CN106800332A - A kind of method for treating water of utilization slag catalysis ozone - Google Patents

Abstract

A water treatment method using steel slag to catalyze ozone solves the problems of low reaction efficiency in the single ozonation water treatment method, high catalyst cost, complicated preparation, and poor pollutant removal effect in the existing catalytic ozonation water treatment method. The method of the present invention is to add steel slag into the reactor equipped with sewage, add 1-50g per liter of water to be treated, then continuously feed 0.5-3.0mg/L of ozone, control the reaction time for 5min-120min, and realize the removal of organic matter. The invention has the characteristics of easy acquisition of catalyst, low cost, high activity, long service life, fast reaction speed, high removal efficiency, treating waste with waste, simple operation and the like. The water treatment method utilizing steel slag to catalyze ozone can remove more than 98% of p-chlorobenzoic acid.

Description

A water treatment method using steel slag to catalyze ozone

technical field

The invention relates to a water treatment method using steel slag to catalyze ozone, in particular to a method for using a catalyst to strengthen ozone oxidation to remove refractory organic pollutants in water.

Background technique

The oxidation-reduction point of ozone under standard conditions is 2.07eV, which can quickly and efficiently remove organic matter in water. Under the action of the catalyst, ozone decomposition produces more oxidative and non-selective hydroxyl radicals (OH, the redox point of which is 2.80eV under standard conditions), which can greatly improve the removal efficiency of refractory organic matter in water. There have been large-scale research and applications in the field of water treatment.

Steel slag is a solid waste produced in the steelmaking process. Its comprehensive utilization rate is low and its stockpile is large. It is often used as artificial wetland filler, soil conditioner or building material. Steel slag has good catalytic activity as a molten composite of multi-metal oxides. Its ability to catalyze ozonolysis and oxidize organic pollutants is directly related to its surface properties. The catalytic mechanism includes two aspects: one is that the metal ions on the surface of the metal oxide combine with water to form a hydroxylated interface. Ozone molecules and these surface hydroxyl groups form a five-membered ring structure through coordination bonds and hydrogen bonds, and then decompose to form OH through electron transfer. The second is that ozone first reacts with metal cations on the surface to form unstable intermediate products, and then decomposes to form OH. Using steel slag as a catalyst to catalyze ozone oxidation to degrade organic pollutants in water, "treating waste with waste", greatly reduces treatment costs, and at the same time has very important practical significance for effectively solving the problems of organic pollution control in water bodies and steel slag reuse in my country.

Contents of the invention

The invention solves the problems of low reaction efficiency in the single ozonation water treatment method, high catalyst cost, complex preparation, and poor pollutant removal effect of the existing catalytic ozonation water treatment method, and provides a water catalyzed ozone catalyst using steel slag. Approach.

A kind of water treatment method utilizing steel slag to catalyze ozone of the present invention is as follows:

Steel slag is added to the reactor with sewage, and then ozone aeration is continuously introduced to control the reaction time, which realizes the removal of organic matter in water. Among them, the dosage of steel slag is 1-50g/L, the ozone intake concentration is 0.5-30mg/L, the intake flow rate is 0.2-1.0L/min, and the reaction time is 5-120min.

The steel slag in the present invention is added in the form of solid particles or powder.

The invention uses steel slag as a catalyst to catalyze ozone to generate OH with stronger oxidizing property and lower selectivity, thereby improving the removal rate and efficiency of pollutants. Compared with other catalysts, steel slag has the characteristics of low price, easy acquisition, high catalytic activity, long life, treating waste with waste, and simple recycling and utilization. The water treatment method of the present invention can process domestic sewage and various industrial organic waste water, and the removal rate of 50 mg/L chlorobenzoic acid can reach more than 98%.

Description of drawings

Figure 1 is a comparison chart of the removal rate of p-chlorobenzoic acid in water degraded by ozone alone oxidation and steel slag catalytic ozonation oxidation.

detailed description

The present invention will be further described below. The scope of protection claimed by the present invention is not limited to the scope described in the specific embodiments.

Example 1:

Add 20g/L steel slag to the reactor containing sewage (the concentration of p-chlorobenzoic acid is 50mg/L), and then introduce ozone for aeration. The ozone inlet concentration is 1mg/L, and the inlet flow rate is 0.2L/ min, the residence time of wastewater in the reactor is 30min.

From the comparison of the p-chlorobenzoic acid removal curves of the single ozonation and steel slag catalytic ozonation in Figure 1, it can be seen that the p-chlorobenzoic acid removal rate of the single ozonation 2h is only 15%.

Example 2:

Add 50g/L steel slag to the reactor containing the water to be treated, and use ozone to aerate the water to be treated with the steel slag added. The ozone intake concentration is 30mg/L, and the intake flow rate is 0.6L/min. The residence time of the water to be treated in the reactor is 60min.

From the comparison of the p-chlorobenzoic acid removal rate curves of single ozonation and steel slag-catalyzed ozonation in Figure 1, it can be seen that the removal rate of p-chlorobenzoic acid can reach more than 82% after steel slag-catalyzed ozonation for 1 hour.

Example 3:

Add 50g/L steel slag to the reactor containing the water to be treated, and use ozone to aerate the water to be treated with the steel slag added. The ozone intake concentration is 15mg/L, and the intake flow rate is 1.0L/min. The residence time of the water to be treated in the reactor is 120min.

From the comparison of p-chlorobenzoic acid removal curves in Figure 1, it can be seen that the removal rate of p-chlorobenzoic acid can reach more than 98% after 2 hours of steel slag catalytic ozonation.

Claims (9)

1. A water treatment method utilizing steel slag to catalyze ozone is characterized in that steel slag is added to a reactor equipped with sewage, and then ozone aeration is continuously introduced to control the reaction time to realize the removal of organic matter in water; wherein steel slag is injected The dosage is 1-50g/L, the ozone intake concentration is 0.5-30mg/L, the intake flow rate is 0.2-1.0L/min, and the reaction time is 5-120min. 2. water treatment method according to claim 1, is characterized in that, described sewage is the sewage that p-chlorobenzoic acid concentration is 50mg/L. 3. according to claim 1 and 2 described water treatment methods, it is characterized in that, in the reactor that p-chlorobenzoic acid concentration is 50mg/L sewage, add 50g/L steel slag, pass into ozone then and carry out aeration, ozone The inlet concentration is 1mg/L, the inlet flow rate is 0.2L/min, and the residence time of wastewater in the reactor is 30min. 4. according to claim 1 and 2 described water treatment methods, it is characterized in that, in the sewage reactor that p-chlorobenzoic acid concentration is 50mg/L, add 30g/L steel slag, ozone inlet concentration is 15mg/L, The intake flow rate is 0.6L/min, and the reaction time is 60min. 5. according to claim 1 and 2 described water treatment methods, it is characterized in that, p-chlorobenzoic acid concentration is the steel slag of 50g/L in the sewage reactor of 50mg/L, and ozone inlet concentration is 15mg/L, The intake flow is 1.0L/min, and the residence time of the water to be treated in the reactor is controlled to be 120min. 6. The water treatment method according to claim 1 or 2, characterized in that the steel slag is added in the form of solid particles or powder. 7. The water treatment method according to claim 3, characterized in that the steel slag is added in the form of solid particles or powder. 8. The water treatment method according to claim 4, characterized in that the steel slag is added in the form of solid particles or powder. 9. The water treatment method according to claim 5, characterized in that the steel slag is added in the form of solid particles or powder.