KR20030077240A - Instrument contained high tension hollow-fiber membrane module to separate solid-liquid and the method of operation the same - Google Patents

Abstract

PURPOSE: Provided are a solid-liquid separator having a hollow fiber membrane therein, which performs a role of a sedimentation tank, the separator being advantageous in ensuring treated water quality and reducing installment area of a water treatment system, and further provided is a method for operating the same separator. CONSTITUTION: The separator comprises a membrane support(8), a hollow fiber membrane(9) installed in the support(8), an air distributor(10) installed near the bottom of the support(8) and an intake pipe(12) installed at an upper portion of the support(8). The method comprises continuously inputting raw water in aeration tank to the solid-liquid separator having the hollow fiber membrane(9) therein, while discharging the water from the membrane(9) by a pump, performing suction filtration by the hollow fiber membrane(9) for 5-30 minutes, stopping the filtration for 1-10 minutes, and repeating the suction filtration and stopping, wherein the hollow fiber membrane filtrates raw water with suspended solids concentration less than 1 mg/L at flux rate of 10-50 L/m¬2/hr.

Description

{Instrument contained high tension hollow-fiber membrane module to separate solid-liquid and the method of operation the same}

In the present invention, 12,000-μm-sized pores for filtration (16) of the aeration tank raw water (1) of the activated sludge method with treated water having a concentration of sludge and suspended particles of 1 mg / l or less and 12,000 which are not broken even in severe aeration It is a solid-liquid separation device with a hollow fiber membrane module (9) having a high tensile strength of -18,000 kgf / ㎠.

More specifically, the treated water 16 having the suspended particle concentration of up to 1 mg / l through the hollow fiber membrane module 9 is transferred to the solid-liquid separation container 7 by transferring the aeration tank raw water 1 containing a lot of solid materials such as suspended particles. It is a solid-liquid separator for filtration at a performance of 10-50 L / ㎡ / hr.

In general, the raw water of the aeration tank of activated sludge is transferred to the settling tank and solid-liquid separation is carried out by gravity, and the portion of the supernatant is discharged, and some of the precipitated sludge is discarded and some is returned to the aeration tank. However, if the abnormality of the aeration tank, ie, sludge bulking, is poor, raw water from the abandonment tank moved to the sedimentation tank cannot be separated well, and some sludge is included in the symbolic water, and the quality of the discharged water is not suitable for the wastewater discharge standard.

In addition, the sedimentation of the activated sludge in the aeration tank is not good, so the solid-liquid separation in the sedimentation tank is not good, and the water quality of the supernatant water does not meet the emission standard, and at the same time, it is difficult to control the amount of activated sludge returned. This changes the concentration of activated sludge in the aeration tank to prevent stable wastewater treatment, and the concentration of the activated sludge is low, which greatly reduces the capacity of the aeration tank.

In the case of fine particles or activated sludge in the supernatant water, cumbersome treatment such as sand filter media or activated carbon filter may be added for secondary treatment. In the activated sludge process, the sedimentation tank for solid-liquid separation has a big disadvantage in that a lot of site costs are required because a large capacity sedimentation tank must be installed according to the sedimentation properties of the sludge.

The apparatus of the present invention separates and discharges only the treated water from which the activated sludge and all particles are excluded, and the total amount of the activated sludge is returned to the aeration tank, so that the sludge concentration of the aeration tank is 1.5-2 times higher than that of the conventional aeration tank. It has the advantage of being.

Therefore, the present invention transfers the raw water (1) of the aeration tank in the solid-liquid separation vessel (7) in place of the settling tank to solve the above problems, the hollow fiber membrane module having a pore size of 0.1-0.5㎛ and high tensile strength ( 9) Filter water is discharged with the performance of 10-50L / ㎡ / hr to remove the suspended solids due to the precision filtration characteristics, thereby replacing the function of the sedimentation tank. It eliminates the site of the settling tank to solve the space problem and solve the sludge bulking problem caused by the operation of the aeration tank and to return the active sludge separated by the membrane from the solid-liquid separator to the aeration tank (6) to maintain high concentration of microorganisms in the aeration tank. It can greatly increase the processing efficiency.

1 is a conceptual diagram of a solid-liquid separation device with a hollow fiber membrane module,

Figure 2 is a detailed view of the high tensile strength hollow fiber membrane module in a solid-liquid separator.

-Explanation of symbols in the drawings

(1) abandonment

(2) inflow pump

(3) inflow line

(4) inlet

(5) outlet

(6) Return spill line

(7) Solid-liquid Separation Container

(8) Hollow fiber membrane module support

(9) Hollow fiber membrane module

(10) diffuser

(11) drain

(12) suction line

(13) Suction line shut off valve

(14) suction pressure gauge

(15) suction pump

(16) filtered water

(17) Cleaning fluid injection line on / off valve

(18) cleaning liquid injection pressure gauge

(19) Cleaning solution injection line

(20) Cleaning liquid injection pump

(21) Cleaning solution storage tank

(22) Air injection line

23 blower

(24) control box

25 control sensor lines

The present invention is a solid-liquid separation device (7) with a hollow fiber membrane module (9) having a pore size of 0.1-0.5㎛ size and a high tensile strength of 12,000-18,000 kgf / ㎠ and pumps the aeration tank raw water (1) (2) Inlet (3) to the inlet (4) of the solid-liquid separator (7) through the transfer line (3) by using, and the aeration tank raw water (1) is filled up to the water level of the solid-liquid separator (7) outlet (5) (1) is conveyed to the aeration tank through the conveyance line 6 out of the outlet 5. Sludge of the aeration tank raw water using the hollow fiber membrane module 9 mounted in the solid-liquid separator 7 at the same time the inlet (3) and the outflow (6) occur continuously to the solid-liquid separator (7). And the treated water separated from the suspended solids are produced at the performance of 10-50L / m2 / hr depending on the quality of the raw water of the aeration tank.In order to enhance the solid-liquid separation effect, the suction box (10-35cmHg) has a suction pressure (14). The operation time of the suction pump 15 is set to 5 to 30 minutes so that the stop time is set to 1 to 10 minutes to be repeated. The diffuser 10 mounted below the hollow fiber membrane module support 8 generates air bubbles of 1-3 mm from the air injected by the blower 23, so that the aeration tank raw water 1 in the solid-liquid separator 7 is discharged. Sludge and suspended particles are attached to the outer surface of the hollow fiber membrane module 9 to suppress the decrease in permeation performance (16) and the increase in suction pressure (14). When the suction pressure 14 increases to 35 cmHg or more, the operation of the suction pump 15 is stopped by the sensor line 25 of the control box 24 and the suction line 12 opening / closing valve 13 is locked. At the same time, the opening / closing valve 17 of the cleaning liquid injection line 19 is opened and the cleaning liquid injection pump 20 is operated to open the cleaning liquid in the cleaning liquid storage tank (L) at a pressure 18 of 0.1-0.5 kgf / cm 2 for 10 minutes to 1 hour. The cleaning solution is injected into the hollow fiber membrane module 9 to open the closed pores and detach the gel layer on the surface of the membrane 9. After the injection of the cleaning liquid, the operation of the cleaning liquid injection pump 20 is stopped and the cleaning liquid injection line 19 is closed. At the same time, the suction line 12 opening / closing valve 13 is opened and the suction pump 15 is operated, and the hollow fiber membrane module 9 is filtered 16 at the initial suction pressure 14 and the permeation performance. If the permeation performance is not restored by the above automatic cleaning due to long time use, stop the operation of the solid-liquid separator (7) once or twice in about 30 minutes to 1 hour, and the solid-liquid separator (7) through the drain hole (11). After returning the raw aeration tank 1 to the aeration tank, a solution obtained by mixing NaOCl 0.1-0.5% + NaOH 1-5% with the filtered water 16 into the solid-liquid separator 7 was filled to the effluent water 5 level. After the air is injected by the blower 23 (22, 10), the cleaning liquid is injected into the membrane module 9 at a pressure 18 of 0.1-0.5 kgf / cm 2 by the cleaning liquid injection line pump 20. After washing, the washing liquid is returned to the aeration tank through the drain port 11, and the solid-liquid separator 7 is operated normally as in the initial stage.

According to the above configuration and operation, the present invention introduces the raw water of the aeration tank into the solid-liquid separator 7 having the hollow fiber membrane module 9 having a pore size of 0.1-0.5 μm and the hollow fiber membrane module 9 is suspended. Abandoned tank raw water (1), which is discharged by suction filtration (16) and discharged (6) out of the solid-liquid separator (7) with a treatment performance of 10-50 L / m2 / hr to maintain a substance concentration of 1 mg / l or less. 6 is returned to the aeration tank again to maintain a high concentration of microorganisms in the aeration tank to increase the treatment efficiency 1.5 to 2 times and has a great effect of reducing the settling tank installation site by replacing the settling tank function.

Claims (6)

The inlet and outlet water of the aeration tank is continuously inflowed and outflowed into the solid-liquid separator using the pump, and the hollow fiber membrane module mounted in the solid-liquid separator is stopped for 5 to 30 minutes by suction suction and 1 to 10 minutes. Sand-type separation membrane is a solid-liquid separation device, characterized in that by the suction pump to filter the treated water having a concentration of suspended particles in the aeration tank raw water of 1 mg / l or less with a permeation performance of 10-50L / ㎡ / hr. The solid-liquid separation device of claim 1, wherein the pore size of the hollow fiber separation membrane is 0.1-0.5 µm. The solid-liquid separator of claim 1, wherein the hollow fiber separator has a tensile strength of 12,000-18,000 kgf / cm 2. The solid-liquid separator according to claim 1, wherein the hollow fiber membrane has a processing performance of 10-50 L / m 2 / hr at a suction pressure of 10-35 cmHg. According to claim 1, The diffuser mounted below the hollow fiber membrane supporter is characterized in that the air injected by the blower generates 1-3mm of air bubbles to suppress the adhesion of suspended matter to the outer surface of the hollow fiber membrane Solid-liquid separator The method according to claim 1, when the suction pressure is increased to more than 35 cmHg injection of the cleaning solution into the hollow fiber membrane for 30 minutes to 1 hour at a pressure of 0.1-0.5kgf / ㎠ to wash the separation membrane, the suction pump is finished The solid-liquid separation device, characterized in that the operation is automatically started to operate the filtration process.