KR20020051349A - compact sewage treament system for nutrient removal - Google Patents

Abstract

PURPOSE: Provided is a compact sewage treatment system for nutrient removal which is suitable for installation to the collective place of residence of medium-small size isolated from the large scale sewage treatment area. CONSTITUTION: The compact sewage treatment system comprises: an anoxic reactor(10) to the bottom of which an inlet pipe(14) is connected; a fluidizing biological media(11); a perforated plate(13) installed to prevent washing-out of fluidizing biological media and an agitator(12); an aeration tank(20) in which a blower(22) and an air compressor(23) are installed, and is packed with fixed biological media(21), and sends treated water to the anoxic reactor; a clarifier(30) which settles biological mass sloughed away from the biological media. The fluidizing media in which many denitrification bacteria are cultivated can remove two kind of pollutants at once and the material of that is 30-60PPI of polyether which has a zeolite or not. The packing ratio of the fluidizing biological media is 5-20% of the anoxic reactor and the fixed biological media is 10-30% of the aeration tank.

Description

Compact sewage treament system for nutrient removal

The present invention relates to a compact wastewater treatment device for removing nutrients. More specifically, the present invention relates to a compact wastewater treatment device for removing nutrients. The following is directed to an abbreviated wastewater treatment apparatus for nutrient removal.

In general, wastewater is regulated by law to be discharged by appropriate treatment below the discharge limit of discharged water by removing organic matter, nitrogen, phosphorus, etc. in order to prevent eutrophication of surrounding streams. Therefore, wastewater treatment facilities for treating domestic sewage or factory wastewater are installed in living zones and factories.

However, in existing wastewater treatment facilities, it is impossible to remove nutrients such as nitrogen and phosphorus, and adopts a floating growth method that is difficult to cope with hydraulic load change or organic load change. Since the management is not made, it is mainly being constructed around a large sewage treatment plant or a wastewater treatment plant, and there is a problem that it is not suitable to be installed in a small and medium sized residential area such as a water supply source.

Therefore, in the small- and medium-sized collective settlements located near the water supply, wastewater is not treated properly, and organic matter, nitrogen, phosphorus, etc. contained in the wastewater are insufficiently treated, which leads to serious eutrophication of the wastewater discharge area. The countermeasure against the situation is urgent.

An object of the present invention is to solve such a conventional problem, and it is possible to remove nutrients and to install it in a compact form, which is suitable for installation in a small and medium sized residential area separated from a large sewage treatment area. To provide a compact wastewater treatment apparatus for salt removal.

1 is a block diagram of a condensed wastewater treatment apparatus for removing nutrients according to an embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

10: oxygen-free reactor 11: fluid bed carrier

12: stirrer 13: porous plate

14: inflow pipe 20: aeration tank

21: stationary phase ceramic carrier 22: diffuser

23: blower 24: internal transfer pump

25: internal return pipe 30: sedimentation tank

31: sludge return pump 32: aeration tank sludge return piping

33: oxygen-free tank sludge return piping 34: treated water discharge piping

35: excess sludge waste piping

As a means for achieving the above object, the configuration of the present invention, an oxygen-free reaction tank with a built-in inlet pipe for introducing the waste water to the bottom, a porous bed to prevent the loss of the fluidized bed and a stirrer to induce smooth stirring, acid The engine and the pneumatic generator are combined, the fixed bed carrier is filled, and the aeration tank for introducing nitrified treated water into the anoxic reaction tank at the front end, and the precipitation tank for precipitating some desorbed suspended solids from the carrier.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the accompanying drawings in order to describe in detail enough to enable those skilled in the art to easily carry out the present invention. . Other objects, features, and operational advantages, including the object, operation, and effect of the present invention will become more apparent from the description of the preferred embodiment.

For reference, the embodiments disclosed herein are only presented by selecting the most preferred examples to help those skilled in the art from the various possible examples, the technical spirit of the present invention is not necessarily limited or limited only to this embodiment. However, various changes and modifications are possible within the scope without departing from the technical spirit of the present invention, as well as other equivalent embodiments.

As shown in Figure 1, the constitution of the reduced waste water treatment apparatus for removing nutrients according to an embodiment of the present invention, the stirrer 12 is installed, the fluidized bed carrier 11 is filled The porous plate 13 is installed to prevent the loss of the fluidized bed carrier 11, and the inner conveying pipe 25 and the sludge conveying pipe 33 for the inflow of the oxidized treated water together with the inlet pipe 14 at the lower portion (33) ) Is connected to an oxygen-free reaction tank (10), a blower (23) for generating air pressure, and an acid pipe (22), filled with a fixed-phase ceramic carrier (21), and nitrified treated water The aeration tank 20 to which the inner conveying pump 24 and the inner conveying pipe 25 to be returned to the oxygen-free tank 10 are combined, and the sludge is discharged from the microorganism group after the sludge is precipitated. For returning to the anaerobic tank 10, respectively. The sludge conveying pump 31 and the aeration tank sludge conveying pipe 32 and the sludge conveying pipe 33 is composed of a settling tank 30 is combined.

By the above configuration, the action of the abbreviated wastewater treatment apparatus for removing nutrients according to an embodiment of the present invention is as follows.

After the waste water passes through a fine auto bar screen having an eye interval of about 5 mm, the waste water flows into the raw water storage tank, and then flows into the lower portion of the anaerobic reaction tank 10 through the waste water inflow pipe 14.

The anoxic reactor 10 is a combination reactor, and operates in a form in which an adhesion growth method and a floating growth method are introduced.

The wastewater introduced into the lower portion of the anoxic reaction tank 10 is freed of organic matter by denitrifying bacteria and facultive microbe attached to the fluidized bed carrier 11 filled inside the anoxic reaction tank 10, and the denitrification reaction is carried out. Proceeds, nitrogen is separated from waste water in gaseous form.

The anoxic reaction tank 10 is filled with a fluidized bed carrier 11 capable of accumulating microorganisms, so that denitrified microorganisms inhabits a large amount of organic matter and biosorbs and decomposes organic matter contained in the introduced wastewater, and is used as a carbon source for denitrification.

In addition, the fluidized bed carrier 11 introduced into the anoxic reaction tank 10 is secured by the stirrer 12 rotating at about 60 to 180 rpm, thereby ensuring maximum contact with contaminants, and in the influent raw water. Occlusion in the reaction tank 10 by organic matter can be prevented.

The material of the fluidized bed carrier 11 filled in the oxygen-free reaction tank 10 is 30 to 60 PPI with polyether, and the zeolite is impregnated therein and used according to the properties of the influent. The zeolite impregnated inside the fluidized bed carrier 11 is a high siliceous zeolite in which SiO 2 and Al 2 O 3 occupy 80% or more. The filling rate of the fluidized bed carrier 11 inside the oxygen-free reactor 10 is 5-20% of the volume, and the MLSS in the oxygen-free reactor 10 is maintained at 6,000-15,000 mg / L.

Water treated from the oxygen-free reaction tank 10 is introduced into the natural oil flow to the lower portion of the aeration tank 20 through the upper weir. The aeration tank 20 has a membrane diffuser 22 arranged therein to inject air generated from the blower 23, and the fixed phase ceramic carrier 21 is 10 to 30% of the volume inside the aeration tank 20. It is filled.

The aeration tank 20 is operated by a biofiltration as an alluvial reaction tank containing a ceramic carrier, the dissolved oxygen concentration (DO) in the aeration tank 20 maintains more than 1.0mg / L.

In the aeration tank 20, the stationary phase microbial carrier 21 capable of biofiltration is filled to cause nitrification of organic matter and ammonia nitrogen, and the inner tank is returned to the anoxic reactor 10 at the front end.

The composition of the fixed-phase ceramic carrier 21 filled in the aeration tank 20 is 35 to 75 parts by weight of aluminum hydroxide (Al (OH) 3), 30 to 65 parts by weight of bentonite, titanium oxide (TiO 2) 1 10 to 30 parts by weight of the raw material composition consisting of ~ 8 parts by weight of water, 2 to 14 parts by weight of organic additives, 0.1 to 1.8 parts by weight of the organic binder, 0.1 to 1.8 parts by weight of the release agent and 0.05 to 0.65 parts by weight of the plasticizer, g / cc) is 2.63 ~ 3.5, specific surface area (m2 / g) 1.66 ~ 1.68 x 10-2, pore size is 5 ~ 300 um, and it has an open cell structure in which each pore is interconnected. It has a compressive strength (kgf) of 650 ~ 740 and wears less than 0.002% even after prolonged use. The microbial adhesion amount is 0.8 ~ 1.2 (g / cm3), which is produced through extrusion molding and sintering drying process.

As in the present invention, in the case of the total denitrification method in which the anoxic reaction tank 10 is placed at the front end, the blockage by suspended matter and undecomposed organic matter contained in the influent is a serious problem during long-term operation, and various methods for solving the problem are provided. It is being tried. In addition, it is not easy to secure a stable amount of microorganisms against the variation of organic matter, when the load fluctuations may be discharged in an untreated state or outflowed in a polluted state than influent.

A feature of the present invention is to improve the denitrification efficiency by integrating a large amount of denitrification bacteria in the fluidized bed carrier 11, and to simultaneously remove the two contaminants by using organic contaminants in the influent as the energy source for the denitrification reaction, In combination with an oxygen-free reaction tank (10) to prevent occlusion by suspended substances contained in the aeration tank and aeration tank (20), which is an aerobic alluvial reaction tank for nitrifying untreated organic matter and ammonia nitrogen at the front end, impact load and hydraulic load variation Respond reliably.

That is, the present invention operates the anoxic reaction tank 10 at the front end so that the organic materials contained in the waste water can be used for the energy source required for the denitrification without a separate carbon source injection, in order to maintain a high concentration of microorganisms The fluidized bed microorganism carrier 11 was applied and operated as a fluidized bed reactor to prevent the blockage in the reaction tank 10 due to the high concentration of microorganisms, and the aeration tank 20 which is an alluvial reaction tank for stable organic matter removal and nitrification at the rear end. It is designed to be suitable for the environment of the group residential area separated from the Daegumo sewage treatment area by minimizing the load of the sedimentation tank 30 and easy to operate and maintain by operating in conjunction with the nutrients such as nitrogen and phosphorus contained in the waste water. Remove material to prevent eutrophication of effluents.

Therefore, the removal of nutrients in the wastewater according to the present invention is easy to maintain and maintain as an attachment growth method that can stably cope with such an impact as well as the prevention of eutrophication, and the amount of sludge generated in the sedimentation tank 30 is also an existing treatment facility. Rather, it requires less land and can be operated economically, thus making it a compact system.

As described above, in the embodiment of the present invention, the nutrients can be removed and can be installed in a condensed manner, so that the nutrients can be removed in a small and medium sized residential area separated from the large sewage treatment area. It can provide a compact wastewater treatment apparatus for. Such effects of the present invention can be used in various applications within the scope of the technical spirit of the present invention in the environmental field.

Claims (6)

Oxygen-free reactor with built-in inlet pipe for introducing waste water, fluidized bed carrier, porous plate to prevent loss, and agitator to induce smooth agitation, combined with acid pipe and pneumatic generator, filled with fixed bed carrier, and nitrification An aeration type wastewater treatment apparatus for removing nutrients, comprising an aeration tank for introducing the treated water into an anoxic reaction tank for shearing and a settling tank for precipitating some of the suspended solids from the carrier. The method of claim 1, wherein in the fluidized bed carrier, a large amount of denitrification bacteria are integrated to improve denitrification efficiency, and at the same time, the organic pollutants of the influent are used as an energy source for denitrification to remove two contaminants at the same time. Reduced wastewater treatment device for nutrient removal. The method of claim 1, wherein the material of the fluidized bed carrier is polyether 30 to 60 PPI, the abbreviation for removing nutrients, characterized in that the zeolite is impregnated therein and not impregnated according to the properties of the influent. Type wastewater treatment system. The method of claim 1, wherein the filling rate of the fluidized bed carrier in the anoxic reactor is 5 ~ 20% of the volume of the reduced wastewater treatment apparatus for nutrient removal. The method of claim 1, wherein the aeration tank is filled with a fixed-phase microbial carrier capable of biofiltration to cause nitrification of organic matter and ammonia nitrogen, and the internal aeration tank is returned to the anoxic reaction tank at the front end. Wastewater Treatment System. The apparatus of claim 1, wherein the filling rate of the fixed-phase ceramic carrier in the aeration tank is 10 to 30% of the volume.