CN1562797A

CN1562797A - Method for improving 03/H202 technical effect by adding H202 into drinking water at multiple points along path

Info

Publication number: CN1562797A
Application number: CN 200410013656
Authority: CN
Inventors: 马军; 石枫华
Original assignee: Harbin Institute of Technology
Current assignee: Harbin Institute of Technology
Priority date: 2004-04-02
Filing date: 2004-04-02
Publication date: 2005-01-12
Anticipated expiration: 2024-04-02
Also published as: CN1261372C

Abstract

The invention relates to a technology of increasing oxide effect of O3/H2O2 catalytic oxidation processing by adjusting H2O2 putting way. The method is to sent O3 in each stages ozone contact reaction tower used for processing drinking water source to do ozonization treatment to water quality, and H2O2 is required to be put into second stage ozone contact reaction tower and the one behind it to do catalytic oxidation, mole ratio of quanlity of H2O2 and O3 is (0.4-1):1.

Description

In the drinking water along journey multi-point adding H 2O 2Improve O 3/ H 2O 2The method of technological effect

Technical field:

The present invention relates to a kind of by regulating H ₂O ₂Dosing method improves O ₃/ H ₂O ₂The technology of catalytic oxidation technique oxidation effectiveness.

Background technology:

At present, the organic pollutant of a large amount of synthetic has become the principal pollutant matter that causes the Drinking Water in China source quality constantly to worsen.Because many artificial synthetic chemistry of organic compound Stability Analysis of Structures are difficult to oxidized decomposition, and have very big toxicity and teratogenesis, carcinogenic, mutagenicity, water treatment technology or the method that therefore must take to be fit to could be with its effective removals.

Summary of the invention:

The object of the present invention is to provide and a kind of organic compound in the drinking water is carried out the method for catalytic oxidation, in drinking water along journey multi-point adding H ₂O ₂Improve O ₃/ H ₂O ₂The method of technological effect comprises: pass into O in the ozone contact reaction towers at different levels that drinking water source is processed ₃Water quality is carried out ozonation, need in secondary ozone contact reaction tower and later ozone contact reaction tower, add again respectively H ₂O ₂Carry out catalytic oxidation, H ₂O ₂With O ₃The mol ratio of dosage is (0.4～1): 1.O ₃/ H ₂O ₂Catalytic oxidation technique is a kind of advanced oxidation processes of having very much application potential in extensive drinking water treatment.It mainly is to utilize H ₂O ₂Cause ozone and in water, decompose the hydroxyl radical free radical (OH) that generates valid density, utilize high stability in hydroxyl radical free radical (OH) the oxidation Decomposition water, dysoxidizable organic matter.A large amount of studies show that O ₃/ H ₂O ₂Catalytic oxidation technique can the efficient oxidation be removed the high stability in the water, dysoxidizable organic pollution, and its technological operation is simple, to the no specific (special) requirements of condition (such as the carbonate alkalinity level in the water, pH value) of water quality treatment.But because H ₂O ₂Only the subparticipation catalytic oxidation has quite a few still to remain in the water, therefore optimizes H ₂O ₂Dosing method to improve O ₃/ H ₂O ₂The oxidation effectiveness of catalytic oxidation technique reduces H simultaneously ₂O ₂Surplus is further to improve O to reduce it to the impact of processing rear effluent quality ₃/ H ₂O ₂The break-through point of catalytic oxidation technique oxidation effectiveness.With H ₂O ₂Adopt multi-point adding mode and ozone to add synchronously, can improve O ₃/ H ₂O ₂Catalytic oxidation technique is to high stability, the oxidation effectiveness of difficult oxidation of organic compounds.

Description of drawings:

Fig. 1 is the structural representation of embodiment two, and Fig. 2 is the structural representation of embodiment three, and Fig. 3 is the structural representation of embodiment four.

Embodiment:

The specific embodiment one: the present invention has developed a kind of multi-point adding H ₂O ₂To improve O ₃/ H ₂O ₂The method of catalytic oxidation technique oxidation effectiveness.It is included in the ozone contact reaction towers at different levels that drinking water source is processed and passes into O ₃Water quality is carried out ozonation, and the present invention need to add respectively H again in secondary ozone contact reaction tower and later ozone contact reaction tower ₂O ₂Carry out catalytic oxidation, the H in every one-level ozone contact reaction tower ₂O ₂Can be at O ₃Add H before ₂O ₂Also can be at O ₃Add H after adding ₂O ₂With O ₃The mol ratio of dosage is (0.4～1): 1, O ₃With the time of contact of water be 5～15 minutes, H ₂O ₂With the time of contact of water be 10～20 minutes.Because O ₃/ H ₂O ₂OH is the main oxidant in the reaction system in the catalytic oxidation technique, and its oxidisability is very strong, and the oxidation reaction non-selectivity, and therefore, the generating mode of OH will directly affect O ₃/ H ₂O ₂Catalytic oxidation technique is to the oxidation effectiveness of organic pollutants.

Experimental study is found, the H that total amount is certain ₂O ₂With O ₃In the input response system, the oxidation effectiveness of difficult oxidation of organic compounds obviously is better than H in the water several times ₂O ₂In the disposable input response system.The reason of analyzing this result of the test is, at the disposable H that adds ₂O ₂Condition under, the starting stage of reaction will generate the higher OH of relative concentration.Because the oxidation characteristic of OH, the OH of these generations be except the difficult oxidation organic contamination beyond the region of objective existence in a part of oxidize water, between other OH and OH and H ₂O ₂Between also can interreaction, thereby make a large amount of OH cancellation, therefore subsequent reactions in the stage in the system valid density of OH be not enough to continue difficult oxidation of organic compounds in the oxidize water.On the contrary, with H ₂O ₂Several times in the input response system, in the whole stage of reaction, along with H ₂O ₂Multiple spot continues to add, and OH can constantly generate in reaction system, thereby its concentration can be remained in certain effective range, therefore is conducive to the lasting oxidative degradation of difficult oxidation of organic compounds in the water.

The specific embodiment two: with reference to Fig. 1, when the organic matter that is difficult in the water be decomposed by ozone oxygen is major pollutants, only in one-level ozone contact reaction tower (pond), adopt independent ozonisation, O ₃With the time of contact of water be 5min～10min, O ₃Can fully contact to remove with water the organic matter of easy oxidation in the water; And at follow-up ozone contact reaction tower (pond) with H ₂O ₂Synchronous and ozone adds and carries out catalytic oxidation, H ₂O ₂With the time of contact of water be 10min～20min, continue to remove the difficult oxidation of organic compounds in the water.

The specific embodiment three: with reference to Fig. 2, when the organic matter that is easy in the water be decomposed by ozone oxygen is major pollutants, only in the end add H in one-level or the last secondary ozone contact reaction tower (pond) ₂O ₂, H ₂O ₂With the time of contact of water be 10min～15min, difficult oxidation of organic compounds a small amount of in the water is carried out catalytic oxidation, and all adopts independent ozonisation in the ozone contact reaction tower in front (pond), O ₃With the time of contact of water be 5min～15min.

The specific embodiment four: with reference to Fig. 3, for pipeline reactor, can add H along duct segments ₂O ₂, when segmentation adds, utilize static mixer with the H in the input response system ₂O ₂With O ₃, water mixes, and can according to contained organic characteristics in the water, determine H simultaneously ₂O ₂The input point.

Design multistage polyphone ozone contact reaction tower (pond), in every order reaction tower (pond), design H along journey ₂O ₂Add a little.In actual water treatment procedure, according to pending water quality, determine O ₃With H ₂O ₂Total throwing amount, adopt distributing then adds, with H ₂O ₂In batches in the input response system.

Result of the test shows, works as O ₃Total throwing amount is 24.6mg, H ₂O ₂Total throwing amount is 8.6mg, and oxidization time 25min is when the initial concentration of nitrobenzene is 34.52 μ g/L, with H ₂O ₂And O ₃In the disposable input reactor, the oxidation removal rate of nitrobenzene 25min is 64%, and average mark adds H five times before each 5min stage of reaction ₂O ₂And O ₃The time, the oxidation removal rate of nitrobenzene 25min is 100%.

Claims

1, in a kind of drinking water along journey multi-point adding H ₂O ₂Improve O ₃/ H ₂O ₂The method of technological effect, it is included in the ozone contact reaction towers at different levels that drinking water source is processed and passes into O ₃Water quality is carried out ozonation, it is characterized in that in secondary ozone contact reaction tower and later ozone contact reaction tower, adding again respectively H ₂O ₂Carry out catalytic oxidation, H ₂O ₂With O ₃The mol ratio of dosage is (0.4～1): 1.

2, in the drinking water according to claim 1 along journey multi-point adding H ₂O ₂Improve O ₃/ H ₂O ₂The method of technological effect is characterized in that H ₂O ₂With O ₃Add synchronously.

3, in the drinking water according to claim 1 and 2 along journey multi-point adding H ₂O ₂Improve O ₃/ H ₂O ₂The method of technological effect is characterized in that O ₃With the time of contact of water be 5～15 minutes, H ₂O ₂With the time of contact of water be 10～20 minutes.