CN1182047C

CN1182047C - Ozone catalytic oxidation water processing method

Info

Publication number: CN1182047C
Application number: CNB021088454A
Authority: CN
Inventors: 军马; 马军; 翟学东; 隋铭皓; 刘增贺
Original assignee: Individual
Current assignee: Individual
Priority date: 2002-04-13
Filing date: 2002-04-13
Publication date: 2004-12-29
Anticipated expiration: 2022-04-13
Also published as: CN1473772A

Abstract

The present invention relates to a high-grade water treatment method which can be applied to water supply and sewage treatment. The present invention is characterized in that a specific catalytic ozonation contact reactor is used so that a catalyst participates in a water treatment procedure through ozone oxidation; raw water of different water quality is treated in a catalytic ozonation process; in the process, tail gas of ozone can be recycled or collected in the concentrated mode and treated by a breaker for the tail gas of ozone. The capability of removing pollutants of difficult degradation and high stability of the method comprehensively exceeds the capability of removing pollutants of difficult degradation and high stability of traditional conventional water treatment technology and ozone treatment technology, and the water treatment cost can be greatly reduced. The technology can be used alone and can also be combined with other water treatment processes for use.

Description

Ozone catalytic oxidation water processing method

Technical field:

The present invention relates to the Persistent organic pollutants in a kind of ozone catalytic oxidation water processing method, particularly treating water.

Background technology:

Ozone oxidation is a kind of traditional water technology, uses in Dutch water factory early than 1893, has been widely used in water treatment field at present abroad, the domestic example that also has ozone to be applied to produce.Ozonation technology is to utilize the part readily oxidizable substance in the oxidisability oxygenolysis water of ozone to reach the depollution purpose.But in recent years, because the source water water quality deterioration, the poisonous and hazardous organic pollutant of a large amount of difficult degradations enters water body, and is wherein typical in agricultural chemicals, algae toxin, weedicide, soil ulmin, benzene compounds, plastic plasticizer etc.These material parts have been proved to be that belonging to is detrimental to health three causes material, and in recent years studies show that wherein have suitable major part to belong to environmental hormone class material, can produce harm secular, that can not repair to the Human Physiology system by drinking or using.According to domestic and international relevant report, this part organic pollutant almost can not be removed in the water technology of routine, and the cholorination technology in the conventional water treatment process can increase the toxic action of organic pollutant in the water.On the other hand, with industrial development, the sewage output that contains various Persistent organic pollutants raises year by year, and the pollution substance kind increases year by year, and directly sewage is entered water body will cause more serious pollution, therefore must handle such sewage.Traditional ozonation technology is owing to the oxidation capacity that is subjected to ozone and throw quantitative limitation, can't be to this class difficult degradation in the water, and poisonous and hazardous pollutent is effectively removed.

Summary of the invention:

Task of the present invention provides a kind of treatment process that can improve hardly degraded organic substance in the ozone oxidation water, promptly adds catalyzer and improve the ozone oxidation ability in ozone oxidation reaction, and reduce cost of water treatment.Method of the present invention is, adds new catalyst in the catalytic ozonation contact reactor, utilizes the former water of the various water quality of catalytic ozonation art breading; Ozone tail gas recycling or centralized collection in the technology after the ozone tail gas destructor handle; Described catalyzer is a solid catalyst, the working method of solid catalyst is as follows: catalyst base is a gac, granular carbon is ground to form 60 orders particulate in the 20 order scopes, be dipped in the potassium permanganate solution, at room temperature vibrated 3～24 hours, wore out 24～144 hours down at 14 ℃～25 ℃ then, remove solution at last, promptly obtain described solid catalyst; The catalyst preparation process parameter: potassium permanganate solution concentration be 0.05～0.2 rub/liter, with the quality of activated carbon ratio be 0.04～3: 3.2.This invention---catalytic ozonation water technology can use separately and feed water or sewage disposal, also can unite use with other water technology.Owing to there is catalyzer to participate in the ozone oxidation organism, this method can effectively be removed other pollutents such as organic pollutant, peculiar smell, look turbid in the water and bacterium, virus, heavy metal, and it has very high depollution efficient, can improve comprehensively and handle back water quality.It is to difficult degradation, the high stability contaminant removal capacity surpasses traditional conventional water technology and ozonize technology comprehensively, and compares because the water ozone amount required for the present invention of processing unit vol is lower than the need ozone amount of similar ozone process and can reduces cost of water treatment significantly with traditional ozonize technology.The present invention is applicable to the processing of the former water of various water quality.

Embodiment:

Treatment process of the present invention is finished by a cover catalytic ozonation contact reactor, concrete technical process is that ozone enters contact reactor by contact reactor middle and lower part or the special air distributing device of periphery, water is fully contacted in this reactor with the catalyzer of ozone, special use, utilize catalyzer to come the oxidation of catalysis ozone to water pollutant, improve its oxidation depollution ability, make the oxidized removal of water pollutant; This reactor is with reacted ozone tail gas centralized collection, ozone tail gas can be used for safe disinfection or former water pretreatment, to improve whole water treatment efficiency, under the situation of not using ozone tail gas, handle ozone tail gas by specific ozone tail gas destructor, prevent that it from entering surrounding environment.

The catalytic ozonation contact reactor is divided into downflow system (former water is by the water outlet of water inlet top, below) catalytic ozonation contact reactor and reverse-flow (former water is by top water inlet below water outlet) catalytic ozonation contact reactor and mixes streaming that (former water is by the water inlet of reactor middle part according to the water inlet direction, by the respectively water outlet of reactor both sides) three kinds, can select according to the water treatment field condition.

This catalytic ozonation reactor process design variable is as follows: ozone and 15～60 minutes duration of contact of water; Catalyzer and water, ozone contact time 10～50 minutes; 20 centimetres～140 centimetres of solid catalyst layer thicknesses are divided into 1 layer or multilayer layout, can guarantee that like this catalyzer utilizes in batches, prolong the duration of service of catalyzer; Ozone dosage 0.5～6.5 mg/litre water in the reactor, 2～15 meters/hour of flow velocities.The catalytic ozonation reactor is by the ozone gas distribution system, the ozone tail gas gathering system, and water inlet system, outlet system, the solid catalyst layer is formed.Reactor is made and liner resistance to oxidation corrosion protection coating with the stainless steel processing and fabricating or with other materials.

The ozone gas distribution adopts titanium plate micro-hole aerator, standpipe aerator, even one or more modes that combine of air inlet of periphery to finish in the reactor, adopts the top vault construction to collect ozone tail gas in conjunction with vent valve, and the ozone ability of adding is 1～7 mg/litre water.

Can collect with the tail gas that the inventive method produces, can be used in former water pre-oxidation treatment and ozonization in the water technology behind the exhaust collection.

Perhaps the ozone tail gas processing adopts the tail gas destructor to handle in the catalytic ozonation water technology, adopts thermal decomposition process and catalytic decomposition bonded mode or a kind of mode wherein to handle.Leading portion thermal treatment is with the thermal chamber of ozone tail gas by 100 ℃～400 ℃, 15～40 minutes tail gas residence time; The back segment catalytic treatment is to make ozone tail gas by the catalyzer that can destroy ozone being housed, 15～40 minutes catalytic Contact time.Tail gas is handled the back through destructor and is directly discharged.

The solid catalyst working method that adopts in the treatment process is as follows: catalyst base is a gac, and granular carbon is ground to form 60 orders particulate in the 20 order scopes, is dipped in the potassium permanganate solution.At room temperature vibrated 3～24 hours, and wore out 24～144 hours down at 14 ℃～25 ℃ then.Remove solution at last.The carrier that the taking-up outside surface is attached with catalyzer uses.The catalyst preparation process parameter: potassium permanganate solution concentration be 0.05～0.2 rub/liter, with the quality of activated carbon ratio be 0.04～3: 3.2.The specification of obtained solid catalyst is that diameter 60 orders are between 20 orders.

Claims

1, a kind of ozone catalytic oxidation water processing method is characterized in that adding new catalyst in the catalytic ozonation contact reactor, utilizes the former water of the various water quality of catalytic ozonation art breading; Ozone tail gas recycling or centralized collection in the technology after the ozone tail gas destructor handle; Described catalyzer is a solid catalyst, the working method of solid catalyst is as follows: catalyst base is a gac, granular carbon is ground to form 60 orders particulate in the 20 order scopes, be dipped in the potassium permanganate solution, at room temperature vibrated 3～24 hours, wore out 24～144 hours down at 14 ℃～25 ℃ then, remove solution at last, promptly obtain described solid catalyst; The catalyst preparation process parameter: potassium permanganate solution concentration be 0.05～0.2 rub/liter, with the quality of activated carbon ratio be 0.04～3: 3.2.

2, ozone catalytic oxidation water processing method according to claim 1, the using method that it is characterized in that described solid catalyst is: the specification of catalyzer is that diameter 60 orders are between 20 orders, the catalyzer phase, water and ozone three-phase reach 1050 minutes duration of contact in reactor, catalyzer is divided into 1 layer or multilayer, be distributed in the catalytic ozonation reactor with 20 centimetres～140 centimetres total thickness, the overcurrent speed that former water flows through catalyzer is 2～15 meters/hour.

3, ozone catalytic oxidation water processing method according to claim 1 and 2, it is characterized in that described catalytic ozonation contact reactor is made up of ozone gas distribution system, ozone tail gas gathering system, water inlet system, outlet system, solid catalyst layer, this catalytic ozonation contact reactor is processed by stainless steel.

4, ozone catalytic oxidation water processing method according to claim 3, it is characterized in that in the ozone oxidation water treatment procedure, ozone is entered by the air distributing device of catalytic ozonation contact reactor middle and lower part or periphery, adopts titanium plate micro-hole aerator, standpipe aerator, even one or more modes that combine of air inlet of periphery to finish; Adopt the top vault construction to collect ozone tail gas in conjunction with vent valve, its ozone dosage is 0.5～6.5 mg/litre water, and ozone and water duration of contact are 15～60 minutes.

5, ozone catalytic oxidation water processing method according to claim 3, it is characterized in that in the ozone oxidation water treatment procedure, former water flows out into the following current way of contact by entering the top from catalytic ozonation contact reactor below, or enter the below by reactor top and flow out into the counter current contact mode, or enter by reactor middle part, by reactor up and down both sides respectively water outlet become the mixed flow way of contact.

6, ozone catalytic oxidation water processing method according to claim 3, it is characterized in that the ozone tail gas in the technology adopts the tail gas destructor to handle, its method is that the mode of thermal decomposition process and/or catalytic decomposition is handled: thermal decomposition process is with the thermal chamber of ozone tail gas by 100 ℃～400 ℃, 15～40 minutes tail gas residence time; It is to make ozone tail gas by the catalyzer that can destroy ozone is housed that catalytic decomposition is handled, and 15～40 minutes catalytic Contact time, tail gas is handled the back through the tail gas destructor and directly discharged.