KR20020092877A - Wastewater Treatment Apparatus using Internal Recycle in ICEAS - Google Patents

Abstract

PURPOSE: An intermittent cycle extended aeration system of internal recycle type for sewage/wastewater treatment is provided, which is characterized in that sludge of a secondary reactor is recycled into a primary reactor through a sludge recycle pipe line. Therefore contact time of bacteria of sludge and organics is increased, and removal efficiency of organics, nitrogen, and phosphorus is improved. CONSTITUTION: The system comprises a primary reactor(4), a secondary reactor(2) for treating sewage/wastewater. Air for bacteria growth is supplied by an air supply valve(5). Sludge of the secondary reactor(2) is recycled into the primary reactor(4) through a sludge pump(12), a valve(15), and the sludge recycle pipe line(14). The system uses bacteria of sludge repeatedly by recycle, so treatment efficiency is improved.

Description

Wastewater Treatment System for Internal Transfer Type Intermittent Long-term Aeration Type {Wastewater Treatment Apparatus using Internal Recycle in ICEAS}

The present invention is a sewage and wastewater treatment apparatus according to the so-called ICEAS method, which is a conventional Intermittent Cycle Extended Aeration System (ICEAS) in order to purify sewage and wastewater such as urban sewage and industrial wastewater. Recycling by repetitive transport of sludge to increase the efficiency of removing organic matter, nitrogen and phosphorus from sewage and wastewater, and to effectively purify wastewater and wastewater. When introduced into the main reactor, the second stage through

Sludge internal transport pipeline is installed to return sludge formed by aerobic microorganisms in sewage to aerated air by decomposing, oxidizing and multiplying organic contaminants in sewage. It relates to an internal transport type intermittent long-term aeration type wastewater treatment device.

In general, aeration type wastewater treatment device is aeration mixed wastewater and wastewater with air, and various aerobic microorganisms multiply and aggregate with organic and inorganic suspended solids to form activated sludge with good sedimentation. It is a sewage and wastewater treatment device that is used most widely in the world at present as it decomposes and oxidizes organic pollutants in wastewater and discharges only clean water to be treated through a decanter.

Conventionally, in the aeration type wastewater treatment device, the sewage is sent to the main reaction tank through the pre-reactor, which is the first step of the purification process, and then air is supplied from the air supply valve to mix the aeration to purify the sewage with the activity of microorganisms and settle. The sludge in the activated sludge was pumped into the sludge pump and discarded through the sludge external discharge pipeline.

The present invention is a flow path switching valve capable of returning the sludge to the pre-reactor, which is the first step of the purification process to clean the sewage in the conventional main reaction tank and to collect and dispose of the sludge, which is a settled microorganism aggregate. And it is to provide a sludge internal conveying device that can further improve the performance of sewage and waste water treatment by the additional sludge internal conveying pipeline.

In addition, the inorganic solids of the suspended solids in the biological reaction tank of the general sewage, wastewater treatment plant in Korea is often 60% or more, so the ratio of inorganic solids is quite high, and the flow rate and outflow time of the purified water as in the present invention The intermittent run-off process is performed intermittently, but in the intermittent long-term aeration system of long-term intermittent aeration and wastewater treatment system, the problem of dissolved oxygen maintenance, which is an important factor of biological wastewater treatment, comes from the air supply valve. It is designed to maintain the proper dissolved oxygen concentration by adjusting the air supply time to 0 ~ 24 minutes in one aeration, but to shorten the air supply time by the air supply valve to maintain the proper dissolved oxygen concentration (3 ~ 6mg / l). When the microorganisms settle rapidly, the contact time between sewage and microorganisms is short, which reduces the efficiency of organic matter treatment. Since there was need to form a sufficient condition that the organic matter in the wastewater and the microorganisms in the reaction process can contact could expect a satisfactory treatment effect.

In order to form these conditions, in the conventional intermittent long-term aeration type, additional internal conveying pipelines of sludge are installed in the wastewater treatment apparatus, and many organic substances in the wastewater and wastewater in the pre-reactor are contacted with the microorganisms of the sludge. By promoting the activity of microorganisms to improve the wastewater treatment efficiency.

1 is a partial cross-sectional perspective view of the present invention

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

<Code Description of Main Parts of Drawing>

1: inlet

2: main reactor

3: bulkhead

4: pre-reactor

5: air supply valve

6: distribution outlet

7: Decanter

8: outlet

9: exhaust pipe

10: pull Kimbong

11: overflow jaw

12: sludge pump

13: Sludge outflow pipeline

14: Sludge Internal Transfer Pipeline

15: flow path switching valve

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

As shown in FIGS. 1 and 2, separate wastewater is discharged from the pre-reactor 4, in which the sewage and wastewater, such as urban sewage and industrial wastewater, are introduced into the inlet 1 and blocked by the main reactor 2 and the partition 3. When mixed with the air supplied from the air supply valve (5), the organic soil is decomposed by the activity of the microorganisms are precipitated and introduced into the main reaction tank (2) through the outlet (6) below the partition (3).

When the wastewater and wastewater introduced into the main reaction tank 2 are aeration mixed with the air supplied from the air supply valve 5 at the bottom, various aerobic microorganisms in the wastewater and wastewater decompose and oxidize the organic soil, By nitrification, denitrification, dephosphorization, and solid-liquid separation, the clean supernatant is formed at the top, and the solid is precipitated at the bottom. The clean supernatant at the top is formed through the outlet (8) by a decanter (7), a supernatant outlet. It will flow out to the sea.

Here, the decanter 7 is a known treatment water outlet device or a brief description of the configuration thereof, and the decanter 7 pulls the rod 10 around the discharge pipe 9 interlocked with the outlet 8. Rotation is pulled and pushed to the overflow jaw (11) of the decanter (7) located in the water and horizontal position overflows the treated water flow through the discharge pipe (9) and outlet (8) It flows out to sea.

In addition, the sludge in the activated sludge, which is precipitated by the microorganism agglomerated with organic and inorganic suspended solids, is collected and pumped by the sludge pump 12 while purifying the sewage by the active growth by the air of the microorganisms. 13) is configured to be discharged to the outside through the disposal,

In the middle of the sludge external discharge pipeline 13, the sludge inner conveying pipeline 14 for the internal conveyance of the sludge to the pre-reaction tank 4, which is the most important configuration in the present invention, is a three-way valve. ) Is connected to the pre-reactor (4) by closing the sludge external discharge pipe line (13) by operating the valve so that the flow path of the flow path switching valve (15) is opened to the pre-reactor (4). If the external discharge waste of sludge is needed, the valve is operated so that the flow path of the flow path switching valve 15 is opened with the sludge external discharge pipeline 13 so that only a part of the sludge is discharged externally and discarded. Recycling by repeated transport to the pre-reactor 4 increases the efficiency of wastewater and wastewater treatment by increasing the contact of microorganisms and sewage organics.

Under the intermittent long-term aeration type, the internal transport of the sludge from the main reaction tank (2) of the wastewater treatment system to the pre-reactor (4) was discharged to the outside, so that various microorganisms of the sludge increased contact time with organic matter in the sewage. It is an invention that improves the efficiency of sewage and wastewater treatment because it improves the removal efficiency of organic matter, nitrogen and phosphorus.

Claims (1)

In the wastewater treatment apparatus, the wastewater is aerated by mixing the wastewater with air by the air supply valve (5) in the pre-reactor (4) and the main reactor (2) and purified by organic decomposition of microorganisms. The sludge of the main reaction tank (2) is conveyed internally to the pre-reactor (4) through the sludge pump (12), the flow path switching valve (15), and the sludge inner conveying pipeline (14), and the sludge is recycled by the repeated transport of microorganisms. Internal transport type intermittent long-term aeration type sewage and wastewater treatment system with improved performance of sewage and wastewater treatment.