Method for removing manganese and calcium using water quality clarifier

Abstract

To propose a system capable of simultaneously and completely removing manganese and calcium by using a water quality clarifier.SOLUTION: Provided herein is a means wherein, by dividing a treatment process in steps as described in fig. 1, included manganese and calcium can be removed completely, and by incorporating pH adjustment function to a water treatment agent, neutralization treatment of final treatment water is realized simultaneously.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to the removal of soluble manganese and calcium from raw water containing such substances by coagulation and sedimentation treatment using a water purification agent. [Background technology]

[0002] Up until now, methods such as alkaline precipitation, coagulation precipitation, and adsorption onto activated carbon have been used to remove manganese. Furthermore, methods such as precipitation removal using carbonate ions to form calcium carbonate have also been commonly used to remove calcium. Manganese turns brown when exposed to air, and calcium forms scale inside the facility, so it was necessary to remove it. However, when removing manganese and calcium simultaneously, there was a problem that pH control became complicated. Summary of the Invention [Problem to be solved by the invention]

[0003] Until now, simultaneous processing of manganese and calcium required separate equipment, and the facilities required were large.

[0004] Furthermore, the pH range for manganese precipitation is different from that for calcium precipitation, making management of this process complicated.

[0005] Furthermore, since neutralization treatment had to be carried out for each treatment, the amount of chemicals consumed was enormous.

[0006] Furthermore, sludge is discharged multiple times in each process, making collection difficult.

[0007] However, the water purification agent used in the present invention removes manganese and calcium in a series of treatment steps, making it possible to treat them in the same facility. [Means for solving the problem]

[0008] In this invention, by using the water purification agent and its derivative products as described in claim 1, it is possible to protect a wide range of manganese and calcium precipitation and achieve a high recovery rate.

[0009] That is, in the pretreatment stage, a pretreatment agent is used to mainly precipitate manganese, and then the first main treatment is carried out using a water purification agent to capture manganese in the flocs.

[0010] In this process, some of the precipitated calcium is also captured. Furthermore, by using the water purification agent again on the treated water after filtration, the agent's own pH adjusting ability can bring the pH to a level suitable for calcium precipitation, making it possible to capture and remove most of the calcium.

[0011] At this point, if the pH of the treated water is in the alkaline range, the water purifying agent of claim 1 can be used again to adjust it to the neutral range. This series of processing operations is carried out by batch processing. [Effects of the Invention]

[0012] According to the present invention, manganese and calcium can be removed in a short time. The chemicals used are safe, readily available, and readily available on the market. Furthermore, the specifications can be easily modified depending on the conditions of the raw water. [Brief explanation of the drawings]

[0013] [Figure 1] 1 is a flowchart showing processing steps. [Figure 2] The results of the examples are shown below. DETAILED DESCRIPTION OF THE INVENTION

[0014] Embodiments of the present invention will be described with reference to the drawings. It should be noted that the present invention is not limited to the following embodiments. The manganese and calcium removal method of the present invention can be used for any purpose, without particular limitation, as long as it is necessary to treat water to be treated that contains manganese and calcium. More specifically, the present invention can be used to remove manganese and calcium from water to be treated in various water treatment processes, such as water supply, industrial water treatment, sewage treatment, and wastewater treatment.

[0015] The flow chart of the actual treatment is shown in Figure 1. The raw water contained 64 mg / L of calcium and 1800 mg / L of manganese.

[0016] First, 100 to 3000 ppm of pretreatment agent is added to raw water and stirred to allow for a sufficient reaction.

[0017] Next, add 500 to 6,000 ppm of water purification agent (main treatment agent) and stir thoroughly. Flocs will form in the suspension, so filter it first.

[0018] Next, 500 to 6000 ppm of the water treatment agent (this treatment agent) is added again to the slightly diluted turbid liquid and thoroughly stirred. At this point, the treated liquid becomes transparent and large flocs form. Then, the treated liquid is filtered to obtain it.

[0019] Furthermore, 100 to 3000 ppm of post-treatment agent was added to the transparent treatment liquid and thoroughly stirred, yielding transparent treated water and a white precipitate.

[0020] After filtration, the manganese and calcium concentrations were tested, and the results shown in Figure 2 were obtained. [Industrial Applicability]

[0021] Manganese turns brown when oxidized, making water treatment difficult, and the possibility of respiratory irritation, coughing, and inflammation of lung tissue due to large-scale exposure cannot be ruled out. It has also been pointed out that large amounts of exposure to smoke, dust, or steam can lead to metal fever. Furthermore, because it turns brown when reacting with chlorine, it can react with hypochlorite in tap water and other sources, deteriorating the water quality.

[0022] The fact that manganese, which causes these problems, can be easily removed could also be used in water purification plants and for the reuse of industrial water.

[0023] In addition, by removing calcium, it is possible to prevent the formation of scale when water is reused, which in turn prevents calcium scale from forming in pipes, cooling towers, etc., making management easier and reducing management costs.

Claims

1. The coagulation method is characterized by using a water purification agent manufactured by Recovery Co., Ltd. (JP 2024-062310, Trademark: TREAT, Trademark Registration No. 6715719) as a water purification agent used to coagulate pollutants contained in industrial wastewater and industrial effluent, and purify the wastewater into a sedimentable state, thereby removing manganese and calcium contained therein.

2. A flocculation method characterized by: first adding and stirring the water purification agent of claim 1, which has been adjusted primarily for the purpose of adjusting the pH of the target water; then adding and stirring the water purification agent of claim 1, filtering the resultant; and then adding the water purification agent of claim 1 again to the filtrate, stirring the resultant, and filtering the resultant.

3. The method of claim 2, wherein the water purification agent has its own pH adjusting function.

4. A flocculation method characterized by removing manganese and calcium by the flocculation method of claims 1 to 3.

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