reactor 4 by titanium porous air distribution plate 3 (aperture 10 μ m) through inlet pipe 1, the tolerance that enters reactor is by intake valve 2 controls.Pressure in the reactor is by tensimeter 7 and magnetic valve 8 controls, and reacted tail gas enters device for absorbing tail gas through vapor pipe 9.When the concentration in the aqueous solution of ozone in the reactor reaches the desired concn value, use microsyringe to add target compound at injection port 5 (by a tetrafluoroethylene pad sealing), in the concentration of thief hole 6 timing sampling evaluating objects things.

The main body of this reactor is that internal diameter is 110mm, the stainless steel column of high 280mm, and titanium porous air distribution plate is fixed on the bottom of reactor.Ozone is broken into tiny bubble by the porous air distribution plate, so that fully contact with organism in the water, more effectively finishes ozone oxidation reaction.

Reactor operating process of the present invention is as described below, a certain amount of pure water of in reactor, packing into, pH value with buffered soln control solution, synergy by tensimeter and magnetic valve, the controlling reactor internal pressure is in OK range, so that simulate the influence of hydraulic pressure to reacting in the actual treatment technology better.Generate the ratio of ozone by regulating the operating voltage of ozonizer, regulate the oxygen that enters ozonizer, thereby control enters in the reactor dividing potential drop of ozone in the gas, ozone concn just can maintain required scope in the solution like this.When ozone concn in the reactor solution reach stable after, target compound is joined in the reactor by injection port with microsyringe, the residual concentration by thief hole sampling analysis target compound regularly extinguishes oxygenant in the sample with S-WAT at once when sample takes out from reactor.Because in experimentation, the concentration of ozone in solution keeps a constant, so can claim that this reactor is half batch reactor.

Characteristics of the present invention are as follows:

1, enter the dividing potential drop of ozone in the gas reactor by adjusting, the ozone concn in the controlling reactor solution easily, and in experimentation, keep in the solution ozone concn constant.

2, by the pH value of buffered soln controlling reactor solution, the pH value maintains a definite value in experimentation.

3, the pressure in the reactor can be controlled by the synergy of tensimeter and magnetic valve, simulates the influence of the variation of hydraulic pressure in the actual treatment technology to ozonization better.

4, the reaction parameters such as pressure in concentration, pH value and the reactor of ozone in solution are controlled easily, can be as required conditioned reaction parameter at any time.

5, material therefor is stainless steel, titanium plate and tetrafluoroethylene, does not have the danger that brings pollution owing to the matrix stripping.

Application example

Example 1: example 1 is one of embodiment of the present invention example, but this patent is not limited only to this.

The stink substance that often contains native mustys such as MIB and geosmin in the drinking water resource, the ozone of bibliographical information all is to obtain under the batch experiment of static state to the kinetic parameter of MIB and geomin oxidation removal, practicality is relatively poor.The inventor uses method and the reactor of introducing above, and the kinetics that the ozone oxidation of MIB and geosmin is removed is studied.In reactor, pack into the pure water of 1L, control the pH value of solution 7.0 with the phosphate buffer soln of 50mmol, pressure-controlling in the reactor is at 0.3atm, ozone concn is respectively 0.35mg/L and 0.69mg/L in the control solution in two experiments, and the starting point concentration that adds MIB and geomin after solution reaches steady state is 400ng/L.The kinetic equation that obtains MIB and geosmin simplification with this understanding is respectively (1) and (2), and the concentration unit of MIB, geosmin and O3 is mmol/L in above-mentioned equation, and time unit is min.

$\frac{{\mathrm{dC}}_{\mathrm{MIB}}}{\mathrm{dt}}=-0.83C_{\mathrm{<figure-callout\; id="3"\; label="MIB\; C\; O"\; filenames="A20051006452600051.png"\; state="\{\{state\}\}">MIB</figure-callout>}}{C}_{O_{}}^{}{{}_3}_{0.44}^{}---\left(1\right)$

$\frac{{\mathrm{dC}}_{\mathrm{GEOSMIN}}}{\mathrm{dt}}=-2.81C_{\mathrm{GEOSMIN}}{C}_{O_3}^{0.61}---\left(2\right)$

Utilize method of the present invention and reactor, can further study the influence that pH removes geosmin MIB.

Claims (4)

1, a kind of appraisal procedure and reactor that is used for ozone oxidation removal water body organism is characterized in that controlling ozone concn in the solution in the experimentation, and the pressure in the reactor can be controlled by the synergy of tensimeter and magnetic valve.

2,, it is characterized in that after ozone concn in the reactor is stable, with microsyringe target compound is joined reactor by injection port and carrying out ozonization according to the described reactor of claim 1.

3, according to the described reactor of claim 1, it is characterized in that the pH value of solution is controlled by buffered soln, measure the influence of pH to reaction kinetics.

4, according to the described reactor of claim 1, it is characterized in that reactor bottom is equipped with titanium net air distribution plate, ozone gas is broken into littler bubble, make ozonization efficient higher.

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