KR20150088496A - Method for maintaining activity of sludge in mbr process - Google Patents

Method for maintaining activity of sludge in mbr process Download PDF

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Publication number
KR20150088496A
KR20150088496A KR1020140008867A KR20140008867A KR20150088496A KR 20150088496 A KR20150088496 A KR 20150088496A KR 1020140008867 A KR1020140008867 A KR 1020140008867A KR 20140008867 A KR20140008867 A KR 20140008867A KR 20150088496 A KR20150088496 A KR 20150088496A
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South Korea
Prior art keywords
sludge
tank
membrane
submerged
mbr process
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KR1020140008867A
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Korean (ko)
Inventor
나유미
정철중
이양우
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코웨이 주식회사
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Priority to KR1020140008867A priority Critical patent/KR20150088496A/en
Publication of KR20150088496A publication Critical patent/KR20150088496A/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D65/00—Accessories or auxiliary operations, in general, for separation processes or apparatus using semi-permeable membranes
    • B01D65/02—Membrane cleaning or sterilisation ; Membrane regeneration
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/30—Aerobic and anaerobic processes
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2301/00—General aspects of water treatment
    • C02F2301/04—Flow arrangements
    • C02F2301/043—Treatment of partial or bypass streams
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2303/00—Specific treatment goals
    • C02F2303/14—Maintenance of water treatment installations
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2303/00—Specific treatment goals
    • C02F2303/16—Regeneration of sorbents, filters

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  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Biodiversity & Conservation Biology (AREA)
  • Microbiology (AREA)
  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Separation Using Semi-Permeable Membranes (AREA)

Abstract

A method for maintaining sludge activity in an MBR process is disclosed. The method for maintaining the sludge activity of the MBR process is a submerged separation membrane treatment system in which an MBR process is separately installed outside the bioreactor and the submerged separation membrane bath connected to the aerobic tank by a pipeline or a bulkhead is sequentially installed. In injecting medicines into the hollow fiber membrane to maintain the immersed hollow fiber membranes, some of the sludge in the immersion membrane chamber exposed to the medicament can be discarded to the outside and only the remaining can be internally transported to the bioreactor.

Description

[0001] METHOD FOR MAINTAINING ACTIVITY OF SLUDGE IN MBR PROCESS [0002]

An embodiment of the present invention relates to a method for maintaining the sludge activity of an MBR process, and more particularly, to a method for preventing microbial activity deterioration occurring after the maintenance of a separation membrane in a wastewater treatment system using an MBR process .

In general, the treatment methods for sewage and wastewater can be roughly divided into physical methods, chemical methods and biological methods, and each treatment method is determined by the characteristics of the sewage to be introduced, the use of the treated effluent, .

The physical and wastewater treatment methods are selectively used such as ammonia removal by air removal, filtration, distillation, floatation, foam separation, cooling, separation using gas layer, ground scattering, reverse osmosis and absorption.

In addition, methods for treating chemical wastewater are selectively used such as activated carbon adsorption, flocculation, precipitation, ion exchange, electrochemical treatment, electrodialysis, oxidation and reduction. Biological wastewater treatment methods include bacterial assimilation, algal extraction, and nitrification-denitrification methods.

Nitrogen and phosphorus contained in sewage and wastewater belong to nutrient salts. If they can not be removed properly, they will become a main cause of eutrophication when they are discharged, causing abnormal propagation of algae in polluted waters, polluting water supply and industrial water. It is necessary to effectively remove nitrogen and phosphorus contained in the waste water and wastewater.

Conventional biological nitrogen and phosphorus removal methods include anaerobic / anoxic / aerobic (A2 / O), Bardenpho and UCT processes. Each of the above processes basically has at least one anaerobic tank, anoxic tank, and oxic tank, and is deformed in processes such as internal transportation and sludge transportation.

In recent years, MBR (Membrane Bioreactor) process combining biologic treatment and membrane has attracted attention in order to secure stable reuse. The MBR process can maintain the concentration of mixed microspores (MLSS: Mixed Liquor Suspended Solid) as high as about 5000 to 10,000 mg / L, which is advantageous in increasing biological nitrogen removal performance.

In addition, the MBR-based wastewater treatment system is capable of maintaining a high concentration of sludge in the reaction tank, stabilizing the treated water with suspended substances and pathogenic microorganisms, because the solid-liquid separation is carried out through the immersed hollow fiber membrane installed in the separation membrane bath It is a technology that can be obtained.

Such immersed hollow fiber membranes cause fouling, which is contaminated by organic matter and microorganisms, in the process of solid-liquid separation of treated water from sludge. As fouling progresses, energy consumption is increased because the production rate is reduced or the pump operation rate is increased to ensure a constant production quantity. Therefore, periodic cleaning must be performed to solve the problem of fouling.

Such cleaning methods include air bubble cleaning, periodic backwashing using treated water, and maintenance cleaning using sodium hypochlorite (NaOCl).

The maintenance cleaning is to back-wash in the submerged separation membrane bath for a certain period of time using chemicals periodically in order to solve the membrane fouling problem caused by membrane organic matter generated in air cleaning and periodic backwashing. Generally, maintenance cleaning is performed through backwash of drug once a day. Sodium hypochlorite is mainly used to remove the microorganisms that grow on the surface of the immersed hollow fiber membrane, and the drug is injected in the reverse direction of the filtration while the immersion hollow fiber membrane is immersed in the immersion membrane.

Sodium hypochlorite used for maintenance cleaning removes microbial contamination of the hollow fiber membrane, but also causes a problem of degradation of microorganisms in the sludge. As a result of measuring Specific Oxygen Uptake Rate (SOUR) as an indirect indicator to determine the effect of periodic maintenance on microbial activity, the ratio of arsenic in winter season was 84 ~ 88% Respectively. Nitrifying microorganisms, which are independent nutritional microorganisms, are more sensitive to toxicity than heterotrophic microorganisms, and non-nitrification activity, which is the activity of nitrifying microorganisms in the separation membrane, is reduced to 71% due to maintenance washing.

Accordingly, the internal conveyance has been stopped for 1 hour or more until the microbial activity deteriorated by exposure to the preservative cleaning agent is recovered.

However, until the microbial activity is restored, it takes more time in the winter than in the summer when the temperature is high, and the microorganisms which are exposed to the chemicals and have decreased activity are more likely to cause membrane contamination.

The matters described in the background section are intended to enhance the understanding of the background of the invention and may include matters not previously known to those skilled in the art.

Embodiments of the present invention provide a method for maintaining the sludge activity of an MBR process that can prevent degradation of microbial activity occurring after maintenance and cleaning of a separation membrane in a wastewater treatment system using an MBR process.

The method of maintaining the sludge activity of the MBR process according to an embodiment of the present invention is a method of maintaining a sludge activity in an MBR process using an MBR process in which an immersion separation membrane bath separately installed outside a biological reactor and connected to a man- In the submerged hollow fiber membrane of the submerged membrane separation tank, a part of the sludge in the submerged membrane separation tank exposed to the chemicals is internally returned to the bioreactor while the medicines are injected into the submerged hollow fiber membrane to maintain the immersed hollow fiber membrane .

In the MBR process, the anaerobic tank, the stabilization tank, the anoxic tank, and the aerobic tank may be sequentially installed in the bioreactor.

Further, in the method for maintaining the sludge activity of the MBR process according to the embodiment of the present invention, the internal transfer can transport the activated sludge from the submerged membrane separation tank to the stabilization tank.

Further, in the method of maintaining the sludge activity of the MBR process according to the embodiment of the present invention, when the maintenance and cleaning is started, the internal transfer of the activated sludge can be stopped.

In addition, the method of maintaining the sludge activity of the MBR process according to the embodiment of the present invention can partially dispose of the activated sludge after the maintenance and cleaning, and only carry the remaining sludge therein.

The embodiment of the present invention can maintain the activity of the sludge in the separation membrane tank at a high level by disposing a part of the sludge exposed to the chemical during the maintenance of the submerged separation membrane in the waste water treatment system to which the MBR process is applied, It is possible to minimize deterioration and to prevent contamination of the immersion separation membrane by microorganisms whose activity has deteriorated.

These drawings are for the purpose of describing an embodiment of the present invention, and therefore the technical idea of the present invention should not be construed as being limited to the accompanying drawings.
1 is a block diagram schematically showing a waste water treatment system according to an embodiment of the present invention.
2 is a sectional view of a waste water treatment system according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings, which will be readily apparent to those skilled in the art to which the present invention pertains. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

In order to clearly illustrate the present invention, parts not related to the description are omitted, and the same or similar components are denoted by the same reference numerals throughout the specification.

It is to be noted that the drawings are for reference only for the purpose of clearly and concretely explaining the preferred embodiments of the present invention and technical ideas or features, and therefore may be different from actual product specifications.

It is to be understood that both the foregoing general description and the following detailed description of the present invention are exemplary and explanatory and are intended to provide further explanation of the invention as claimed. .

In the following detailed description, the names of the components are denoted by the first, second, and so on in order to distinguish them from each other in terms of the same names, and are not necessarily limited to those in the following description.

Throughout the specification, when an element is referred to as "comprising ", it means that it can include other elements as well, without excluding other elements unless specifically stated otherwise.

It should be noted that terms such as " ... unit ", "unit of means "," part of item ", "absence of member ", and the like denote a unit of a comprehensive constitution having at least one function or operation it means.

1 is a block diagram schematically showing a waste water treatment system to which an MBR process according to an embodiment of the present invention is applied.

Referring to FIG. 1, the wastewater treatment system 100 according to the embodiment of the present invention can be applied to a water treatment apparatus for purifying drinking water, o / wastewater, industrial wastewater, and the like.

For example, the sewage / wastewater treatment system 100 is basically an activated sludge process in which the number of purification treatment targets (hereinafter referred to as "raw water" The phosphorus in the wastewater is consumed by dissolving the phosphorus and decomposing the organic matter in the sludge under the aerobic condition and consuming the phosphorus by the phenomenon that the phosphorus is excessively consumed and eventually discarding the excess sludge containing phosphorus. Removed.

The lower wastewater treatment system 100 includes an MBR unit 1 in which an anaerobic tank 10, a stabilization tank 20, an anoxic tank 30, an aerobic tank 40 and an immersion separation membrane tank 50 are sequentially installed .

In the anaerobic tank 10, the raw water to be treated flows into the raw water and the organic matter of the raw water is converted into volatile fatty acid, and the phophorus storage microorganism stores the organic matter as PHB (poly-β-hydroxybutyrate) The polyphosphate is converted into orthophosphate and released. As a result, the organic matter in the anaerobic tank 10 is decreased and phosphorus phosphate (PO4-P) is increased. At this time, the anaerobic tank 10 is connected to the anoxic tank 30 through the first transfer line Rl, and the activated sludge is transferred from the anoxic tank 30 to be treated.

The anoxic tank 30 removes nitrogen from wastewater by reducing nitrate nitrogen to nitrogen gas by using oxygen as a final electron acceptor in the NO3 molecule instead of free oxygen when the microorganisms decompose organic matter under anaerobic conditions.

The stabilization tank 20 is disposed between the anaerobic tank 10 and the anoxic tank 30 and is connected to the submerged membrane separation tank 50 through the second transfer line R2, Respectively.

The stabilization tank 20 uniformly mixes the transport sludge and supplies the organic matter from the raw water or the anaerobic tank 10 to efficiently reduce the dissolved oxygen in the transport sludge. In the submerged membrane separation tank 50, dissolved oxygen is high due to air blowing, so that the dissolved oxygen content in the transporting sludge is high. Accordingly, the concentration of dissolved oxygen is reduced through the stabilization tank 20, and the effect of dissolved oxygen in the anoxic tank 30 is blocked, thereby stably maintaining the denitrification efficiency.

In the oxic tank 40, denitrified raw water flows in the anoxic tank 30 to remove some organic substances from the aerobic condition, nitrification occurs, and a phosphorus process is performed in which excess phosphorus is absorbed in the raw water in the microorganism body.

The submerged membrane separation tank (50) is subjected to solid-liquid separation through the submerged hollow fiber membrane (51) with sludge-containing solid matter and treated water. Finally, phosphorus-containing excess sludge is discharged from the submerged membrane separation tank 50 to remove phosphorus. Also, the sludge is conveyed to the stabilization tank 20 for maintaining the concentration of microorganisms in each reaction tank.

The respective reaction vessels of the anaerobic tank 10, the stabilization tank 20, the anoxic tank 30, the aerobic tank 40, and the submerged membrane separation tank 50 may communicate with each other through a pipeline or the like.

If the solid-liquid separation process is continuously performed in the immersion hollow fiber membrane 51 of the submerged membrane separation tank 50, the contaminants adhere to the surface of the hollow fiber membrane, and the membrane contamination proceeds. As the membrane contamination progresses, the permeation flow rate decreases and the differential pressure increases. Therefore, in order to maintain a stable production amount in the filtration process of the immersion hollow fiber membrane (51), long-term operation is carried out through periodic maintenance chemical cleaning.

The maintenance washing is carried out in such a manner that the chemical is reversely injected into the immersion hollow fiber membrane 51 opposite to the filtration direction. Generally, the maintenance washing is repeated 10 times for 2 minutes water washing, 4 minutes washing, 30 seconds chemical washing and 4 minute washing.

At this time, when the maintenance cleaning is started, the sludge conveyance through the second conveyance line (R2) is stopped at the submerged membrane separation tank (50), so that the sludge exposed to the chemical remains in the submerged membrane separation tank (50).

When the maintenance is completed, 70% of the sludge exposed to the chemical remains in the submerged membrane separation tank 50 and is discharged to the outside through the discharge line L1 to the surplus sludge, and only about 30% L2 to the stabilizing tank.

Typically, the sludge retention time (SRT) of the MBR is about 20 days, and as shown in Table 1 below, the total tank volume per 100 ton / day is 35 m3, The excess sludge generation amount is 1.75 m3/ Day, therefore, 2.5 m370% of the sludge It is possible to maintain the activity of the sludge in the submerged membrane separation tank 50 high by disposing the sludge exposed to the medicament with excess sludge.

100 ton / day Anaerobic Stabilization tank Anoxic tank An auger Separator tank Total HRT 1hr 0.5hr 2.6 hr 3.6hr 0.6hr 8.3hr Volume 4.2㎥ 2.1㎥ 10.8㎥ 15.4㎥ 2.5㎥ 35㎥ MLSS 4,123 10,000 8,041 8,041 10,000

By disposing the activated sludge exposed to the medicines as described above, the degradation of the microbial activity can be minimized and the contamination of the immersion separation membrane 51 by the microorganisms whose activity is reduced can be prevented.

2 is a sectional view of a waste water treatment system according to an embodiment of the present invention.

Referring to FIG. 2, the submerged membrane separation tank assembly 50 according to the embodiment of the present invention is divided into a plurality of subassemblies 50A, 50B, 50C, and 50D. Therefore, the sludge in the submerged membrane separation tank (50) is returned to the stabilization tank (20) while producing water is produced in the remaining tank when the maintenance cleaning is proceeded in one tank.

Therefore, even if maintenance and cleaning are completed in one tank and 70% of the sludge is discarded to the outside as excess sludge, the remaining sludge is transported to the stabilization tank 20 continuously, so that the influence on the biological treatment is very small.

Therefore, in the embodiment of the present invention, the sludge activity in the membrane separation tank 50 can be maintained high by disposing a part of the sludge exposed to the chemical during the maintenance of the immersion separation membrane in the waste water treatment system using the MBR process .

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, Other embodiments may easily be suggested by adding, changing, deleting, adding, or the like of elements, but this also falls within the scope of the present invention.

One… MBR unit 10 ... Anaerobic
20 ... Stabilization tank 30 ... Anoxic tank
40 ... Fishing vessel 50 ... The submerged membrane separation tank
R1 ... The first conveying line R2 ... The second conveying line
L1 ... Discharge line

Claims (5)

In a wastewater treatment system employing an MBR process in which a submerged membrane assembly is separately installed outside the bioreactor and connected to the aerobic reactor as a channel or bulkhead,
In the submerged hollow fiber membrane of the submerged membrane separation tank, a part of the sludge in the submerged membrane separation tank exposed to the medicament is discarded to the outside and the remaining one is returned to the bioreactor A method for maintaining sludge activity in an MBR process. The method according to claim 1, wherein the bioreactor includes an anaerobic tank, a stabilization tank, an anoxic tank, and an oxic tank sequentially installed. The method according to claim 1, wherein the internal transfer transports the sludge from the submerged separation membrane bath to the stabilization tank. The method of claim 1, wherein the internal transfer of the sludge is stopped when the maintenance cleaning is started. The method according to claim 1, wherein when the maintenance cleaning is completed, a part of the sludge is discarded to the outside and only the remaining sludge is internally transported.
KR1020140008867A 2014-01-24 2014-01-24 Method for maintaining activity of sludge in mbr process KR20150088496A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108862825A (en) * 2018-06-14 2018-11-23 安徽中然环保科技有限公司 A kind of Hospital Sewage Treatment recycling technique
CN108892331A (en) * 2018-08-16 2018-11-27 天津碧水源膜材料有限公司 The MBR effluent treatment plant of intelligent integral

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108862825A (en) * 2018-06-14 2018-11-23 安徽中然环保科技有限公司 A kind of Hospital Sewage Treatment recycling technique
CN108892331A (en) * 2018-08-16 2018-11-27 天津碧水源膜材料有限公司 The MBR effluent treatment plant of intelligent integral

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