Device for reducing turbidity, removing hardness and recycling sewage of industrial circulating water system

Abstract

The utility model discloses a turbidity-reducing hardness-removing recycling device for sewage of an industrial circulating water system, and belongs to the field of industrial circulating water. The device comprises a blow-down water collecting tank, a blow-down water lifting pump, a first-stage bag type filter and a second-stage bag type filter, an outlet of the blow-down water collecting pool is connected with a blow-down water lifting pump, the blow-down water lifting pump is sequentially connected with a lifting pump outlet valve, a primary bag type filter inlet Y-shaped filter screen and a primary bag type filter, and a front sampling guide shower and an inlet in-situ pressure gauge are arranged on a connecting pipeline of the primary bag type filter inlet Y-shaped filter screen and the primary bag type filter; the first-stage bag filter is connected with a second-stage bag filter, an outlet local pressure gauge is arranged on a lower outlet header pipe on the side of the second-stage bag filter, two branch pipes are extended, and one branch pipe is connected with an outlet valve and an outlet flow meter; and the other branch pipe is connected with the outlet reflux valve. According to the utility model, the problem that the turbidity and the hardness of industrial circulating cooling water running at a high concentration rate are uncontrollable is solved; and water and energy are saved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of industrial circulating water system sewage water turbidity reduction and hardness removal recycling device, belong to industrial circulating water field. BACKGROUND

[0002] In order to prevent and control the fouling and corrosion of industrial circulating cooling water system, it is generally controlled to run at low concentration ratio, which not only wastes a large amount of fresh water, but also produces a large amount of sewage. Therefore, a large amount of research and development work has been carried out around the research direction of controlling the high concentration ratio operation of industrial circulating cooling water system at home and abroad, and many different formulations of circulating water corrosion inhibitors and scale inhibitors have been produced, but the use of the additive will bring the following problems: the turbidity and hardness of the high concentration ratio operation of industrial circulating cooling water system are uncontrollable, and there is a risk of fouling. SUMMARY

[0003] In order to overcome the above shortcomings, the utility model provides a kind of industrial circulating water system sewage water turbidity reduction and hardness removal recycling device, especially suitable for controlling the high concentration ratio operation of industrial circulating cooling water system.

[0004] The utility model carries out appropriate sewage operation on the high concentration ratio operation of industrial circulating cooling water system, and adopts the method of turbidity reduction and hardness removal to treat sewage, and uses treated water as make-up water for industrial circulating cooling water system, so that the turbidity and hardness indexes of the high concentration ratio operation of industrial circulating cooling water system can be stably controlled. The above-mentioned appropriate sewage operation on industrial circulating cooling water system is to take out a part of high-turbidity high-hardness water from the system and collect it, and then pump it into two-stage bag filter through sewage lifting pump for turbidity reduction and hardness removal treatment, and the treated water is returned to industrial circulating cooling water system for continuous use.

[0005] The technical scheme adopted by the utility model is:

[0006] A kind of industrial circulating water system sewage water turbidity reduction and hardness removal recycling device, including sewage collection tank, sewage lifting pump, primary bag filter, secondary bag filter;

[0007] The blowdown water collecting tank is used for collecting industrial circulating cooling water blowdown water, the outlet of the blowdown water collecting tank is connected with a blowdown water lifting pump, the outlet pipe of the blowdown water lifting pump is connected with a lifting pump outlet valve, a primary bag filter inlet Y-shaped filter screen and a primary bag filter in sequence, a primary bag filter front sampling guide is arranged on the connecting pipeline between the primary bag filter inlet Y-shaped filter screen and the primary bag filter, and a primary bag filter inlet on-site pressure gauge is arranged; the side lower outlet pipe of the primary bag filter is directly connected with the side upper inlet pipe of a secondary bag filter through a pipeline, a secondary bag filter outlet on-site pressure gauge and a secondary bag filter rear sampling guide are arranged on the secondary bag filter side lower outlet main pipe, two branch pipes are branched out, one branch pipe is connected with a secondary bag filter outlet valve and a secondary bag filter outlet flow meter, and the other branch pipe is connected with a secondary bag filter outlet backflow valve.

[0008] Further, the connection mode of the primary bag filter and the secondary bag filter is in series, and the filter bag precision of the primary bag filter and the secondary bag filter is 10 microns. The outlet of the primary bag filter is arranged on the lower side of the filter and is directly connected with the inlet of the secondary bag filter; and the inlet of the secondary bag filter is arranged on the upper side of the filter.

[0009] Further, the primary bag filter is provided with a Y-shaped filter screen, an inlet on-site pressure gauge and a sampling guide.

[0010] Further, the secondary bag filter is provided with an outlet on-site pressure gauge, a sampling guide, an outlet valve, an outlet backflow valve and an outlet flow meter.

[0011] Further, the outlet pipe of the blowdown water lifting pump is provided with a lifting pump outlet valve, and the flow of the secondary bag filter outlet flow meter is jointly adjusted by adjusting the opening degrees of the valves of the lifting pump outlet valve, the secondary bag filter outlet valve and the secondary bag filter outlet backflow valve.

[0012] Further, in order to prevent the blowdown water lifting pump from sucking the precipitated suspended matter, the height of the water inlet of the blowdown water lifting pump is greater than or equal to 1 meter from the bottom of the blowdown water collecting tank.

[0013] Further, the inlet and outlet pressure difference of the two-stage bag filter is less than or equal to 0.3 MPa; the pressure of the primary bag filter is controlled within 0.5-0.6 MPa, and the pressure of the secondary bag filter is controlled within 0.3-0.4 MPa.

[0014] This utility model provides an industrial circulating water system wastewater turbidity and hardness removal and reuse device. It collects wastewater from industrial circulating cooling water systems and pumps it sequentially through a primary bag filter and a secondary bag filter for turbidity and hardness removal. The treated water, after being metered by a flow meter, is reused as makeup water for the industrial circulating cooling water system. Under high concentration ratio operating conditions, the wastewater from industrial circulating cooling water systems, after turbidity and hardness removal treatment, can achieve a turbidity degradation rate of over 5% and a hardness degradation rate of over 50%. Returning the wastewater to the industrial circulating cooling water system for continued use not only stabilizes the turbidity and hardness indicators of the industrial circulating cooling water system but also achieves the goals of wastewater reuse and water and energy conservation.

[0015] The industrial circulating water system wastewater turbidity reduction and hardness removal reuse device provided by this utility model has the following beneficial effects:

[0016] (1) The turbidity and hardness removal and reuse device solves the problem of uncontrollable turbidity and hardness in industrial circulating cooling water systems operating at high concentration ratios;

[0017] (2) After turbidity reduction and hardness removal, the wastewater discharged from the industrial circulating cooling water system is reused as makeup water for the circulating water system, realizing water reuse and water and energy saving;

[0018] (3) It has the practicality of low investment, small footprint and easy operation.

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of this utility model.

[0021] In the diagram: 1 is the sewage collection tank, 2 is the sewage lift pump, 3 is the lift pump outlet valve, 4 is the Y-type filter screen at the inlet of the primary bag filter, 5 is the sampling drain before the primary bag filter, 6 is the local pressure gauge at the inlet of the primary bag filter, 7 is the primary bag filter; 8 is the secondary bag filter, 9 is the local pressure gauge at the outlet of the secondary bag filter, 10 is the sampling drain after the secondary bag filter, 11 is the outlet valve of the secondary bag filter, 12 is the outlet return valve of the secondary bag filter, and 13 is the outlet flow meter of the secondary bag filter. Detailed Implementation

[0022] like Figure 1 As shown, this utility model provides an industrial circulating water system wastewater turbidity reduction and hardness removal reuse device, including: wastewater collection tank 1, wastewater lift pump 2, primary bag filter 7, and secondary bag filter 8, with each device connected by pipelines.

[0023] The utility model discloses a sewage water collecting pool 1 is set up in the ground, and the length of the sewage water collecting pool 1 is greater than or equal to 20 meters, the width is greater than or equal to 20 meters, and the height is greater than or equal to 8 meters, which is beneficial to the standing precipitation of insoluble salt in the circulating water sewage.

[0024] The specific settings of the devices in the embodiment are as follows:

[0025] The sewage water collecting pool 1 is set up in the ground, and the length of the sewage water collecting pool 1 is greater than or equal to 20 meters, the width is greater than or equal to 20 meters, and the height is greater than or equal to 8 meters, which is beneficial to the standing precipitation of insoluble salt in the circulating water sewage.

[0026] The sewage water collecting pool 1 is set up in the ground, and the length of the sewage water collecting pool 1 is greater than or equal to 20 meters, the width is greater than or equal to 20 meters, and the height is greater than or equal to 8 meters, which is beneficial to the standing precipitation of insoluble salt in the circulating water sewage.

[0027] The sewage water collecting pool 1 is set up in the ground, and the length of the sewage water collecting pool 1 is greater than or equal to 20 meters, the width is greater than or equal to 20 meters, and the height is greater than or equal to 8 meters, which is beneficial to the standing precipitation of insoluble salt in the circulating water sewage.

[0028] The outlet pipeline of the secondary bag filter outlet backflow valve 12 is arranged above the liquid level of the blowdown water collecting tank 1 to prevent backflow from bringing insoluble salts and impurities at the bottom to the water inlet of the blowdown water lifting pump 2.

[0029] The operation process of the device is as follows:

[0030] (1) Firstly, the circulation of the blowdown water collecting tank, the blowdown water lifting pump, the primary bag filter and the secondary bag filter is established: after the industrial circulating cooling water blowdown water enters the blowdown water collecting tank, the flow of the blowdown water rapidly becomes zero, which is beneficial to the precipitation of the undissolved calcium salt and suspended matter in the blowdown water to the bottom of the blowdown water collecting tank, so that the turbidity and hardness are preliminarily reduced. The outlet valve of the lifting pump, the secondary bag filter outlet backflow valve are opened, and the secondary bag filter outlet valve is closed, so that the circulation of the blowdown water collecting tank-blowdown water lifting pump-lifting pump outlet valve-primary bag filter inlet Y-shaped filter screen-primary bag filter-secondary bag filter-secondary bag filter outlet backflow valve is established.

[0031] (2) After one hour of operation, sampling analysis is performed through the sampling guide pipes before and after the primary bag filter and the secondary bag filter; sampling is performed through the sampling guide pipe before the primary bag filter, and the COD in the sampling guide pipe / COD in the circulating water is required to be less than 1.5.

[0032] If the COD in the sampling guide pipe before the primary bag filter / COD in the circulating water is greater than or equal to 1.5, it is needed to check whether other high-COD water is mixed into the water in the blowdown water collecting tank, and at this time, the water in the blowdown water collecting tank is prohibited from being transported to the circulating water tank through the blowdown water lifting pump, the primary bag filter and the secondary bag filter.

[0033] If the COD in the sampling guide pipe before the primary bag filter / COD in the circulating water is less than 1.5, the sampling guide pipe after the secondary bag filter is detected, ① when the turbidity of the circulating water blowdown water-the turbidity of the sampling guide pipe after the secondary bag filter / the turbidity of the circulating water blowdown water is greater than or equal to 5%, or the hardness of the circulating water blowdown water-the hardness of the sampling guide pipe after the secondary bag filter / the hardness of the circulating water blowdown water is greater than or equal to 50% (one of the two conditions is met), the secondary bag filter outlet valve is opened, and the water in the blowdown water collecting tank is transported to the circulating water tank through the blowdown water lifting pump, the primary bag filter and the secondary bag filter; ② when the turbidity of the circulating water blowdown water-the turbidity of the sampling guide pipe after the secondary bag filter / the turbidity of the circulating water blowdown water is less than 5%, and the hardness of the circulating water blowdown water-the hardness of the sampling guide pipe after the secondary bag filter / the hardness of the circulating water blowdown water is less than 50%, it is needed to check whether the filter bags of the primary bag filter and the secondary bag filter are damaged, and if damaged, the filter bags need to be replaced in time, and after the replacement is completed, the operations of (1) and (2) are repeated.

[0034] COD in circulating water, turbidity of circulating water blowdown, hardness of circulating water blowdown, water quality of water added in circulating water during operation, scale inhibitor added in circulating water, bactericide and algicide are related. COD in circulating water, turbidity of circulating water, hardness of circulating water are controlled within a certain range according to relevant requirements. In order to ensure the effect of reducing turbidity and hardness of circulating water, the following methods are used for control:

[0035] 1. COD in blowdown water collecting tank / COD in circulating water < 1.5; water in blowdown water collecting tank is prohibited from mixing with other sewage. COD in blowdown water collecting tank is sampled and detected once a day. If COD in blowdown water collecting tank / COD in circulating water ≥ 1.5, it is needed to check whether other sewage with high COD is mixed in. Water in blowdown water collecting tank is prohibited from being transported to circulating water tank through blowdown water lifting pump, primary bag filter and secondary bag filter.

[0036] 2. In blowdown water collecting tank, water inlet of blowdown water lifting pump 2 is ≥ 1 meter away from the bottom of blowdown water collecting tank.

[0037] 3. Liquid level in blowdown water tank is greater than 1 meter higher than water inlet of blowdown water lifting pump 2.

[0038] 4. Before water in blowdown water collecting tank is fed into circulating water, outlet valve of lifting pump, outlet backflow valve of secondary bag filter are opened, outlet valve of secondary bag filter is closed, and blowdown water collecting tank-blowdown water lifting pump-lifting pump outlet valve-primary bag filter inlet Y-shaped filter screen-primary bag filter-secondary bag filter-secondary bag filter outlet backflow valve circulation is established. After one hour of operation, sampling and analysis are conducted through pre-sampling guide of primary bag filter and post-sampling guide of secondary bag filter.

[0039] 5. According to the analysis results, the following operations are conducted. If COD in pre-sampling guide of primary bag filter / COD in circulating water ≥ 1.5, it is needed to check whether other sewage with high COD is mixed in. If COD in pre-sampling guide of primary bag filter / COD in circulating water < 1.5, and (turbidity of circulating water blowdown-turbidity of post-sampling guide of secondary bag filter) / turbidity of circulating water blowdown < 5%, (hardness of circulating water blowdown-hardness of post-sampling guide of secondary bag filter) / hardness of circulating water blowdown < 50%, it is needed to check primary bag filter and secondary bag filter whether damaged, and it is needed to be replaced in time. If COD in pre-sampling guide of primary bag filter / COD in circulating water < 1.5, and (turbidity of circulating water blowdown-turbidity of post-sampling guide of secondary bag filter) / turbidity of circulating water blowdown ≥ 5%, or (hardness of circulating water blowdown-hardness of post-sampling guide of secondary bag filter) / hardness of circulating water blowdown ≥ 50% (one of the two is met), outlet valve of secondary bag filter is opened, and water is fed into circulating water tank.

[0040] Primary bag filter, secondary bag filter filter bag needs regular inspection or replacement, regular inspection or replacement is completed, re-performs confirmation according to steps 1-5 above.

[0041] The blowdown of the circulating water system is performed in a continuous blowdown or intermittent blowdown mode. The concentration multiple is calculated based on potassium ions in water, circulating water potassium ion solubility / raw water potassium ion solubility = circulating water concentration multiple. The circulating water blowdown requires a concentration multiple greater than 8. When the circulating water concentration multiple is ≥10, the circulating water adopts continuous blowdown; when the circulating water concentration multiple is between 8-10, the circulating water adopts intermittent blowdown; when the circulating water concentration multiple is ≤8, the circulating water does not blow down. The circulating water blowdown water enters the sewage collection tank, and mixing with other blowdown water is prohibited to prevent the increase of the COD content of the water in the sewage collection tank. When the COD in the sewage collection tank / COD of the circulating blowdown water ≥1.5, the water in the sewage collection tank is prohibited from being transported into the circulating water through the blowdown water lifting pump, the primary bag filter and the secondary bag filter.

[0042] The implementation scheme of the present application will be described in detail below in combination with examples, but those skilled in the art will understand that the following examples are only used to illustrate the present application and should not be regarded as limiting the scope of the present application.

[0043] Example 1: A company has an existing industrial circulating cooling water system, with a circulating water volume of 2000m 3 / h, using a high-concentration-ratio zero-blowdown reagent formula, but the turbidity and hardness of the circulating water system cannot be stably controlled, and there is a risk of scaling.

[0044] After using the industrial circulating cooling water system blowdown water turbidity and hardness removal and reuse device provided by the present application, the control blowdown water volume is 1m 3 / h, the blowdown water turbidity is 63 NTU, the filtered water turbidity is 56 NTU, the turbidity degradation rate is 11.11%; the blowdown water calcium hardness is 552 mg / L, the filtered water calcium hardness is 159 mg / L, and the calcium hardness degradation rate is 71.19%.

[0045] The specific treatment process includes the following steps:

[0046] The industrial circulating cooling water system blowdown water is collected into the blowdown water collection tank, and the blowdown water enters the primary bag filter through the blowdown water lifting pump, the primary bag filter inlet Y-shaped filter screen, the primary bag filter outlet water enters the secondary bag filter, and the secondary bag filter outlet water is analyzed and qualified, then measured through the secondary bag filter outlet valve and flow meter, and then used as make-up water in the industrial circulating cooling water system. The unqualified water is returned to the blowdown water collection tank by opening the secondary outlet backflow valve.

[0047] The operation step is as follows: first, the industrial circulating cooling water system sewage is collected into the sewage collection tank, and after confirming that the sewage lifting pump starting liquid level requirement is met, the secondary bag filter outlet valve is checked and confirmed to be closed, the secondary bag filter outlet backflow valve is slowly opened, the sewage lifting pump is started, and the lifting pump outlet valve is opened at the same time, the primary bag filter and the secondary bag filter are filled with water, when the two-stage filter top exhaust valve has water continuously discharged, the turbidity and calcium hardness of the secondary bag filter outlet are sampled and analyzed, after the filtered water meets the liquid supplementing requirement, the secondary bag filter outlet backflow valve is closed, the secondary bag filter outlet valve is slowly opened, and after the flow is measured by the flowmeter, the industrial circulating cooling water system is supplemented with water.

[0048] During operation, the primary bag filter inlet pressure and the secondary bag filter outlet pressure need to be inspected and recorded, and the inlet and outlet pressure difference of the two-stage bag filter is controlled to be less than or equal to 0.3 MPa. When the inlet and outlet pressure difference of the two-stage filter is found to be greater than 0.3 MPa, the secondary bag filter outlet backflow valve is opened in time, the secondary bag filter outlet valve is closed, and the sewage lifting pump is stopped at the same time. Then, the filter bag of the primary bag filter is removed and cleaned, the filter bag of the secondary bag filter is removed and cleaned, and after cleaning and reinstallation, the operation is started.

[0049] During operation, the primary bag filter inlet pressure and the sewage lifting pump outlet pressure need to be inspected and recorded, and when the primary bag filter inlet pressure is much lower than the sewage lifting pump outlet pressure, the Y-shaped filter before the primary bag filter needs to be cleaned.

Claims

1. A device for turbidity reduction and hardness removal in industrial circulating water systems, characterized in that: The sewage water collecting tank, the sewage water lifting pump, the first-stage bag filter and the second-stage bag filter are included. The sewage water collecting tank is used for collecting industrial circulating cooling water sewage, the outlet of the sewage water collecting tank is connected with the sewage water lifting pump, the outlet pipe of the sewage water lifting pump is sequentially connected with the lifting pump outlet valve, the first-stage bag filter inlet Y-type filter screen and the first-stage bag filter, a first-stage bag filter front sampling guide is arranged on the pipeline connecting the first-stage bag filter inlet Y-type filter screen and the first-stage bag filter, and a first-stage bag filter inlet local pressure gauge is arranged; the side lower outlet pipe of the first-stage bag filter is directly connected with the side upper inlet pipe of the second-stage bag filter through a pipeline, a second-stage bag filter outlet local pressure gauge and a second-stage bag filter rear sampling guide are arranged on the second-stage bag filter side lower outlet main pipe, two branch pipes are branched, one branch pipe is connected with the second-stage bag filter outlet valve and the second-stage bag filter outlet flow meter, and the other branch pipe is connected with the second-stage bag filter outlet backflow valve.

2. The industrial circulating water system blowdown water turbidity and hardness removal and reuse device according to claim 1, characterized in that: The filter bag precision of the first-stage bag filter and the second-stage bag filter is 10 microns.

3. The industrial circulating water system blowdown water de-turbidity and hardness removal and reuse device according to claim 1, characterized in that: The lifting pump outlet valve is arranged on the outlet pipe of the sewage water lifting pump, the valve opening degrees of the lifting pump outlet valve, the second-stage bag filter outlet valve and the second-stage bag filter outlet backflow valve are adjusted to jointly adjust the second-stage bag filter outlet flow.

4. The industrial circulating water system blowdown water turbidity and hardness removal and reuse device according to claim 3, characterized in that: The height of the sewage water lifting pump water inlet is greater than or equal to 1 meter from the bottom of the sewage water collecting tank.

5. The apparatus for reducing turbidity and hardness of blowdown water of industrial circulating water system for reuse according to claim 1, characterized in that: The pressure of the first-stage bag filter is controlled to be 0.5-0.6 MPa, and the pressure of the second-stage bag filter is controlled to be 0.3-0.4 MPa.

6. The industrial circulating water system blowdown water de-turbidity and hardness removal and reuse device according to claim 5, characterized in that: The inlet and outlet pressure difference of the two-stage bag filter is less than or equal to 0.3 MPa.

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