High-hardness sewage treatment system

Abstract

A high-hardness sewage treatment system comprises a pH adjusting tank, a sewage input pipe and an alkaline matter input pipe are arranged at the top of the pH adjusting tank, a sewage conveying pump is arranged on the sewage input pipe, an output pipeline of the adjusting tank is connected to a first plate-and-frame filter press, an output pipeline of the first plate-and-frame filter press is connected to a filtrate buffer tank, and the filtrate buffer tank is connected to a second plate-and-frame filter press. An output pipeline of the filtrate buffer tank is connected to the softening tank, an output pipeline of the softening tank is connected to the second plate-and-frame filter press, and an output pipeline of the second plate-and-frame filter press is connected to the clean water tank; and a carbon dioxide input pipeline is also arranged on the softening tank. By adopting the structure, the content of calcium and magnesium in sewage can be adjusted to the discharge standard under the conditions of normal temperature and normal pressure, high-concentration acid and alkali are not generated in the process, the requirements on the structure, the material and the operation of equipment are low, the sewage treatment cost is further reduced, and the service life of the system equipment is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of sewage treatment, in particular to a high-hardness sewage treatment system. Background Art

[0002] With the development of industry, the discharge of high-hardness wastewater is increasing. Calcium and magnesium ions are often the main ionic components in high-hardness wastewater. The presence of these ions may affect the chemical properties of the water, thereby affecting the process of eutrophication. High-hardness wastewater usually comes from various sources, such as industrial wastewater discharge and groundwater infiltration.

[0003] The current method of treating high-hardness sewage is generally carried out under high temperature and high pressure conditions, and the treatment process involves high concentrations of acid and alkali. On the one hand, it leads to an increase in treatment operation costs, and on the other hand, it is easy to cause corrosion damage to pipeline equipment, affecting the life of the sewage treatment system. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a high-hardness sewage treatment system, which can adjust the calcium and magnesium content in sewage to the emission standard under normal temperature and pressure conditions, and there is no high concentration of acid and alkali in the process. The requirements for the structure, material and operation of the equipment are low, thereby reducing the sewage treatment cost and extending the service life of the system equipment.

[0005] In order to solve the above technical problems, the technical solution adopted by the utility model is: a high-hardness sewage treatment system, including a pH regulating tank, a sewage input pipe and an alkaline substance input pipe are provided on the top of the pH regulating tank, a sewage delivery pump is provided on the sewage input pipe, an output pipe of the regulating tank is connected to a first plate-frame filter press, an output pipe of the first plate-frame filter press is connected to a filtrate buffer tank, an output pipe of the filtrate buffer tank is connected to a softening tank, an output pipe of the softening tank is connected to a second plate-frame filter press, and an output pipe of the second plate-frame filter press is connected to a clear water tank;

[0006] The softening tank is also provided with a carbon dioxide input pipeline.

[0007] In a preferred solution, a first-stage slurry delivery pump is provided on the output pipeline of the regulating tank.

[0008] In a preferred solution, a filtrate delivery pump is provided on the output pipeline of the filtrate buffer tank.

[0009] In a preferred solution, a secondary slurry delivery pump is provided on the output pipe of the softening tank.

[0010] In a preferred solution, the clean water tank is further provided with a clean water output pipe, and the clean water output pipe is provided with a clean water pump.

[0011] In a preferred solution, a stirring mechanism is provided in the pH adjustment tank.

[0012] In a preferred embodiment, an "S"-shaped baffle channel is formed in the softening tank by a plurality of partitions, and the carbon dioxide input pipe penetrates from the bottom of the softening tank side wall and is arranged on the bottom surface of the baffle channel.

[0013] The high-hardness sewage treatment system provided by the utility model has the following beneficial effects by adopting the above structure:

[0014] (1) The sewage treatment process does not involve high temperature and high pressure processes, and there is no high concentration of acid and alkali. The requirements for equipment structure, material, and operation are relatively low, ensuring the safety of the production environment;

[0015] (2) The slag produced during the operation of the device can be used as raw material for fertilizer, thus realizing resource utilization;

[0016] (3) Carbon dioxide can be obtained from industrial waste gas at a relatively low cost, which not only reduces carbon dioxide emissions but also reduces dependence on expensive chemical reagents. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0018] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0019] In the figure: sewage delivery pump 1, pH adjustment tank 2, primary slurry delivery pump 3, first plate and frame filter press 4, filtrate buffer tank 5, filtrate delivery pump 6, softening tank 7, secondary slurry delivery pump 8, second plate and frame filter press 9, clear water tank 10, clear water pump 11. DETAILED DESCRIPTION

[0020] like Figure 1 A high-hardness sewage treatment system includes a pH regulating tank 2, a sewage input pipe and an alkaline substance input pipe are provided on the top of the pH regulating tank 2, a sewage delivery pump 1 is provided on the sewage input pipe, an output pipe of the regulating tank 2 is connected to a first plate-frame filter press 4, an output pipe of the first plate-frame filter press 4 is connected to a filtrate buffer tank 5, an output pipe of the filtrate buffer tank 5 is connected to a softening tank 7, an output pipe of the softening tank 7 is connected to a second plate-frame filter press 9, and an output pipe of the second plate-frame filter press 9 is connected to a clear water tank 10;

[0021] The softening tank 7 is also provided with a carbon dioxide input pipeline.

[0022] In a preferred solution, a first-stage slurry delivery pump 3 is provided on the output pipeline of the regulating tank 2 .

[0023] In a preferred solution, a filtrate delivery pump 6 is provided on the output pipe of the filtrate buffer tank 5 .

[0024] In a preferred solution, a secondary slurry delivery pump 8 is provided on the output pipe of the softening tank 7 .

[0025] In a preferred solution, the clean water tank 10 is further provided with a clean water output pipe, and the clean water output pipe is provided with a clean water pump 11.

[0026] In a preferred solution, a stirring mechanism is provided in the pH regulating tank 2 .

[0027] In a preferred embodiment, an "S"-shaped baffle channel is formed in the softening tank 7 by a plurality of partitions, and the carbon dioxide input pipe penetrates from the bottom of the side wall of the softening tank 7 and is arranged on the bottom surface of the baffle channel.

[0028] The high-hardness sewage treatment system disclosed in this novel invention includes two steps of pH adjustment and softening.

[0029] The pH adjustment is as follows:

[0030] The sewage is transported to the pH adjustment tank 2 by the sewage pump 1, and alkaline substances are added at the same time to adjust the pH of the sewage to ≥12. After stirring evenly, the sewage is reacted for 30 to 60 minutes. After the reaction, a slurry is obtained. The slurry is pumped into the first plate and frame filter press 4 through the first-level slurry pump 3 for pressure filtration and separation. The filtrate enters the filtrate buffer tank 5. The filter residue can be used to make fertilizer.

[0031] The alkaline substance introduced into the pH regulating tank 2 is at least one of calcium hydroxide, calcium oxide, carbide slag and sodium hydroxide. If sodium hydroxide is selected, it can be prepared into a low-concentration solution for reuse.

[0032] Softening is specifically:

[0033] The filtrate in the filtrate buffer tank 5 is transported to the softening tank 7 by the filtrate delivery pump 6, and then CO2 is introduced into the softening tank 7 until the pH of the sewage is neutral. The slurry obtained after the reaction is transported by the secondary slurry delivery pump 8 to the second plate and frame filter press 9 for pressure filtration separation. The clean water obtained by pressure filtration enters the clean water tank 10. The filter residue can be used to make fertilizers. The clean water can be reused or discharged through the clean water pump 11 according to process requirements.

[0034] During the above process, the reaction temperature in the pH adjustment tank 2 and the softening tank 7 is 10-35°C.

Claims

1. A high-hardness sewage treatment system, characterized by: The pH regulating tank (2) comprises a sewage input pipe and an alkaline substance input pipe provided on the top of the pH regulating tank (2), a sewage delivery pump (1) provided on the sewage input pipe, an output pipe of the regulating tank (2) being connected to a first plate-frame filter press (4), an output pipe of the first plate-frame filter press (4) being connected to a filtrate buffer tank (5), an output pipe of the filtrate buffer tank (5) being connected to a softening tank (7), an output pipe of the softening tank (7) being connected to a second plate-frame filter press (9), and an output pipe of the second plate-frame filter press (9) being connected to a clear water tank (10); The softening tank (7) is also provided with a carbon dioxide input pipeline.

2. A high-hardness sewage treatment system according to claim 1, characterized in that: A first-stage slurry delivery pump (3) is provided on the output pipe of the regulating tank (2).

3. A high-hardness sewage treatment system according to claim 1, characterized in that: A filtrate delivery pump (6) is provided on the output pipe of the filtrate buffer tank (5).

4. A high-hardness sewage treatment system according to claim 1, characterized in that: A secondary slurry delivery pump (8) is provided on the output pipe of the softening tank (7).

5. A high-hardness sewage treatment system according to claim 1, characterized in that: The clean water tank (10) is also provided with a clean water output pipe, and the clean water output pipe is provided with a clean water pump (11).

6. A high-hardness sewage treatment system according to claim 1, characterized in that: A stirring mechanism is provided in the pH regulating tank (2).

7. A high-hardness sewage treatment system according to claim 1, characterized in that: An "S"-shaped baffle channel is formed in the softening tank (7) by a plurality of partitions, and a carbon dioxide input pipe penetrates from the bottom of the side wall of the softening tank (7) and is arranged on the bottom surface of the baffle channel.

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