KR20020011791A - Membrane coupled sequencing batch apparatus for separation - Google Patents

Abstract

PURPOSE: Provided is a membrane coupled sequencing batch apparatus for separation. The apparatus is characterized in that hollow fiber membrane is submerged in an SBR(sequencing batch reactor) for improving separation efficiency of solid/liquid and for preventing wash-out of bacteria. CONSTITUTION: The apparatus is composed of the following parts: an SBR(2) for treating wastewater biologically; a submerged hollow fiber membrane(1) installed inside the SBR(2) for filtering contaminants; a diffuser(3) for supplying air to the hollow fiber membrane(1); a circulation pump(7) and a mixer(8) for mixing inside of the SBR(2); and a pump(6) for discharging supernatant water filtered by the hollow fiber membrane(1).

Description

Membrane-Coupled Continuous Batch Separation Equipment {MEMBRANE COUPLED SEQUENCING BATCH APPARATUS FOR SEPARATION}

The present invention relates to a continuous batch separator, in particular, characterized in that the membrane module is immersed in a continuous batch reactor that continuously performs a multi-step process in order to be able to separate the fluid in a single tank.

Most of the existing sewage treatment processes have used activated sludge method. However, the activated sludge method is intended to remove organic matter, and separate facilities are required to remove nitrogen and phosphorus. The method introduced for this purpose includes a method of using a biofilm such as RBC, water spray, fluidized bed, anaerobic filter, and a circulating method consisting of each aerobic and anaerobic reaction tanks.

To remove nitrogen, chemical or biological methods can be used. As a chemical method, the ion exchange method using a zeolite etc. and the method using adsorption are mentioned. In a biological method for removing nitrogen, organic nitrogen and ammonia nitrogen (NH ₄ -N) are converted into oxidizing nitrogen such as nitrite nitrogen (NO ₂ -N) or nitrate nitrogen (NO ₃ -N). The nitrification process and the denitrification process of converting nitrified oxidative nitrogen into the form of nitrogen gas (N ₂ ) are essential.

As a method for removing phosphorus, there are chemically precipitated and removed phosphorus and biologically induced intake of phosphorus to remove it.

In the sewage treatment process, it is difficult to introduce a chemical method as a main process, and thus it is mostly used as a secondary process because it is difficult in terms of construction methods and economics. As a result, biological processes such as the Bardenpho process, A2 / O, VIP, and UCT have been introduced as main processes.

However, these conventional processes have to make a plurality of reaction tanks, and additional facilities for the return of the sludge or the circulation of the waste water, etc., the operation complexity is hampered by the complexity of the facility, there was a problem of excessive facility cost and operation cost .

As an alternative to solve the above problem, a continuous batch process attracts attention. In short, the continuous batch process is a process of filling and removing in a single reactor. The continuous batch process and the conventional activated sludge process have the same unit process, but the conventional activated sludge process differs in that each unit process occurs simultaneously in a plurality of separate tanks, whereas the continuous batch process occurs continuously in a single tank. . The continuous batch process currently in use consists of five stages: Fill, React, Settle, Draw and Idle.

The continuous batch process stops stirring or aeration for solid-liquid separation and discharges the supernatant to effluent using a gravity settling process. This precipitation process has to keep the contents of the reaction tank is almost stopped, thereby causing a problem that almost stops the desired reaction during the entire process. Moreover, the fluctuation range of the effluent water quality was large according to the sedimentability of the solid component, and there was a disadvantage in that it was not possible to maintain a constant water quality.

In order to separate a fluid such as waste water, a separation membrane can be used, which has many advantages. Depending on the pore size of the membrane can be stably obtained the treated water of a certain quality can increase the reliability of the process. In addition, since an operation such as applying heat or accompanying a phase change is not necessary, it is widely used in a separation step that may be affected by the operation, for example, in a process using microorganisms. In particular, in recent years, the application range of the treatment of sewage and wastewater, treatment of industrial wastewater, treatment of drinking water, separation process in pharmaceuticals and industry has been gradually increasing.

As a hollow fiber separator, the one widely used in recent years is potting the ends of a thread-shaped separator having an outer diameter of about 0.1 to about 2.0 mm at high density by using an adhesive such as epoxy, which is highly integrated. .

There are many forms of hollow fiber membrane modules. The tubular case is mounted outside the membrane module to apply pressure from the outside of the hollow fiber membrane to allow fluid to penetrate into the hollow fiber, and to apply pressure to the inside of the hollow fiber to penetrate the fluid to the outside. Hollow fiber membrane module of the type.

Immersion type separation process using the membrane module is to immerse the hollow fiber membrane module directly in the water tank of the fluid to be treated, and to apply the vacuum to the hollow fiber membrane to allow the fluid to penetrate into the hollow fiber separation. The advantage of this process is that it can lower the manufacturing cost of the membrane module, and there is no need for equipment for the circulation of the fluid required for the existing separation process, it can bring down the facility cost or operating cost.

The present invention is to solve the problems of the prior art as described above, the object of the present invention is to reduce the number of treatment tanks and to shorten the process, thereby reducing the processing time and cost, and at the same time The purpose of the present invention is to improve the efficiency of solid-liquid separation by increasing the settling efficiency, to stably obtain a treated water of constant water quality regardless of sedimentation of solid components, and to prevent wash-out of microorganisms due to excessive load.

1 is a block diagram of a membrane-bound continuous batch separation apparatus according to the present invention.

* Explanation of symbols on the main parts of the drawings *

1: hollow fiber membrane module 2: reactor

3: diffuser 7: submersible circulation pump

8: stirrer

In order to achieve the above object, the membrane-bound continuous batch separation device according to the present invention, a continuous batch reactor for continuously performing a multi-step process to enable fluid separation in a single tank; A membrane module immersed in the continuous batch reactor to filter contaminants; And an air diffuser mounted on the bottom of the continuous batch reactor to supply air to the separator module.

The membrane-bound continuous batch separator according to the present invention is characterized in that it further comprises a stirrer or an underwater circulation pump, or both, to stir the inside of the reactor.

In the separator according to the present invention, the membrane module is characterized in that it has one of the hollow fiber type, tubular or flat type. In the separator according to the present invention, the separator module is characterized in that it is immersed horizontally or vertically.

Hereinafter, with reference to the accompanying drawings, a water treatment apparatus using a hollow fiber microfiltration membrane according to an embodiment of the present invention will be described in detail.

1 is a block diagram of a membrane-bound continuous batch separation apparatus according to the present invention.

As shown in Fig. 1, the membrane-bound continuous batch separation device according to the present invention includes a continuous batch reactor 2 for continuously performing a multi-step process to enable fluid separation in a single tank; A membrane module (1) immersed in the reactor to filter contaminants; And an diffuser device 3 mounted below the reactor to supply air to the separator module.

The hollow fiber membrane module 1 is immersed in the reactor 2, the aeration inside the reactor is performed through an air diffuser 3 installed below the reactor, and an aquatic circulation pump 7 or agitated for stirring inside the reactor. The stirrer 8 is operated individually or simultaneously, and the filtrate is removed to the outside of the reaction tank 2 through the filtrate suction tube 5 connected to the suction pump 6.

Example

Hereinafter, the present inventors describe the experiments performed to verify the effect of the membrane-bound continuous batch separation apparatus according to the present invention. However, the following examples are merely examples for helping the understanding of the present invention, and the present invention is not limited to the following examples.

Example 1

A 10 L membrane-bound continuous batch reactor was fabricated, and the COD 250mg / L wastewater was supplied, and then operated in three stages of inflow (15 minutes), anoxic reaction (2 hours) and aerobic reaction (4 hours). It was. The hydraulic retention time was 10 hours, the total suspended solids concentration was maintained at 5500 mg / L, and the treated water was constantly removed at 20 L / m ₂ / hr through the hollow fiber membrane module during the aerobic reaction. The treated water quality of the membrane filtrate thus obtained was analyzed and the average values for 20 days are shown in Table 1 below.

Comparative Example

A 10 L capacity membrane-bound continuous batch reactor was fabricated and fed with COD 250 mg / L wastewater, followed by inflow (15 minutes), anoxic reaction (2 hours), aerobic reaction (4 hours), and precipitation (1 hour). And a 5-step process of discharge (15 minutes). The hydraulic residence time was 12 hours more than in the above example, and the total suspended solids concentration was maintained at 5500 mg / L. The treated water quality of the effluent thus obtained was shown in Table 1 below with an average value over 20 days.

Item COD removal rate Turbidity (NTU) N removal rate P removal rate Example 1 99.8% 8.3 70.3% 58.7% Comparative example 95.1% 1.2 63.6% 55.6%

It can be seen that the water quality of the treated water obtained in Example 1 is superior to the water quality obtained in Comparative Example 2 using a conventional continuous batch reactor. In all of the COD, turbidity, N removal rate, and P removal rate, the separator according to the present invention showed superior water quality compared to the conventional continuous batch separator. In particular, although not shown in the above table, in view of the stability of the treated water quality, compared with the conventional continuous batch reactor, the membrane-bound continuous batch reactor according to the present invention showed much better results.

In addition, in Example 1, although the overall process was shortened by 1 hour and the hydraulic residence time was shortened by 2 hours compared to the comparative example, Example 1 showed more stable and excellent water quality.

As described above, the present invention can reduce the number of treatment tanks and shorten the process by using a continuous batch process, thereby reducing the time and cost, as well as by immersing the hollow fiber membrane module in such a continuous batch reactor. It improves the efficiency of solid-liquid separation by increasing the sedimentation efficiency of solid materials, and can stably obtain the treated water of constant water quality regardless of sedimentation of solid components, and can prevent wash-out of microorganisms due to excessive load. A continuous batch separator is provided.

Claims (6)

A continuous batch reactor that continuously performs a multi-step process to enable fluid separation within a single bath; A membrane module immersed in the continuous batch reactor to filter contaminants; And Membrane-coupled continuous batch separation device comprising a diffuser device mounted to the bottom of the continuous batch reactor to supply air to the membrane module. The membrane-bound continuous batch separation apparatus according to claim 1, further comprising a stirrer for stirring the inside of the reactor. The membrane-bound continuous batch separation apparatus according to claim 1 or 2, further comprising an underwater circulation pump for stirring the inside of the reactor. The membrane-bound continuous batch separation apparatus according to claim 1, wherein the membrane module has one of a hollow fiber type, a tubular shape, and a flat plate type. 5. The membrane-bound continuous batch separation apparatus according to claim 4, wherein the membrane module is horizontally immersed. 5. The membrane-bound continuous batch separation apparatus according to claim 4, wherein the membrane module is vertically immersed.