Novel VTBR perchlorate wastewater advanced treatment reactor

Abstract

The utility model belongs to the technical field of wastewater treatment, and discloses a novel VTBR perchlorate wastewater advanced treatment reactor which is a'microbial degradation + resin adsorption + microbial regeneration 'combined device and comprises a VTBR vertical baffling biological reaction system and an adsorption regeneration system, the VTBR vertical baffling biological reaction system comprises a VTBR anaerobic biological reaction column and a VTBR aerobic biological reaction column, and the adsorption regeneration system comprises a resin adsorption column, a regeneration tank and a backwashing tank. The main process of the utility model adopts microorganism series resin adsorption, so that compared with a pure resin adsorption process, the resin consumption can be greatly reduced, and the operation cost is reduced. The treated wastewater can be recycled and discharged, and the resin adsorption section adopts a microorganism regeneration mode, so that secondary pollution is avoided.

Description

Technical Field

[0001] The utility model belongs to the technical field of wastewater treatment and relates to a perchlorate wastewater deep treatment reactor. Background Art

[0002] Perchlorate is an emerging persistent pollutant. It's widely used and in high demand in my country, particularly in the fireworks industry, where potassium perchlorate, sulfur, and aluminum powder are key raw materials. To prevent chemical dust accumulation from reaching critical explosion levels and maintain air humidity, workshop floors and work platforms require regular flushing. Consequently, the fireworks industry's production wastewater primarily consists of flushing water from the charging workshop floor and work platforms. This flushing water contains significant amounts of perchlorate, and upon discharge into the environment, this can lead to excessive levels of perchlorate in watersheds, posing a threat to human health. Due to perchlorate's high stability and solubility, its degradation in natural environments can take decades or even longer, making the treatment of perchlorate wastewater particularly critical.

[0003] A utility model with publication number (CN 117023862 A) discloses an apparatus and process for efficiently removing perchlorate wastewater. The apparatus comprises a wastewater tank, a sedimentation tank, a targeted adsorption regeneration system, and a regeneration liquid tank. The apparatus treats high-concentration perchlorate wastewater containing suspended solids, heavy metals, and other substances, achieving good perchlorate removal results. However, the overall process still has the following shortcomings: 1) the process lacks the ability to remove organic matter and cannot simultaneously treat perchlorate wastewater containing organic matter; 2) direct adsorption treatment of high-concentration wastewater consumes a large amount of adsorbent; and 3) chemical regeneration requires subsequent treatment of the regenerated liquid. Utility Model Content

[0004] In order to solve the problems existing in the prior art, the utility model combines the comprehensive needs of engineering application and stable emission standards, and aims to provide a reactor that can be used for the deep treatment of organic matter and perchlorate wastewater at the same time, which can flexibly realize the recycling of wastewater or discharge it in compliance with standards, can achieve the discharge of perchlorate wastewater in compliance with standards, and can also take into account the removal of organic matter in the wastewater, and avoid the discharge of concentrated brine without secondary pollution. This process combination can also be extended to the treatment of other high-salt wastewater.

[0005] The technical solution of this utility model:

[0006] A new type of VTBR perchlorate wastewater deep treatment reactor, a combination of "microbial degradation + resin adsorption + microbial regeneration" device, including a VTBR vertical baffled biological reaction system and an adsorption regeneration system;

[0007] The VTBR vertical baffled bioreactor system includes a VTBR anaerobic bioreactor column and a VTBR aerobic bioreactor column. Perchlorate wastewater enters the bottom of the VTBR anaerobic bioreactor column through a pipeline. The treated effluent enters the bottom of the VTBR aerobic bioreactor column through a pipeline from the top of the VTBR anaerobic bioreactor column. The treated effluent enters the adsorption regeneration system from the top of the VTBR aerobic bioreactor column through a pipeline.

[0008] The adsorption regeneration system includes a resin adsorption column, a regeneration tank and a backwash tank; the resin adsorption column is two-stage and arranged in parallel; the top effluent of the VTBR anaerobic biological reaction column enters the bottom of the resin adsorption column through a pipeline, and after being treated by the resin adsorption column, the top effluent of the resin adsorption column enters the top of the regeneration tank and the backwash tank respectively through pipelines, and after being treated by the regeneration tank and the backwash tank, the bottom effluent from the regeneration tank and the backwash tank merges with the top effluent of the VTBR anaerobic biological reaction column, and enters the resin adsorption column from the bottom of the resin adsorption column again.

[0009] The adsorption regeneration system includes a resin adsorption column, a regeneration tank and a backwash tank; the resin adsorption column is two-stage and arranged in parallel; the top water outlet of the VTBR aerobic biological reaction column is connected to the bottom water inlet of the resin adsorption column through a pipeline; the regeneration liquid outlet in the regeneration tank is connected to the bottom water inlet of the resin adsorption column through a pipeline, and the water outlet at the top of the resin adsorption column is connected to the inlet of the regeneration tank through a pipeline; the backwash liquid outlet in the backwash tank is connected to the bottom water inlet of the resin adsorption column through a pipeline, and the water outlet at the top of the resin adsorption column is connected to the inlet of the backwash tank through a pipeline; the specific implementation process is as follows: VTBR aerobic biological The effluent from the top of the reaction column enters from the bottom of the resin adsorption column through a pipeline. After being treated by the resin adsorption column, the effluent from the top of the resin adsorption column meets the standards and is discharged or reused. After the resin adsorption is saturated, the regeneration tank is started, and the regeneration liquid in the regeneration tank enters from the bottom of the resin adsorption column through a pipeline. After the regeneration is completed, the regeneration tank is returned to the regeneration tank through a pipeline from the top of the resin adsorption column. After the regeneration is completed, the backwash tank is started, and the backwash liquid in the backwash tank enters from the bottom of the resin adsorption column through a pipeline. After the backwash is completed, the backwash tank is returned to the backwash tank from the top of the resin adsorption column through a pipeline. After regeneration and backwashing, the resin adsorption tank can restore its adsorption capacity and be used again.

[0010] The resin adsorption column is connected in two stages in parallel, allowing for alternating regeneration and continuous system operation. Once the resin is saturated, it is regenerated using microorganisms in the regeneration tank, allowing the bacterial suspension to be recycled and preventing secondary contamination.

[0011] The microorganisms described in the utility model are microorganisms screened and domesticated in a laboratory and have a high efficiency in removing perchlorate.

[0012] The backwash tank of the utility model adopts low-concentration alkali solution, which has a small consumption and can be recycled and only needs to be replenished in small amounts. The function of the backwash tank is to remove microbial residues on the surface of the adsorbent.

[0013] The beneficial effects of this utility model are as follows: The main process of this utility model adopts microbial serial resin adsorption, which can significantly reduce resin consumption and lower operating costs compared with simple resin adsorption processes. The treated wastewater can be reused or discharged, and the resin adsorption stage adopts microbial regeneration, which eliminates secondary pollution.

[0014] (1) The VTBR reaction device can not only treat perchlorate in wastewater, but also take into account the removal of conventional indicators such as COD in wastewater. The VTBR reaction system can be flexibly combined according to the characteristics of water quality and the need for pollutant removal. When only the perchlorate indicator needs to be removed, a single-pole anaerobic reaction column can be used; when it is necessary to take into account the removal of organic matter and perchlorate at the same time, an anaerobic-aerobic reaction column series process is used; at the same time, according to the raw water conditions and the effluent water quality, it can be flexibly combined and switched;

[0015] (2) The perchlorate in the wastewater treated by the VTBR reactor can meet the discharge standards and can also be reused as needed to save fresh water. For special situations such as fluctuations in water quality and quantity, the series resin adsorption can ensure that the perchlorate wastewater meets the discharge standards to the greatest extent possible;

[0016] (3) Microbial reaction is carried out at the front end of the adsorption reaction to remove most of the perchlorate, reducing the perchlorate concentration in the influent of the adsorption unit, thereby minimizing the adsorbent consumption;

[0017] (4) The resin adsorption section adopts microbial regeneration, and the regeneration liquid can be recycled, so that the resin can be reused while avoiding secondary pollution. The resin adsorption column adopts parallel connection, and regeneration and adsorption are carried out alternately to ensure continuous and stable operation of the system;

[0018] (5) The VTBR reaction device, resin adsorption device, regeneration tank and backwash tank used in the present invention are all columnar structures, similar in appearance, and can be made into an integral skid-mounted structure in actual installation, which saves space, is easy to manage, and is harmonious and beautiful. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of a novel VTBR perchlorate wastewater deep treatment reactor of the present invention.

[0020] In the figure: 1VTBR vertical baffled bioreactor system, 1-1VTBR anaerobic bioreactor column, 1-2VTBR aerobic bioreactor column, 2 adsorption regeneration system, 2-1 first resin adsorption column, 2-2 second resin adsorption column, 2-3 regeneration tank, 2-4 backwash tank. DETAILED DESCRIPTION

[0021] The specific implementation of the present invention is further described below in conjunction with the accompanying drawings and technical solutions.

[0022] The floor washing wastewater actually contains perchlorate and organic matter, with raw water indicators of perchlorate 280mg / L and COD 900mg / L, and is treated with the device of this utility model. Figure 1 As shown, a perchlorate wastewater deep treatment reactor includes a VTBR biological reaction system 1 and an adsorption regeneration system 2. The VTBR reaction system is composed of multi-stage VTBR reaction columns with fillers inside. The wastewater first enters the VTBR anaerobic biological reaction column 1-1, the end of which is connected to the VTBR aerobic biological reaction column 1-2, and the end of the VTBR aerobic biological reaction column 1-2 is connected to the adsorption regeneration system 2. The wastewater stays in the VTBR reaction system for more than 24 hours. After stable operation, the perchlorate removal load can be stabilized at 56-68 mg / L / day. When the organic matter in the effluent drops to 50 mg / L, the perchlorate content can be reduced to below 10 mg / L, achieving simultaneous removal of perchlorate and organic matter. The wastewater then enters the adsorption regeneration system for deep perchlorate treatment, which can greatly reduce the consumption of adsorption materials and ensure that the perchlorate treatment meets discharge standards.

[0023] The adsorption regeneration system 2 includes a first resin adsorption column 2-1, a second resin adsorption column 2-2, a regeneration tank 2-3, and a backwash tank 2-4. The first resin adsorption column 2-1 and the second resin adsorption column 2-2 are connected in parallel, and the regeneration tank 2-3 and the backwash tank 2-4 are connected to the first resin adsorption column 2-1 and the second resin adsorption column 2-2 respectively via circulation pumps.

[0024] The effluent from the VTBR aerobic bioreactor columns 1-2 or the adsorption regeneration system 2 can be discharged directly or reused, depending on the situation. After sufficient reaction in the adsorption regeneration system, the perchlorate content in the effluent can be less than 0.7 mg / L, meeting local discharge standards.

[0025] The adsorption regeneration system is composed of two identical first resin adsorption columns 2-1 and second resin adsorption columns 2-2 connected in parallel. Regeneration and adsorption are performed alternately. During regeneration, the bacterial suspension in the regeneration tank 2-3 is first controlled by a circulation pump to circulate and react in the first resin adsorption column 2-1 or the second resin adsorption column 2-2 for regeneration. The residence time is more than 48 hours. After regeneration is completed, the backwash tank 2-4 is switched to alkaline solution for backwashing for standby use.

[0026] The first resin adsorption column 2-1 is regenerated after being saturated with adsorption, and at the same time, the wastewater is switched to the second resin adsorption column 2-2 through a valve for adsorption treatment. Such alternating regeneration can realize uninterrupted continuous operation of the entire adsorption regeneration system, and the regeneration liquid can be recycled and used repeatedly without secondary pollution and waste discharge.

[0027] The VTBR reactor column shown in the figure has a housing made of plexiglass, with a packing mesh at its base and internally filled with suspended or fixed elastic fiber packing. The adsorption regeneration system consists of two independent, parallel-connected resin adsorption columns (first resin adsorption column 2-1) and second resin adsorption column 2-2. The housing is made of plexiglass and is cylindrical. Regeneration tank 2-3 contains microorganisms specifically designed to degrade perchlorate, which are recycled. Backwash tank 2-4 contains one or more low-concentration solutions of sodium hydroxide, ammonia, or sodium bicarbonate, which are recycled, replenished regularly, and not discharged.

[0028] The entire system can be placed in a skid-mounted structure and run automatically through instrument control.

Claims

1. A novel VTBR perchlorate wastewater deep treatment reactor, characterized in that: The new VTBR perchlorate wastewater deep treatment reactor is a combined device of "microbial degradation + resin adsorption + microbial regeneration", including a VTBR vertical baffled biological reaction system and an adsorption regeneration system; The VTBR vertical baffled bioreactor system includes a VTBR anaerobic bioreactor column and a VTBR aerobic bioreactor column. Perchlorate wastewater enters the bottom of the VTBR anaerobic bioreactor column through a pipeline. The treated effluent enters the bottom of the VTBR aerobic bioreactor column through a pipeline from the top of the VTBR anaerobic bioreactor column. The treated effluent enters the adsorption regeneration system from the top of the VTBR aerobic bioreactor column through a pipeline. The adsorption regeneration system includes a resin adsorption column, a regeneration tank and a backwash tank; the resin adsorption column is two-stage and arranged in parallel; the top water outlet of the VTBR aerobic biological reaction column is connected to the bottom water inlet of the resin adsorption column through a pipeline; the regeneration liquid outlet in the regeneration tank is connected to the bottom water inlet of the resin adsorption column through a pipeline, and the water outlet at the top of the resin adsorption column is connected to the inlet of the regeneration tank through a pipeline; the backwash liquid outlet in the backwash tank is connected to the bottom water inlet of the resin adsorption column through a pipeline, and the water outlet at the top of the resin adsorption column is connected to the inlet of the backwash tank through a pipeline.

2. The novel VTBR perchlorate wastewater deep treatment reactor according to claim 1, characterized in that: Both the VTBR anaerobic bioreactor column and the VTBR aerobic bioreactor column are multi-stage and filled with fillers.

3. The novel VTBR perchlorate wastewater deep treatment reactor according to claim 1 is characterized in that: The resin adsorption column is connected in two stages in parallel, and is switched alternately for regeneration to ensure continuous operation of the system.

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