KR101887332B1 - Advanced Sewage treatment system with continuous single bioreactor and reverse osmosis membrane and reverse osmosis concentrated water treatment system - Google Patents

Abstract

Disclosed is an excess sludge treatment system which secures the stable treated water quality regardless of water temperature by applying a membrane and a reverse osmosis device for processing treated water in which the solid and liquid are separated in a continuous single bioreactor for allowing the reuse of water. In the excess sludge treatment system, the chemical oxygen demand (NBDCOD) and refractory nitrogen which cannot be biodegraded are removed from concentrated water generated during reverse osmosis by using excess sludge, so that the maintenance costs such as drug costs and power costs can be reduced, and the size of a structure is simplified while making a treatment facility more stable.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sewage treatment system comprising a continuous single bioreactor and a reverse osmosis membrane,

The present invention relates to a sewage elevation treatment system, and more particularly to a sewage elevation treatment system comprising a continuous single bioreactor and a reverse osmosis membrane and including a concentrated water treatment system.

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 biological treatment process, which is the main process of the conventional wastewater treatment system, has a limitation on the removal of nitrogen according to the water temperature, and when the water temperature is low, the stable treatment water can not be obtained.

When reverse osmosis membrane (RO-Membrane) is applied, stable treated water quality can be obtained irrespective of water temperature, which enables recycling of treated water such as landscape water and hydrophilic water. However, there is a problem that high concentration of concentrated water is generated.

Concentrated water generated from the reverse osmosis (R / O) facility can not be discharged out of the system because it has a high pollutant load, and when it is circulated to the sewage treatment facility, serious problems are encountered in the treatment system such as bioconcentration, .

In addition, in the case of a large-capacity sewage treatment facility, the amount of excess sludge generated and the amount of concentrated water generated are increased, and there is a problem that the size of the sludge storage facility becomes large in order to deal with this.

Korean Patent No. 1009574 discloses a system for reusing effluent water using a membrane, but does not describe the treatment of surplus sludge.

The present invention relates to a method and apparatus for recovering water in a single continuous bioreactor by applying membrane and reverse osmosis device to the treated water, (NBDCOD) and non-degradable nitrogen to reduce the maintenance costs such as the cost of medicine and power, and to provide the stability of the treatment facility and to simplify the size of the structure. do.

In order to solve the above problems, the present invention provides a sewage elevation treatment system to which a single continuous bioreactor and a reverse osmosis module are applied, comprising: a sludge storage tank for storing excess sludge from the single bioreactor and concentrated water discharged from the reverse osmosis module; A carbon source supply facility for supplying an organic carbon source to the sludge storage tank; An activated carbon admixture tank in which concentrated water uniformly mixed with excess sludge and carbon source flows in the sludge storage tank; An activated carbon supply facility for supplying powder activated carbon to the activated carbon admixture tank; An agglomeration tank for supplying the coagulant to the concentrated water obtained through the activated carbon admixture tank; A sedimentation tank for subjecting the concentrated water obtained through the coagulation admixture tank to solid-liquid separation and supplying the supernatant water to the flow rate regulator; And a sludge dewater for supplying the water of the settling tank to the flow rate adjusting tank and discharging the remaining sludge to the dewatering cake. The present invention also provides a sewage elevation treatment system including the reverse osmosis concentrated water treatment system using excess sludge.

Also, the continuous single bioreactor may include an excess sludge pump for introducing sewage into the sludge storage tank at a lower part of the inflow pump where inflow sewage is introduced into the sludge storage tank, A secondary settler having a conveying sludge pump for conveying the sludge to the continuous single bioreactor at a lower portion of the bioreactor; A membrane filtration tank for separating the treated water passing through the secondary clarifier and the solid matter; And a membrane treatment water tank including a membrane treatment water supply pump for storing treatment water separated from the membrane filtration tank and supplying the treated water to the reverse osmosis module.

The reverse osmosis module may further include a reverse osmosis supply pump configured to supply the treated water stored in the membrane treatment tank to the reverse osmosis module, A reverse osmosis filter for separating concentrated water containing dissolved organic matter, ionic material and particulate matter from the treated water supplied from the reverse osmosis feed pump; A reverse osmosis pressure pump located at a front end of the reverse osmosis filter and passing concentrated water through the reverse osmosis filter at a high pressure; And a treatment water supply tank located at a front end of the reverse osmosis feed pump, a carbon filter positioned at a rear end of the bag filter, a microfilter disposed at a rear end of the carbon filter, and a sodium hypochlorite (NaOCl) And a pretreatment unit including a reducing agent injecting unit, a hardening substance removing unit at a front end of the micro filter, and a sodium hydroxide (NaOH) injecting unit at a front end of the reverse osmosis pressurizing pump. Processing system.

The present invention relates to a method and apparatus for recovering water in a single continuous bioreactor by applying membrane and reverse osmosis device to the treated water, (NBDCOD) and non-degradable nitrogen, it is possible to reduce the maintenance cost such as the cost of medicine and power, to provide the stability of the treatment facility, and to provide the sewage elevation treatment system that simplifies the structure size .

Also, it is possible to provide a sewage elevation treatment system including a concentrated water treatment system capable of controlling the amount of medicine according to the inflow water quality and the treatment water quality by continuous treatment of the concentrated water, thereby enabling stable treatment.

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is an overall process diagram of a sewage elevation treatment system in accordance with one embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. In the drawings, the same reference numerals are used to denote the same parts throughout the specification, and the details of the present invention will be described with reference to the drawings. Also, throughout the specification, when an element is referred to as "comprising ", it means that it can include other elements, not excluding other elements, unless specifically stated otherwise.

The present invention relates to a sewage elevation treatment system to which a continuous single bioreactor (210) and a reverse osmosis module (300) are applied, wherein the excess sludge of the single bioreactor (210) and the concentrated water discharged from the reverse osmosis A sludge storage tank 110 for storing the sludge; A carbon source supply facility 111 for supplying an organic carbon source to the sludge storage tank 110; An activated carbon admixture tank 120 in which concentrated water homogeneously mixed with excess sludge and carbon source flows in the sludge storage tank 110; An activated carbon supply facility 121 for supplying powdered activated carbon to the activated carbon admixture tank 120; An agglomeration tank 130 for supplying an agglomerating agent to the concentrated water through the activated carbon admixture tank 120; A sedimentation tank (140) for subjecting the concentrated water obtained through the coagulation and mixing tank (130) to solid - liquid separation and supplying the supernatant water to the flow rate regulator; And a sludge dewatering unit (150) for supplying the representative water of the settling tank (140) to a flow rate adjusting tank and discharging the remaining sludge to a dewatering cake, wherein the sewage elevation including the reverse osmosis concentrated water treatment system Processing system.

The continuous single bioreactor (210) is a system in which a secondary settler is connected to a reaction tank, and the activated sludge is returned to the bioreactor. The single settling tank has a function of a secondary settler, (Sequencing Batch Reactor) system which repeats the drainage of water, the process of discharging the settling sludge, and the like.

Therefore, in the single continuous bioreactor 210, the sewage is introduced into the sludge storage tank 110 at a lower part thereof, and the excess sludge is transferred to the lower part of the sludge storage tank 110, A second sludge tank 231 having a conveying sludge pump 231 for conveying sludge to the continuous single bioreactor 210 at a lower portion of the continuous bioreactor 210, (230); A membrane filtration tank 240 for separating the treated water and the solids through the secondary settling tank 230; And a membrane treatment water tank 250 having a membrane treatment water supply pump 251 for storing treatment water separated from the membrane filtration tank 240 and supplying the treated water to the reverse osmosis module 300.

The secondary sedimentation tank 230 may include a transport sludge pump 231 for transporting activated sludge for maintaining microbial concentration of the single bioreactor 210. Finally, phosphorus-containing excess sludge is discharged from the secondary settler 230 to remove phosphorus.

The membrane filtration tank 240 is subjected to solid-liquid separation with a solid material and treated water through a dipping-type flat membrane 241. Accordingly, the membrane filtration tank 240 may include a membrane treatment water suction pump 242 for conveying the treated water having passed through the immersion type flat membrane 241 to the membrane treatment water tank 250.

The membrane treatment tank 250 is a structure for storing the treated water passed through the single bioreactor 210 and the membrane filtration tank 240 and minimizes changes in the quality and quantity of the treated water to the subsequent reverse osmosis module 300 It is possible to smoothly carry out the secondary treatment by the above. Therefore, a membrane treatment water supply pump 251 for supplying the stored treatment water to the reverse osmosis module 300 may be provided.

The reverse osmosis module 300 passes the treated water passing through the single bioreactor 210 and the membrane filtration tank 240 through a reverse osmosis filter using a high pressure pump to produce TN, TP, chromogenic materials and other ionic substances The separated water is separated into concentrated water containing dissolved organic matter, ionic material and particulate matter.

Therefore, the reverse osmosis module 300 is disposed at the downstream of the membrane treatment tank 250 and includes a reverse osmosis supply pump 310 for supplying treated water stored in the membrane treatment tank 250 to the reverse osmosis module 300 ); A reverse osmosis filter 320 for separating concentrated water containing dissolved organic matter, ionic substances and particulate matter from the treated water supplied from the reverse osmosis feed pump 310; A reverse osmosis pressurization pump 330 positioned at a front end of the reverse osmosis filter 320 and passing the concentrated water to the reverse osmosis filter 320 at a high pressure; A bag filter 341 disposed at a front end of the reverse osmosis feed pump 310 and a treated water supply tank 342; a carbon filter 343 positioned at a rear end of the bag filter 341; (NaOCl) and a reducing agent are injected from the front end of the micro filter 344 and the front end of the carbon filter 343 to remove the hard material from the front end of the micro filter 344 and the reverse osmosis pressure pump And a pretreatment unit 340 including a drug injection system 345 for injecting sodium hydroxide (NaOH) at a front end of the pretreatment unit 330.

The reverse osmosis feed pump serves to function as a backwash pump that uniformly feeds the treated water passing through the membrane unit to the carbon filter and removes foreign matter from the carbon filter.

The reverse osmosis filter 320 is provided with a reverse osmosis membrane to separate the reused water and the concentrated water. The reverse osmosis pressurization pump 330 located at the upstream end of the reverse osmosis filter 320 is operated at a high pressure of 10 kg / Treated water having passed through the pretreatment unit 340 is separated and separated into concentrated water containing reused water, dissolved organic matter, ionic substances and particulate matter, from which TN, TP, chromogenic substances and other ionic substances have been removed do. The reused water can be discharged through post treatment such as putting sterilizing chemicals in the discharged water tank, adjusting the pH, or supplied to each use place.

In addition, the reverse osmosis pressurization pump 330 is automatically stopped according to the set values of the pressure switches installed at the front and rear ends to prevent damage due to idling of the pump and damage due to abnormal high-pressure operation in the reverse osmosis membrane, Through the measurement sensor provided at the front and rear ends of the two-way filter 320, all the data such as the pressure rise, the flow rate decrease, and the operation time are accumulated and analyzed, so that the operation can be stably and efficiently controlled.

The pretreatment unit 340 removes contaminants before the process water passes through the reverse osmosis filter 320 to reduce the load of the reverse osmosis filter 320. The pretreatment unit 340 includes a bag filter 341, A water supply tank 342, a carbon filter 343, a microfilter 344, and a chemical injection system 345.

The bag filter 341 is located at the front end of the reverse osmosis feed pump 310 and removes solids contained in the treated water passing through the single bioreactor 210 or the like using a filter cloth, . The treated water supply tank 342 can minimize the variation in the quantity of water supplied to the reverse osmosis module 300 and maintain it constantly, and is connected to the reverse osmosis supply pump 310.

The carbon filter 343 removes organic substances, chromogenic substances, and ion components contained in the treated water to reduce the load on the post-treatment facility, removes components that cause biofouling, To-be-filtered (320).

The microfilter 344 removes particulate matter of 5 microns or more to allow the reverse osmosis filter 320 to operate stably.

The chemical injection system 345 includes a sodium hypochlorite (NaOCl) dosing system for removing microorganisms and bacteria contained in the treated water by chemicals at the front end of the carbon filter 343, a reverse osmosis An SBS dosing system for injecting a reducing agent to prevent damage to the membrane, and an anti-scintillation dosing system (an antiscalant system) for controlling the scale fouling (adherence) of the reverse osmosis membrane by controlling the hard substances contained in the treated water at the front end of the micro- (NaOH) dosing system which suppresses scale fouling (adherence) of the reverse osmosis membrane by adjusting the pH of the treated water at the front end of the reverse osmosis pressurization pump 330.

The dosing amount is automatically controlled by a measurement sensor provided at the rear end of the carbon filter 343 and the micro filter 344, And may be configured to be automatically controlled by a PLC or a PC depending on whether or not the storage tank level sensor and the operation system are operated.

On the other hand, in the single-step anaerobic digestion process, the sludge solid-liquid separated by the nitrogen gas (N ₂ ) generated in the denitrification occurs in the advanced treatment process having excellent biological nitrogen and phosphorus removal, Deteriorates. In order to solve this problem, the present invention employs separation membrane and reverse osmosis treatment device to ensure stable treated water quality irrespective of water temperature, thereby enabling reuse of water. However, there is a problem with the treatment of biodegradable chemical oxygen demand (NBDCOD) and refractory nitrogen contained in concentrated water excluded from reverse osmosis treatment and equipment.

If the concentrated water is circulated back to the sewage treatment facility to deal with this, the performance of the treatment facility may be impaired. Since the characteristics of the reverse osmosis concentrated water can not be coagulated or floated by a low suspended solids concentration (SS) concentration, the present invention can reduce the NBDCOD and the degradation rate of the concentrated water using the excess sludge of the single biological reactor 210, Remove nitrogen.

Therefore, the sludge storage tank 110 stores the excess sludge of the single continuous bioreactor 210 and the concentrated water of the reverse osmosis module 300 together. The excess sludge is transferred to the sludge storage tank 110 by an excess sludge pump 211 installed under the continuous single biological reactor 210.

The carbon source supply facility 111 supplies an organic carbon source to the sludge storage tank 110 to homogenize the carbon source to cause denitrification of the excess sludge to remove the degradable nitrogen. The organic carbon source for the denitrification oxidation can be first put into the sludge storage tank 110 to perform the denitrification and the NBDCOD and the powder activated carbon for removing the refractory nitrogen may be added and reacted in order to maximize the reduction of the drug cost and the treatment efficiency. It is also possible to control the quality of treated water by continuous injection.

The activated carbon supply facility 121 mixes the powdered activated carbon with water and feeds the activated sludge into the activated carbon admixture tank 120 through which the excess sludge has been introduced through the sludge storage tank 110. Thus, a storage tank for storing the powdered activated carbon and a storage tank agitator for mixing the powdered activated carbon with the water may be included. In the activated carbon admixture tank 120, the powdered activated carbon and the concentrated water mixed with the excess sludge are mixed and reacted to remove NBDCOD and refractory nitrogen.

The COD removed by the adsorption action of the granular activated carbon is 40 ~ 236 kg · COD / kg. In the case of the activated carbon powder, the COD removal efficiency is further increased because the specific surface area is much larger than that of the granular activated carbon. The following chemical formula 1 is a biological denitrification reaction formula, and the following chemical formula 2 represents a COD required for biological denitrification.

[Chemical Formula 1]

(2)

The coagulation admixture tank 130 is provided with a flocculant supply facility 131 and a flocculant (polymer) is added to the mixed sludge (excess sludge + concentrated water + activated carbon) reacted in the activated carbon admixture tank 120 to remove sludge flocs Thereby improving sedimentation. The sedimentation tank (140) separates the reacted sludge floc from the coagulation admixture tank (130) by solid-liquid separation and separates the supernatant water and the sludge. The sludge dewatering unit 150 discharges the dewatering cake in which the sludge in the settling tank 140 is concentrated and dehydrated.

In this way, when physically and biochemically treating the concentrated water using the excess sludge generated in the biological treatment process, there is no need for separate medicine for coagulation, thereby reducing maintenance expenses such as drug cost and power cost, The size of the frame and structure can be simplified.

The preferred embodiments of the present invention have been described in detail with reference to the drawings. It will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present invention as defined by the appended claims.

Accordingly, the scope of the present invention is defined by the appended claims rather than the description of the invention, and all changes or modifications derived from the meaning, scope and equivalence of the claims are deemed to be included in the scope of the present invention. .

100: concentrated water treatment system 110: sludge storage tank
111: Carbon source supply facility 120: Activated carbon admixture tank
121: Activated carbon supply facility 130: Coagulation admixture tank
131: coagulant supply facility 140: settling tank
150: Sludge dehydrator
210: Continuous single bioreactor 211: Surplus sludge pump
220: inflow pump station 221: contaminant eliminator
230: Second settling tank 231: Conveying sludge pump
240: membrane filtration tank 241: immersed flat membrane
242: membrane treatment water suction pump 250: membrane treatment tank
251: membrane treated water supply pump
300: Reverse osmosis module 310: Reverse osmosis feed pump
320: Reverse osmosis filter 330: Reverse osmosis pressure pump
340: Pretreatment unit 341: Bag filter
342: Treated water storage tank 343: Carbon filter
344: Microfilter 345: Drug injection system

Claims (3)

A sewage elevation treatment system employing a continuous single bioreactor and a reverse osmosis module,
A sludge storage tank for storing the excess sludge of the single bioreactor and the concentrated water discharged from the reverse osmosis module;
A carbon source supply facility for supplying an organic carbon source to the sludge storage tank;
An activated carbon admixture tank in which concentrated water uniformly mixed with excess sludge and carbon source flows in the sludge storage tank;
An activated carbon supply facility for supplying powder activated carbon to the activated carbon admixture tank;
An agglomeration tank for supplying the coagulant to the concentrated water obtained through the activated carbon admixture tank;
A sedimentation tank for subjecting the concentrated water obtained through the coagulation and mixing tank to solid-liquid separation and supplying the supernatant water to the flow rate regulator; And
And a sludge dewater for supplying the representative water of the settling tank to the flow rate adjusting tank and discharging the remaining sludge to the dewatering cake, wherein the system comprises a reverse osmosis concentrated water treatment system using excess sludge. The method according to claim 1,
The continuous single bioreactor includes a surplus sludge pump for introducing sewage into the sludge storage tank at an inflow pump station where the sewage having passed through the sludge and dirt removers flows in one side,
A secondary settler having a conveying sludge pump for conveying sludge to the continuous single bioreactor at a lower portion of the continuous single bioreactor;
A membrane filtration tank for separating the treated water passing through the secondary clarifier and the solid matter; And
And a membrane treatment water tank having a membrane treatment water supply pump for storing treatment water separated from the membrane filtration tank and supplying the treated water to the reverse osmosis module. 3. The method of claim 2,
A reverse osmosis feed pump configured to feed the treated water stored in the membrane treatment tank to the reverse osmosis module;
A reverse osmosis filter for separating concentrated water containing dissolved organic matter, ionic material and particulate matter from the treated water supplied from the reverse osmosis feed pump;
A reverse osmosis pressure pump located at a front end of the reverse osmosis filter and passing concentrated water through the reverse osmosis filter at a high pressure; And
A bag filter disposed at a front end of the reverse osmosis feed pump, a treated water supply tank,
A carbon filter disposed at a rear end of the bag filter,
A micro filter disposed at the downstream end of the carbon filter,
A pretreatment step of adding a sodium hypochlorite (NaOCl) and a reducing agent at the front end of the carbon filter, removing a hard substance at a front end of the micro filter, and injecting sodium hydroxide (NaOH) at the front end of the reverse osmosis pressure pump part;
Wherein the sewage treatment system comprises:

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