KR100593497B1 - Advanced Wastewater Treatment System Using Effluent Electrolysis - Google Patents

Abstract

The present invention relates to a high sewage wastewater treatment system using a semi-water electrolysis, it is intended to be introduced into the bioreactor by electrolyzing the semi-water consisting of the concentrate supernatant, dehydrator desorber, and the like.

To this end, the present invention, the suspended solids removal tank for sedimentation / separation of the solid material in the influent sewage; A bioreactor for removing organic substances and nutrients from the effluent water of the suspended solids removal tank, the electrolyzed return water and the solid-liquid separated return sludge; A solid-liquid separation tank such as a membrane or a sedimentation basin for solid-liquid separation of microorganisms from the mixed suspended solids in the bioreaction tank to obtain final treated water; A sludge treatment tank for discharging the sludge cake and the return water by treating the sludge generated in the floating material removal tank and the sludge generated in the bioreaction tank or the solid-liquid separation tank; By providing a sewage treatment system consisting of an electrolysis tank that electrolyzes the return water generated in the sludge treatment tank and sends it to the biological reaction tank, thereby effectively removing the return water containing high concentrations of organic substances and nutrients. It can increase the efficiency.

Electrolysis tank, reflux water, bioreactor, organic substance removal, nitrogen and phosphorus removal

Description

Advanced wastewater treatment system with electrolysis of sidestream

1 is a process example of the advanced sewage treatment system using the backwater electrolysis according to the present invention

Figure 2 is another process example of the advanced sewage treatment system using the countercurrent electrolysis according to the present invention

<Explanation of symbols for the main parts of the drawings>

10: floating material removal tank 20: biological reaction tank

30: solid-liquid separation tank 40: sludge treatment tank

50: electrolysis tank 60: sludge anoxic tank

70: anaerobic tank 80: anaerobic tank

90: aerobic tank 110: influent sewage

120: effluent 130: mixed suspended solids

140: final water 150,210: internal conveying sludge

160: biological waste sludge 170: sludge from suspended solids removal process

180: countercurrent 190: electrolyzed countercurrent

200: final sludge cake

The present invention relates to an advanced sewage water treatment system for increasing sewage water treatment efficiency by electrolyzing the sewage water generated in the sludge treatment process of a sewage water treatment plant, and more specifically, a sewage water containing a high concentration of organic substances and nutrients. The present invention relates to an advanced sewage treatment system using electrolyzed electrolysis to increase the efficiency of sewage treatment.

Generally, wastewater treatment process is divided into pretreatment, primary treatment, secondary treatment, advanced treatment, and sludge treatment process, and the secondary treatment process is mainly used as biological treatment process. , Rotating disc method, and the like. Initially, it started with the process of removing organic matter.

Recently, due to the problem of red tide in the sea due to eutrophication, a method for removing nitrogen and phosphorus has been developed. Bioreactors commonly used for nitrogen removal are Modified Ludzack-Ettinger (MLE) processes, and bioreactors used for simultaneous treatment of nitrogen and phosphorus are A2 / O (Anaerobic-Anoxic-Oxic) processes and various A2 / O variants. This is being utilized. In addition, various bottle-type methods, such as oxidation or sequencing batch reactor (SBR) method, are being developed.

Foreign A2 / O process variants include University of Cape Town (UCT), Bardenpho, PhoStrip, Virginia Initiative Plant (VIP), Osawa, Modified University of Cape Town (MUCT), Phase Isolation Ditch (PID), DeNiPho There is this. The media processes include Bioforr of Degremont, O.T.V., Biostyr, and the SBR series include Intermittent Cycle Extended Aeration System (ICEAS), Ominiflo SBR, Cyclic Activated Sludge System (CAS), and CAST.

A2 / O-based processes developed in Korea include DNR (Daewoo Nutrient Removal), NAP (Night Added Process), PungLim Industrial P / L-II, ACS (ASRT Control System), PADDO (Pre-anoxic, Anaerobic) , Biological nutrient removal (HS +) including reflux-injected sludge denitrification tanks such as Anoxic-1, Anoxic-2, Oxic), Hanhaha Dynamic Flow (HDF), DeN & P, and Phase Isolation Intra Clarifier Ditches (PhICD).

The median A2 / O family includes CNR (cilium nutrient removal), SM (samsung media) process, NAP (nightsoil added process), SDPR (SK Denitrifying Phosphorus Removal), BioFor, HBR (hanmee bio reactor), HBR II, SPAD (sulfur particle autotrophic denitrification).

Membrane bioreactor (MBR) SYSTEM methods, such as Hyundai Advanced Nutrients Treatment (HANT) and Kolon Immersed Membrane Activated Sludge (KIMAS), are used.

The SBR series includes Kumho & KIST intermittently Decanted Extended Aeration (MSIDE), MSBR, Taeyoung's TSBR and CSBR (Constant Sequencing Batch Reactors), AquaMSBR and Puyang Sequencing Batch Reactors (PSBR).

B3 method using special microorganisms.

Many of the above processes are for biological reactors in sewage treatment.

On the other hand, in the process of treating sludge generated in sewage water treatment process by condensation, digestion, and dehydration, it is essential to generate the return water consisting of the concentrate supernatant, the digester supernatant, and the desorption liquid. It is sent to the inlet to increase organic matter and nutrient load in the wastewater treatment process.

The water quality of the reflux water depends on the process and conditions of the treatment plant. However, in general, the fraction of the amount of pollutant loading in sewage treatment plants is shown in Table 1 below.

 Table 1 Percentage of Sewage Treatment Plant Influent Load (%) Item Thickener Digester Dehydrator Mixed return water Flow rate BOD SS TN TP 0.68 5.16 11.42 5.21 5.94 0.23 4.37 16.44 10.00 11.40 0.30 0.87 3.32 5.42 4.94  1.21 10.40 31.28 20.63 22.28

As shown in Table 1, the flow load is about 1.2% of the influent, but the load of nutrients is about 20%, which implies a large burden on the removal of biological nutrients.

However, efforts to treat the return water generated in the sludge treatment process are still insufficient, and the burden on the removal process of organic materials and nutrients due to the return water is insufficient, so that the sewage water containing the high concentration of organic materials and nutrients is effectively removed. There is a demand for development of a process that can increase processing efficiency.

Therefore, the present invention has been made in order to solve the above problems, the present invention is to remove the organic matter and nutrients by electrolysis treatment of the semi-condensate consisting of the concentrate supernatant, dehydrator desorber, etc., so that the bioreactor can be introduced into the bioreactor, It is an object of the present invention to provide an advanced sewage treatment system using electrolyzed water electrolysis that can reduce the inflow load in the sewage plant and improve the nutrient removal efficiency of the sewage treatment plant.

In order to achieve the above object, the present invention, the primary suspended solids removal tank for sedimenting and separating the solid material in the influent sewage; A bioreactor for removing organic substances and nutrients from the effluent water of the suspended solids removal tank, the electrolyzed return water and the solid-liquid separated return sludge; A solid-liquid separation tank such as a membrane or a sedimentation basin for solid-liquid separation of microorganisms from the mixed suspended solids in the bioreaction tank to obtain final treated water; A sludge treatment tank for discharging the final sludge cake and the return water by treating the primary sludge and the secondary sludge generated in the bioreaction tank or the solid-liquid separation tank; The present invention provides an advanced sewage water treatment system using an electrolyzer consisting of an electrolysis tank that electrolyzes the countercurrent generated in the sludge treatment tank to produce an electrolyzed countercurrent for sending to the biological reaction tank.

The biological reaction tank in the advanced sewage treatment system of the present invention includes a sludge anoxic tank for reducing nitrate nitrogen in the sludge from the return sludge of the electrolyzed treated water and the solid-liquid separation tank; An anaerobic tank for removing organic substances and releasing phosphorus from a part of the effluent dividedly injected from the suspended substance removing tank and sludge introduced from the sludge anoxic tank; An anoxic tank for removing organic substances and nitrogen from a portion of the effluent dividedly injected from the suspended solids removal tank and sludge introduced from the anaerobic tank and internal conveying sludge introduced from the aerobic tank; The reaction tank may be configured in the order of an aerobic tank in which untreated organic matter and ammonia in the sludge introduced from the anoxic tank are removed and phosphorus is expelled to discharge the mixture of suspended solids.

In particular, the electrode plate used in the process of removing organic substances and nutrients from the electrolysis tank may be formed by coating iridium on a titanium electrode plate made of any one of a plate, a mesh, and a cylindrical mesh.

The objects, features and advantages of the present invention will be more readily understood by reference to the accompanying drawings and the following detailed description.

Hereinafter, with reference to the accompanying drawings will be described in detail with respect to the advanced wastewater treatment process of the present invention.

1 is a process example of the advanced sewage treatment system using the semi-waste electrolysis according to the present invention, the suspended solids removal tank 10 for removing suspended solids in the influent sewage 110, and the organic material and nutrients by biological treatment The bioreactor 20 for removal, the solid-liquid separation tank 30 for solid-liquid separation of the mixed suspended solids 130 in the bioreactor, the sludge 170 and the secondary sludge of the suspended solids removal process as the primary sludge It consists of a sludge treatment tank 40 for treating biological waste sludge 160 of the treatment process, and an electrolysis tank 50 for the electrolysis of the return water 180.

The suspended solids removal tank 10 is composed of a combination of a screen, a fine screen, a drum screen, a sedimentation basin, and the like to precipitate and separate (screen, filter) solid materials in the influent sewage 110 to remove suspended solids. Has a process.

In the bioreactor 20, the effluent water from the suspended material removal tank 10 and the return sludge 190, which is separated from the solidified water and the electrolyzed returning water 190, are returned to the sludge 150 is returned, the organic material and It has a treatment process to remove nutrients. In particular, the process that can be used in the biological reaction tank 20, MLE process, A2 / O process, A2 / O series process using media, various modifications of A2 / O process, media process, oxidation or SBR process, process using membrane , B3 method using a special microorganism may be used, and various processes listed below are applicable to the biological reactor of the present invention.

A2 / O series processes include biological nutrient removal (HS +) processes including reflux-injected sludge denitrification tanks such as DNR, NAP, P / L-II, ACS, PADDO, DASPro, HDF, and DeN & P. Process of A2 / O series using CNR, SM process, NAP, SDPR, BioFor, HBR, HBR II, SPAD method, etc., and variation of A2 / O process is UCT, Bardenpho, PhoStrip II, VIP, Osawa, MUCT, PID, DeNiPho, etc., Media process is Biofor, Biostr, etc., SBR series processes are ICEAS, Ominiflo SBR, CASS, CAST, KIDEA, MSBR, TSBR, CSBR, AquaMSBR, WECSBR, PSBR, etc. HANT, KIMAS, MBR system method can be used.

The solid-liquid separation tank 30 is composed of a membrane or a sedimentation basin, and separates the microorganism and the supernatant water from the mixed suspended solids 130 from the bioreactor 20 to discharge the final treated water 140 and the biological waste sludge. It has a processing process of obtaining (160).

The sludge treatment tank 40 processes the final sludge cake 200 by treating the sludge removing process sludge 170 generated in the floating material removing tank 10 and the biological waste sludge 160 generated in the biological treatment process. And a treatment process for discharging the return water 180.

The electrolysis tank 50 has a treatment process of electrolyzing the return water 180 generated in the sludge treatment tank to send the electrolysis treated return water 190 to the biological reaction tank 20. The organic material and nutrient removal process by this electrolysis treatment is decomposed by the direct oxidation method occurring in the electrode plate of the electrolysis tank and the indirect oxidation method by radicals generated in the electrode plate. Here, the electrolysis tank may use an open reactor having a free surface, and may be operated as a closed reactor without a free surface for introducing sludge into the tubular reactor under a constant pressure. In addition, the electrode plate used in the electrolytic bath may be a titanium electrode plate composed of any one of a plate, a mesh, a cylindrical mesh type, in order to prevent corrosion of the titanium substrate is preferably formed by coating the titanium electrode plate with iridium. In particular, the pole plate may be used in different forms depending on the type of sewage water to be treated. In the case of the plate type, the power consumption is high, but considering the treatment efficiency, it is preferable to be applied to the malignant wastewater treatment process, It would be desirable to be applied to low power processes.

2 is another process example of the advanced sewage treatment system using the semi-waste electrolysis according to the present invention, in particular, the biological reaction tank 20 of FIG. 1 is registered by the present applicant (the same inventor) 10-0401721 The sludge anoxic tank 60, anaerobic tank 70, anoxic tank 80, and an aerobic tank 90 described in the heading (name: "biological nutrient removal apparatus including a sludge dewatering sludge denitrification tank") is exemplified. .

Here, the bioreactor 20 of FIG. 1 is a sludge anoxic tank 60 to which the electrolyzed return water 190 and the return sludge 150 of the solid-liquid separation tank are introduced to reduce nitrate nitrogen in the sludge, and the suspension A part of the effluent 120 dividedly injected from the material removal tank and the sludge introduced from the sludge anoxic tank 60 meet together to remove the organic material and release phosphorus, and split injection from the floating material removal tank. Part of the outflow water 120 and the sludge introduced from the anaerobic tank 70 and the internal transport sludge 210 introduced from the aerobic tank meet together to remove the organic material and nitrogen 80 and the anoxic tank 80 It includes an aeration tank (90) for removing the untreated organic matter and ammonia in the introduced sludge and discharge the suspended solid mixture 130 in excess of phosphorus.

In particular, the bioreactor of the patent registration No. 10-0401721 is injected into the sludge denitrification tank without adding the external carbon source such as reflux water consisting of the concentrate supernatant, the dehydrator desorber, and the like into the influent to increase the denitrification rate and improve the nitrogen and phosphorus removal efficiency. As a result, the DNR (Daewoo Nutrient Removal) process, which adds sludge endothelial denitrification to the conventional A ₂ O (Anaerobic-Anoxic-Oxic) process, uses endogenous denitrification in a sludge denitrification tank, and has a low denitrification rate. The NAP (Nightsoil Added Process) process is designed to solve the problems such as the burden of the increase of the subsequent treatment tank by additional nitrogen and phosphorus injection.

Referring to each treatment process for the advanced sewage treatment system of the present invention configured as described above are as follows.

First, the suspended solids removal tank 10 removes the suspended solids in the influent sewage 110 through a suspended solids removal process consisting of a combination of a screen, a fine screen, a drum screen, a sedimentation basin, and the like. Export to).

Next, in the bioreactor 20, the effluent water 120 from the suspended solids removal process and the return water 190 electrolytically treated and the return sludge 150 returned after the solid-liquid separation are introduced into the biological reactor as illustrated above. The organic material and nutrients are removed through the treatment process to discharge the mixed solution 130.

In particular, when the biological reaction tank 20 is configured as shown in FIG. 2, first, the electrolyzed reflux water 190 and the return sludge 150 of the solid-liquid separation process are introduced into the sludge anoxic tank 60 so that nitrate nitrogen in the sludge is introduced. Next, in the anaerobic tank 70, a portion of the effluent 120 split and injected from the suspended matter removing process and sludge from the sludge anoxic tank 60 are introduced to remove organic substances and phosphorus is released. In addition, the oxygen-free tank 80 is a part of the effluent 120 and the sludge coming from the anaerobic tank 70 and the internal conveying sludge 210 introduced from the aerobic tank (90) is introduced together in this place Organic matter and nitrogen are removed. Thereafter, the aerobic tank 90 removes the untreated organic material and ammonia in the sludge introduced from the anoxic tank 80 and discharges the suspended solid mixture 130 in which phosphorus is excessively ingested.

In this biological treatment process, the external carbon source such as the semi-condensate consisting of the supernatant of the condensate and the dehydrator is added to the sludge denitrification tank to increase the denitrification rate. In addition, since the sludge and the countercurrent water is electrolyzed by electrolysis and supplied to an external carbon source, the efficiency can be further improved.

On the other hand, in the solid-liquid separation tank 30 by separating the solid-liquid mixed solution 130 from the biological reaction tank 20 through a separation membrane or a sedimentation basin to separate the microorganism and the symbolic water, the biological waste sludge 160 and the final Treated water 140 is discharged.

Next, in the sludge treatment tank 40, the biological material sludge 160, which is the primary sludge generated in the suspended solids removal process, the secondary material sludge process sludge 170 and the secondary sludge generated in the bioreaction process or the solid-liquid separation process. ) To discharge the return water 180 together with the final sludge cake 200.

Finally, in the electrolysis tank 50, the organic matter and nutrients are produced by the direct oxidation method generated in the electrode plate or indirect oxidation by radicals generated in the electrode plate by electrolyzing the return water 180 generated in the sludge treatment process. By decomposing the electrolyzed countercurrent 190 can be sent to the biological reactor (20).

According to the present invention, it is possible to increase the treatment efficiency of the wastewater treatment plant by treating organic materials and nutrients in the semi-water generated in the sludge treatment process of the wastewater treatment plant by electrolysis process, and also reduce the inflow load rate of the bioreactor. In particular, in the case of a sewage treatment plant having a relatively high nutrient and a low organic substance, the use of the electrolysed sewage treatment as an external carbon source can be utilized as an external carbon source to improve the utilization of the sewage treatment in the sewage treatment plant. It is possible to obtain advantages such as height.

Claims (4)

A suspended solids removal tank 10 composed of a combination of a screen, a fine screen, a drum screen, a sedimentation basin, etc. for removing suspended solids in the inflow sewage 110; A bioreactor 20 in which the effluent water 120 of the suspended solids removal tank, the electrolyzed return water 190, and the solid-liquid separated return sludge 150 are introduced to remove organic substances and nutrients; A solid-liquid separation tank 30 such as an immersion membrane or a sedimentation basin for solid-liquid separation of microorganisms from the mixed suspended solids 130 in the bioreactor to obtain the final treated water 140; The final sludge cake 200 and the return water 180 are treated by treating the sludge 170 and the biological waste sludge 160 generated in the solid-liquid separation tank 30 of the suspended matter removing process 10 generated in the suspended matter removing tank 10. Sludge treatment tank 40 for discharging); Electrolyzed water from the sludge treatment tank 180 is electrolyzed by the electrolyzed bath to send the electrolyzed countercurrent 190 to the bioreactor 20, characterized by consisting of the electrolyzed water tank 50 Advanced sewage treatment system using decomposition. The method of claim 1, wherein the biological reactor 20, A sludge anaerobic tank 60 into which the electrolyzed reflux water 190 and the return sludge 150 of the solid-liquid separation tank are introduced to reduce nitrate nitrogen in the sludge; An anaerobic tank 70 in which a part of the effluent 120 dividedly injected from the floating material removing tank and the sludge introduced from the sludge anoxic tank 60 meet together to remove organic substances and release phosphorus; Part of the effluent 120 dividedly injected from the floating material removal tank and the sludge introduced from the anaerobic tank 70 and the internal conveying sludge 210 introduced from the aerobic tank meet together to remove organic substances and nitrogen (80) Wow; The electrolyzed water electrolysis is characterized in that it consists of an aerobic tank 90 to remove the untreated organic material and ammonia in the sludge introduced from the anoxic tank 80, and discharge the suspended solids mixture solution 130 in excess of phosphorus. Advanced sewage treatment system used. The method according to claim 1 or 2, The electrode plate used in the electrolysis tank is a high sewage wastewater treatment system using a reverse water electrolysis, characterized in that consisting of any one of plate, mesh, cylindrical. [4] The advanced sewage treatment system according to claim 3, wherein the electrode plate used in the electrolysis tank is formed by coating iridium on titanium.

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