Double-combined anti-oxidation device for wastewater treatment technology

Abstract

The invention discloses a dual-combined anti-oxidation device for a wastewater treatment technology. The dual-combined anti-oxidation device comprises a dosing box, a dosing pump, a pipeline mixer and an ORP (oxidation reduction potential) detection meter. Reducing agents are doubly added at the inlet of the multi-medium filter and the inlet of the reverse osmosis membrane, and cation bed resin and the reverse osmosis membrane can be jointly prevented from being oxidized. During operation, solid sodium hydrogen sulfite is prepared into a solution according to the proportion of 1: 1, the solution is added to an outlet of a water feeding pump of the multi-medium filter and a reverse osmosis inlet of the multi-medium filter through the two diaphragm metering dosing pumps respectively, and the two dosing pumps are designed to be provided with one for standby and one for local and remote control modes; the redox potential of an inlet and a reverse osmosis inlet of the multi-medium filter can be controlled within 150mV by matching the stroke of an in-situ dosing pump and the frequency of a remote control dosing pump, a pipeline mixer is arranged at a dosing point, so that a sodium hydrogen sulfite solution can be fully mixed with incoming water, the fluctuation of an ORP value is reduced as much as possible, and the service life of the multi-medium filter is prolonged. And the oxidation-reduction potential of water at the inlet and the reverse osmosis inlet of the multi-medium filter can be detected in a targeted manner.

Description

Technical Field

[0001] The present invention relates to the technical fields of wastewater resource utilization and wastewater zero-discharge technology, and in particular to a dual-combined anti-oxidation device for wastewater treatment technology. Background Art

[0002] Recycled water reuse is a device that converts all wastewater generated within the plant into reusable recycled water and salt through a series of processes such as sedimentation and filtration to achieve zero wastewater discharge. It is divided into a conventional section and a concentration section. The concentration section process is high-density tank → ozone contact tank → multi-media filter → weak acid cationic bed → ultrafiltration → reverse osmosis. Since the wastewater will continue to concentrate during the treatment process, the COD will increase exponentially. Ozone contact oxidation combined with the effect of hydrogen peroxide can directly oxidize organic pollutants in the water into non-toxic small molecules, or even completely convert them into harmless inorganic substances to reduce the COD of the wastewater. However, in this process, the addition of oxidants will cause the ORP of the wastewater to rise sharply to 300mV, which is extremely detrimental to the resin and reverse osmosis membrane in the weak acid cationic bed for hardness removal in the subsequent process. Under normal circumstances, in order to prevent the oxidation of the reverse osmosis membrane, only reducing agents are added at its inlet and the redox potential is monitored, while the problem that the weak acid cationic bed resin is also easily oxidized is ignored. According to preliminary experimental analysis, the weak acid cationic bed resin is also easily oxidized and decomposed into a colloid floating on the top of the resin, resulting in the weak acid cationic bed being unable to operate normally. Summary of the Invention

[0003] In response to the problems in the prior art, the present invention provides a dual combined anti-oxidation device for wastewater treatment technology, which not only solves the problem of reverse osmosis membrane oxidation, but also solves the problem that the resin is easily oxidized and decomposed into a colloid floating on the top of the resin, causing the weak acid cation bed to be unable to operate normally.

[0004] To achieve the purpose of the present invention, the present invention adopts the following technical solutions: A wastewater treatment technology dual combined antioxidant device includes a reagent dissolution box, a Y-type filter, a dosing metering pump, a pipeline mixer and a matching redox potential online monitoring meter; the top of the atmospheric absorption tower is connected to an emptying cylinder through a pipeline; the dosing metering pump inlet is connected to the Y-type filter outlet, the Y-type filter outlet is connected to the bottom of the reagent dissolution box, and the outlet is connected to the pipeline mixer installed at the outlet of the multi-media filter water pump and the reverse osmosis inlet; an online redox potential monitoring meter is installed at the outlet of the multi-media filter to the inlet of the weak acid cation bed and the reverse osmosis inlet; two dosing metering pumps are designed with one in operation and one in reserve, with local and remote control modes, and the redox potential of the multi-media filter inlet and the reverse osmosis inlet can be controlled within 150mV by coordinating the stroke of the local dosing pump and the frequency of the remote dosing pump.

[0005] Preferably, the reducing agent is added at both the inlet of the multimedia filter and the inlet of the reverse osmosis membrane, which can jointly prevent the oxidation of the cationic bed resin and the reverse osmosis membrane.

[0006] Preferably, the inlet of the dosing metering pump is connected to the outlet of the Y-type filter, and the outlet is connected to the pipeline mixer installed at the outlet of the multi-media filter water pump and the inlet of the reverse osmosis membrane.

[0007] Preferably, the bottom of the reagent dissolution box is connected to the outlet of the Y-type filter. Preferably, an online redox potential monitoring meter is installed from the outlet of the multi-media filter to the inlet of the weak acid cation bed and the inlet of the reverse osmosis membrane.

[0008] Preferably, the dosing metering pump is designed with one in operation and one in reserve, and has two control modes: local and remote. The redox potential at the inlet of the multi-media filter can be controlled by combining the stroke of the local dosing pump and the frequency of the remote dosing pump.

[0009] Compared with the prior art, the present invention has the following beneficial effects: This device double-adds reducing agent at both the multi-media filter inlet and the reverse osmosis membrane inlet, which can jointly prevent oxidation of the cationic bed resin and reverse osmosis membrane. After passing through the multi-media filter inlet pipeline mixer and the reverse osmosis inlet pipeline mixer, the agent can be evenly mixed with water to more effectively reduce the ORP at the cationic bed inlet and reverse osmosis inlet. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 This is a schematic diagram of the structural connection of a dual combined antioxidant device for wastewater treatment technology according to the present invention; In the figure: 1. Multi-media filter water pump, 2. Pipeline mixer, 3. Multi-media filter, 4. Weak acid cation bed, 5. Ultrafiltration membrane group, 6. Pipeline mixer, 7. Reverse osmosis membrane group, 8. Chemical dissolution box, 9. Plug valve, 10. Y-type filter, 11. Plug valve, 12. Plug valve, 13. Dosing metering pump, 14. Dosing metering pump, 15. Plug valve, 16. Online ORP monitoring meter, 17. Online ORP monitoring meter. DETAILED DESCRIPTION

[0011] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention: like Figure 1As shown, in one embodiment of the present invention, a wastewater treatment technology dual combined antioxidant device includes a reagent dissolution tank 8; plug valves 9, 10, 12, 15; a Y-type filter 10; dosing pumps 13, 14; pipeline mixers 2, 6; and online ORP monitoring meters 12, 17. The bottom outlet of the reagent dissolution tank 8 is connected to the plug valve 9, which is connected to the inlet of the Y-type filter 10. The plug valve 11 is connected to the outlet of the Y-type filter 10. The plug valve 12 serves as a secondary line of the Y-type filter 10 and can be switched to the secondary line when cleaning the Y-type filter 10 to ensure continuous operation of the device. The outlet of the combination valve is connected to the inlets of the dosing pumps 13 and 14. The inlet of the plug valve 15 is connected to the outlet of the dosing pump 13, and the outlet is connected to the pipeline mixer 2 through a pipeline. The outlet of the dosing pump 14 is connected to the inlet of the plug valve 18, and the outlet of the plug valve 18 is connected to the pipeline mixer 6 through a pipeline.

[0012] like Figure 1 As shown, in a specific embodiment of the present invention In a specific embodiment of the present invention, the inlet of the dosing metering pump is connected to the outlet of the Y-type filter, and the outlet is connected to the pipeline mixer installed between the outlet of the multi-media filter water pump and the reverse osmosis inlet.

[0013] In a specific embodiment of the present invention, the bottom of the reagent dissolution box is preferably connected to the outlet of the Y-type filter, and an online redox potential monitoring meter is installed from the outlet of the multi-media filter to the inlet of the weak acid cation bed and the reverse osmosis inlet.

[0014] In a specific embodiment of the present invention, the dosing metering pump is designed with one in operation and one in reserve, and has two control modes: local and remote. The redox potential of the multi-media filter inlet and the reverse osmosis inlet can be controlled by combining the stroke of the local dosing pump and the frequency of the remote dosing pump.

[0015] During specific operation, in the reagent dissolution box, sodium bisulfite solution is prepared in proportion, the plug valve 9 and the plug valve 11 at the bottom of the reagent dissolution box are opened in sequence, the Y-type filter is put into use, the pump outlet valve is opened according to the operating steps of the reciprocating diaphragm pump, and the dosing metering pumps 13 and 14 are started. The reducing agent enters the pipeline mixer and is fully mixed with the incoming water.

[0016] During specific operation, the ORP meter at the inlet of the cation bed and the reverse osmosis inlet are put into use as required, the dosing metering pump is driven to a remote position and put into automatic operation. The dosing pump frequency will be automatically adjusted according to the redox potential value displayed on the online ORP meter. The online ORP meter needs to set high and low alarm values ​​according to the actual operating conditions. The purpose of setting a high alarm is to prevent oxidizing water from entering the weak acid cation bed and reverse osmosis, oxidizing the resin and the reverse osmosis membrane, causing the resin to adhere to the resin surface in a colloidal state, causing the weak acid cation bed to be unable to operate normally; and setting a low alarm is mainly to prevent excessive addition of the reducing agent sodium bisulfite.

[0017] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes based on the technical solutions and improved concepts of the present invention within the technical scope disclosed by the present invention, and they should be covered by the scope of protection of the present invention.

Claims

1. A wastewater treatment technology dual combined antioxidant device, characterized by: The double addition of reducing agent at the inlet of the multi-media filter and the inlet of the reverse osmosis membrane can jointly prevent the oxidation of the cationic bed resin and the reverse osmosis membrane, including the reagent dissolution box, the plug valve, the pipeline filter, the dosing metering pump, the pipeline mixer and the matching redox potential online monitoring meter.

2. The dual combined antioxidant device for wastewater treatment technology according to claim 1, characterized in that: The inlet of the dosing metering pump is equipped with a Y-type filter and connected to the bottom of the chemical dissolution tank.

3. The dual combined antioxidant device for wastewater treatment technology according to claim 1, characterized in that: The outlet of the dosing metering pump is respectively connected to the outlet of the multi-media filter water pump and the pipeline mixer installed on the reverse osmosis inlet.

4. The dual combined antioxidant device for wastewater treatment technology according to claim 1, characterized in that: An online redox potential monitoring meter is installed at the outlet of the multi-media filter to the inlet of the weak acid cation bed and the inlet of the reverse osmosis.

5. The dual combined antioxidant device for wastewater treatment technology according to claim 1, characterized in that: The dosing metering pump is designed with one in operation and one in backup, and has two control modes: local and remote. The stroke of the local dosing pump and the frequency of the remote dosing pump can be used to control the redox potential of the multi-media filter inlet and the reverse osmosis inlet to be within 150mV.

Images