KR100399466B1 - Sewage and wastewater treatment system using biofilter - Google Patents

Abstract

The present invention relates to a physical and biological treatment system of wastewater. It is designed to remove insoluble solids, dissolved organic matter, and nitrogen contained in waste water through physical filtration and biodegradation.

Description

Wastewater treatment system using biofilter {Sewage and wastewater treatment system using biofilter}

The present invention relates to a wastewater treatment apparatus for the purpose of physical filtration and removal of organic matter and nitrogen by microorganisms. The present invention simplifies and operates the apparatus by allowing organic filtration and microorganisms to be simultaneously removed in a single reactor. It is to facilitate management.

Existing sewage and wastewater treatment methods are complicated and difficult to operate, requiring specialized knowledge for maintenance and having relatively high maintenance costs such as power and labor costs. In addition, the treated water quality has not reached a satisfactory level.

As a conventional wastewater treatment method, a catalytic oxidation method, a combined purification tank, a high efficiency combined purification tank, etc. have been mainly used. In the case of the catalytic oxidation method, there is a disadvantage in that the operating cost is high because the power consumption is relatively high and the waste water sludge generated with high moisture content is generated. In addition, high concentrations of organic matter in the treated water often do not meet the treated water quality standards.If the inflow of wastewater is irregular or it is not aerated for 1 to 2 weeks, pin floc phenomenon or microorganisms are killed. As a result of this phenomenon, the water quality of the treated water is not only deteriorated, but also the inconvenience of having to replant the microorganisms. In the case of merger purification tanks and high-efficiency merger purification tanks, the contact oxidation method with improved sediment separation and flow rate adjustment functions is integrated into a glass fiber reinforced plastic (FRP) tank to reduce the size, but they also require specialized knowledge for maintenance. In addition, there is a disadvantage in that operating costs are high due to power costs, noise problems, and waste sludge disposal problems.

It is an object of the present invention to provide a system that maximizes treatment efficiency while minimizing installation and operating costs in wastewater treatment.

In the physical and biological treatment systems of wastewater, organic filtration and microorganisms allow simultaneous removal of organics and nitrogen in a single reactor.

Insoluble solids in the wastewater introduced from the upper part of the reactor are first filtered and removed by the filter, and dissolved organic matter in the wastewater passed through the filter is removed while passing through the aerobic microorganism carrier in the center of the reactor. In addition, the wastewater passing through the microbial carrier is finally treated through the lower filter. Sometimes the treated water can be recycled to the top of the reactor to achieve high nitrogen removal efficiency. The filter and the carrier are all filled with materials having the same kind and properties, and because they are porous and have high adsorption performance and specific surface area, they are excellent for filtration and adsorption removal of solids while meeting the conditions for attachment and growth of high concentration of microorganisms. Has performance. In order to maintain aerobic conditions, the microbial carrier in the center is provided with a ventilation opening and an exhaust opening so that outside air is introduced to a space above the carrier. This air inlet device can be operated without aeration blower because natural inflow by pressure difference is possible, not forced air inflow through blower. As a result, the device is simple and easy operation management can provide an unmanned automatic operation system.

The present invention can be easily applied to sewage and wastewater treatment of large buildings, lodgings, restaurants, military units, etc., because the device is simple and does not require professional personnel for operation and management, and biochemical oxygen demand (BOD) and suspended solids ( TSS) can be applied to wastewater with a concentration of 1,000 mg / L or less. In addition, the effluent of the present invention can be reused as heavy water after the conventional sterilization process to BOD 10mg / L or less.

1 is a perspective view of the present invention

2 is a cross-sectional view of the present invention.

3 is a plan view of the wastewater treatment apparatus.

4 is a schematic diagram of a biofilter unit module according to the present invention.

5 is a schematic diagram of the wastewater flow inside the biofilter according to the present invention.

<Description of Symbols for Main Parts of Drawings>

1. Influent pipe 2. Reactor

3. Air inlet pipe 4. Air outlet pipe

5a. Horizontal biofilter 5b. Vertical biofilter

6. Carrier for Aeration of Wastewater 7. Lower Collector

8. Treated water outlet pipe 9. Treated water recycle pipe

10. Sewage / Waste Water Transport Path 11. Primary Level

12. Second Layer 13. Third Layer

When described in detail based on the accompanying drawings to achieve the object of the present invention as follows.

1, 2, and 3 show a perspective view, a longitudinal sectional view, and a plan view of the wastewater treatment apparatus of the present invention, respectively. FIG. 4 is a schematic diagram of a biofilter unit module, and FIG. A schematic of the flow is shown.

The wastewater introduced into the reaction tank 2 through the inlet pipe 1 is primarily passed through the horizontal biofilter 5a to remove suspended matter. Horizontal and vertical biofilters (5a) and (5b) mounted inside the reactor (2) are a type of stone fiber made of melted stone and coke. Circuits do not occur and are uniformly diffused into the horizontal biofilter 5a and the vertical biofilter 5b as shown in FIG. The middle surface portion of the upper vertical biofilter 5b, which first encounters the incoming wastewater, may be blocked after a long time of operation, but in this case, as shown in FIG. ), The influent wastewater flows smoothly and undergoes the same filtration process. In addition, as shown in FIG. 5, the suspended solids flowing into the system accumulate on the surfaces of the horizontal biofilter 5a and the vertical biofilter 5b at the top, but the dissolved substances are accumulated through the horizontal biofilter 5b. It is possible to move to 5a) and is uniformly diffused in the horizontal biofilter 5a.

Most of the dissolved organic matter in the filthy water and wastewater passed through the horizontal biofilter 5a is decomposed and removed by the microorganisms. The horizontal biofilter 5a and the vertical biofilter 5b form a primary layer. The wastewater passing through the primary layer 11 falls and hits the wastewater dispersing aeration carrier 6. The wastewater dispersing aeration carrier 6 is arranged in a horizontal direction with a large number of general PVC pipes. In FIG. 2 of this specification, these are shown as a cross section. The wastewater that has passed through the vertical biofilter 5b and the horizontal biofilter 5a of the primary layer 11 falls and collides with the surface of the pipe-type wastewater dispersing aeration carrier 6 and is separated into small particles. The material of the wastewater dispersing aeration carrier (6) does not change physically or chemically, and may be a stable product for falling wastewater, and the wastewater dispersion by wastewater. It is possible to have a shape capable of maintaining an irregular shape without being blocked between the aeration carriers 6 and in the present invention, PVC pipe is used as the embodiment. Without any separate blower device is configured to be made smoothly by the pressure difference according to the inlet and outlet of the treated water.

The horizontal biofilter 5a and the vertical biofilter 5b used in the present invention serve as excellent mediators to which microorganisms can attach and grow because of high porosity and excellent adsorption performance. In addition, because of its excellent water retention capacity, even if the inflow of wastewater is intermittently interrupted, such as the phenomenon of holding water in the sponge, the wastewater does not escape and the contact time with the microorganism can be long enough to prevent the death of microorganisms. It will play a role. Therefore, most of the dissolved organic matter in the wastewater filtered through the primary layer 11 is removed through the vertical biofilter 5b and the horizontal biofilter 5a of the secondary layer 12. The waste water treatment apparatus of the present invention may be referred to as a construction method combining the advantages of the soil purification principle and the spraying filter method.

Next, the contaminants passed through the secondary layer 12 collide with the wastewater dispersing aeration carrier 6 formed at the bottom of the horizontal biofilter 5a as before entering the secondary layer 12 to be separated into small particles and combined with oxygen. The waste water, which has passed through the wastewater dispersing aeration carrier 6, flows into the secondary layer 12 at the bottom and then is discharged, thereby providing sufficient oxygen and providing a horizontal biofilter (5a). And aerobic decomposition conditions for growing microorganisms attached to the vertical biofilter (5b). After passing through the secondary layer, the wastewater is dispersed into the aeration carrier and then introduced into the tertiary layer (13). The remaining organic matter is oxidized once again in the vertical biofilter 5b and the horizontal biofilter 5a formed in the tertiary layer 13, and the nitrogen nitrate is denitrated.

The treated water thus treated is stored in the lower collecting device 7 and finally discharged through the treated water outlet pipe 8. Finally, to improve the quality of the discharged water was configured to undergo the same purification process through the treated water recycle pipe (9) connected to the upper portion of the reaction tank (2).

The horizontal biofilter 5a and the vertical biofilter 5b can selectively adjust the number of stages according to the required treated water level, and the number of the air inlet pipe 3 and the air discharge pipe 4 can be adjusted. In addition, the horizontal and vertical biofilters (5a) (5b) is configured so that partial replacement at any time, because it is not an integral type of assembly.

Table 1 below shows the results obtained by applying this apparatus to the generally generated sewage.

Influent concentration (mg / L) Effluent Concentration (mg / L) Processing efficiency (%) Biochemical Oxygen Demand (BOD) 140-400 (262) 0 to 10 (1.6) 97-100 (99.4) Suspended solids (TSS) 192-1096 (544) 0 to 23 (8.1) 94-100 (97.7) Total Nitrogen (T-N) 20.9 to 64.7 (38.9) 3.6-20.5 (10.0) 35 to 94 (70.0)

* () Is mean value.

As described above, the effect obtained through the wastewater treatment apparatus using the biofilter of the present invention is simple to manage the operation without specialized knowledge, and sometimes unmanned operation is possible,

By reducing the use of energy-consuming mechanical devices, maintenance costs such as power costs can be minimized, there is no noise problem, and waste sludge can be minimized to reduce the cost of sludge treatment.

In addition, due to the low installation and operation costs and easy maintenance, it is easy to apply to the wastewater treatment of buildings, lodgings, large restaurants, military units, etc., where no professional driving personnel can be hired. Because of the treatment, the effluent water of the present invention can be reused as heavy water after the existing sterilization process.

The land area occupied by the present invention is smaller than the existing construction method, and since it can be buried underground, land can be used efficiently.

Claims (2)

The primary layer 11 having the porous vertical biofilter 5b and the horizontal biofilter 5a having a rock surface inside the reaction tank 2 having the inflow water pipe 1 formed thereon is mounted in the vertical and horizontal directions, respectively. Make up, At the bottom of the primary layer 11, the wastewater dispersing aeration carriers 6 in the form of horizontally arranged pipes are arranged in a form spaced apart from the primary layer 11 at a predetermined interval, and to the lower end of the wastewater dispersing aeration carriers 6. A secondary layer 12 is formed in which the vertical biofilter 5b and the horizontal biofilter 5a are mounted in the same manner as the primary layer 11, and the air inlet pipe 3 and the air discharge pipe are formed on the side of the secondary layer 12. (4) is made up, Wastewater dispersing aeration carriers 6 are arranged at a lower end of the secondary layer 12 in a form spaced apart from the secondary layer 12 at a lower distance, and a vertical biofilter 5b and a lower end of the wastewater dispersing aeration carriers 6 are arranged. The tertiary layer 13, in which the horizontal biofilter 5a is mounted in the same form as the primary layer 11, is constructed. The lower collecting device 7 is mounted to the lower end of the tertiary layer 13, and the treated water outlet pipe 8 is mounted to the side of the lower collecting device, and the outside of the reaction tank 2 is selectively provided from the treated water outlet pipe 8. Waste water treatment apparatus using a biofilter, characterized in that configured to be discharged to or to supply the treated water recirculation pipe (9) to the upper portion of the reaction tank (2). The method of claim 1, A wastewater treatment apparatus using a biofilter, characterized in that it can be installed by adjusting the number of layers of the biofilter according to the water quality standards of the required treatment water.