Plate and frame washing system for PHA

Abstract

The utility model discloses a plate frame washing system for PHA, which is characterized in that a process water storage tank is respectively connected with a washing tank, a squeezing water tank and a cloth washing tank, the washing tank, the squeezing water tank and the cloth washing tank are connected with a pipeline at one end of a plate frame filter, the other end of the plate frame filter is provided with a hydraulic group, and the bottom of the plate frame filter is connected with a drying system; and the dilute sulfuric acid storage tank and the material storage tank are respectively connected with the plate-and-frame filter through pipelines. According to the utility model, the washing tank, the squeezing water tank, the cloth washing tank and the plate and frame filter are connected to wash PHA-containing materials entering the plate and frame filter for multiple times, and meanwhile, the conductivity detector is arranged on the washing water output pipeline to detect the conductivity of washing water in real time and judge the washing condition timely and accurately.

Description

Technical Field

[0001] This utility model belongs to the field of filtration system technology, specifically relating to a plate and frame washing system for PHA. Background Technology

[0002] PHA (polyhydroxyalkanoates) is a storage particulate material synthesized by microorganisms under conditions of nutrient limitation and carbon surplus. It is also a biopolymer polyester compound with the characteristics of ordinary thermoplastic plastics, but unlike traditional petrochemical plastics, PHA has good biocompatibility, biodegradability, piezoelectricity, and optical activity, making it promising for applications in industry, agriculture, medicine, food, and other fields. In the fields of biodegradable agricultural mulch films, biodegradable plastic products, and medicine, PHA has shown great potential as the best biodegradable material currently available.

[0003] In the process of fermenting to produce PHA, the extracted mixture containing PHA needs to be separated and washed to retain the PHA. Plate and frame filters are generally used for separation and washing.

[0004] Chinese patent CN208193777U discloses an automated control plate and frame filter press washing water recovery device, including a plate and frame filter press. Its features include: a feed inlet connected to the plate and frame filter press via a feed inlet electric valve and a liquid pump; a washing water inlet connected to the plate and frame filter press via a washing water electric valve and a liquid pump; both the feed inlet and washing water electric valves are equipped with flow meters; a conductivity electrode is installed at the outlet of the plate and frame filter press; one end of a conductivity meter is connected to the conductivity electrode; the outlet of the plate and frame filter press is connected to a wastewater outlet via a wastewater outlet electric valve; the outlet of the plate and frame filter press is connected to a first recovery water tank via a first recovery water tank electric valve; and the outlet of the plate and frame filter press is connected to a second recovery water tank via a second recovery water tank electric valve. Different levels of washing water can be recovered by setting different conductivity values ​​on the computer control system as needed. It is simple to operate, safe and easy to understand, and reduces production costs and water resources by recovering washing water.

[0005] Chinese patent CN203408517U discloses an online soaking cleaning system for plate and frame filter presses. The system includes a plate and frame filter press and pipes and valves connected to it. It also includes a washing solution delivery pump and a washing solution regulating tank, with a steam heating pipe connected to the tank. The plate and frame filter press contains filter plates, with filter cloth placed between them. This system allows for adjustment of the cleaning solution concentration based on the oil content of the filter cloth, solving the problem of difficult cleaning of filter cloths in plate and frame filter presses with high oil content in slurry systems, thus broadening its applicability.

[0006] However, PHA fermentation broth and the resulting PHA-containing mixed solution after enzymatic hydrolysis contain a large number of impurities, requiring multiple washings. The washing results necessitate manual sampling and PHA content testing, which is inefficient, prone to errors and delays. This leads to inaccurate judgment of washing results on-site, affecting washing effectiveness and wasting water resources. Therefore, it is necessary to design a plate and frame washing system suitable for multiple PHA washings and capable of real-time monitoring of washing effects. Summary of the Invention

[0007] To address the aforementioned technical problems, this utility model provides a plate and frame washing system for PHA, which connects a washing tank, a pressing water tank, a cloth washing tank, and a plate and frame filter. The PHA-containing material entering the plate and frame filter is washed multiple times. At the same time, a conductivity meter is installed on the washing water output pipeline to detect the conductivity of the washing water in real time and to judge the washing status in a timely and accurate manner.

[0008] To achieve the above objectives, this utility model provides a plate and frame filter washing system for PHA, wherein the process water storage tank is connected to the washing tank, the pressing water tank and the cloth washing tank respectively, the washing tank, the pressing water tank and the cloth washing tank are connected to one end of the plate and frame filter press via pipelines, the other end of the plate and frame filter press is equipped with a hydraulic assembly, and the bottom is connected to the drying system; the dilute sulfuric acid storage tank and the material storage tank are respectively connected to the plate and frame filter press via pipelines.

[0009] Preferably, the plate and frame filter is connected to the concentrated wastewater transfer tank and the wastewater storage tank pipeline; the pipeline is equipped with a conductivity meter.

[0010] Preferably, the plate and frame filter is connected to the dilute sulfuric acid storage tank pipeline.

[0011] Preferably, the plate and frame filter is connected to the clear liquid transfer tank via pipeline, and the clear liquid transfer tank is connected to the material storage tank via pipeline.

[0012] More preferably, the bottom of the clear liquid transfer tank is equipped with a sewage discharge pipeline, which is connected to the sewage storage tank.

[0013] Preferably, the plate and frame filter is provided with a first pneumatic butterfly valve and a second pneumatic butterfly valve on both sides, and the first and second pneumatic butterfly valves are connected to the driving gas storage tank via pipelines.

[0014] Preferably, the washing tank is provided with a first drain valve; the pressing water tank is provided with a second drain valve; and the cloth washing tank is provided with a third drain valve.

[0015] More preferably, the first drain valve, the second drain valve, and the third drain valve are connected to the sewage storage tank via pipelines.

[0016] The beneficial effects of this utility model are as follows:

[0017] 1. Install a conductivity meter on the washing water output pipeline at the bottom of the plate and frame filter press to detect the conductivity of the washing water in real time, and reflect the washing status in a timely and accurate manner. When the conductivity is qualified, the washing can be stopped in time to avoid excessive water consumption due to over-washing, and also to avoid insufficient washing to put great pressure on subsequent processes.

[0018] 2. After initial utilization in the washing tank, pressing tank, and cloth washing tank, the material is conveyed to the plate and frame filter press for multiple washing processes, improving water utilization and washing efficiency. Simultaneously, wastewater from the washing tank, pressing tank, cloth washing tank, and plate and frame filter press is collected in a wastewater storage tank and can be recycled after further treatment in other processes.

[0019] 3. The clear liquid separated in the plate and frame filter press is stored in the clear liquid transfer tank, and then transported back to the plate and frame filter press for recycling through the material storage tank. This can not only concentrate and clean the material, but also recover the material and reduce material waste. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of this utility model. In the figure, 1 is a process water storage tank, 2 is a washing tank, 3 is a pressing water tank, 4 is a cloth washing tank, 5 is a plate and frame filter, 6 is a hydraulic assembly, 7 is a drying system, 8 is a clear liquid transfer tank, 9 is a dilute sulfuric acid storage tank, 10 is a material storage tank, 11 is a conductivity meter, 12 is a sewage storage tank, 13 is a concentrated sewage transfer tank, 14 is a driving gas storage tank, 15 is a first drain valve, 16 is a second drain valve, 17 is a third drain valve, 18 is a first pneumatic butterfly valve, and 19 is a second pneumatic butterfly valve. Detailed Implementation

[0021] The technical solution of this utility model will be further explained below with reference to the accompanying drawings and specific embodiments. It is worth noting that the following embodiments are only preferred embodiments of this utility model and should not be construed as limiting this utility model. The protection scope of this utility model should be determined by the content of the claims. Modifications or substitutions made by those skilled in the art to the technical solution of this utility model without creative effort all fall within the protection scope of this utility model.

[0022] Example 1

[0023] like Figure 1As shown, a plate and frame filter press system for PHA includes a process water storage tank 1 connected to a washing tank 2, a pressing water tank 3, and a cloth washing tank 4. These tanks are connected to one end of a plate and frame filter press 5 via pipelines, supplying washing water to the press for multiple washing of the material. A hydraulic assembly 6 is installed at the other end of the press to apply pressure to the material, achieving filter pressing. The bottom is connected to a drying system 7, which transports the filtered and washed material to the drying system for further processing. A dilute sulfuric acid storage tank 9 and a material storage tank 10 are connected to the plate and frame filter press 5 via pipelines, supplying dilute sulfuric acid and PHA-containing material to the press for continuous washing and production.

[0024] Preferably, the plate and frame filter 5 is connected to the concentrated wastewater transfer tank 13 and the wastewater storage tank 12 via pipelines to classify and store the wastewater separately for further processing or recycling. A conductivity meter 11 is installed on the pipeline to detect the conductivity of the washing water flowing out of the plate and frame filter 5 in real time, which helps to determine the degree of washing.

[0025] Preferably, the bottom of the plate and frame filter 5 is connected to the dilute sulfuric acid storage tank 9 via pipeline, so as to recycle the dilute sulfuric acid, improve the utilization rate, and reduce the cost.

[0026] Preferably, the plate and frame filter 5 is connected to the clear liquid transfer tank 8 by pipeline, and the clear liquid transfer tank 8 is connected to the material storage tank 10 by pipeline, so that the clear liquid containing PHA is transported to the material storage tank 10, and then filtered and washed again by the plate and frame filter 5, thereby reducing material waste.

[0027] More preferably, the bottom of the clear liquid transfer tank 8 is provided with a sewage discharge pipeline, which is connected to the sewage storage tank 12.

[0028] Preferably, the plate and frame filter 5 is provided with a first pneumatic butterfly valve 18 and a second pneumatic butterfly valve 19 on both sides. The first pneumatic butterfly valve 18 and the second pneumatic butterfly valve 19 are connected to the driving gas storage tank 14 via pipelines to deliver compressed gas into the plate and frame filter 5, which dries the material and accelerates the material falling, thereby improving the processing efficiency.

[0029] Preferably, the washing tank 2 is provided with a first drain valve 15; the pressing water tank 3 is provided with a second drain valve 16; and the cloth washing tank 4 is provided with a third drain valve 17, so as to discharge and store the wastewater in the washing tank 2, the pressing water tank 3 and the cloth washing tank 4 for processing in the next process or recycling, thereby improving the utilization rate of resources.

[0030] More preferably, the first drain valve 15, the second drain valve 16 and the third drain valve 17 are connected to the sewage storage tank 12 via pipelines.

Claims

1. A plate and frame washing system for PHA, characterized in that: The process water storage tank (1) is connected to the washing tank (2), the pressing water tank (3) and the cloth washing tank (4) respectively. The washing tank (2), the pressing water tank (3) and the cloth washing tank (4) are connected to one end of the plate and frame filter (5) by pipeline. The other end of the plate and frame filter (5) is equipped with a hydraulic assembly (6) and the bottom is connected to the drying system (7). The dilute sulfuric acid storage tank (9) and the material storage tank (10) are connected to the plate and frame filter (5) by pipeline respectively.

2. A plate and frame washing system for PHA according to claim 1, characterized in that: The plate and frame filter (5) is connected to the concentrated wastewater transfer tank (13) and the wastewater storage tank (12) via pipelines; a conductivity meter (11) is installed on the pipeline.

3. A plate and frame washing system for PHA according to claim 1, characterized in that: The plate and frame filter (5) is connected to the dilute sulfuric acid storage tank (9) via pipeline.

4. A plate and frame washing system for PHA according to claim 1, characterized in that: The plate and frame filter (5) is connected to the clear liquid transfer tank (8) by pipeline, and the clear liquid transfer tank (8) is connected to the material storage tank (10) by pipeline.

5. A plate and frame washing system for PHA according to claim 4, characterized in that: The bottom of the clear liquid transfer tank (8) is equipped with a sewage discharge pipeline, which is connected to the sewage storage tank (12).

6. A plate and frame washing system for PHA according to claim 1, characterized in that: The plate and frame filter (5) is provided with a first pneumatic butterfly valve (18) and a second pneumatic butterfly valve (19) on both sides. The first pneumatic butterfly valve (18) and the second pneumatic butterfly valve (19) are connected to the driving gas storage tank (14) via pipelines.

7. A plate and frame washing system for PHA according to claim 1, characterized in that: The washing tank (2) is equipped with a first drain valve (15); the pressing water tank (3) is equipped with a second drain valve (16); and the cloth washing tank (4) is equipped with a third drain valve (17).

8. A plate and frame washing system for PHA according to claim 7, characterized in that: The first drain valve (15), the second drain valve (16) and the third drain valve (17) are connected to the sewage storage tank (12) via pipelines.

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