Sludge reflux device for waste alkali oxidation production

Abstract

The utility model belongs to the technical field of sewage treatment, and discloses a sludge reflux device for waste alkali oxidation production, which comprises a feeding pipeline (1), a first machine pump (2), a concentration tank (6), a concentration reflux tank (8), a third machine pump (9), an overflow tank (11) and a membrane tank (12), an outlet of the first pump (2) is connected with a water inlet of the concentration tank (6) through a pipeline, and a control valve (13) is arranged on the pipeline for connecting the first pump (2) and the concentration tank (6); a water outlet of the concentration tank (6) is connected with a concentration backflow tank (8) through a pipeline; a third machine pump (9) is arranged in the concentration backflow tank (8); the third machine pump (9) is connected with a water inlet of an overflow pool (11) through a pipeline, and a water outlet of the overflow pool (11) is connected with a water inlet of a membrane pool (12). The content of impurities such as sludge is effectively reduced through multiple times of settling separation, the blockage condition of the membrane pool is delayed, the chemical and labor cost is reduced, and the effects of saving energy and reducing consumption are achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of sewage treatment, and in particular relates to a sludge reflow device used in waste alkali oxidation production. Background Art

[0002] In the existing waste alkali oxidation device sewage treatment, Siemens PACT+MBR process is mostly used. After the sewage passes through the anoxic tank, aerobic tank, and ceramic membrane group, it meets the discharge standards. Because the effluent from the biochemical pool in the existing process directly enters the membrane pool without a sedimentation process in the middle, a large amount of sludge is brought into the membrane pool (the concentration of activated sludge is 6000-9000mg / L, and the salt content is about 20000mg / L), causing serious blockage and leakage of the membrane. The membrane pool needs to be cut out frequently and chemical immersion cleaning and plugging work is carried out, which affects the operating load of the device and increases the cost of chemicals and labor. Utility Model Content

[0003] The technical problem to be solved by the utility model is that the effluent from the biochemical pool directly enters the membrane pool, causing serious blockage and leakage of the membrane. The membrane pool needs to be cut out frequently and chemical immersion cleaning and leak plugging work needs to be carried out, which affects the operating load of the device and increases the cost of chemicals and labor.

[0004] In order to solve the above technical problems, the specific technical solutions of the utility model are as follows:

[0005] A sludge return device for waste alkali oxidation production, comprising a feed pipeline 1, a first pump 2, a concentration tank 6, a concentration return tank 8, a third pump 9, an overflow tank 11 and a membrane tank 12;

[0006] The water outlet of the biochemical pool is connected to the inlet of the first pump 2 through the feed pipeline 1; the outlet of the first pump 2 is connected to the water inlet of the concentration pool 6 through a pipeline, and a control valve 13 is provided on the pipeline connecting the two; the water outlet of the concentration pool 6 is connected to the concentration return pool 8 through a pipeline, and a third pump 9 is provided in the concentration return pool 8; the third pump 9 is connected to the water inlet of the overflow pool 11 through a pipeline, and the water outlet of the overflow pool 11 is connected to the water inlet of the membrane pool 12.

[0007] The utility model has the following advantages: through multiple sedimentation separations, the content of impurities such as sludge is effectively reduced, the clogging of the membrane pool is delayed, the cost of chemicals and labor is reduced, and the effect of energy saving and consumption reduction is achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 This is a schematic diagram of the structure of the sludge return device of the utility model. DETAILED DESCRIPTION

[0009] In order to better understand the purpose, structure and function of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings.

[0010] like Figure 1 As shown, the sludge return device of this embodiment includes a feed pipeline 1, a first pump 2, a concentration tank 6, a concentration return tank 8, a third pump 9, an overflow tank 11 and a membrane tank 12.

[0011] The effluent from the biochemical pool enters the concentration pool 6 through the feed pipeline 1, the first pump 2, and the pipeline 5 through the control valve 13. After sedimentation, the upper clear liquid overflows to the pipeline 7 and enters the concentration return pool 8 for further sedimentation and separation. The clear liquid level enters the overflow pool 11 through the pipeline 10 through the third pump 9, and overflows into the membrane pool 12 through the overflow pool 11 to obtain a clearer liquid. Finally, the qualified water is separated by the membrane group and sent out. The second pump 3 and the return pipeline 4 are used as reflux.

[0012] This embodiment effectively reduces the content of impurities such as sludge through multiple sedimentation separations, delays the clogging of the membrane pool, reduces the cost of chemicals and labor, and plays a role in energy conservation and consumption reduction.

[0013] Before the renovation, the average soaking frequency of the four membrane pools was 10 times / month, and the citric acid required for soaking was 18 tons / month; after the renovation, the soaking frequency of the four membrane pools was reduced to 4 times / month, and the citric acid demand was reduced to 8 tons / month, saving 98,000 yuan / month in reagent costs. The chemical soaking time of the membrane pool was shortened from 720 hours / month to 288 hours / month, the operating time increased by 432 hours / month, and the wastewater treatment capacity increased by 2592m 3 .

[0014] 1. Comparison of citric acid dosage

[0015] 1. Citric acid required before transformation: 10 times / month*1.8t / time=18t / month

[0016] 2. Citric acid required after transformation: 4 times / month*2t / time=8t / month

[0017] 3. The average monthly citric acid cost savings before and after the transformation is about: (18-8)t / month*9800 yuan / ton=98,000 yuan / month

[0018] 2. Comparison of wastewater treatment volume before and after transformation

[0019] 1. The average chemical immersion frequency before the transformation is 10 times / month. Based on the immersion time of 72 hours / time, the total immersion time required is: 10 times / month*72 hours / time=720 hours / month

[0020] 2. After the transformation, the average monthly chemical immersion frequency is 4 times / month. Based on the immersion time of 72 hours / time, the total immersion time required is: 4 times / month*72 hours / time=288 hours / month

[0021] 3. Monthly wastewater treatment volume increased before and after the transformation: (Based on the average water output of four membrane pools 6m 3 / h calculation)

[0022] (720-288) hours / month*6m 3 / h=2592m 3 / moon

[0023] Although the embodiments of the present invention are described in conjunction with the accompanying drawings, those skilled in the art may make several modifications and improvements without departing from the principle of the present invention, and these modifications and improvements should also be considered to belong to the protection scope of the present invention.

Claims

1. A sludge reflow device for waste alkali oxidation production, characterized in that: It comprises a feed pipeline (1), a first pump (2), a concentration tank (6), a concentration return tank (8), a third pump (9), an overflow tank (11) and a membrane tank (12); The water outlet of the biochemical pool is connected to the inlet of the first pump (2) through a feed pipeline (1); the outlet of the first pump (2) is connected to the water inlet of the concentration pool (6) through a pipeline, and a control valve (13) is arranged on the pipeline connecting the two; the water outlet of the concentration pool (6) is connected to the concentration return pool (8) through a pipeline, and a third pump (9) is arranged in the concentration return pool (8); the third pump (9) is connected to the water inlet of the overflow pool (11) through a pipeline, and the water outlet of the overflow pool (11) is connected to the water inlet of the membrane pool (12).

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