CN-121342280-B - Natural mineral water pretreatment method and system

Abstract

The invention relates to the field of natural mineral water quality purification, in particular to a natural mineral water pretreatment method and a natural mineral water pretreatment system. The method comprises the steps of carrying out saturated aeration treatment on mineral water, detecting the pH value and manganese ion content of the mineral water after the aeration treatment, increasing the pH value of the mineral water to a first target pH value according to the pH value and manganese ion content of the mineral water after the aeration treatment, carrying out secondary demanganization treatment under the first target pH value, removing iron and manganese precipitates in the mineral water after the secondary demanganization, injecting carbon dioxide into the mineral water after the precipitation removal, adjusting the pH value, and adjusting the pH value of the mineral water to a second target pH value. The invention removes iron and manganese ions through saturated aeration treatment, then further increases the pH value, further accelerates the removal of manganese, removes iron and manganese precipitates, then returns the pH value through injecting carbon dioxide, returns the mineral water to a normal pH value interval through pH value compensation and return, and is convenient for subsequent further fine treatment.

Inventors

• HAO XIAOWEI
• DUAN LIAN
• ZHANG CAIZHEN
• CHEN XIAOZHAN
• WEI ZHENSHAN
• ZHANG JUN
• XU QINGHE
• LIAO JIANSHENG

Assignees

• 乐百氏(广东)饮用水有限公司

Dates

Publication Date

20260505

Application Date

20251217

Claims (7)

1. 1. A method for pretreatment of natural mineral water, comprising: Carrying out saturated aeration treatment on mineral water; detecting the pH value and the manganese ion content of mineral water after aeration treatment; according to the pH value and manganese ion content of the mineral water after aeration treatment, the pH value of the mineral water is increased to a first target pH value, and secondary demanganization treatment is carried out at the first target pH value; removing iron and manganese precipitates in the mineral water subjected to secondary demanganization; injecting carbon dioxide into the mineral water after removing the sediment, adjusting the pH value, and adjusting the pH value of the mineral water to a second target pH value; Wherein, according to the pH value and manganese ion content of the mineral water after aeration treatment, the step of increasing the pH value of the mineral water to the first target pH value comprises the following steps: according to the pH value of the mineral water after aeration treatment, combining a first target pH value to obtain a first alkaline auxiliary material throwing value; obtaining an acidic neutralization consumption value according to the manganese ion content and the mineral water quantity; acquiring a second alkaline auxiliary material feeding value according to the first alkaline auxiliary material feeding value and the acidic neutralization consumption value; and controlling an alkaline auxiliary material throwing valve to throw in the alkaline auxiliary material according to the second alkaline auxiliary material throwing value.
2. 2. The method for pretreatment of natural mineral water as claimed in claim 1, wherein said subjecting the mineral water to the saturation aeration treatment comprises injecting clean air into the mineral water by spraying, waterfall or blowing from the bottom of the water flow so that oxygen in the clean air is sufficiently dissolved into the mineral water.
3. 3. The method for pretreatment of natural mineral water as claimed in claim 1, wherein the manganese ion content is obtained by an on-line manganese ion analyzer.
4. 4. The method of pretreatment of natural mineral water of claim 1, wherein said secondary demanganization at a first target pH further comprises: the feedback pH value is further obtained at the downstream of the alkaline auxiliary material throwing valve; And according to the feedback pH value, the alkaline auxiliary material adding amount is regulated by combining the first target pH value.
5. 5. The method for pretreatment of natural mineral water as claimed in claim 1, wherein said removing the iron-manganese precipitate in the secondary demanganized mineral water comprises: And controlling the mineral water subjected to secondary demanganization to pass through a manganese sand filter tank.
6. 6. The method for pretreatment of natural mineral water according to claim 1, wherein said injecting carbon dioxide into said mineral water after removing said precipitate, and adjusting pH comprises: controlling the water inlet of the venturi mixer to be injected into the mineral water subjected to secondary demanganization; Injecting a pure positive pressure carbon dioxide gas stream from the venturi of the venturi mixer; and discharging mineral water with the pH value adjusted back from a water outlet of the Venturi mixer.
7. 7. The method for pretreatment of natural mineral water according to claim 4, wherein said alkaline auxiliary material is sodium carbonate solution.

Description

Natural mineral water pretreatment method and system Technical Field The invention relates to the field of natural mineral water quality purification, in particular to a natural mineral water pretreatment method and a natural mineral water pretreatment system. Background The pH value of natural mineral water source is greatly different, and the natural mineral water source can be from 6.5 to 8.5. In the prior art, ferric oxide ions, manganese ions and manganese sand are filtered and removed in the pretreatment stage of a water source through an aeration process, and the process lacks pertinency to the pH value of the water source, so that the following defects are generated: When the pH value of the dissolved ferrous ions is 6.0, the oxidation rate is very fast, and the oxidation can be basically completed by aeration. However, manganese has a strong pH dependence, and the oxidation rate of divalent manganese ions has a very strong pH dependence, and the oxidation rate can be significantly increased only when the pH is raised to about 8.0. Therefore, for neutral or weak acid water sources, the pH value of the water source is 6.5-7.2, the oxidation condition provided by one aeration is far insufficient for thoroughly oxidizing the divalent manganese ions. A large amount of unoxidized divalent manganese ions can penetrate through the manganese sand filter layer, so that the manganese in the effluent exceeds the standard, or the unoxidized manganese ions are slowly oxidized in the pipeline, so that secondary precipitation and pipeline pollution are formed. Moreover, the pH of natural water sources may fluctuate with seasons, rainfall, or depth of water pumping. When the source pH fluctuates down (e.g., from 7.5 to 6.8), the system lacks countermeasures and the efficiency of manganese removal drops dramatically. Because the water entering the manganese sand filter tank still contains a large amount of unoxidized divalent manganese ions, the ions continuously consume the active manganese dioxide oxide layer on the surface of the manganese sand filter material, so that the catalytic capability of the filter material is rapidly reduced, namely, the filter material is deactivated. Chemical regeneration of potassium permanganate must be performed more frequently, which not only increases operating costs, but also creates additional chemical waste disposal problems. Disclosure of Invention In order to solve the above problems, an embodiment of the present application provides a natural mineral water pretreatment method. The method comprises the following steps: Carrying out saturated aeration treatment on mineral water; detecting the pH value and the manganese ion content of mineral water after aeration treatment; according to the pH value and manganese ion content of the mineral water after aeration treatment, the pH value of the mineral water is increased to a first target pH value, and secondary demanganization treatment is carried out at the first target pH value; removing iron and manganese precipitates in the mineral water subjected to secondary demanganization; Injecting carbon dioxide into the mineral water after removing the precipitate, adjusting the pH value, and adjusting the pH value of the mineral water to a second target pH value. According to the natural mineral water pretreatment method provided by the embodiment of the application, the iron and manganese ions are removed through aeration treatment, then the pH value is further increased, the removal of manganese is further accelerated, the pH value is adjusted back through injecting carbon dioxide after removing the iron and manganese precipitate, so that mineral water returns to an optimal taste interval, the iron and manganese ions, particularly manganese ions, can be repeatedly removed in the pretreatment stage, and the mineral water returns to a normal pH value interval through pH value compensation adjustment, so that the follow-up further fine treatment is facilitated. In one possible implementation manner, the saturated aeration treatment of the mineral water includes injecting clean air into the mineral water through spraying, waterfall or blowing from the bottom of the water flow, so that oxygen in the clean air is fully dissolved into the mineral water. In one possible implementation, the detecting the pH value and the manganese ion content of the aerated mineral water includes obtaining by an online manganese ion analyzer. In one possible implementation manner, the increasing the pH of the mineral water to the first target pH value according to the pH value and the manganese ion content of the mineral water after the aeration treatment includes: According to the pH value of the mineral water after aeration treatment, combining a first target pH value and manganese ions to obtain a first alkaline auxiliary material throwing value; obtaining an acidic neutralization consumption value according to the manganese ion combined mineral water con