CN-121651536-B - Mineral water ozone sterilization flow reflux compensation method and system

CN121651536BCN 121651536 BCN121651536 BCN 121651536BCN-121651536-B

Abstract

The invention relates to a mineral water processing method, in particular to a mineral water ozone sterilization flow reflux compensation method and system. The method and the system comprise the steps of obtaining critical contact time, obtaining target flow according to the critical contact time, obtaining current inflow flow entering an ozone contact tank, comparing the current inflow flow with the target flow, calculating a flow gap value, determining backflow compensation flow based on the gap value, backflow the treated water body to the inflow end according to the backflow compensation flow so as to maintain the comprehensive flow in the contact tank to be constant at the target flow, and dynamically adjusting ozone dosing parameters. Through flow reflux compensation, the comprehensive flow in the contact tank is not limited by the actual demand of the tail end of the production line, and under the low-load working condition, the single residence time of the water body can be shortened artificially by increasing the reflux quantity, so that the problem of bromate overstandard caused by long-time exposure of the water body to the ozone environment due to flow reduction is solved.

Inventors

HAO XIAOWEI
ZHANG CAIZHEN
DUAN LIAN
CHEN XIAOZHAN
LIU DAWEN

Assignees

乐百氏(广东)饮用水有限公司

Dates

Publication Date: 20260505
Application Date: 20260209

Claims (9)

1. The mineral water ozone sterilization flow reflux compensation method is characterized by comprising the following steps: Acquiring critical contact time length when a water body is contacted with ozone according to a preset bromate safety threshold; Acquiring the target flow of the water body according to the critical contact time length; acquiring the current inflow water flow entering an ozone contact tank; comparing the current water inflow with the target flow, calculating a flow gap value when the current water inflow is smaller than the target flow, and determining a backflow compensation flow according to the flow gap value; The water body treated by the ozone contact tank is refluxed to the water inlet end of the ozone contact tank according to the reflux compensation flow so as to maintain the comprehensive flow in the ozone contact tank to be constant at the target flow; According to the target flow and the real-time water quality parameters, dynamically adjusting the ozone adding parameters of the ozone contact tank; the step of obtaining the critical contact time length of the water body and ozone when the water body is contacted according to the preset bromate safety threshold value comprises the following steps: Acquiring a working condition mapping table through experiments, wherein the working condition mapping table records critical contact time lengths which are not more than the bromate safety threshold and correspond to different temperature intervals and pH intervals; acquiring real-time water quality parameters in the ozone contact tank, wherein the real-time water quality parameters at least comprise pH value and water temperature; And inquiring the critical contact time length corresponding to the working condition mapping table according to the real-time water quality parameter.
2. The method for compensating for the reflux of the ozone sterilization flow of the mineral water according to claim 1, wherein the step of obtaining the target flow of the water body according to the critical contact time period comprises the steps of: Acquiring the capacity of an ozone contact tank; and calculating and acquiring the target flow according to the capacity of the ozone contact tank and the critical contact time.
3. The method for compensating for the backflow of the ozone sterilization flow of mineral water according to claim 1, wherein dynamically adjusting the ozone addition parameters of the ozone contact tank according to the target flow and the real-time water quality parameters comprises: Layering the ozone contact tank in the vertical or horizontal direction, and dividing a plurality of ozone adding areas according to layering; according to the flow velocity distribution of each ozone adding area under the target flow, obtaining the feeding distribution coefficient of each ozone adding area; And adjusting the ozone adding proportion of each ozone adding area according to the feeding distribution coefficient.
4. The method for compensating for the reflux of the ozone sterilization flow rate of mineral water according to claim 1, wherein the refluxing the water body treated by the ozone contact tank to the water inlet end of the ozone contact tank according to the reflux compensation flow rate comprises: and performing unsteady pulse backflow at a preset frequency to generate artificial eddy currents inside the ozone contact tank.
5. Mineral water ozone sterilization flow back flow compensation system, its characterized in that includes: the flow monitoring module is used for collecting the current inflow water flow entering the ozone contact tank in real time; the reflux module is arranged between the water outlet end and the water inlet end of the ozone contact tank and comprises a reflux pipeline and a controlled power pump, and is used for guiding the water body treated by the ozone contact tank from the water outlet end to the water inlet end; the ozone adding module is used for adding ozone into the ozone contact tank; The controller is connected with and controls the flow monitoring module, the backflow module and the ozone adding module, and is configured to obtain critical contact time when the water body is contacted with ozone according to a preset bromate safety threshold; the backflow module leads the water body treated by the ozone contact tank from the water outlet end of the ozone contact tank to the water inlet end of the ozone contact tank according to the backflow compensation flow, so that the comprehensive flow of the ozone contact tank is maintained at the target flow, and the operation parameters of the ozone adding module of the ozone contact tank are dynamically adjusted according to the target flow and real-time water quality parameters; the step of obtaining the critical contact time length of the water body and ozone when the water body is contacted according to the preset bromate safety threshold value comprises the following steps: Acquiring a working condition mapping table through experiments, wherein the working condition mapping table records critical contact time lengths which are not more than the bromate safety threshold and correspond to different temperature intervals and pH intervals; acquiring real-time water quality parameters in the ozone contact tank, wherein the real-time water quality parameters at least comprise pH value and water temperature; And inquiring the critical contact time length corresponding to the working condition mapping table according to the real-time water quality parameter.
6. The mineral water ozone sterilizing flow back-flow compensation system of claim 5, further comprising: The water quality monitoring unit is arranged at the front end of the ozone contact tank and comprises a pH sensor and a temperature sensor, and the controller acquires critical contact time length according to feedback data of the water quality monitoring unit and calculates the target flow.
7. The system for compensating for the flow back of the ozone sterilization of mineral water according to claim 5, wherein the power pump in the back flow module is a variable frequency pump.
8. The system for compensating for the flow back of the ozone sterilization of mineral water according to claim 5, wherein the ozone adding module comprises a plurality of independent dosing branches arranged at different spatial positions in the horizontal or vertical direction of the ozone contact tank, and each branch is provided with a controlled proportional regulating valve.
9. The system for compensating for the flow back of the ozone sterilization of mineral water according to claim 7, wherein the controller outputs a frequency command periodically changing to the power pump so that the back flow of water enters the ozone contact tank in a pulse form.

Description

Mineral water ozone sterilization flow reflux compensation method and system Technical Field The invention relates to a mineral water processing method, in particular to a mineral water ozone sterilization flow reflux compensation method and system. Background In the production process of mineral water, in order to ensure that the microbial index reaches the standard and give consideration to good taste, a process combining ozone oxidation and ultraviolet sterilization is generally adopted. Ozone has remarkable advantages in the aspects of inactivating drug-resistant pathogenic bacteria, degrading organic matters and improving water quality, color and taste due to its extremely strong oxidizing ability. However, bromide ions commonly existing in natural mineral water are extremely easy to be converted into byproduct bromate with potential carcinogenicity under the action of ozone oxidation. In the existing water treatment control technology, in order to balance the disinfection effect and chemical safety, the ozone adding concentration is usually regulated in real time according to the water inflow. Although this "cast-in-place" approach can play a role under nominal conditions, the following significant drawbacks remain in actual production operation: First, the physical volume of the ozone contact tank is fixed after the equipment is built. According to the water flow residence time formula (residence time = contact tank volume/inflow), the residence time of the water in the tank increases exponentially as the inflow decreases as the demand at the end of the line decreases. Even though the system can reduce the ozone addition amount, due to abnormal elongation of the contact time, the oxidation reaction between ozone and bromide ions can enter a deep reaction stage, so that the generation amount of bromate is suddenly increased. The existing passive adjustment means cannot break through the rigid constraint of physical volume on residence time. Secondly, the traditional ozone contact tank mostly adopts an integral adding mode, and in a low-flow running state, fluid in the tank is easily converted into a laminar flow state from a turbulent flow state, so that a dead angle or short flow phenomenon is generated in a local area. The water body in the dead angle area generates bromate with extremely high concentration due to excessive exposure to ozone environment, and the water body in the short flow area possibly has the risk of microorganism residue due to insufficient sterilization time. This imbalance in flow field distribution makes a single concentration adjustment approach incapable of achieving accurate risk management in the spatial dimension. Disclosure of Invention In a first aspect, an embodiment of the present application provides a method for compensating for a return flow of a mineral water ozone sterilization flow. Acquiring critical contact time length when a water body is contacted with ozone according to a preset bromate safety threshold; Acquiring the target flow of the water body according to the critical contact time length; acquiring the current inflow water flow entering an ozone contact tank; comparing the current water inflow with the target flow, calculating a flow gap value when the current water inflow is smaller than the target flow, and determining a backflow compensation flow according to the flow gap value; The treated water body is refluxed to a water inlet end according to the reflux compensation flow so as to maintain the comprehensive flow in the contact tank to be constant at the target flow; And dynamically adjusting ozone adding parameters according to the target flow and the real-time water quality parameters. By adopting the method, the comprehensive flow in the contact tank is not limited by the actual requirement of the tail end of the production line through a flow reflux compensation mechanism. Even under the low-load working condition, the single retention time of the water body can be shortened artificially by increasing the reflux quantity, and the problem that bromate exceeds standard caused by long-time exposure of the water body to ozone environment due to flow reduction is solved fundamentally. In one possible implementation manner, the obtaining the critical contact time period when the water body is contacted with ozone includes: establishing a working condition mapping table through experiments, calculating critical contact time length which does not exceed the bromate safety threshold under different water quality parameters, and recording the critical contact time length into the working condition mapping table; Acquiring real-time water quality parameters in the contact tank, wherein the real-time water quality parameters at least comprise pH value and water temperature; And inquiring the critical contact time length corresponding to the working condition mapping table according to the real-time water quality parameter. In one possible implementation,