CN111620469A

CN111620469A - Membrane-ozone reaction device for heterogeneous catalysis ozone advanced oxidation technology

Info

Publication number: CN111620469A
Application number: CN202010499266.0A
Authority: CN
Inventors: 丁亚磊; 周小峰; 冯书华; 伏振宇; 李晨; 蔡振山; 陈煜辉; 董林辉
Original assignee: Shenzhen Huixin Environment Technology Co ltd; Shenzhen Changlong Technology Co ltd
Current assignee: Shenzhen Huixin Environment Technology Co ltd; Shenzhen Changlong Technology Co ltd
Priority date: 2020-03-03
Filing date: 2020-06-04
Publication date: 2020-09-04

Abstract

The invention relates to a wastewater treatment device and a wastewater treatment method, in particular to a reaction device and an ozonization process for heterogeneous catalysis ozone advanced oxidation technology. The invention solves the contradiction that the catalyst has small granularity, easy loss and large granularity and low efficiency in the heterogeneous catalytic ozone advanced oxidation technology, particularly combines the ozone advanced oxidation technology with the membrane separation technology, utilizes the membrane separation technology to realize the continuous high-efficiency cyclic use of solid catalysts with various granularities in the catalytic ozonation, ensures that the oxidation is more efficient due to the enrichment action of the membrane, can effectively clean pollutants on the surface of the membrane due to the scouring action of ozone aeration and the advanced oxidation action on the surface of the membrane, prolongs the operation time of the membrane system, and ensures that the water outlet of the system is stable. The membrane-ozone reactor has the advantages of low catalyst loss rate, stable membrane system, long service life, no secondary pollution, high efficiency of pollutant treatment in the whole process, low operation cost and excellent application value.

Description

Membrane-ozone reaction device for heterogeneous catalysis ozone advanced oxidation technology

Background

The ozone water treatment technology utilizes ozone and active free radicals generated by ozone decomposition to oxidize pollutants in water, and has good application prospect in the aspect of sewage treatment. The strong oxidizing property of ozone can directly destroy unsaturated bonds of macromolecular organic matters, quickly react with protein to cause the protein to deteriorate, and enter cells to decompose nucleic acid. The early water treatment mainly utilizes the sterilization, decoloration and deodorization performances of ozone, and has wider application in drinking water treatment. The oxidation capability of the ozone is difficult to completely degrade organic matters, and researches show that the average molecular weight of the organic matters is obviously reduced when the ozone is used for treating wastewater, and the ozone can be used for improving the biodegradability of sewage. The ozone advanced oxidation technology is to promote the decomposition of ozone by adopting methods such as light, electricity, oxidant and the like to generate hydroxyl radical (OH) with higher oxidizability, and the ozone advanced oxidation technology can be used for indiscriminately and thoroughly mineralizing most organic matters in water.

The solid catalyst adopted in the catalytic ozonization process can avoid the pollution of metal ions to water, and common solid catalysts comprise metal oxides, composite metal oxides, activated carbon, molecular sieves, graphene, granular alumina/Martian supported catalysts and the like. The particle size of the solid catalyst is an important factor influencing the catalytic activity, and generally, the smaller the particle size is, the larger the surface area ratio and the exposed active center are, the higher the activity is. But the solid catalyst with undersize particle size is easy to lose, and the recycling process has high difficulty. Powder catalysts are therefore less useful in current water treatment processes, and this problem limits the use of many new catalysts.

Disclosure of Invention

Aiming at the problems of easy loss of powder (small granularity) catalyst and poor repeatability in the actual ozone water treatment process, the invention provides the composite membrane-ozone reaction device, which improves the adding amount and the catalyst surface ratio of the catalyst in the system by combining the membrane separation technology and the ozone advanced oxidation technology, and keeps the solid catalyst in the reaction tank, thereby realizing continuous and efficient catalytic reaction, having higher efficiency and lower cost.

In order to solve the technical problems, the technical scheme is as follows: the membrane-ozone wastewater treatment system mainly comprises a dosing system, a membrane system, an aeration device, an ozone generation system, an ozone destructor, an online detection system and an internal circulation device. The aeration device is arranged at the bottom of the reaction tank body, and the membrane component is arranged on the aeration device. The other end of the water inlet pipe is communicated with a wastewater adjusting tank for storing wastewater, and a water inlet metering pump convenient for water conveying is arranged on the water inlet pipe; the inside membrane module that connects of outlet pipe, the outside is together with the cistern, installs out the water pump between outlet pipe and the cistern. The dosing system comprises a medicine storage tank, a metering pump and a medicine distributor, wherein the medicine distributor is a pipeline medicine distributor made of stainless steel or polytetrafluoroethylene, holes of 1-10 mm are uniformly distributed on a pipeline, the hole diameter is gradually increased along a certain gradient from a medicine inlet for ensuring the uniformity of a medicament, and the gradient is 0.1-1 mm/100 mm. The membrane-ozone sewage treatment device has the functions of forward washing and back washing of the filter membrane, and can be used for online removal of pollutants on the filter membrane, so that the membrane component can be blocked due to long-time working. The timing backwashing function can prolong the service life of the membrane component and reduce the cost while improving the treatment effect.

The membrane-ozone reaction device for the heterogeneous catalysis ozone advanced oxidation technology is characterized in that the measurable index of the detector is one or more of COD, ozone, ORP, pH, ammonia nitrogen, total phosphorus, total nickel and total copper.

The membrane-ozone reaction device for the heterogeneous catalytic ozone advanced oxidation technology is characterized in that the internal circulation system is a pipeline internal circulation device, a circulation pump is connected to the outside of a circulation pipeline, and the water flow circulation amount and the circulation direction are adjustable.

The ozone generator is connected with the aeration device through an ozone pipeline, and a pressure gauge and an air inlet valve are arranged on the ozone pipeline.

In the membrane-ozone reaction device for the heterogeneous catalytic ozone advanced oxidation technology, the water inlet pipe, the water outlet pipe, the dosing device and the pipeline of the circulating system are all provided with water outlet valves.

The membrane-ozone reaction device for heterogeneous catalytic ozone advanced oxidation technology is preferably an oxidation-resistant, acid-resistant and alkali-resistant ceramic membrane for the membrane module, and the main body bracket is preferably 304 stainless steel.

The beneficial effect of this device is as follows:

the device adopts the membrane to intercept pollutants and catalysts in the system, and the effluent is stable. The solid catalyst with the particle size of more than 0.2 mu m can be applied to the reaction system, the application range is wide, the catalyst can be continuously used, and the loss is small.

In the membrane-ozone reaction process disclosed by the invention, the regulation and control range of the adding amount of the powder catalyst is large and ranges from 0mg/L to 20000mg/L, and the catalytic efficiency is higher.

In the membrane-ozone reaction process disclosed by the device, pollutants are enriched on the surface of the membrane, ozone oxygen is exposed near the membrane, the advanced oxidation efficiency is higher, the cleaning effect of the advanced oxidation avoids the adhesion and blockage of organic components on the surface of the membrane, and the stability, the service life and the energy consumption of the membrane system are greatly prolonged and lower.

The membrane-ozone reaction device disclosed by the invention can regulate and control reaction conditions through online detection and a medicine distributor, so that the efficiency is maximized.

Drawings

FIG. 1 is a schematic view of the patent structure of the present invention

In the figure, 1, a medicine storage tank, 2, a detector, 3, a medicine distributor, 4, a water outlet, 5, a membrane component, 6, a clean water tank, 7, an ozone destructor, 8, a solid medicine feeding port, 9, a water outlet, 10, a metering pump, 11, a circulating pipeline, 12, an aeration disc, 13, a water storage tank, 14, an oxygen tank and 15, an ozone generator are arranged.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings of the present invention, and it is obvious that the embodiments are a part of the embodiments of the present invention, but not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.

Referring to fig. 1, the membrane-ozone reaction device for heterogeneous catalytic ozone advanced oxidation technology comprises a medicine storage tank 1 and a medicine distributor 3, a metering pump is arranged between the medicine storage tank and the medicine distributor, a membrane component 5 is connected inside a water outlet pipe 4, the outside of the water outlet pipe is communicated with a clean water tank 6, a water outlet pump is arranged between the clean water tank and the water outlet pipe, an aeration device 12 is arranged below the membrane component, ozonized oxygen is sprayed out from the aeration device and is flushed into the membrane component, the purpose of air-water mixing is achieved, and pollutants on the surface of the membrane are cleaned; the aeration device is connected with an ozone generator 15, the ozone generator is provided with an oxygen generator or an oxygen steel cylinder 14, in order to ensure that the reaction is more sufficient, the equipment is provided with an internal circulation system, a metering pump 10 is arranged on an external circulation pipeline 11, and the direction and the flow of water flow are regulated and controlled by the metering pump. The upper end of the reactor and the water outlet scale are symmetrically provided with water inlet pipes 9, the water inlet pipes are communicated with a water storage tank 13, and the middle part of the water inlet pipes is provided with a metering pump; the detector probe 2 is arranged at the top end of the reactor and opposite to the water inlet, the outside of the reactor is connected with an online detection instrument, the detector is associated with a dosing system, and the dosing amount can be adjusted according to the detection result; the top end of the reaction tank body is provided with a tail gas hole which is communicated with the ozone destructor. The flange at the top of the tank body is used for capping, so that the tank is convenient to mount and dismount. The top is provided with a solid medicament feeding port 8 which is provided with a sealing cover.

Specifically, when the device is started, an aeration switch is firstly opened, sewage in a water storage tank is pumped into a reactor through a water inlet, a catalyst is added into a reaction tank through a solid dosing port 8, a sealing cover is covered, a detector 2, a tail gas destructor 7 and a circulating pump 10 are opened, the device is preheated after running for about 10 minutes, then an ozone generator 15 and a dosing pump are started, the reaction is carried out for a certain time, the on-line detection shows that indexes meet requirements, membrane equipment is started to discharge water, the flow of the water inlet pump, the dosing pump and the circulating pump is adjusted, the power of the ozone generator is adjusted, the water quality is ensured to reach the standard stably, automatic dosing is started after the system runs stably, and automatic control is realized.

Claims

1. A membrane-ozone reactor for heterogeneous catalytic ozone advanced oxidation technology is composed of chemical feeding system, membrane module, aerating unit, ozone generating system, ozone destructor, on-line detector and internal circulating unit, and features that an air aerating disc is installed at the bottom of ozone reactor and the membrane module is installed close to the aerating disc for spraying ozonized oxygen and passing through the membrane module.

2. The membrane-ozone reactor for heterogeneous catalytic ozone advanced oxidation technology according to claim 1, wherein an external circulation system is provided, and the amount and direction of the circulating water can be controlled.

3. The membrane-ozone reactor for heterogeneous catalytic ozone advanced oxidation technology according to claim 1, wherein the equipment is equipped with an automatic dosing system, and the dosing system is equipped with a medicine distributor.

4. The membrane-ozone reactor for heterogeneous catalytic ozone advanced oxidation technology according to claim 1, wherein the equipment is equipped with an on-line detection device, and the detection device is associated with an automatic dosing device.

5. The membrane-ozone reactor for heterogeneous catalytic ozone advanced oxidation technology according to claim 1, characterized in that the equipment is equipped with a tail gas treatment device, which is an ozone destructor.